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Promoting H2O2 production via 2-electron oxygen reduction by coordinating partially oxidized Pd with defect carbon
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Promoting H2O2 production via 2-electron oxygen reduction by coordinating partially oxidized Pd with defect carbon
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Journal Article
Promoting H2O2 production via 2-electron oxygen reduction by coordinating partially oxidized Pd with defect carbon
2020
Overview
Electrochemical synthesis of H
2
O
2
through a selective two-electron (2e
−
) oxygen reduction reaction (ORR) is an attractive alternative to the industrial anthraquinone oxidation method, as it allows decentralized H
2
O
2
production. Herein, we report that the synergistic interaction between partially oxidized palladium (Pd
δ+
) and oxygen-functionalized carbon can promote 2e
−
ORR in acidic electrolytes. An electrocatalyst synthesized by solution deposition of amorphous Pd
δ+
clusters (Pd
3
δ+
and Pd
4
δ+
) onto mildly oxidized carbon nanotubes (Pd
δ+
-OCNT) shows nearly 100% selectivity toward H
2
O
2
and a positive shift of ORR onset potential by ~320 mV compared with the OCNT substrate. A high mass activity (1.946 A mg
−1
at 0.45 V) of Pd
δ+
-OCNT is achieved. Extended X-ray absorption fine structure characterization and density functional theory calculations suggest that the interaction between Pd clusters and the nearby oxygen-containing functional groups is key for the high selectivity and activity for 2e
−
ORR.
Electrocatalysts which deliver high selectivity for two-electron oxygen reduction to hydrogen peroxide in acidic media are sought to replace the conventional anthraquinone process. Here, the authors develop partially oxidised palladium clusters on carbon nanotubes with near 100% selectivity.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
