Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 11, Pages 14641-14651Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b03232
Keywords
Double hydroxides; Trifunctional catalysts; Water splitting; Zn air battery
Categories
Funding
- National Natural Science Foundation of China [51572051]
- Natural Science Foundation of Heilongjiang Province [E2016023]
- Fundamental Research Funds for the Central Universities [HEUCF201708]
- Open Project Program of Key Laboratory for Photonic and Electric Bandgap Materials, Ministry of Education, Harbin Normal University [PEBM 201703, PEBM201704]
- 111 project of Ministry Education of China [B13015]
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Larger-scale usage of the clean energies requires advanced energy storage and conversion techniques. Overall water splitting and zinc air systems are promising energy conversion and storage means, but need high-performance, low-cost, and highly stable bifunctional electrocatalysts to hydrogen evolution/oxygen evolution reactions (HER/OER) and OER/oxygen reduction reactions (ORR), respectively. Herein we develop a facile method to fabricate CoMn double hydroxide (DH) hollow spheres as high-performance trifunctional electrocatalysts for overall water splitting and zinc-air battery. The outmost surfaces of the CoMn DH hollow spheres are composed of ultrathin nanosheets with a thickness of approximately 2.5 nm. Owing to the hollow and ultrathin features, CoMn DH hollow spheres exhibit excellent activities and robust stabilities toward HER, OER, and ORB. The overall water electrolyzer assembled with the CoMn DH hollow spheres can drive a current density of 10 mA cm(-2) at an overpotential of merely 420 mV in 1.0 M KOH, among the best reported metal oxides and hydroxides. Remarkably, each all-solid-state Zn air battery with the optimized CoMn DH hollow spheres air-cathode exhibited good cycling stability. Furthermore, two all-solid-state Zn air batteries in series can power 55 red LED and the two-electrode electrolyzer catalyzed by the optimized CoMn DH hollow spheres with excellent operation stabilities.
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