Rational establishment of photo-assisted supercapacitor represents a viable strategy for achieving solar energy conversion and storage. In this study, NiCoS@NiCo-LDH (NCS@NC-LDH) composite electrode was effectively synthesized for a highly efficient asymmetric supercapacitor (ASC). Specific capacitance of NCS@NC-LDH under light condition (3286.25 F g at 1 A g) demonstrated notable improvement in contrast to that under dark condition (2171.5 F g at 1 A g). Meanwhile, NCS@NC-LDH displayed strong photoelectronic memory, as a merely 3 % specific capacitance decreased when discharged under dark compared to that of continuous illumination. Additionally, the assembled aqueous ASC (NCS@NC-LDH//AC) exhibited substantial energy density (83.2 Wh kg at 800 W kg) under light condition. Density functional theory (DFT) calculation further demonstrated that the formed matched band facilitated efficient generation-transfer of photoinduced electrons/holes and thus improved the energy storage behavior. We anticipated that this work may offer new perspectives on developing multi-component composite electrodes tailored for high-performance solar-driven electrochemical energy storage.

中文翻译：

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高性能非对称超级电容器具有显着光电记忆效应的异质结构NiCo2S4@NiCo-LDH复合电极的光辅助充电


合理建立光辅助超级电容器是实现太阳能转换和存储的可行策略。在这项研究中，有效合成了NiCoS@NiCo-LDH（NCS@NC-LDH）复合电极，用于高效非对称超级电容器（ASC）。 NCS@NC-LDH在光照条件下的比电容（1 A g下为3286.25 F g）比黑暗条件下的比电容（1 A g下为2171.5 F g）有显着改善。同时，NCS@NC-LDH表现出很强的光电记忆性，与连续光照相比，在黑暗下放电时比电容仅下降3%。此外，组装的水性ASC（NCS@NC-LDH//AC）在光照条件下表现出相当大的能量密度（800 W kg 时为83.2 Wh kg）。密度泛函理论（DFT）计算进一步表明，形成的匹配带促进了光生电子/空穴的有效生成转移，从而改善了储能行为。我们预计这项工作可能会为开发适合高性能太阳能驱动电化学储能的多组分复合电极提供新的视角。