Anionic Hofmeister Effect Regulated Conductivity in Polyelectrolyte Hydrogels for High-Performance Supercapacitor.

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Qingqing Guo, Huawei Su, Xingxiang Ji, Ligang Gai, Haihui Jiang, Libin Liu
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Abstract

The Hofmeister effect not only affects the stability and solubility of protein colloids but also has specific effects on the polymer molecules. Here, the impact of the Hofmeister effect on the electrochemical properties of polyelectrolyte hydrogels at room temperature and subzero temperature studied for the first time. Polyelectrolyte hydrogels exhibit an anti-polyelectrolyte effect in low concentrations of ammonium salt, while they exhibit an obvious Hofmeister effect in high concentrations of ammonium salt. Kosmotropic ions demonstrate strong interaction with water molecules or polymer chains, resulting in the reduction of conductivity of polyelectrolyte hydrogels. However, chaotropic ions exhibit weak interactions with water molecules or molecular chains, leading to an increase in conductivity. The Hofmeister effect has a more significant effect on the polyzwitterion electrolyte. The conductivity of polyzwitterion hydrogel soaked in chaotropic ion is up to 6.2 mS cm-1 at -40 °C. The supercapacitor assembled by polyzwitterion electrolytes maintains a capacitance retention rate of 85% and ≈100% coulomb efficiency after 15 000 cycles at -40 °C. This study elucidates the influence of the Hofmeister effect on conductivity in polyelectrolytes and expands the regulatory approach for improving the performance of energy storage devices.

Abstract Image

用于高性能超级电容器的聚电解质水凝胶中的阴离子霍夫迈斯特效应调节电导率
霍夫迈斯特效应不仅会影响蛋白质胶体的稳定性和溶解度,还会对聚合物分子产生特定影响。本文首次研究了霍夫迈斯特效应对室温和零下温度下聚电解质水凝胶电化学特性的影响。聚电解质水凝胶在低浓度铵盐中表现出抗聚电解质效应,而在高浓度铵盐中则表现出明显的霍夫迈斯特效应。各向同性离子与水分子或聚合物链相互作用强烈,导致聚电解质水凝胶的导电性降低。然而,混沌各向同性离子与水分子或分子链的相互作用较弱,从而导致电导率增加。霍夫迈斯特效应对聚齐聚醚电解质的影响更为显著。在-40 °C时,浸泡在混沌离子中的聚齐聚硅氧烷水凝胶的电导率高达6.2 mS cm-1。聚齐维特电解质组装的超级电容器在-40 °C下循环15 000次后,电容保持率为85%,库仑效率≈100%。这项研究阐明了霍夫迈斯特效应对聚电解质电导率的影响,拓展了提高储能设备性能的调节方法。
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来源期刊
Small Methods
Small Methods Materials Science-General Materials Science
CiteScore
17.40
自引率
1.60%
发文量
347
期刊介绍: Small Methods is a multidisciplinary journal that publishes groundbreaking research on methods relevant to nano- and microscale research. It welcomes contributions from the fields of materials science, biomedical science, chemistry, and physics, showcasing the latest advancements in experimental techniques. With a notable 2022 Impact Factor of 12.4 (Journal Citation Reports, Clarivate Analytics, 2023), Small Methods is recognized for its significant impact on the scientific community. The online ISSN for Small Methods is 2366-9608.
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