文献类型：期刊文献

英文题名：How Thermal Effect Regulates Cyclic Voltammetry of Supercapacitors

作者：Zhao, Teng[1]; Zhao, Shuangliang[2,3]; Zhou, Shenggao[4]; Xu, Zhenli[4]

机构：[1] School of Mathematical Sciences, Shanghai Jiao Tong University, Shanghai, 200240, China; [2] State Key laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [3] Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China; [4] School of Mathematical Sciences, MOE-LSC, CMA-Shanghai and Shanghai Center for Applied Mathematics, Shanghai Jiao Tong University, Shanghai, 200240, China

年份：2023

外文期刊名：arXiv

收录：EI(收录号：20230206721)

语种：英文

外文关键词：Capacitance - Electrolytes - Electrolytic capacitors - Statistical mechanics - Supercapacitor

摘要：Cyclic voltammetry (CV) is a powerful technique for characterizing the electrochemical properties of electrochemical devices. During charging-discharging cycles, the thermal effect can have a profound impact on its performance. However, existing theoretical models cannot clarify such intrinsic mechanism and often give poor prediction. Herein, we propose an interfacial model for the electro-thermal coupling, based on fundamentals in non-equilibrium statistical mechanics. By incorporating molecular interactions, our model shows a quantitative agreement with experimental measurements. The integral capacitance shows a first enhanced then decayed trend against the applied heat bath temperature. Such a relation is attributed to the competition between electrical attraction and Born repulsion via dielectric inhomogeneity, which was not well understood in previous models. In addition, as evidenced in recent experimental CV tests, our model predicts the non-monotonic dependence of the capacitance on the bulk electrolyte density. This work demonstrates a potential pathway towards next-generation thermal regulation of electrochemical devices. Copyright ? 2023, The Authors. All rights reserved.