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有机膦酸盐衍生的氮掺杂的磷酸钴/碳纳米管杂化材料作为高效氧还原电催化剂 预览
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作者 赵挥 翁晨晨 +3 位作者 任金涛 葛丽 刘玉萍 袁忠勇 《催化学报》 SCIE EI CAS CSCD 北大核心 2020年第2期259-267,共9页
随着环境污染和能源危机的日益严重,探索高效的非贵金属氧还原电催化剂来替代商业Pt/C迫在眉睫.其中,报道比较多的是具有钴基活性物种和氮掺杂碳的复合材料例如Co-Nx-C, Co3O4/GO, Co-N/CNT等,该复合材料具有高导电性、良好的稳定性和... 随着环境污染和能源危机的日益严重,探索高效的非贵金属氧还原电催化剂来替代商业Pt/C迫在眉睫.其中,报道比较多的是具有钴基活性物种和氮掺杂碳的复合材料例如Co-Nx-C, Co3O4/GO, Co-N/CNT等,该复合材料具有高导电性、良好的稳定性和优异的催化活性.与其他钴基催化剂相比,磷酸钴由于其成本低廉,对环境友好,多功能的优良特性,已被广泛应用于催化、吸附、分离及储能等领域,在电催化方面也有极大的应用潜力.研究表明,磷酸基团不仅可以充当质子受体,也会诱导局部钴原子的几何结构发生扭曲,从而有利于水分子的吸附并促进析氧反应的发生.此外,磷酸钴也被证实具有一定的氧还原活性.尽管磷酸钴电催化剂的研究已经取得了一定进展,磷酸根有利于质子传输,但是其导电性很差,不利于电荷的转移和传输,使得其电催化活性不高.将磷酸钴和导电碳材料复合是解决问题的有效方法.而且,磷酸钴在碱性溶液中并不稳定,极大限制了其在电催化氧还原中的应用.金属有机膦酸盐是一类包含金属离子和有机膦酸配体的杂化材料,通过简单的焙烧便可以很容易地得到金属无机磷酸盐,并且在焙烧过程中氮掺杂的碳也会原位产生,并包覆在磷酸钴的表面,使得其导电性和催化活性大大提高.为此,本研究组制备了有机膦酸钴衍生的磷酸钴和氮磷掺杂的石墨烯的复合材料并用于电催化氧还原和析氧反应,所得到的材料导电性和稳定性良好,然而,该催化剂的表观活性与商业Pt/C相比仍有较大差距,且使用有机膦酸钴作为前驱体对活性的影响也不甚清楚.因此,本文采用含氮的有机膦酸配体乙二胺四亚甲基膦酸钠(EDTMPS)为磷源制备了氮掺杂的磷酸钴/碳纳米管杂化材料(CoPiC-N/CNT-3),其催化活性和稳定性良好,并进一步探讨了各种不同因素对电催化活性的影响.XRD和TEM结果表明,用这种 展开更多
关键词 金属膦酸盐 金属磷酸盐 碳纳米管 氧还原反应 电催化剂
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铁/氮共掺杂石墨烯的制备及氧还原催化活性 预览
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作者 朱广彬 边志成 +4 位作者 何雨林 李前进 郭路路 罗志虹 罗鲲 《材料导报》 EI CAS CSCD 北大核心 2020年第2期2010-2016,共7页
为提高直接甲醇燃料电池(DMFC)的氧还原反应动力学,减少商用Pt/C催化剂的使用,本工作提出将铁/氮共掺杂石墨烯(Fe/NG)作为DMFC的氧还原催化剂,并研究了Fe/NG的制备方法和催化活性。首先,通过水热法处理吸附有铁离子的聚苯胺/氧化石墨烯... 为提高直接甲醇燃料电池(DMFC)的氧还原反应动力学,减少商用Pt/C催化剂的使用,本工作提出将铁/氮共掺杂石墨烯(Fe/NG)作为DMFC的氧还原催化剂,并研究了Fe/NG的制备方法和催化活性。首先,通过水热法处理吸附有铁离子的聚苯胺/氧化石墨烯,并分别在700℃、800℃和900℃对其进行热处理,得到Fe/NG-700、Fe/NG-800和Fe/NG-900三种催化剂。然后,采用X射线衍射(XRD)和X射线光电子能谱(XPS)对三种Fe/NG催化剂进行表征,确定了铁元素以铁单质和四氧化三铁两种形式存在,氮元素以吡啶氮和石墨氮为主。最后,在氧饱和的0.1 mol/L KOH碱性体系中,采用循环伏安法(CV)、旋转圆盘电极(RDE)、旋转环盘电极(RRDE)研究了三种Fe/NG催化剂的ORR催化机理,证明Fe/NG-700、Fe/NG-800、Fe/NG-900催化四电子过程中,双氧水产率保持接近0。Fe/NG-700、Fe/NG-800、Fe/NG-900具有与20%Pt/C相当的催化活性和循环稳定性,更优异的抗甲醇毒化能力,是一种潜在的直接甲醇燃料电池催化剂。 展开更多
关键词 氧还原反应 铁/氮共掺杂石墨烯 四电子过程 稳定性 耐甲醇毒化
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掺杂碳封装的Fe/Co基纳米颗粒氧还原催化剂(英文)
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作者 倪保霞 武鲁明 +2 位作者 陈睿 史成香 陈铁红 《中国科学:材料科学(英文版)》 CSCD 2019年第11期1626-1641,共16页
氧还原反应是电化学能量转换和存储装置的重要反应过程,但其反应动力学缓慢,因此开发高效低成本的氧还原催化剂至关重要.目前,包裹过渡金属基纳米颗粒的碳材料因其优异的氧还原催化活性,引起了广泛关注.本文按照金属基纳米颗粒的类别从... 氧还原反应是电化学能量转换和存储装置的重要反应过程,但其反应动力学缓慢,因此开发高效低成本的氧还原催化剂至关重要.目前,包裹过渡金属基纳米颗粒的碳材料因其优异的氧还原催化活性,引起了广泛关注.本文按照金属基纳米颗粒的类别从金属、碳化物、磷化物、氧化物、硫化物以及混合颗粒等六个方面综述了掺杂碳封装的Fe/Co基纳米颗粒氧还原催化剂.催化剂碳基质的结构、纳米颗粒的种类及其分布对催化性能有很大影响,目前这类催化剂在碱性介质中表现出了优异的氧还原活性和稳定性,但在酸性介质中的活性仍需要进一步提高.文章讨论了制备封装型纳米颗粒/碳高效氧还原催化剂过程中存在的挑战,并展望了其发展前景. 展开更多
关键词 Fe/Co based NANOPARTICLES ENCAPSULATION carbon OXYGEN REDUCTION REACTION
钴/氮共掺杂多孔类石墨烯催化剂的制备及其高效氧还原性能表征
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作者 刘磊 张建 +1 位作者 麻伍军 黄云辉 《中国科学:材料科学(英文版)》 CSCD 2019年第3期359-367,共9页
本文通过纳米硅作为保护层结合高温热解得到一种新型钴/氮共掺杂多孔类石墨烯纳米碳材料氧还原催化剂(Co/N-GLC).结果显示, Co/N-GLC具有类似于石墨烯的碳纳米薄层结构,并展现出分级多孔(微孔/介孔)特性,其比表面积高达809 m2g-1;此外, ... 本文通过纳米硅作为保护层结合高温热解得到一种新型钴/氮共掺杂多孔类石墨烯纳米碳材料氧还原催化剂(Co/N-GLC).结果显示, Co/N-GLC具有类似于石墨烯的碳纳米薄层结构,并展现出分级多孔(微孔/介孔)特性,其比表面积高达809 m2g-1;此外, Co/N-GLC还拥有较高的吡啶氮和石墨氮含量.这些优异的特性使得Co/N-GLC在碱性介质中具有出色的氧还原活性,接近于商业Pt/C催化剂.同时,在锌空气电池测试中, Co/N-GLC具有接近Pt/C电极的放电性能和优异的稳定性,表明该催化剂有望替代贵金属催化剂,具有很好的应用前景. 展开更多
关键词 graphene-like NANOCARBON OXYGEN reduction reaction ELECTROCATALYST zinc-air BATTERY
An efficient bifunctional electrocatalyst derived from layer-by-layer self-assembly of a three-dimensional porous Co-N-C@graphene
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作者 Shichang Cai Rui Wang +3 位作者 William M. Yourey Junsheng Li Haining Zhang Haolin Tang 《科学通报:英文版》 SCIE EI CSCD 2019年第14期968-975,共8页
Three-dimensional (3D) porous carbon-based materials with tunable composition and microstructure are of great interest for the development of oxygen involved electrocatalytic reactions. Here, we report the synthesis o... Three-dimensional (3D) porous carbon-based materials with tunable composition and microstructure are of great interest for the development of oxygen involved electrocatalytic reactions. Here, we report the synthesis of 3D porous carbon-based electrocatalyst by self-assembling Co-metal organic frameworks (MOF) building blocks on graphene via a layer-by-layer technique. Precise control of the structure and morphology is achieved by varying the MOF layer to tune the electrocatalytic properties. The as-produced electrocatalyst exhibits an excellent catalytic activity for the oxygen reduction reaction in 0.1molL^-1 KOH, showing a high onset potential of 0.963V vs. reversible hydrogen electrode (RHE) and a low tafel slope of 54mVdec^-1, compared to Pt/C (0.934V and 52mVdec^-1, respectively). Additionally, it shows a slightly lower potential vs. RHE (1.72V) than RuO2 (1.75V) at 10mAcm^-2 in an alkaline electrolyte. A rechargeable Zn-air battery based on the as-produced 3D porous catalyst demonstrates a high peak power density of 119mWcm^-2 at a cell voltage of 0.578V while retaining an excellent stability over 250 charge-discharge cycles. 展开更多
关键词 OXYGEN reduction REACTION Cobalt THREE-DIMENSIONAL OXYGEN evolution REACTION GRAPHENE
可充电锌空气电池的双功能电催化剂 预览
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作者 郭一博 陈亚楠 +1 位作者 崔会娟 周震 《催化学报》 SCIE EI CAS CSCD 北大核心 2019年第9期1298-1310,共13页
随着人类社会的发展,对能源的需求急剧增长,能源的过度消耗已经给人类敲响了警钟,可持续发展进入人们的视野,并迅速成为现代社会关注的焦点.众多的研究在绿色和可持续能源开发方面作出了巨大努力,极大地推动了电化学储能和转换技术的进... 随着人类社会的发展,对能源的需求急剧增长,能源的过度消耗已经给人类敲响了警钟,可持续发展进入人们的视野,并迅速成为现代社会关注的焦点.众多的研究在绿色和可持续能源开发方面作出了巨大努力,极大地推动了电化学储能和转换技术的进步.目前,锂离子电池正在引领着能量存储领域.然而,可充电锂离子电池的能量密度不足,限制了它们进一步的应用和发展.金属空气电池的理论能量密度是最先进锂离子电池的几倍,使其成为锂离子电池良好的替代品.根据负极金属的种类,金属空气电池可分为几种不同类型,其中锂空气电池和锌空气电池是最具有潜力的金属空气电池.但是,锂空气电池存在一些缺点和潜在的危险,例如锂金属成本相对较高且化学性质十分活泼,有机电解质十分易燃.这些问题阻碍了未来锂空气电池的商业化进程和大规模应用.锌空气电池因具有能量密度高、安全性好、成本低和环保等特性而备受关注.但是,由于锌空气电池的可充电性能较差,实现其实际应用仍然是一个巨大的挑战.阻碍其发展的最大障碍是空气正极上固有的缓慢的反应动力学过程,包括放电过程中的氧还原反应和充电过程中的氧析出反应.寻找廉价高效的双功能氧电催化剂来取代传统的单功能贵金属催化剂是解决这些问题的关键.在这篇综述中,首先简要介绍了锌空气电池的结构和空气电极上基本的电化学反应.然后,详细介绍了最新的用于锌空气电池的双功能氧电催化剂,并将其分为无金属催化剂和金属催化剂两大类.对于不含金属的双功能催化剂,杂原子掺杂碳材料是研究重点,这是由于它们具有较高的催化活性、稳定性和低成本等特点.对于金属基双功能催化剂,根据其组成和制备分为三类:金属和碳/氮杂化材料;金属氧化物和碳杂化材料;MOF衍生材料.其中,过渡金属氧 展开更多
关键词 双功能电催化剂 氧还原反应 氧析出反应 锌空气电池 杂化材料
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立方相碳化钛在锂空电池中的电化学行为 预览
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作者 秦振海 黄昊 +3 位作者 吴爱民 陈明珠 杨影影 姚曼 《材料工程》 EI CAS CSCD 北大核心 2019年第2期34-41,共8页
采用直流电弧等离子体法在甲烷和氩气混合气氛下原位合成碳化钛(TiC)纳米颗粒。X射线衍射、透射电子显微镜等物理表征结果显示TC纳米颗粒粒径约为40~90nm的立方体结构。循环伏安(CV)测试表明,TC纳米颗粒兼具高效的氧还原和氧析出双效催... 采用直流电弧等离子体法在甲烷和氩气混合气氛下原位合成碳化钛(TiC)纳米颗粒。X射线衍射、透射电子显微镜等物理表征结果显示TC纳米颗粒粒径约为40~90nm的立方体结构。循环伏安(CV)测试表明,TC纳米颗粒兼具高效的氧还原和氧析出双效催化活性,可有效弥补炭材料氧析出催化活性较弱的缺陷。恒流充放电测试结果表明,相对于普通炭材料(导电炭黑,Super-P),TiC纳米颗粒催化剂可将锂空电池充电过电势降低280mV;在电流密度(&)为50mA·g^-1时,首次放电比容量达1267mAh·g^-1;即使在较高的电流密度150mA·g^-1下,比容量仍保持在778mAh·g^-1,体现了良好的倍率性能。在电流密度为100mA·g^-1、限定比容量为500mAh·g^-1下,稳定循环10次。通过XRD、红外、扫描电镜表征可知,在TC纳米颗粒的双效催化作用下,Li2O2的生成与分解具有良好的可逆性,有效避免了大量反应副产物积累的问题,进而提高锂空电池的电化学性能。 展开更多
关键词 锂空电池 碳化钛纳米颗粒 氧还原反应 氧析出反应 过电势
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Metal-organic framework based nanomaterials for electrocatalytic oxygen redox reaction
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作者 Kexin Zhang Wenhan Guo +1 位作者 Zibin Liang Ruqiang Zou 《中国科学:化学英文版》 SCIE EI CAS CSCD 2019年第4期417-429,共13页
Due to the severe environmental issues,many advanced technologies,typically fuel cells and metal-air batteries have aroused widespread concerns and been intensively studied in recent years.However,oxygen redox reactio... Due to the severe environmental issues,many advanced technologies,typically fuel cells and metal-air batteries have aroused widespread concerns and been intensively studied in recent years.However,oxygen redox reactions including oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)as the core reactions suffer from sluggish kinetics of the multiple electron transfer process.Currently,Pt,RuO2,and IrO2 are considered to be the benchmark catalysts for ORR and OER,but their high price,scarcity and instability hinder them from large-scale application.To overcome these limits,exploring alternative electrocatalysts with low cost,high activity,long-term stability,and earth-abundance is of extreme urgency.Metal-organic frameworks(MOFs)are a family of inorganic-organic hybrid materials with high surface areas and tunable structures,making them proper as catalyst candidates.Herein,the recent progress of MOFs and MOF-derived materials for ORR and OER is systematically reviewed,and the relationship between compositions and electrochemical performance is discussed.It is expected that this review can be helpful for the future development of related MOF-based materials with excellent electrochemical performance. 展开更多
关键词 METAL-ORGANIC frameworks OXYGEN evolution REACTION OXYGEN reduction REACTION earth-abundant materials ELECTROCATALYSIS NANOMATERIALS
Controllable active sites and facile synthesis of cobalt nanoparticle embedded in nitrogen and sulfur co-doped carbon nanotubes as efficient bifunctional electrocatalysts for oxygen reduction and evolution reactions 预览
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作者 Taeseob Oh Kwanwoo Kim Jooheon Kim 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第11期60-67,共8页
Development of efficient and promising bifunctional electrocatalysts for oxygen reduction and evolutionreactions is desirable. Herein, cobalt nanoparticles embedded in nitrogen and sulfur co-doped carbonnanotubes(Co@N... Development of efficient and promising bifunctional electrocatalysts for oxygen reduction and evolutionreactions is desirable. Herein, cobalt nanoparticles embedded in nitrogen and sulfur co-doped carbonnanotubes(Co@NSCNT) were prepared by a facile pyrolytic treatment. The cobalt nanoparticles and co-doping of nitrogen and sulfur can improve the electron donor-acceptor characteristics of the carbon nan-otubes and provide more active sites for catalytic oxygen reduction and evolution reactions. The preparedCo@NSCNT, annealed at 900℃, showed excellent electrocatalytic performance and better durability thancommercial platinum catalysts. Additionally, Co@NSCNT-900 catalysts exhibited comparable onset poten-tials and Tafel slopes to ruthenium oxide. Overall, Co@NSCNT showed high activity and improved dura-bility for both oxygen evolution and reduction reactions. 展开更多
关键词 Oxygen reduction reaction Oxygen evolution reaction Nonprecious metal catalyst Nitrogen and sulfur co-doping Encapsulated structure
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MOF衍生N-CoFe-C@NF多级结构用于可充放锌-空气电池
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作者 施可飞 杨皓景 +1 位作者 连跃彬 彭扬 《科学通报》 EI CAS CSCD 北大核心 2019年第32期3378-3384,共7页
锌-空气电池作为一种兼具成本低、容量高、环境友好等优点的高效储能器件,具有1084 Wh/kg的理论能量密度,甚至高于传统锂离子电池.锌-空气电池主要受限于其空气电极材料氧还原(ORR)和析氧反应(OER)缓慢的动力学,因此大量的研究都集中在... 锌-空气电池作为一种兼具成本低、容量高、环境友好等优点的高效储能器件,具有1084 Wh/kg的理论能量密度,甚至高于传统锂离子电池.锌-空气电池主要受限于其空气电极材料氧还原(ORR)和析氧反应(OER)缓慢的动力学,因此大量的研究都集中在如何优化其催化活性上.目前应用最广泛的ORR和OER的催化剂分别是Pt/C和RuO2,但是其高昂的价格和稀缺性使其应用受限.金属有机框架(MOF)是金属阳离子或阳离子团簇与有机配体配位形成的配位聚合物,具有高比表面积与结构可调控性等优势,经高温煅烧后可以获得结构各异且异原子掺杂(例如氮掺杂)的碳化物材料,展现了优良的ORR和OER催化活性,成为电催化领域的研究热点.类普鲁士蓝是一种典型的MOF材料,具有成分易调控、合成方法简单等优点.本研究通过氢氧化钴纳米棒的原位转化制备负载在泡沫镍上的钴铁双金属类普鲁士蓝,并以此为前驱体制备了氮掺杂钴铁双金属碳化物催化剂;使用扫描电子显微镜(SEM)、X光衍射(XRD)、X光电子能谱(XPS)等手段对样品进行表征;使用旋转圆盘电极、线扫描等测试材料研究其对ORR和OER催化性能的影响.结果表明,所制备的氮掺杂钴铁双金属碳化物催化剂具备较好的ORR和OER活性.在0.1 mol/L KOH溶液中,ORR半波电位为0.81 V;1.0 mol/L KOH中,OER电流密度达到10 mA/cm^2时,过电位为300 mV.该材料作为空气电极催化剂组装锌-空气电池,开路电压为1.29 V,且具备较好的稳定性和循环性. 展开更多
关键词 类普鲁士蓝 氮掺杂金属碳化物 氧还原反应 析氧反应 锌-空气电池
锌空气电池中电催化剂与电池结构设计研究进展 预览
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作者 吴明在 吴玉东 +2 位作者 曹志钱 蒋童童 胡海波 《安徽大学学报:自然科学版》 CAS 北大核心 2019年第5期1-10,共10页
锌空气电池(ZABs)的理论能量密度高达1086Wh·kg^-1,具有原料丰富、环境友好、成本低及安全性高等优点.该文介绍锌空气电池的基本原理、关键问题、研究进展及面临的挑战,围绕锌空气电池的组成部分详细讨论,主要内容包括空气阴极双... 锌空气电池(ZABs)的理论能量密度高达1086Wh·kg^-1,具有原料丰富、环境友好、成本低及安全性高等优点.该文介绍锌空气电池的基本原理、关键问题、研究进展及面临的挑战,围绕锌空气电池的组成部分详细讨论,主要内容包括空气阴极双功能电催化剂和电池结构设计.最后,以锌空气电池的应用为目标,展望其未来的应用前景. 展开更多
关键词 锌空气电池 氧还原反应 氧析出反应 电催化剂 电池结构
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Rechargeable Zn-air batteries initiated by nickel–cobalt bimetallic selenide 预览
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作者 Changqi Sun Xiaosong Guo +3 位作者 Jingyan Zhang Genliang Han Daqiang Gao Xiaoping Gao 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第11期34-40,共7页
A Zn-air battery is a potential next-generation energy storage device owing to its extremely high theoretical energy density. Currently, it is important to explore non-precious metal electrocatalysts with high electro... A Zn-air battery is a potential next-generation energy storage device owing to its extremely high theoretical energy density. Currently, it is important to explore non-precious metal electrocatalysts with high electroactivity and stability in the oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) for the development of Zn-air batteries. In this work, porous(Ni,Co)Se2 nanosheets were synthesized by selenizing Ni Co2O4 nanosheets. By regulating the conductivity and morphology of the sample, the prepared porous(Ni,Co)Se2 nanosheets show enhanced electrocatalytic activity for OER and ORR compared to Ni Co2O4 nanosheets. The aqueous Zn-air battery using porous(Ni,Co)Se2 nanosheets as the air cathode exhibits superior charge and discharge performance(1.98 V for charging and 1.17 V for discharging), high specific capacity(770 m Ah/g), and excellent cycle stability(140 h). These results indicate that the porous(Ni,Co)Se2 nanosheets are suitable as a bifunctional electrocatalyst for future Zn-air batteries. 展开更多
关键词 ELECTROCATALYST Zn-air batteries Oxygen evolution reaction Oxygen reduction reaction
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LaNiO3 modified with Ag nanoparticles as an efficient bifunctional electrocatalyst for rechargeable zinc-air batteries
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作者 Pengzhang Chuanjin TIAN +2 位作者 Wei YANG Wenyan ZHAO Zhe LU 《材料科学前沿:英文版》 SCIE CSCD 2019年第3期277-287,共11页
No-precious bifunctional catalysts with high electrochemical activities and stability were crucial to properties of rechargeable zinc-air batteries.Herein,LaNiO3 modified with Ag nanoparticles(Ag/LaNiO3)was prepared b... No-precious bifunctional catalysts with high electrochemical activities and stability were crucial to properties of rechargeable zinc-air batteries.Herein,LaNiO3 modified with Ag nanoparticles(Ag/LaNiO3)was prepared by the co-synthesis method and evaluated as the bifunctional oxygen catalyst for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).Compared with LaNiO3,Ag/LaNiO3 demonstrated the enhanced catalytic activity towards ORR/OER as well as higher limited current density and lower onset potential.Moreover,the potential gap between ORR potential(at-3 mA cm^-2)and OER potential(at 5 mA cm^-2)was 1.16 V.The maximum power density of the primary zinc-air battery with Ag/LaNiO3 catalyst achieved 60 mW cm^-2.Furthermore,rechargeable zinc-air batteries operated reversible charge-discharge cycles for 150 cycles without noticeable performance deterioration,which showed its excellent bifunctional activity and cycling stability as oxygen electrocatalyst for rechargeable zinc-air batteries.These results indicated that Ag/LaNiO3 prepared by the co-synthesis method was a promising bifunctional catalyst for rechargeable zinc-air batteries. 展开更多
关键词 Ag/LaNiO3 co-synthesis method oxygen reduction reaction oxygen evolution reaction rechargeable zinc-air battery
Hollow cobalt oxide nanoparticles embedded in nitrogen-doped carbon nanosheets as an efficient bifunctional catalyst for Zn–air battery 预览
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作者 Yuhui Tian Li Xu +6 位作者 Jian Bao Junchao Qian Huaneng Su Huaming Li Haidong Gu Cheng Yan Henan Li 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第6期59-66,共8页
Rational design of low-cost, highly electrocatalytic activity, and stable bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) has been a great significant for metal–air... Rational design of low-cost, highly electrocatalytic activity, and stable bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) has been a great significant for metal–air batteries. Herein, an efficient bifunctional electrocatalyst based on hollow cobalt oxide nanoparticles embedded in nitrogen-doped carbon nanosheets(Co/N-Pg) is fabricated for Zn–air batteries. A lowcost biomass peach gum, consisting of carbon, oxygen, and hydrogen without other heteroatoms, was used as carbon source to form carbon matrix hosting hollow cobalt oxide nanoparticles. Meanwhile, the melamine was applied as nitrogen source and template precursor, which can convert to carbon-based template graphitic carbon nitride by polycondensation process. Owing to the unique structure and synergistic effect between hollow cobalt oxide nanoparticles and Co-N-C species, the proposal Co/N-Pg catalyst displays not only prominent bifunctional electrocatalytic activities for ORR and OER, but also excellent durability. Remarkably, the assembled Zn–air battery with Co/N-Pg air electrode exhibited a low discharge-charge voltage gap(0.81 V at 50 mA cm^-2) and high peak power density(119 mW cm^-2) with long-term cycling stability. This work presents an effective approach for engineering transition metal oxides and nitrogen modified carbon nanosheets to boost the performance of bifunctional electrocatalysts for Zn–air battery. 展开更多
关键词 Zn-air batteries OXYGEN reduction REACTION OXYGEN evolution REACTION NITROGEN-DOPED carbon NANOSHEETS Cobalt oxides
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Redox catalysts for aprotic Li-O2 batteries: Toward a redox flow system 预览
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作者 YunGuang Zhu F.W.Thomas Goh Qing Wang 《纳米材料科学(英文版)》 CAS 2019年第3期173-183,共11页
Large-scale electrical energy storage with high energy density and round-trip efficiency is important to the resilience of power grids and the effective use of intermittent renewable energy such as solar and wind.Lith... Large-scale electrical energy storage with high energy density and round-trip efficiency is important to the resilience of power grids and the effective use of intermittent renewable energy such as solar and wind.Lithiumoxygen battery,due to its high energy density,is believed to be one of the most promising energy storage systems for the future.However,large overpotentials,poor cycling stability,and degradation of electrolytes and cathodes have been hindering the development of lithium-oxygen batteries.Numerous heterogeneous oxygen electrocatalysts have been investigated to lower the overpotentials and enhance the cycling stability of lithium-oxygen batteries.Unfortunately,the prevailing issues of electrode passivation and clogging remain.Over the past few years,redox mediators were explored as homogenous catalysts to address the issues,while only limited success has been achieved for these soluble catalysts.In conjunction with a flowing electrolyte system,a new redox flow lithium-oxygen battery(RFLOB)has been devised to tackle the aforementioned issues.The working mechanism and schematic processes will be elaborated in this review.In addition,the performance gap of RFLOB with respect to practical requirements will be analysed.With the above,we anticipate RFLOB would be a credible solution for the implementation of lithium-oxygen battery chemistry for the next generation energy storage. 展开更多
关键词 Lithium-air battery Redox catalysis Oxygen reduction reaction Oxygen evolution reaction Redox flow cell
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Advanced electrosynthesis of hydrogen peroxide on oxidized carbon electrocatalyst 预览
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作者 Chang-Xin Zhao Bo-Quan Li Qiang Zhang 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第7期10-11,共2页
Hydrogen peroxide(H2O2)is one of the 100 most important chemicals involved in multiple chemical processes including paper and textile manufacturing,waste degradation,and pharmaceutical production[1].Compared with the ... Hydrogen peroxide(H2O2)is one of the 100 most important chemicals involved in multiple chemical processes including paper and textile manufacturing,waste degradation,and pharmaceutical production[1].Compared with the current industrial process to produce H2O2 following the anthraquinone oxidation/reduction method,electrochemical reduction of oxygen to H2O2 through a two-electron pathway constitutes an environmental friendly alternative route[2-4].Unfortunately,the electrogeneration of H2O2 from two-electron reduction of oxygen feedstock is kinetically sluggish and therefore requires electrocatalysts with high reactivity,high selectivity,and good stability[5,6]. 展开更多
关键词 Hydrogen peroxide ELECTROSYNTHESIS OXYGEN reduction reaction CARBON nanotubes ELECTROCATALYSIS OXYGEN functional groups
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中温固体氧化物燃料电池复合阴极材料LaBiMn2O6-Sm0.2Ce0.8O1.9的制备与电化学性质 预览
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作者 于亚泽 孙丽萍 +1 位作者 赵辉 霍丽华 《无机化学学报》 SCIE CAS CSCD 北大核心 2019年第4期589-597,共9页
采用甘氨酸燃烧法合成了LaBiMn2O6粉体,并与Sm0.2Ce0.8O1.9均匀混合制备了LaBiMn2O6-Sm0.2Ce0.8O1.9(LBM-SDC)复合阴极材料。利用X射线衍射(XRD)和扫描电子显微镜(SEM)对材料的物相及微观形貌进行分析,结果表明LBM与SDC在1 000℃下有良... 采用甘氨酸燃烧法合成了LaBiMn2O6粉体,并与Sm0.2Ce0.8O1.9均匀混合制备了LaBiMn2O6-Sm0.2Ce0.8O1.9(LBM-SDC)复合阴极材料。利用X射线衍射(XRD)和扫描电子显微镜(SEM)对材料的物相及微观形貌进行分析,结果表明LBM与SDC在1 000℃下有良好的化学稳定性。SDC的复合增加了氧离子传导路径,进而使氧还原反应(ORR)速度加快。电化学阻抗谱(EIS)测试结果表明,复合阴极极化电阻(Rp)随SDC复合量的增加呈现先降低后升高的趋势,当复合量为30%(w/w)时,阴极材料的性能最优。在700℃空气气氛下的极化电阻为0.186Ω·cm2,相对LBM(0.717Ω·cm2)减少74%。氧分压测试结果表明阴极反应的速率控制步骤为氧分子的吸附-解离过程。以复合阴极构筑的电解质支撑单电池Ni-SDC/SDC/LBM-30%SDC在700℃的最大输出功率密度为234 mW·cm-2,连续测试90 h输出功率衰减约4%。 展开更多
关键词 中温固体氧化物燃料电池(IT-SOFCs) LaBiMn2O6-Sm0.2Ce0.8O1.9 复合阴极 电极反应 氧还原反应
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Facile synthesis strategy of NicorePtshell electrocatalyst for oxygen reduction reaction 预览
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作者 Yi Wang Gui-Fa Long +2 位作者 Jin-Hua Piao Zhi-Yong Fu Zhen-Xing Liang 《能源化学:英文版》 CSCD 2019年第10期192-196,共5页
Polymer electrolyte membrane fuel cells(PEMFCs), as an energy conversion technology, have attracted extensive attention due to their high conversion efficiency, low emission, high energy density,and fast fuel charging... Polymer electrolyte membrane fuel cells(PEMFCs), as an energy conversion technology, have attracted extensive attention due to their high conversion efficiency, low emission, high energy density,and fast fuel charging [1,2]. Pt-based catalysts have been acknowledged to be the most effective catalyst for the oxygen reduction reaction(ORR) [3–5]. However, both the source scarcity and high cost of Pt severely hinder the commercial application of the PEMFCs [1,6,7]. 展开更多
关键词 CORE-SHELL structure SPONTANEOUS DISPLACEMENT REACTION OXYGEN reduction REACTION Fuel cell
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Facile synthesis of Mo2C nanoparticles on N-doped carbon nanotubes with enhanced electrocatalytic activity for hydrogen evolution and oxygen reduction reactions 预览
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作者 Yue-Jun Song Jin-Tao Ren +3 位作者 Gege Yuan Yali Yao Xinying Liu Zhong-Yong Yuan 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第11期68-77,共10页
Developing low-cost and highly-efficient electrocatalysts for renewable energy conversion technologies has attracted even-increasing attention. Molybdenum carbide materials have recently emerged as a type of promising... Developing low-cost and highly-efficient electrocatalysts for renewable energy conversion technologies has attracted even-increasing attention. Molybdenum carbide materials have recently emerged as a type of promising catalysts for electrocatalytic reactions due to the earth-abundance and Pt-resembled electrical properties. In this work, taking the advantage of the interaction between the basic groups of the Mo(VI)-melamine polymer and the acidic groups on the surface of the oxidized carbon nanotubes(CNTs), N-doped CNTs supported Mo2C nanoparticles(Mo2C/NCNT) are prepared, which exhibit outstanding electrocatalytic activity and durability for both the hydrogen evolution and oxygen reduction reactions. The impressive performance of Mo2C/NCNT can be attributed to the small size of Mo2C particles, the large exposure ratio of surface sites and the presence of N-doped CNTs. This work enlarges the multi-field applications of molybdenum carbide-base materials as promising non-precious metal electrocatalysts, which is of great significance for sustainable energy-related technologies. 展开更多
关键词 N-DOPING Carbon nanotubes Molybdenum carbides Hydrogen evolution reaction Oxygen reduction reaction ELECTROCATALYSIS
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Cobalt and nitrogen codoped porous carbon as superior bifunctional electrocatalyst for oxygen reduction and hydrogen evolution reaction in alkaline medium
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作者 Xiaoxia Chen Xiangjun Zhen +6 位作者 Hongyu Gong Le Li Jianwei Xiao Zhi Xu Deyue Yan Guyu Xiao Ruizhi Yang 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第3期681-685,共5页
Cobalt and nitrogen codoped carbon materials(Co-N-C) were fabricated by pyrolysis of the mixture of poly(4-vinylpyridine) and cobalt chloride using SiO2 nanoparticles as hard template, which were the first transition ... Cobalt and nitrogen codoped carbon materials(Co-N-C) were fabricated by pyrolysis of the mixture of poly(4-vinylpyridine) and cobalt chloride using SiO2 nanoparticles as hard template, which were the first transition metal/nitrogen-codoped carbon bifunctional electrocatalyst derived from noncarbonizable polymer for ORR and HER. The as-made Co-N-C possessed hierarchical pore structure and high specific surface area, achieving excellent electrocatalytic performances for ORR and HER. Its ORR catalytic performances were comparable to those of Pt/C catalyst and its HER catalytic performances were superior to those of most doped carbon catalysts in KOH electrolyte. Moreover, its bifunctional electrocatalytic performances for ORR and HER were better than those of most bifunctional doped carbon catalysts in alkaline electrolyte. 展开更多
关键词 Carbon COBALT and NITROGEN Doped Oxygen reduction REACTION Hydrogen evolution REACTION
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