用于增强电化学水分解的中空多孔异金属磷化物纳米立方体
Hollow Porous Heterometallic Phosphide Nanocubes for Enhanced Electrochemical Water Splitting.
作者信息
Guo Yanna, Tang Jing, Wang Zhongli, Sugahara Yoshiyuki, Yamauchi Yusuke
机构信息
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan.
出版信息
Small. 2018 Nov;14(44):e1802442. doi: 10.1002/smll.201802442. Epub 2018 Oct 4.
Highly efficient earth-abundant electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are of great importance for renewable energy conversion systems. Herein, hollow porous heterometallic phosphide nanocubes are developed as a highly active and robust catalyst for electrochemical water splitting via one-step phosphidation of a NiCoFe Prussian blue analogue. Through modulation of the composition of metals in the precursors, the optimal NiCoFeP exhibiting increased electrical conductivity and abundant electrochemically active sites, leading to high electrocatalytic activities and outstanding kinetics for both HER and OER, is successfully obtained. NiCoFeP shows low overpotentials of 273 mV for OER and 131 mV for HER at a current density of 10 mA cm and quite low Tafel slopes of 35 mV dec for OER and 56 mV dec for HER.
用于析氢反应（HER）和析氧反应（OER）的高效且地球上储量丰富的电催化剂对于可再生能源转换系统至关重要。在此，通过对镍钴铁普鲁士蓝类似物进行一步磷化处理，开发出空心多孔异金属磷化物纳米立方体作为用于电化学水分解的高活性且稳健的催化剂。通过调节前驱体中金属的组成，成功获得了具有提高的电导率和丰富电化学活性位点的最优NiCoFeP，从而导致其对HER和OER均具有高电催化活性和出色的动力学。在电流密度为10 mA cm时，NiCoFeP对OER的过电位低至273 mV，对HER的过电位为131 mV，并且对OER的塔菲尔斜率相当低，为35 mV dec，对HER的塔菲尔斜率为56 mV dec。
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