School of Chemistry and Molecular Engineering, East China Normal University , 500 Dongchuan Road, Shanghai 200241, China.
Superconductivity and New Energy R&D Center, Southwest Jiaotong University , Chengdu 610031, China.
ACS Nano. 2017 Oct 24;11(10):10303-10312. doi: 10.1021/acsnano.7b05020. Epub 2017 Sep 14.
Solar-driven overall water splitting is highly desirable for hydrogen generation with sustainable energy sources, which need efficient, earth-abundant, robust, and bifunctional electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, we propose a heterogeneous bimetallic phosphide/sulfide nanocomposite electrocatalyst of NiFeSP on nickel foam (NiFeSP/NF), which shows superior electrocatalytic activity of low overpotentials of 91 mV at -10 mA cm for HER and of 240 mV at 50 mA cm for OER in 1 M KOH solution. In addition, the NiFeSP/NF presents excellent overall water splitting performance with a cell voltage as low as 1.58 V at a current density of 10 mA cm. Combining with a photovoltaic device of a Si solar cell or integrating into photoelectrochemical (PEC) systems, the bifunctional NiFeSP/NF electrocatalyst implements unassisted solar-driven water splitting with a solar-to-hydrogen conversion efficiency of ∼9.2% and significantly enhanced PEC performance, respectively.
太阳能驱动的整体水分解对于利用可持续能源产生氢气是非常理想的，这需要高效、丰富、稳定和双功能的电催化剂，用于氧气析出反应（OER）和析氢反应（HER）。在此，我们提出了一种镍泡沫负载的异质双金属磷化物/硫化物纳米复合材料电催化剂 NiFeSP/NF，它在 1 M KOH 溶液中表现出优异的 HER 电催化活性，在 -10 mA cm 的低过电势下为 91 mV，在 50 mA cm 的 OER 过电势为 240 mV。此外，NiFeSP/NF 表现出优异的整体水分解性能，在 10 mA cm 的电流密度下，电池电压低至 1.58 V。结合 Si 太阳能电池的光伏器件或集成到光电化学（PEC）系统中，双功能 NiFeSP/NF 电催化剂分别实现了无需辅助的太阳能驱动水分解，太阳能到氢气的转换效率约为 9.2%，并显著提高了 PEC 性能。
