构建银纳米颗粒修饰的四氧化三钴电极用于高性能复合锌电池

doi:10.52396/JUST-2021-0049

摘要/Abstract

摘要： 复合锌电池将过渡金属氧化物和氧气的氧化还原反应整合到一个电池中,可以同时实现高能量效率和高能量密度,是一种极具发展前景的电化学系统.然而,正极通常面临活性物质容量利用率低以及氧还原和析出反应活性差的问题.通过构建一种新型具有银纳米粒子修饰的四氧化三钴电极,得益于银纳米颗粒与四氧化三钴纳米线之间的协同作用,导电性得到了改善,形貌得到了有效的优化.使用该电极,复合锌电池可实现在1.85至1.75、1.6、1.55和1.3 V的电压范围内五级平稳放电,在1 mA·cm^-2时具有18％的高活性材料利用率和0.69 V的低电压差;而且,可以稳定运行500个充放电循环,在10 mA·cm^-2时电压差仅增加0.03 V.这为超高性能复合锌电池提供了一种兼具高活性材料利用率和高氧电催化活性的新型电极.

关键词: 复合锌电池, 氧化钴, 银纳米颗粒, 活性物质利用率, 电压差

Abstract: The hybrid Zn battery is a promising electrochemical system integrating the redox reactions of transition metal oxides and oxygen in a single cell, through which high energy efficiency and energy density can be achieved simultaneously. However, the positive electrode usually suffers from unsatisfactory capacity utilization of the active material and poor oxygen reduction and evolution reaction activity. Here, a novel nano-structured Co₃O₄ electrode with the decoration of Ag nanoparticles is developed. Benefiting from the synergistic function between Ag nanoparticles and Co₃O₄ nanowires, the electric conductivity is improved and the morphology is optimized effectively. With this electrode, a hybrid Zn battery delivers five-step discharge voltage plateaus from 1.85 to 1.75, 1.6, 1.55, and 1.3 V, a high active material utilization ratio of 18%, and a low voltage gap of 0.69 V at 1 mA·cm^-2. Moreover, it can operate stably for 500 cycles with a voltage gap increase of only 0.03 V at 10 mA·cm^-2. This work brings up a novel electrode for an ultra-high performance hybrid Zn battery with both high active material utilization and outstanding oxygen electrocatalytic activity.

Key words: hybrid Zn battery, cobalt oxide, Ag nanoparticles, active material utilization, voltage gap

中图分类号:

TQ152

尚文旭, 俞文涛, 马彦义, 谈鹏. 构建银纳米颗粒修饰的四氧化三钴电极用于高性能复合锌电池[J]. 中国科学技术大学学报, 2021, 51(4): 319-326.

SHANG Wenxu, YU Wentao, MA Yanyi, TAN Peng. Development of the Ag nanoparticle-decorated Co₃O₄ electrode for high-performance hybrid Zn batteries[J]. Journal of University of Science and Technology of China, 2021, 51(4): 319-326.

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