The photo-assisted charging supercapacitors that integrate solar energy conversion and energy storage in one device have inspired great interests. In this work, a bulk homojunction WO/WO was prepared through doping Ni in WO, and was used as the active material of photoelectrodes. The Ni-doped WO/WO photoelectrodes exhibited superior photoelectric property and excellent capacity for energy storage. The optimal WN2 photoelectrode showed a specific capacitance of 667.7 F.g at current density of 4 A.g under light illumination, which was 19.4% higher than that in dark. The photogenerated charge carriers and the efficient separation of charge carriers induced by homojunction could be responsible for the photo-enhanced charge storage. After cycling test, WN2 photoelectrode retained about 92% of its initial specific capacitance without irradiation, and surprising 102% of its initial specific capacitance with irradiation. The electrochemical energy storage process of WN2 photoelectrode was found to be dominated by bulk solid-state diffusion, and the mechanism analysis provided theoretical evidence for photo-assist enhanced electrochemical performance of the prepared electrodes.

中文翻译：

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镍离子 (Ni2+) 掺杂诱导形成 W18O49/W3O8 体同质结以增强光辅助储能

将太阳能转换和能量存储集成在一台设备中的光辅助充电超级电容器引起了人们的极大兴趣。在这项工作中，通过在WO中掺杂Ni制备了本体同质结WO/WO，并将其用作光电极的活性材料。 Ni掺杂的WO/WO光电极表现出优异的光电性能和优异的储能能力。最佳WN2光电极在光照强度为4 Ag的电流密度下表现出比电容为667.7 Fg，比黑暗条件下的比电容高19.4%。光生载流子和同质结引起的载流子的有效分离可能是光增强电荷存储的原因。经过循环测试后，WN2光电极在没有照射的情况下保留了约92%的初始比电容，而在照射下则令人惊讶地保留了其初始比电容的102%。研究发现WN2光电极的电化学储能过程以体相固态扩散为主，机理分析为光辅助增强所制备电极的电化学性能提供了理论依据。