氧化还原滴定方法理论新说

为了改造氧化还原滴定分析方法的标度,从而逐步建立统一的滴定分析标度计算式,提出了相对电子浓度Re-的概念,基于此发展了以p R_(e-)为监测标度的氧化还原滴定方法新理论。该理论描述了氧化还原半反应的平衡,推导了氧化还原滴定标度p Re-的计算通式,探索了该标度在滴定过程中的一般变化规律,重新梳理了指示剂的指示原理。以Ce^(4+)滴定Fe^(3+)溶液为例,演绎了如何简单绘制滴定曲线、计算滴定突跃范围、判断可否直接准确滴定,讨论了氧化还原反应条件平衡常数K_(τ)^(θ’)的大小对滴定分析的影响。

Recent progress in the all-solid-state flexible supercapacitors

In the past few years,supercapacitors(SCs)have attracted great attention in both academic and industrial sectors due to their high energy storage efficiency,reliable stability,and eco-friendly process.Flexible solid-state SCs as one of the ongoing focuses for the development of wearable and portable electronics have become the most promising energy storage devices for the smart power system due to their high power density,fast electrochemical response,high efficiency on the charge-discharge process,and excellent electrochemical stability.In this study,the recent progress in the electrodes and electrolytes used for approaching high-performance of the all-solid-state flexible SCs is reviewed.We first introduce basic operational principles of various SCs.And then we overview the electrode materials including carbon materials,conducting polymers,transition metal oxides/chalcogenides/nitrides,MXenes,metal-organic frameworks,covalent-organic frameworks,and the polymer-based solid-state electrolytes in different systems.Afterward,we summarize recent progress in the development of the all-solid-state flexible SCs and outlook for future research directions.