(513at) Breaking Acidic Oxygen Evolution Stability By Tuning Electronic Correlations of Strained RuOx Nanosheets with W and Er
AIChE Annual Meeting
2020
2020 Virtual AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Electrocatalysis I: Oxygen
Monday, November 16, 2020 - 9:45am to 10:00am
Designing highly acidic resisting electrocatalysts applied in polymer electrolyte membrane (PEM) remains a grand challenge, particularly, for the oxygen evolution reaction (OER). Here we demonstrate rationally tuning electronic charge redistribution of the highly strained RuOx nanosheets with W and Er that boost the acidic OER stability and follow an adsorbate evolution mechanism (AEM) route, significantly alleviating the dissolution of electrocatalysts. The representative W0.2Er0.1Ru1Ox only required a 169 mV overpotential to reach 10 mA⸱cmâ2 with long-durable stability of 500 h in acidic electrolyte. More remarkably, to further promote W0.2Er0.1Ru1Ox applying in industrial field, the highly strained W0.2Er0.1Ru1Ox could also operate steadily for 120 h (100 mA⸱cmâ2) in acidic PEM for the first time. Simultaneously, W0.2Er0.1Ru1Ox exhibited high mass activity (1518.6 A⸱gâ1ox), which was 28.5 times higher than that of the commercial RuO2. Density functional theory calculations further revealed that W and Er tuned charge redistribution and promoted W0.2Er0.1Ru1Ox following AEM mechanism, which optimized binding energies for oxygen intermediates and highly resisted the dissolution and oxidation of RuOx in acidic electrolyte.
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