超级电容器
活性炭
电化学
压缩(物理)
材料科学
化学工程
化学
复合材料
电极
有机化学
工程类
物理化学
吸附
作者
Xinyu Cai,Yan Xiao,Wei Sun
标识
DOI:10.1016/j.est.2022.105438
摘要
Applying proper compression during the assembling or operating of the activated‑carbon (AC)-based supercapacitors (SCs) is an effective way of optimizing the energy storage performances, of which the effects may vary dramatically with the porous structures of the ACs. This work converts soybean dreg into ACs with tailorable porous structures via a facile KOH activation. Specific electrochemical performances of the ACs under compression are examined and analyzed for different average pore sizes. With the increase in the compressive stress from 0.25 to 4 MPa, the electrochemical performances of the AC-based SCs are improved, with volumetric capacitance, capacitance retention increased and resistance and self-discharge rate decreased. Furthermore, by analyzing the dependence of specific electrochemical performances on the compressive stress, the compression-responsivity is found to be more profound for the ACs with smaller average pore size. The ACs with an average pore size of 1.38 nm exhibit the most favorable comprehensive electrochemical performances under relatively high compressive stresses. The ACs with an average pore size of 2.24 nm possess balanced energy storage performances for both low and high compressions. Such results may guide the optimization of the SCs assembling and selection of ACs with suitable porous structures for certain application conditions. • The performances of the AC-based supercapacitors are dramatically promoted under proper compression. • The compression-responsivity is more significant for the ACs with relatively smaller pore size. • The favorable average pore size is suggested for applications under certain compressions.
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