Ni single atoms anchored on N-doped carbon nanosheets as bifunctional electrocatalysts for Urea-assisted rechargeable Zn-air batteries

The sluggish kinetics of oxygen electrode reactions is a bottleneck for the development of rechargeable Zn-air batteries (ZABs). Herein, we report a bifunctional electrocatalyst synthesized by anchoring individually dispersed Ni single atoms on N-doped carbon nanosheets (Ni SAs-NC), which exhibits a...

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Veröffentlicht in:Applied catalysis. B, Environmental Environmental, 2022-08, Vol.310, p.121352, Article 121352
Hauptverfasser: Jiang, Hao, Xia, Jing, Jiao, Long, Meng, Xiangmin, Wang, Pengfei, Lee, Chun-Sing, Zhang, Wenjun
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Sprache:eng
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Zusammenfassung:The sluggish kinetics of oxygen electrode reactions is a bottleneck for the development of rechargeable Zn-air batteries (ZABs). Herein, we report a bifunctional electrocatalyst synthesized by anchoring individually dispersed Ni single atoms on N-doped carbon nanosheets (Ni SAs-NC), which exhibits an outstanding overall performance for oxygen reduction reaction (ORR) and urea oxidation reaction (UOR). Based on that, a conceptual urea-assisted rechargeable ZAB by coupling ORR with UOR of a low thermodynamic potential is demonstrated to have significantly decreased charging voltage and high urea elimination rate. The high bifunctional electrocatalytic activities of Ni SAs-NC endow the urea-assisted ZAB with a dramatically increased energy conversion efficiency of 71.8%, which is improved by 17.1% as compares with the conventional ZABs. The successful implementation of Ni SACs based urea-assisted rechargeable ZABs with an improved energy conversion efficiency may prompt ZAB technology towards practical applications. [Display omitted] •A catalyst of Ni single atoms anchored on N-doped carbon nanosheets.•The Ni SAs-NC demonstrates remarkable ORR/UOR activities.•A urea-assisted ZAB with increased energy conversion efficiency is constructed.•The urea-assisted ZAB is available for electricity generation and urea elimination.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2022.121352