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Nature Energy
Article . 2021 . Peer-reviewed
License: Springer Nature TDM
Data sources: Crossref
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Double-atom catalysts as a molecular platform for heterogeneous oxygen evolution electrocatalysis

Authors: Lichen Bai; Chia-Shuo Hsu; Duncan T. L. Alexander; Hao Ming Chen; Xile Hu;

Double-atom catalysts as a molecular platform for heterogeneous oxygen evolution electrocatalysis

Abstract

The oxygen evolution reaction (OER) is an essential anode reaction for the generation of fuels through water splitting or CO2 electroreduction. Mixed metal oxides containing Co, Fe or Ni have proved to be the most promising OER electrocatalysts in alkaline media. However, the active sites and reaction mechanisms of these catalysts are difficult to study due to their heterogeneous nature. Here we describe a general synthesis of Co-, Fe- and Ni-containing double-atom catalysts from their single-atom precursors via in situ electrochemical transformation. Characterization reveals molecule-like bimetallic active sites for these supported catalysts. For each catalyst, we propose a catalytic cycle; all exhibit bimetallic cooperation and follow a similar O–O bond-forming step. However, the mechanisms diverge in the site and source of OH− for O–O bond formation, as well as the order of proton and electron transfer. Our work demonstrates double-atom catalysts as an attractive platform for fundamental studies of heterogeneous OER electrocatalysts. Oxygen evolution reaction (OER) catalysts often comprise multiple metal ions in various configurations, hampering mechanistic understanding of how catalysis proceeds. Now, researchers prepare a series of double-atom OER catalysts based on Ni, Fe and Co, which act as molecular-like models and are more amenable to mechanistic study.

Country
Switzerland
Keywords

complexes, coordination, mechanism, cobalt, efficient, nickel, iron, water oxidation, kinetics, identification

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
235
Top 0.1%
Top 10%
Top 0.1%
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