@article{Hua2023, 
author = {Wei Hua and Huanhuan Sun and Yueying Li and Yu Zhang and Jian-Gan Wang},
title = {Determining the electrochemical activation mechanism of Prussian blue analog precatalysts for a high-efficiency oxygen evolution reaction},
year = {2023},
journal = {Energy Materials and Devices},
volume = {1},
number = {2},
pages = {9370014},
keywords = {electrochemical activation, Prussian blue analogs, oxygen evolution reaction, water splitting},
url = {https://www.sciopen.com/article/10.26599/EMD.2023.9370014},
doi = {10.26599/EMD.2023.9370014},
abstract = {Prussian blue analogs (PBAs) are effective precatalysts for the oxygen evolution reaction (OER); however, the underlying mechanism of their electrochemical activation is still not well elucidated. In this study, we designed and constructed PBA-based precatalysts to determine the electrochemical activation mechanism and achieve high-efficiency OER. The PBAs undergo in situ electrochemical transformation to form the corresponding metal (oxy)hydroxides (M(O)OH) as the true OER catalyst. More importantly, the hexacyanoferrate ligands undergo repetitive interfacial coordination/etching with/from M(O)OH during the activation process. The distinct mechanism could achieve in situ Fe doping and enable defect incorporation. The defect-enriched Fe-NiOOH derived from a well-designed NiHCF/Ni(OH)2 precatalyst requires a low overpotential of 227 mV to reach a current density of 10 mA cm−2 and works stably at 130 mA cm−2 over 100 h. This study provides fundamental insights into the electrochemical activation mechanism for developing advanced precatalysts for OER.}
}