Liu Wenxian, Yu Linhai, Yin Ruilian, Xu Xilian, Feng Jinxiu, Jiang Xuan, Zheng Dong, Gao Xinlong, Gao Xiaobin, Que Wenbin, Ruan Pengchao, Wu Fangfang, Shi Wenhui, Cao Xiehong
College of Materials Science and Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, Zhejiang, P. R. China.
Center for Membrane Separation and Water Science & Technology, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, Zhejiang, P. R. China.
Small. 2020 Mar;16(10):e1906775. doi: 10.1002/smll.201906775. Epub 2020 Jan 29.
Portable water splitting devices driven by rechargeable metal-air batteries or solar cells are promising, however, their scalable usages are still hindered by lack of suitable multifunctional electrocatalysts. Here, a highly efficient multifunctional electrocatalyst is demonstrated, i.e., 2D nanosheet array of Mo-doped NiCo O /Co N heterostructure deposited on nickel foam (Mo-NiCo O /Co N/NF). The successful doping of non-3d high-valence metal into a heterostructured nanosheet array, which is directly grown on a conductive substrate endows the resultant catalyst with balanced electronic structure, highly exposed active sites, and binder-free electrode architecture. As a result, the Mo-NiCo O /Co N/NF exhibits remarkable catalytic activity toward the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), affording high current densities of 50 mA cm at low overpotentials of 310 mV for OER, and 170 mV for HER, respectively. Moreover, a low voltage of 1.56 V is achieved for the Mo-NiCo O /Co N/NF-based water splitting cell to reach 10 mA cm . More importantly, a portable overall water splitting device is demonstrated through the integration of a water-splitting cell and two Zn-air batteries (open-circuit voltage of 1.43 V), which are all fabricated based on Mo-NiCo O /Co N/NF, demonstrating a low-cost way to generate fuel energy. This work offers an effective strategy to develop high-performance metal-doped heterostructured electrode.
由可充电金属空气电池或太阳能电池驱动的便携式水分解装置很有前景，然而，缺乏合适的多功能电催化剂仍然阻碍了它们的规模化应用。在此，展示了一种高效的多功能电催化剂，即沉积在泡沫镍上的Mo掺杂NiCoO/CoN异质结构的二维纳米片阵列（Mo-NiCoO/CoN/NF）。将非3d高价金属成功掺杂到直接生长在导电基底上的异质结构纳米片阵列中，赋予了所得催化剂平衡的电子结构、高度暴露的活性位点和无粘结剂的电极结构。结果，Mo-NiCoO/CoN/NF对析氧反应（OER）和析氢反应（HER）表现出显著的催化活性，在OER低过电位310 mV和HER低过电位170 mV时分别提供50 mA cm的高电流密度。此外，基于Mo-NiCoO/CoN/NF的水分解电池在1.56 V的低电压下即可达到10 mA cm。更重要地，通过集成一个水分解电池和两个基于Mo-NiCoO/CoN/NF制备的锌空气电池（开路电压为1.43 V），展示了一种便携式全水分解装置，证明了一种低成本的产生燃料能源的方法。这项工作为开发高性能金属掺杂异质结构电极提供了一种有效策略。
