BibTex format
@article{Wang:2026:10.1021/acscatal.5c09080,
author = {Wang, Y and Twight, LP and Sagui, NA and Kwak, M and Boettcher, SW and Moss, BS and Stephens, IEL and Durrant, JR and Rao, RR},
doi = {10.1021/acscatal.5c09080},
journal = {ACS Catal},
pages = {6749--6757},
title = {Spectroelectrochemical Studies of Oxygen Evolution Reaction Kinetics for Surface-Incorporated Iron in Nickel Oxyhydroxide Electrocatalysts.},
url = {http://dx.doi.org/10.1021/acscatal.5c09080},
volume = {16},
year = {2026}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - Ni x Fe1-x O y H z is the state-of-the-art catalyst for the oxygen evolution reaction (OER) in alkaline water electrolyzers; however, understanding the impact of Fe on the active sites, reaction mechanism, and consequently intrinsic activity has been under intense debate. In this work, operando UV-vis spectroscopy was used to investigate Fe-free NiO x H y and NiO x H y with Fe selectively incorporated onto the surface. At oxygen-evolution potentials, similar oxidized nickel states were present before and after the Fe incorporation, with negligible changes in their redox potentials. However, the discharge kinetics of the Ni states show a substantial acceleration after the introduction of Fe, consistent with an increase in OER kinetics upon Fe incorporation and formation of active Ni-Fe species. Using optical spectroscopy, we determined the intrinsic reaction time constant per surface Fe site is <0.1 s, which is 2 orders of magnitude faster than Ni sites not in proximity to surface Fe sites (∼10 s), and also an order of magnitude faster than Ni sites in pure NiO x H y (∼1 s). Consequently, we propose that the OER occurs via charge accumulation primarily on Ni centers in these catalysts, followed by hole transport to the surface Fe species where oxygen evolution occurs.
AU - Wang,Y
AU - Twight,LP
AU - Sagui,NA
AU - Kwak,M
AU - Boettcher,SW
AU - Moss,BS
AU - Stephens,IEL
AU - Durrant,JR
AU - Rao,RR
DO - 10.1021/acscatal.5c09080
EP - 6757
PY - 2026///
SN - 2155-5435
SP - 6749
TI - Spectroelectrochemical Studies of Oxygen Evolution Reaction Kinetics for Surface-Incorporated Iron in Nickel Oxyhydroxide Electrocatalysts.
T2 - ACS Catal
UR - http://dx.doi.org/10.1021/acscatal.5c09080
UR - https://www.ncbi.nlm.nih.gov/pubmed/41953214
VL - 16
ER -