Photo-assisted supercapacitor systems offer a compelling approach to effectively harnessing both solar and electrical energy. In this study, the core–shell heterostructure NiCo2S4@Ni3V2O8 (NCS@NVO) was successfully synthesized for the development of photosensitive supercapacitor electrodes. NCS@NVO demonstrated a pronounced photoelectron memory effect under illumination, attributed to the solar-driven contributions of both NCS and NVO, as photon absorption facilitated electron-hole pair separation and transport. Compared to the specific capacitance in the dark (2292F g−1 at 1 A g−1), the capacitance of the NCS@NVO composite electrode increased dramatically to 3025F g−1 when exposed to light. Moreover, the capacitance retention rate remained remarkably high at 99.83 % after 10,000 cycles at 20 A g−1. In addition, the NCS@NVO hybrid supercapacitor achieved an outstanding energy density of 63.56 W h kg−1 under illumination, alongside a power density of 789.84 W kg−1. This study thoroughly investigated the solar-induced photoelectron memory effect in the NCS@NVO composite electrode for asymmetric supercapacitors, paving the way for the design of high-performance photosensitive nano-electrodes in advanced electrochemical energy storage applications.

中文翻译：

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非对称超级电容器具有优异电化学储能的核壳NiCo2S4@Ni3V2O8复合电极中涉及的太阳能驱动诱导光电子记忆效应


光辅助超级电容器系统为有效利用太阳能和电能提供了一种引人注目的方法。在这项研究中，成功合成了核壳异质结构 NiCo2S4@Ni3V2O8 （NCS@NVO） 用于光敏超级电容器电极的开发。NCS@NVO证明了在照明下明显的光电子记忆效应，这归因于 NCS 和 NVO 的太阳能驱动贡献，因为光子吸收促进了电子-空穴对的分离和传输。与黑暗中的比电容（2292F g-1 在 1 A g-1）相比，NCS@NVO复合电极的电容在光照下急剧增加至 3025F g-1。此外，在 20 A g-1 下循环 10,000 次后，电容保持率仍然非常高，为 99.83 %。此外，NCS@NVO 混合超级电容器在照明下实现了 63.56 W h kg-1 的出色能量密度，以及 789.84 W kg-1 的功率密度。本研究深入研究了非对称超级电容器NCS@NVO复合电极中的太阳诱导光电子记忆效应，为高性能光敏纳米电极在先进电化学储能应用中的设计铺平了道路。