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在盐电解质中,高表面积化的卓越循环性

James Kasten¹, Cheng-Che Hsiao¹, Denis Johnson¹

¹Artie McFerrin Department of Chemical Engineering, Texas A&M University College Station TX 77843 USA.

Nanoscale advances

|June 29, 2023

概括

高表面积的化瓦纳 (VN) 在超级电容器中性盐溶液中表现更好. 与传统的性溶液相比,离子电解质提供了优越的电容保持和稳定性.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

高表面积的化 (VN) 对水性超级电容器来说是有希望的,但在性介质中存在容量保留和安全问题.
中性水性盐溶液可以提高超级电容器的性能和安全性,但分析有限.

研究的目的:

在各种中性水性化物和硫酸盐电解质中合成和表征高表面积VN用于超级电容器应用.
评估基于VN的超级电容器在中性电解质中使用不同的金属离子 (Mg2+,Ca2+,Na+,K+,Li+) 的性能.

主要方法:

高表面积化 (VN) 的合成和表征.
在各种中性水性盐溶液 (化物和硫酸盐) 中对VN进行电化学测试,这些盐溶液含有不同的阳离子 (Mg2+,Ca2+,Na+,K+,Li+).
性能评估包括容量,保留和在不同扫描速率下循环稳定性.

主要成果:

在盐电解质中观察到Mg2+ > Li+ > K+ > Na+ > Ca2+的性能趋势.
离子系统表现出卓越的性能,在2000mVs-1.0下达到1M MgSO4中的294 μF cm-2的面积容量.
在1M MgSO4中的VN表现出从2到2000mV s-1的36%容量保留,显著优于1M KOH (7%的保留).
循环后,MgSO4和MgCl2电解质的电容性增加,并在1000个循环后保持高值,与1MKOH显著下降不同.

结论:

离子电解质显著提高了基于VN的水性超级电容器的性能和稳定性.
这种卓越的性能归因于一个可逆的表面2e转移伪电容机制,其中包括Mg2+和VN-xOy.
这些发现为开发更安全,更稳定,更快充的水性超级电容器铺平了道路.

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