摘要
含氧化还原活性基团的苯醌衍生物,在水系质子电池里是一种比容量高、资源丰富的理想电极材料,然而其高溶解性和低的工作电压不利于质子电池的循环稳定性和能量密度的提升,引入吸电子基团不仅可以降低其LUMO能量来提升其反应电位,还可以一定程度上抑制其溶解来提升稳定性。因此,通过电化学研究并对比了3种不同的苯醌化合物作为质子电池的电极材料,研究了不同氯取代情况造成的影响。其中四氯取代的四氯苯醌(4Cl-BQ)反应电位最高(0.51 V vs.Ag/AgCl),多电子氧化还原反应机制使其在水系质子电池里具有158 mAh/g的出色容量和高的倍率性能,并且氯取代有效抑制了溶解,在1 A/g的电流密度下也能稳定循环超过1200圈,显示出优异的性能。最后通过探究了电荷的快速反应动力学特征解释了出色的倍率性能。该研究表明,通过引入-Cl基团改进的4Cl-BQ,能进一步提升其在电池里综合性能,是一种极具发展潜力的水系质子电池材料。
Benzoquinone compounds containing redox-active groups are an ideal electrode material with high specific capacity and abundant resources in aqueous proton batteries.However,its high solubility and low operating voltage are not conducive to the cycle stability and energy density of proton batteries.The introduction of electron-absorbing groups can not only reduce its LUMO energy level to enhance its reaction potential,but also suppress its solubility to improve its stability to a certain extent.Therefore,in this work,the effects caused by different chlorine substitution were investigated by comparing three different benzoquinone compounds as electrode materials for proton batteries.Among them,the tetrachlorinated substituted tetrachlorobenzoquinone(4Cl-BQ)has the highest reaction potential(0.51 V vs.Ag/AgCl),and the multi-electron redox reaction mechanism gives it excellent capacity of 158 mAh/g and high-rate performance in aqueous proton battery,and the chlorine substitution effectively inhibits dissolution and shows outstanding cycling performance after 1200 cycles at 1 A/g.Finally,the excellent rate performance is explained by exploring its fast charge kinetic characteristics.This work shows that 4Cl-BQ,improved by the introduction of the-Cl group,can further enhance its comprehensive performance and is a promising material for aqueous proton batteries.
作者
王飞翔
侯剑
彭成信
WANG Fei-xiang;HOU Jian;PENG Cheng-xin(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《广州化学》
CAS
2023年第3期36-39,48,共5页
Guangzhou Chemistry
关键词
质子电池
有机电极材料
苯醌衍生物
吸电子基团
proton battery
organic material
benzoquinone derivative
electron-absorbing group
