Self-Powered Water-Splitting Devices by Core-Shell NiFe@N-Graphite-Based Zn-Air Batteries
Self-Powered Water-Splitting Devices by Core-Shell NiFe@N-Graphite-Based Zn-Air Batteries
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核壳型NiFe@N-石墨锌空气电池自供电水分解装置
DOI：
10.1002/adfm.201706928
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发表时间：
2018-04-05
影响因子：
19
通讯作者：
Wang, John
中科院分区：
文献类型：
--
作者：
Liu, Peitao;Gao, Daqiang;Wang, John
开发用于析氧反应（OER）、氧还原反应（ORR）和析氢反应的高效且低成本的多功能电催化剂对于能量存储和转换应用（例如在锌-空气电池和水裂解中）是迫切需要的，以替代非常昂贵的贵金属催化剂。本文报道了一种新型的核壳结构NiFe@ N-石墨电催化剂，该催化剂具有良好的电催化活性和对OER和ORR的稳定性，并将其用作锌-空气电池的空气电极。相应的液体Zn-空气电池显示出1.482 V的大开路电位和在10 mA cm（-2）下0.12 V的小充放电电压间隙，以及即使在20 mA cm（-2）下40 h后也具有优异的循环稳定性。有趣的是，由此得到的全固体状Zn-空气电池显示出高度期望的机械柔性，由此当弯曲成不同角度时观察到电压几乎没有变化。采用相同的Ni_（0.5）Fe_（0.5）@ N-石墨电极，构建了由两个锌-空气电池串联供电的自驱动水裂解装置。本研究为合理设计用于电化学催化剂和可再生能源应用的核-壳结构金属@ N-石墨基催化剂提供了新的机会。
Development of highly efficient and low-cost multifunctional electrocatalysts for the oxygen evolution reaction (OER), the oxygen reduction reaction (ORR), and the hydrogen evolution reaction is urgently required for energy storage and conversion applications, such as in Zn-air batteries and water splitting to replace very expansive noble metal catalysts. Here, the new core-shell NiFe@ N-graphite electrocatalysts with excellent electrocatalytic activity and stability toward OER and ORR are reported and the Ni0.5Fe0.5@ N-graphite electrocatalyst is applied as the air electrode in Zn-air batteries. The respective liquid Zn-air battery shows a large open-circuit potential of 1.482 V and a small charge-discharge voltage gap of 0.12 V at 10 mA cm(-2), together with excellent cycling stability even after 40 h at 20 mA cm(-2). Interestingly, the all-solid-like Zn-air battery thus derived shows a highly desired mechanical flexibility, whereby little change is observed in the voltage when bent into different angles. Using the same Ni0.5Fe0.5@ N-graphite electrode, a self-driven water-splitting device, which is powered by two Zn-air batteries in-series, is constructed. The present study opens a new opportunity for the rational design of metal@N-graphite-based catalysts of core-shell structures for electrochemical catalysts and renewable energy applications.