Journal
ENERGY STORAGE MATERIALS
Volume 41, Issue -, Pages 427-435Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.06.017
Keywords
Bifunctional electrocatalyst; Oxygen-vacancy; Ordered macroporous; Zn-air batteries
Funding
- Natural Science Foundation of Hebei Province of China [B2020202052, B2019202277]
- Outstanding Youth Project of Guangdong Natural Science Foundation [2021B1515020051]
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, China [EERI_PI2020007]
- Program for the Outstanding Young Talents of Hebei Province, China
- Chunhui Project of Ministry of Education of the People's Republic of China [Z2017010]
- Department of Science and Technology of Guangdong Province [2020B0909030004, 2019JC01L203]
- Guangdong Innovative and Entrepreneurial Team Program [2016ZT06C517]
- Science and Technology Program of Guangzhou [2019050001]
- Science and Technology Program of Zhaoqing [2019K038]
- Natural Sciences and Engineering Research Council of Canada
- Waterloo Institute for Nanotechnology
- NSERC
- National Research Council Canada
- Canadian Institutes of Health Research
- Province ofSaskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
- University of Waterloo
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The three-dimensionally ordered macroporous (3DOM) Co3O4 electrocatalyst with phosphorization treatment demonstrates high bifunctionality for oxygen reduction and evolution reactions, showing promising potential for practical application.
Developing low-cost and high-efficiency bifunctional electrocatalysts for both oxygen evolution and reduction reactions is urgent to fulfill the practical application of rechargeable Zn-air batteries (ZABs). However, to explore the high catalytic performance of air electrocatalysts still remains a challenge. In response, a three-dimensionally ordered macroporous (3DOM) Co3O4 electrocatalyst is designed and synthesized through a nanocasting strategy. A well-controlled phosphorization treatment is further conducted to induce defect engineering on the resulting P-doped Co3O4-delta(3DOM P-Co3O4-delta). With the oxygen vacancy (Vo) tailoring, partial reduction from Co3+ to Co2+ is verified as the key to improving the intrinsic electrocatalytic bifunctionality. By incorporating the geometric and electronic merits, 3DOM P-Co3O4-delta possesses an ORR half-wave potential of 0.82 V and an OER overpotential of 366 mV to achieve 10 mA cm(-2), which is comparable to noble-metal benchmarks. Particularly, under galvanostatic cycling measurements, ZABs using 3DOM P-Co3O4-delta containing air cathode showcase a potential gap of 0.84 V with negligible voltage fading over 250 h at 10 mA cm(-2).
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