TY - JOUR
T1 - Surface Interrogation Scanning Electrochemical Microscopy of Ni1-xFexOOH (0 < x < 0.27) Oxygen Evolving Catalyst
T2 - Kinetics of the "fast" Iron Sites
AU - Ahn, Hyun S.
AU - Bard, Allen J.
N1 - Publisher Copyright:
© 2015 American Chemical Society.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/1/13
Y1 - 2016/1/13
N2 - Nickel-iron mixed metal oxyhydroxides have attracted significant attention as an oxygen evolution reaction (OER) catalyst for solar fuel renewable energy applications. Here, we performed surface-selective and time-dependent redox titrations to directly measure the surface OER kinetics of NiIV and FeIV in NiOOH, FeOOH, and Ni1-xFexOOH (0 < x < 0.27) electrodes. Most importantly, two types of surface sites exhibiting "fast" and "slow" kinetics were found, where the fraction of "fast" sites in Ni1-xFexOOH matched the iron atom content in the film. This finding provides experimental support to the theory-proposed model of active sites in Ni1-xFexOOH. The OER rate constant of the "fast" site was 1.70 s-1 per atom.
AB - Nickel-iron mixed metal oxyhydroxides have attracted significant attention as an oxygen evolution reaction (OER) catalyst for solar fuel renewable energy applications. Here, we performed surface-selective and time-dependent redox titrations to directly measure the surface OER kinetics of NiIV and FeIV in NiOOH, FeOOH, and Ni1-xFexOOH (0 < x < 0.27) electrodes. Most importantly, two types of surface sites exhibiting "fast" and "slow" kinetics were found, where the fraction of "fast" sites in Ni1-xFexOOH matched the iron atom content in the film. This finding provides experimental support to the theory-proposed model of active sites in Ni1-xFexOOH. The OER rate constant of the "fast" site was 1.70 s-1 per atom.
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U2 - 10.1021/jacs.5b10977
DO - 10.1021/jacs.5b10977
M3 - Article
AN - SCOPUS:84954311127
VL - 138
SP - 313
EP - 318
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 1
ER -