Ultralow charge–discharge voltage gap of 0.05 V in sunlight-responsive neutral aqueous Zn–air battery

IF 19.5 1区 材料科学 Q1 CHEMISTRY, PHYSICAL Carbon Energy Pub Date : 2024-03-28 DOI:10.1002/cey2.535
Zhimin Niu, Yan Gao, Tianhui Wu, Fei Zhang, Ran Zhao, Zijia Chen, Yiming Yuan, Tifeng Jiao, Jianmin Gu, Li Lu, Desong Wang
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Abstract

Rechargeable neutral aqueous zinc−air batteries (ZABs) are a promising type of energy storage device with longer operating life and less corrosiveness compared with conventional alkaline ZABs. However, the neutral ZABs normally possess poor oxygen evolution reactions (OERs) and oxygen reduction reactions performance, resulting in a large charge–discharge voltage gap and low round-trip efficiency. Herein, we demonstrate a sunlight-assisted strategy for achieving an ultralow voltage gap of 0.05 V in neutral ZABs by using the FeOOH-decorated BiVO4 (Fe-BiVO4) as an oxygen catalyst. Under sunlight, the electrons move from the valence band (VB) of Fe-BiVO4 to the conduction band producing holes in VB to promote the OER process and hence reduce the overpotential. Meanwhile, the photopotential generated by the Fe-BiVO4 compensates a part of the charging potential of neutral ZABs. Accordingly, the energy loss of the battery could be compensated via solar energy, leading to a record-low gap of 0.05 V between the charge and discharge voltage with a high round-trip efficiency of 94%. This work offers a simple but efficient pathway for solar-energy utilization in storage devices, further guiding the design of high energy efficiency of neutral aqueous ZABs.

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阳光响应型中性锌-空气水溶液电池中 0.05 V 的超低充放电电压间隙
与传统的碱性锌空气电池相比,可充电的中性锌空气电池(ZABs)具有更长的工作寿命和更低的腐蚀性,是一种很有前途的储能设备。然而,中性锌空气电池通常具有较差的氧进化反应(OER)和氧还原反应性能,导致充放电电压差距较大,往返效率较低。在此,我们展示了一种阳光辅助策略,即使用 FeOOH 装饰的 BiVO4(Fe-BiVO4)作为氧催化剂,在中性 ZAB 中实现 0.05 V 的超低电压间隙。在阳光照射下,电子从 Fe-BiVO4 的价带(VB)移动到导带,在 VB 中产生空穴,促进 OER 过程,从而降低过电位。同时,Fe-BiVO4 产生的光电势可以补偿中性 ZAB 的部分充电电势。因此,电池的能量损失可以通过太阳能来补偿,从而使充放电电压之间的差距达到创纪录的 0.05 V,往返效率高达 94%。这项工作为在存储设备中利用太阳能提供了一条简单而高效的途径,进一步指导了高能效中性水性 ZAB 的设计。
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来源期刊
Carbon Energy
Carbon Energy Multiple-
CiteScore
25.70
自引率
10.70%
发文量
116
审稿时长
4 weeks
期刊介绍: Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.
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Issue Information Cover Image, Volume 6, Number 10, October 2024 Back Cover Image, Volume 6, Number 10, October 2024 Interface and doping engineering of V2C-MXene-based electrocatalysts for enhanced electrocatalysis of overall water splitting Issue Information
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