Three-dimensional ordered macroporous design of heterogeneous cobalt-iron phosphides as oxygen evolution electrocatalyst

Songan Zhao; Weijin Cao; Lu Lu; Zhaoyang Tan; Yanji Wang; Lanlan Wu; Jingde Li

doi:10.1088/1361-6528/ad21a5

Three-dimensional ordered macroporous design of heterogeneous cobalt-iron phosphides as oxygen evolution electrocatalyst

Nanotechnology. 2024 Feb 12;35(18). doi: 10.1088/1361-6528/ad21a5.

Authors

Songan Zhao¹, Weijin Cao¹, Lu Lu¹, Zhaoyang Tan¹, Yanji Wang¹, Lanlan Wu¹, Jingde Li¹

Affiliation

¹ Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, People's Republic of China.

PMID: 38262057
DOI: 10.1088/1361-6528/ad21a5

Abstract

Oxygen evolution reaction (OER) plays a key role in electrochemical conversion, which needs efficient and economical electrocatalyst to boost its kinetics for large-scale application. Herein, a bimetallic CoP/FeP₂heterostructure with a three-dimensional ordered macroporous structure (3DOM-CoP/FeP₂) was synthesized as an OER catalyst to demonstrate a heterogeneous engineering induction strategy. By adjusting the electron distribution and producing a lot of active sites, the heterogeneous interface enhances catalytic performance. High specific surface area is provided by the 3DOM structure. Additionally, at the solid-gas-electrolyte threephase interface, the electrocatalytic reaction exhibits good mass transfer.In situRaman spectroscopy characterization revealed that FeOOH and CoOOH reconstructed from CoP/FeP₂were the true OER active sites. Consequently, the 3DOM-CoP/FeP₂demonstrates superior OER activity with a low overpotentials of 300/420 mV at 10/100 mA cm^-2and meritorious OER durability. It also reveals promising performance as the overall water splitting anode.

Keywords: heterogeneous phosphide; macroporous design; oxygen evolution reaction.