Structural and electronic engineering of zirconium-induced bimetallic phosphides supported by nitrogen-doped carbon fibers for highly efficient oxygen evolution reaction

摘要

The exploitation of non noble metal oxygen evolution reaction (OER) electrocatalysts with tuneable electronic structures and chemical compositions is an effective way to improve water splitting, which is of great significance to the development of clean energy. Here, we report a zirconium-induced transition metal phosphide supported by nitrogen-doped carbon fiber (P-CoFeZr/NCBC) as an efficient electrocatalyst for the OER. The electrocatalyst is produced in situ on the surface of nitrogen-doped carbon fibers to form an open structure, achieving a high concentration of active sites. Additionally, the electronic structure is modified through the introduction of zirconium to increase the intrinsic activity of the electrocatalyst. These phenomena greatly enhance the oxygen evolution activity of the electrocatalyst. In alkaline media, P-CoFeZr/NCBC exhibits excellent catalytic activity and fast kinetics, with overpotentials and Tafel slopes of 300 mV and 51 mV/dec at 10 mA/cm(2), and displays excellent long-term stability for more than 24 h at 50 mA/cm(2). (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.