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Dopants fixation of Ruthenium for boosting acidic oxygen evolution stability and activity.

Abstract：

:Designing highly durable and active electrocatalysts applied in polymer electrolyte membrane (PEM) electrolyzer for the oxygen evolution reaction remains a grand challenge due to the high dissolution of catalysts in acidic electrolyte. Hindering formation of oxygen vacancies by tuning the electronic structure of catalysts to improve the durability and activity in acidic electrolyte was theoretically effective but rarely reported. Herein we demonstrated rationally tuning electronic structure of RuO2 with introducing W and Er, which significantly increased oxygen vacancy formation energy. The representative W0.2Er0.1Ru0.7O2-δ required a super-low overpotential of 168 mV (10 mA cm-2) accompanied with a record stability of 500 h in acidic electrolyte. More remarkably, it could operate steadily for 120 h (100 mA cm-2) in PEM device. Density functional theory calculations revealed co-doping of W and Er tuned electronic structure of RuO2 by charge redistribution, which significantly prohibited formation of soluble Rux>4 and lowered adsorption energies for oxygen intermediates.

journal_name

Nat Commun

journal_title

Nature communications

authors

Hao S,Liu M,Pan J,Liu X,Tan X,Xu N,He Y,Lei L,Zhang X

doi

10.1038/s41467-020-19212-y

subject

Has Abstract

pub_date

2020-10-23 00:00:00

pages

5368

issue

1

issn

2041-1723

pii

10.1038/s41467-020-19212-y

journal_volume

11

pub_type

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