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

Overview

Journal Adv Sci (Weinh)

Specialty Biomedical Engineering

Date 2018 Oct 26

PMID 30356966

Citations 19

Authors

Li-Ming Cao

Yu-Wen Hu

Shang-Feng Tang

Andrey Iljin

Jia-Wei Wang

Zhi-Ming Zhang

Tong-Bu Lu

Affiliations

Soon will be listed here.

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 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 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 current density with remarkable stability. This performance appears to be among the best reported values and is much better than that of the IrO-Pt/C-based electrolyzer.

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