Flexible Waterproof Rechargeable Hybrid Zinc Batteries Initiated by Multifunctional Oxygen Vacancies-Rich Cobalt Oxide
Flexible Waterproof Rechargeable Hybrid Zinc Batteries Initiated by Multifunctional Oxygen Vacancies-Rich Cobalt Oxide
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DOI：
10.1021/acsnano.8b04317
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发表时间：
2018-08-01
期刊：
影响因子：
17.1
通讯作者：
Zhi, Chunyi
中科院分区：
文献类型：
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作者：
Ma, Longtao;Chen, Shengmei;Zhi, Chunyi
虽然锌 - 空气电池和锌离子电池均以锌为基础，但它们分别在能量密度和功率密度方面表现出色。在此，我们采用氩等离子体刻蚀一种具有丰富氧空位的氧化钴（记为Co3O4 - x）。将氧空位引入氧化钴不仅促进了其可逆的Co - O ⇌ Co - O - OH氧化还原反应，还使其具有良好的氧还原反应和析氧（ORR/OER）性能（半波电位为0.84 V，ORR为四电子转移过程，OER的过电位为330 mV，塔菲尔斜率为58 mV·dec⁻¹）。然后，我们构建了一个基于Zn - Co3O4 - x和锌 - 空气电化学反应的电池系统。该混合电池展现出3200 W·kg⁻¹的高功率密度和1060 Wh·kg⁻¹的高能量密度。此外，所开发的柔性固态混合电池表现出良好的防水和可水洗能力（在20小时浸水测试后容量保持率为99.2%，1小时水洗测试后容量保持率为93.2%）。有趣的是，所制备的柔性电池可在水下工作，并且在电量耗尽后，只要暴露在空气中，电池就能自动恢复电力输出。考虑到其电化学性能、良好的环境适应性和“空气可恢复性”，所开发的装置适用于可穿戴应用。此外，这项研究强调了通过对电极材料进行改性来开发混合储能技术的方法。
Although both are based on Zn, Zn-air batteries and Zn-ion batteries are good at energy density and power density, respectively. Here, we adopted Ar-plasma to engrave a cobalt oxide with abundant oxygen vacancies (denoted as Co3O4-x). The introduction of oxygen vacancies to cobalt oxide not only promotes its reversible Co-O Co-O-OH redox reaction but also leads to good oxygen reduction reaction and oxygen evolution (ORR/OER) performance (a half-wave potential of 0.84 V, four-electron transfer process for ORR, and 330 mV overpotential, 58 mV.dec(-1) Tafel slope for OER). We then constructed a battery system based on both Zn-Co3O4-x, and Zn-air electrochemical reactions. The hybrid battery reveals both a high-power density of 3200 W.kg(-1) and high-energy density of 1060 Wh.kg(-1). Furthermore, the developed flexible solid-state hybrid batterydemonstrates good waterproof and washable ability (99.2% capacity retention of after 20 h water soaking test and 93.2% capacity retention after 1 h washing test). Interestingly, the fabricated flexible battery can work under water, and after the power is exhausted, the battery can automatically recover electricity output as long as it is exposed to air. The developed device is suitable for wearable applications considering its electrochemical performances, great environmental adaptation, and "air recoverability". In addition, this study underscores the approach to develop hybrid energy-storage technologies through modification of electrode materials.