期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 6, 页码 2694-2704出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c11675
关键词
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资金
- National Natural Science Foundation of China [22075163, 51872156, 22005215]
- Na t i o n a l Key Research Program [2020YFC2201103, 2020YFA0210702]
- Hebei Province Innovation Ability Promotion Project [20312201D]
- China Postdoctoral Science Foundation [2020M670343]
A Mn-doped RuO2 bimetallic oxide with atomic-scale dispersion of Mn atoms exhibits remarkable activity and super durability for both ORR and OER, providing a new catalyst design strategy for Zn-air batteries.
The development of high-efficiency and durable bifunctional electrocatalysts for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical for the widespread application of rechargeable zinc-air (Zn-air) batteries. This calls for rational screening of targeted ORR/OER components and precise control of their atomic and electronic structures to produce synergistic effects. Here, we report a Mn-doped RuO2 (Mn-RuO2) bimetallic oxide with atomic-scale dispersion of Mn atoms into the RuO2 lattice, which exhibits remarkable activity and super durability for both the ORR and OER, with a very low potential difference (Delta E) of 0.64 V between the half-wave potential of ORR (E-1/2) and the OER potential at 10 mA cm(-2) (E-j10) and a negligible decay of E-1/2 and E-j10 after 250 000 and 30 000 CV cycles for ORR and OER, respectively. Moreover, Zn-air batteries using the Mn-RuO2 catalysts exhibit a high power density of 181 mW cm(-2), low charge/discharge voltage gaps of 0.69/0.96/1.38 V, and ultralong lifespans of 15 000/2800/1800 cycles (corresponding to 2500/467/300 h operation time) at a current density of 10/50/100 mA cm(-2), respectively. Theoretical calculations reveal that the excellent performances of Mn-RuO2 is mainly due to the precise optimization of valence state and d-band center for appropriate adsorption energy of the oxygenated intermediates.
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