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Amorphous Bimetallic Oxide-Graphene Hybrids as Bifunctional Oxygen Electrocatalysts for Rechargeable Zn-Air Batteries

zhpd55 添加于 2017/8/16 17:37:51  1289次阅读 | 0次推荐 | 0个评论

Metal oxides of earth-abundant elements are promising electrocatalysts to overcome the sluggish oxygen evolution and oxygen reduction reaction (OER/ORR) in many electrochemical energy-conversion devices. However, it is difficult to control their catalytic activity precisely. Here, a general three-stage synthesis strategy is described to produce a family of hybrid materials comprising amorphous bimetallic oxide nanoparticles anchored on N-doped reduced graphene oxide with simultaneous control of nanoparticle elemental composition, size, and crystallinity. Amorphous Fe0.5Co0.5Ox is obtained from Prussian blue analog nanocrystals, showing excellent OER activity with a Tafel slope of 30.1 mV dec−1 and an overpotential of 257 mV for 10 mA cm−2 and superior ORR activity with a large limiting current density of −5.25 mA cm−2 at 0.6 V. A fabricated Zn–air battery delivers a specific capacity of 756 mA h gZn−1 (corresponding to an energy density of 904 W h kgZn−1), a peak power density of 86 mW cm−2 and can be cycled over 120 h at 10 mA cm−2. Other two amorphous bimetallic, Ni0.4Fe0.6Ox and Ni0.33Co0.67Ox, are also produced to demonstrate the general applicability of this method for synthesizing binary metal oxides with controllable structures as electrocatalysts for energy conversion.

作 者:Li Wei, H. Enis Karahan, Shengli Zhai, Hongwei Liu, Xuncai Chen, Zheng Zhou, Yaojie Lei, Zongwen Liu, Yuan Chen
期刊名称: Advanced Materials
期卷页: First published: 14 August 2017 第卷 第期 页
学科领域:化学科学 » 无机化学 » 应用无机化学
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原文链接:http://onlinelibrary.wiley.com/doi/10.1002/adma.201701410/abstract;jsessionid=9998D772C0DBD2FBD69F336375BB90A6.f02t02
DOI: 10.1002/adma.201701410
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备 注: Zinc-air batteries are batteries powered by zinc metal and oxygen from the air. Due to the global abundance of zinc metal, these batteries are much cheaper to produce than lithium-ion batteries, and they can also store more energy (theoretically five times more than that of lithium-ion batteries), are much safer and are more environmentally friendly. While zinc-air batteries are currently used as an energy source in hearing aids and some film cameras and railway signal devices, their widespread use has been hindered by the fact that, up until now, recharging them has proved difficult. This is due to the lack of electrocatalysts that successfully reduce and generate oxygen during the discharging and charging of a battery. Published in Advanced Materials today, a paper authored by chemical engineering researchers from the University of Sydney and Nanyang Technological University outlines a new three-stage method to overcome this problem.
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