Fe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting,Advanced Science

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Fe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting
Advanced Science ( IF 14.3 ) Pub Date : 2018-08-14 , DOI: 10.1002/advs.201800949
Li-Ming Cao ₁ , Yu-Wen Hu ₁ , Shang-Feng Tang ₂ , Andrey Iljin ₃ , Jia-Wei Wang ₁ , Zhi-Ming Zhang ₂ , Tong-Bu Lu _{1,

2}

Affiliation

Industrial application of overall water splitting requires developing readily available, highly efficient, and stable oxygen evolution electrocatalysts that can efficiently drive large current density. This study reports a facile and practical method to fabricate a non‐noble metal catalyst by directly growing a Co‐Fe Prussian blue analogue on a 3D porous conductive substrate, which is further phosphorized into a bifunctional Fe‐doped CoP (Fe‐CoP) electrocatalyst. The Fe‐CoP/NF (nickel foam) catalyst shows efficient electrocatalytic activity for oxygen evolution reaction, requiring low overpotentials of 190, 295, and 428 mV to achieve 10, 500, and 1000 mA cm⁻² current densities in 1.0 m KOH solution. In addition, the Fe‐CoP/NF can also function as a highly active electrocatalyst for hydrogen evolution reaction with a low overpotential of 78 mV at 10 mA cm⁻² current density in alkaline solution. Thus, the Fe‐CoP/NF electrode with meso/macropores can act as both an anode and a cathode to fabricate an electrolyzer for overall water splitting, only requiring a cell voltage of 1.49 V to afford a 10 mA cm⁻² current density with remarkable stability. This performance appears to be among the best reported values and is much better than that of the IrO₂‐Pt/C‐based electrolyzer.

中文翻译：

源自双金属普鲁士蓝类似物的 Fe-CoP 电催化剂，用于大电流密度析氧和总体水分解

整体水分解的工业应用需要开发易于获得、高效且稳定的析氧电催化剂，能够有效驱动大电流密度。这项研究报道了一种简单实用的方法，通过在 3D 多孔导电基底上直接生长 Co-Fe 普鲁士蓝类似物来制造非贵金属催化剂，并将其进一步磷化成双功能铁掺杂 CoP (Fe-CoP) 电催化剂。 Fe-CoP/NF（泡沫镍）催化剂对析氧反应表现出高效的电催化活性，需要190、295和428 mV的低过电势才能在1.0 m KOH溶液中实现10、500和1000 mA cm ^-2电流密度。此外，Fe-CoP/NF还可以作为析氢反应的高活性电催化剂，在碱性溶液中10 mA cm ^-2电流密度下具有78 mV的低过电势。因此，具有介孔/大孔的Fe-CoP/NF电极可以充当阳极和阴极来制造用于整体水分解的电解槽，仅需要1.49 V的电池电压即可提供10 mA cm ^-2的电流密度卓越的稳定性。该性能似乎属于最佳报告值之一，并且比 IrO ₂ -Pt/C 基电解槽的性能要好得多。

更新日期：2018-08-14

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