Iron‐Cobalt‐Cerium Multimetallic Oxides Derived from Prussian Blue Precursors: Enhanced Oxygen Evolution Electrocatalysis
Yaqiong Wu, Yuxuan Kong, Binjie Du, Tian Liu, Shuanglu Ying, Dengke Xiong, Fei‐Yan Yi
Abstract
Abstract Exploring non‐precious metal‐based electrocatalysts is still challenging in 21 st century. In this work, a series of hexagonal bipyramidal Ce‐based PBA materials as precursors with different Fe/Co metal ratios, namely as CeFe x Co 1−x ‐PBA, are successfully constructed via co‐precipitation method and converted into corresponding metal oxides (denoted as Fe x Co 1−x CeO y ) via thermal treatment. Then, they as electrocatalysts realize highly efficient oxygen evolution reaction (OER). Especially, as‐synthesized Fe 0.7 Co 0.3 CeO y electrocatalyst shows very low overpotentials of 320 mV at the current density of 10 mA cm −2 and the Tafel slop of 98.4 mV dec −1 in 1 M KOH with remarkable durability for 24 h, which was due to the synergistic effect of multi‐metal FeCoCe centers. Furthermore, a two‐electrode cell of Fe 0.7 Co 0.3 CeO y /NF||Pt/C/NF realizes outstanding overall water splitting with a voltage of only 1.71 V at 10 mA cm −2 and remarkable long‐term durability, that is even superior to benchmark IrO 2 /NF||Pt/C/NF counterpart.