期刊
SMALL
卷 16, 期 33, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202002888
关键词
acidic environment; overall water splitting; oxygen reduction; single-atomic Ru sites; trifunctional catalysts
类别
资金
- National Key R&D Program of China [2017YFA0700104]
- National Natural Science Foundation of China [51971157, 21601136, 51808037, 51761165012]
- Tianjin Science Fund for Distinguished Young Scholars [19JCJQJC61800]
- DOE Office of Science [DE-SC0012704]
Development of cost-effective, active trifunctional catalysts for acidic oxygen reduction (ORR) as well as hydrogen and oxygen evolution reactions (HER and OER, respectively) is highly desirable, albeit challenging. Herein, single-atomic Ru sites anchored onto Ti(3)C(2)T(x)MXene nanosheets are first reported to serve as trifunctional electrocatalysts for simultaneously catalyzing acidic HER, OER, and ORR. A half-wave potential of 0.80 V for ORR and small overpotentials of 290 and 70 mV for OER and HER, respectively, at 10 mA cm(-2)are achieved. Hence, a low cell voltage of 1.56 V is required for the acidic overall water splitting. The maximum power density of an H-2-O(2)fuel cell using the as-prepared catalyst can reach as high as 941 mW cm(-2). Theoretical calculations reveal that isolated Ru-O(2)sites can effectively optimize the adsorption of reactants/intermediates and lower the energy barriers for the potential-determining steps, thereby accelerating the HER, ORR, and OER kinetics.
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