Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-12627-2
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Funding
- National Science Foundation for Excellent Young Scholar [51722403]
- National Natural Science Foundation of China [51771134]
- National Youth Talent Support Program
- Guangdong Province [U1601216]
- Tianjin Natural Science Foundation for Distinguished Young Scholar [18JCJQJC46500]
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Directly harvesting solar energy for battery charging represents an ultimate solution toward low-cost, green, efficient and sustainable electrochemical energy storage. Here, we design a sunlight promotion strategy into rechargeable zinc-air battery with significantly reduced charging potential below the theoretical cell voltage of zinc-air batteries. The sunlight-promoted zinc-air battery using BiVO4 or alpha-Fe2O3 air photoelectrode achieves a record-low charge potential of similar to 1.20 and similar to 1.43 V, respectively, under illumination, which is lowered by similar to 0.5-0.8 V compared to the typical charge voltage of similar to 2 V in conventional zinc-air battery. The band structure and photoelectrochemical stability of photoelectrodes are found to be key factors determining the charging performance of sunlight-promoted zinc-air batteries. The introduction of photoelectrode as an air electrode opens a facile way for developing integrated single-unit zinc-air batteries that can efficiently use solar energy to overcome the high charging overpotential of conventional zinc-air batteries.
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