Open AccessFe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting
Author(s) -
Cao LiMing,
Hu YuWen,
Tang ShangFeng,
Iljin Andrey,
Wang JiaWei,
Zhang ZhiMing,
Lu TongBu
Publication year - 2018
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201800949
Subject(s) - electrocatalyst , prussian blue , overpotential , water splitting , oxygen evolution , electrolysis , chemical engineering , materials science , anode , cathode , alkaline water electrolysis , catalysis , current density , bifunctional , electrolyte , electrolysis of water , exchange current density , inorganic chemistry , electrode , chemistry , electrochemistry , tafel equation , physics , photocatalysis , quantum mechanics , engineering , biochemistry
Abstract 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 IrO 2 ‐Pt/C‐based electrolyzer.