CoP/N‐Doped Carbon Nanowire Derived from Co‐Based Coordination Polymer as Efficient Electrocatalyst toward Oxygen Evolution Reaction

Abstract

The development of cheap, high‐efficiency, and long‐term durable oxygen evolution reaction (OER) electrocatalysts has become a research hotspot. Carbon‐confined transition‐metal phosphides derived from coordination polymers and metal–organic frameworks have received great attention. Herein, a CoP/N‐doped carbon ‐ 400 (CoP/NC‐400) nanowire is prepared using a coordination polymer [Co(C 4 H 7 NO 4 )]· x H 2 O (Co‐Asp, Asp = l ‐aspartic acid) nanowire as the precursor and template through simultaneous pyrolysis and low‐temperature phosphidation. Electrochemical tests indicate that the CoP/NC‐400 nanowire displays better OER properties than CoP/NC‐300/500 nanowires. The overpotential required to reach a current density of 10 mA cm −2 is 320 mV with a minimum Tafel slope of 89 mV dec −1 . Moreover, at a higher current density, the OER performance of the CoP/NC‐400 nanowire is superior to that of RuO 2 . The excellent electrochemical performance of the CoP/NC‐400 nanowire is attributed to the high electrochemical surface area and the strong synergistic effect of the CoP nanoparticle and the N‐doped carbon nanowire.