@article{Zhong2025, 
author = {Xinyu Zhong and Yu Chen and Tao Gan and Yuying Huang and Jiong Li and Shuo Zhang},
title = {Unveiling the superior oxygen evolution reaction performance of β-CoMoO4 nanorods: Insights into catalytic mechanisms and active site dynamics},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {3},
pages = {94907204},
keywords = {dynamics, oxygen evolution reaction, synchrotron radiation, X-ray absorption fine structure},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907204},
doi = {10.26599/NR.2025.94907204},
abstract = {Cobalt-based oxides are renowned for their excellent activity in the oxygen evolution reaction (OER), making them promising alternatives to precious metal catalysts. Among these, β-CoMoO4, with its wolframite structure, exhibits superior OER performance compared to widely studied cobalt-based perovskite oxides. However, its underlying catalytic mechanism remains largely unexplored. In this study, we synthesized β-CoMoO4 using a hydrothermal method and achieved remarkable OER catalytic performance in an alkaline environment, with an overpotential of 366 mV at a current density of 10 mA/cm2 and an intrinsic activity of 180 μA/cmox2 at 1.55 V (vs. reversible hydrogen electrode (RHE)). Following OER activation, the micron-sized rod-like structure of β-CoMoO4 dissociates as a whole and reconstructs into amorphous CoOOH, forming a hexagonal flake structure on the scale of hundreds of nanometers. This transformation provides abundant surface active sites with a low-coordination structure. By combining in situ X-ray absorption fine structure (XAFS) with cyclic voltammetry (CV) scanning, we investigated the kinetic behavior of the active sites of β-CoMoO4 as a function of potential. The results indicate that the Co ions in this low-coordination structure can be pre-oxidized at relatively low voltages. Therefore, the excellent OER performance of β-CoMoO4 is attributed to its unique bulk-phase reconstruction behavior and the strong deprotonation ability of the in situ generated amorphous low-coordination active structure. Our research provides valuable insights for the development of new and efficient cobalt-based oxide electrocatalysts for water-splitting applications.}
}