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Flexible,Porous,and Metal–Heteroatom?Doped Carbon Nanofibers as Efficient ORR Electrocatalysts for Zn–Air Battery
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作者 Qijian Niu Binling Chen +3 位作者 Junxia Guo Jun Nie Xindong Guo Guiping Ma 《纳微快报:英文版》 CAS CSCD 2019年第1期147-163,共17页
Developing an e cient and durable oxygen reduction electrocatalyst is critical for clean-energy technology, such as fuel cells and metal–air batteries. In this study, we developed a facile strategy for the preparatio... Developing an e cient and durable oxygen reduction electrocatalyst is critical for clean-energy technology, such as fuel cells and metal–air batteries. In this study, we developed a facile strategy for the preparation of flexible, porous, and well-dispersed metal–heteroatom-doped carbon nanofibers by direct carbonization of electrospun Zn/Co-ZIFs/PAN nanofibers(Zn/Co-ZIFs/PAN). The obtained Zn/Co and N co-doped porous carbon nanofibers carbonized at 800 °C(Zn/Co–N@PCNFs-800) presented a good flexibility, a continuous porous structure, and a superior oxygen reduction reaction(ORR) catalytic activity to that of commercial 20 wt% Pt/C, in terms of its onset potential(0.98 V vs. RHE), half-wave potential(0.89 V vs. RHE), and limiting current density(-5.26 mA cm-2). In addition, we tested the suitability and durability of Zn/Co–N@PCNFs-800 as the oxygen cathode for a rechargeable Zn–air battery. The prepared Zn–air batteries exhibited a higher power density(83.5 mW cm-2), a higher specific capacity(640.3 mAh g-1), an excellent reversibility, and a better cycling life than the commercial 20 wt% Pt/C + RuO2 catalysts. This design strategy of flexible porous non-precious metal-doped ORR electrocatalysts obtained from electrospun ZIFs/polymer nanofibers could be extended to fabricate other novel, stable, and easy-to-use multi-functional electrocatalysts for clean-energy technology. 展开更多
关键词 Electrospinning Zn/Co-ZIFs Carbon nanofibers FLEXIBLE POROUS structure ORR Znair battery
Bimetallic Nickel Cobalt Sulfide as E cient Electrocatalyst for Zn–Air Battery and Water Splitting
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作者 Jingyan Zhang Xiaowan Bai +5 位作者 Tongtong Wang Wen Xiao Pinxian Xi Jinlan Wang Daqiang Gao John Wang 《纳微快报:英文版》 CAS CSCD 2019年第1期33-45,共13页
The development of e cient earth-abundant electrocatalysts for oxygen reduction, oxygen evolution, and hydrogen evolution reactions(ORR, OER, and HER) is important for future energy conversion and energy storage devic... The development of e cient earth-abundant electrocatalysts for oxygen reduction, oxygen evolution, and hydrogen evolution reactions(ORR, OER, and HER) is important for future energy conversion and energy storage devices, for which both rechargeable Zn–air batteries and water splitting have raised great expectations. Herein, we report a single-phase bimetallic nickel cobalt sulfide((Ni,Co)S2) as an e cient electrocatalyst for both OER and ORR. Owing to the synergistic combination of Ni and Co, the(Ni,Co)S2 exhibits superior electrocatalytic performance for ORR, OER, and HER in an alkaline electrolyte, and the first principle calculation results indicate that the reaction of an adsorbed O atom with a H2O molecule to form a *OOH is the potential limiting step in the OER. Importantly, it could be utilized as an advanced air electrode material in Zn–air batteries, which shows an enhanced charge–discharge performance(charging voltage of 1.71 V and discharge voltage of 1.26 V at 2 mA cm-2), large specific capacity(842 mAh gZn-1 at 5 mA cm-2), and excellent cycling stability(480 h). Interestingly, the(Ni,Co)S2-based Zn–air battery can e ciently power an electrochemical water-splitting unit with(Ni,Co)S2 serving as both the electrodes. This reveals that the prepared(Ni,Co)S2 has promising applications in future energy conversion and energy storage devices. 展开更多
关键词 (Ni Co)S2 NANOSHEET arrays DFT calculations Znair batteries Water SPLITTING
In Situ Coupling Strategy for Anchoring Monodisperse Co9S8 Nanoparticles on S and N Dual?Doped Graphene as a Bifunctional Electrocatalyst for Rechargeable Zn–Air Battery
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作者 Qi Shao Jiaqi Liu +4 位作者 Qiong Wu Qiang Li Heng-guo Wang Yanhui Li Qian Duan 《纳微快报:英文版》 CAS CSCD 2019年第1期64-77,共14页
An in situ coupling strategy to prepare Co9S8/S and N dual?doped graphene composite(Co9S8/NSG) has been proposed. The key point of this strategy is the function?oriented design of organic compounds. Herein, cobalt por... An in situ coupling strategy to prepare Co9S8/S and N dual?doped graphene composite(Co9S8/NSG) has been proposed. The key point of this strategy is the function?oriented design of organic compounds. Herein, cobalt porphyrin derivatives with sulfo groups are employed as not only the coupling agents to form and anchor Co9S8 on the graphene in situ, but also the heteroatom?doped agent to generate S and N dual?doped graphene. The tight coupling of multiple active sites endows the composite materials with fast electrochemical kinetics and excellent stability for both oxygen reduction reaction(ORR) and oxygen evolution reaction(OER). The obtained electrocatalyst exhibits better activity parameter(ΔE = 0.82 V) and smaller Tafel slope(47.7 mV dec-1 for ORR and 69.2 mV dec-1 for OER) than commercially available Pt/C and RuO2. Most importantly, as electrocatalyst for rechargeable Zn–air battery, Co9S8/NSG displays low charge–discharge voltage gap and outstanding long?term cycle stability over 138 h compared to Pt/C–RuO2. To further broaden its application scope, a homemade all?solid?state Zn–air battery is also prepared, which displays good charge–discharge performance and cycle performance. The function?oriented design of N4?metallomacrocycle derivatives might open new avenues to strategic construction of high?performance and long?life multifunctional electrocatalysts for wider electro?chemical energy applications. 展开更多
关键词 In situ COUPLING strategy Porphyrin derivate DOPED GRAPHENE Metal sulfide BIFUNCTIONAL ELECTROCATALYST RECHARGEABLE Znair battery
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