Breaking Acidic Oxygen Evolution Stability By Tuning Electronic Correlations of Strained RuOx Nanosheets with W and Er

  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Annual Meeting
  • Presentation Date:
    November 16, 2020
  • Duration:
    13 minutes
  • Skill Level:
  • PDHs:

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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⸱cm−2 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⸱cm−2) in acidic PEM for the first time. Simultaneously, W0.2Er0.1Ru1Ox exhibited high mass activity (1518.6 A⸱g−1ox), 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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