Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 902, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.163787
Keywords
Oxygen evolution reaction; Electrocatalysis; Heterostructured electrocatalyst; Acidic water splitting; Interface engineering
Categories
Funding
- Chongqing Talent Program
- Key Project of Science and Technology Research Program of Chongqing Municipal Education Commission of China [KJZD-K202100701]
- National Natural Science Foundation of China [21771147]
- Research Foundation of Chongqing Jiaotong University [21JDKJC-A010, 21JDKJC-A011]
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By controlled partial oxidation, a robust Ru-RuO2 heterostructure was designed and constructed for high-performance oxygen evolution reaction under acidic conditions, demonstrating excellent long-term durability.
It is essential but challenging to develop advanced electrocatalysts for oxygen evolution reaction (OER) under acidic conditions to break the activity-stability trade-off. In this work, through the controlled partial oxidation of Ru nanoparticles embedded in amorphous carbon, a robust Ru-RuO2 heterostructure with electronic cooperative interfaces was rationally designed and cleverly constructed. The rich heterogeneous interface between Ru and RuO2 creates a good electronic synergy and achieves high-performance OER electrocatalysis in acidic media. The best Ru-RuO2-NC heterostructure exhibits exceptionally excellent activity with an ultralow overpotential (eta(10)) of 176 mV, a high specific mass activity of 1.37 A mg(Ru)(-1) (J(m)@ 1.53 V), and an outstanding long-term durability over 80 h at 10 mA cm(-2) in acidic environment. More importantly, the Ru-RuO2-NC heterostructure can further be utilized as a bifunctional electrocatalyst to drive acidic overall water splitting with a low cell voltage of 1.55 V and steady operation for at least 40 h at 10 mA cm(2), which possesses potential for implementation in the proton exchange membrane water electrolysis. (C) 2022 Elsevier B.V. All rights reserved.
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