Azadmanjiri Jalal, Regner Jakub, Děkanovský Lukáš, Wu Bing, Luxa Jan, Sofer Zdeněk
Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Prague 6, 166 28, Czech Republic.
Small. 2024 Mar;20(10):e2305972. doi: 10.1002/smll.202305972. Epub 2023 Oct 25.
Dual-functional photo-rechargeable (photo-R) energy storage devices, which acquire stored energy from solar energy harvesting, are being developed to battle the current energy crisis. In this study, these findings on the photo-driven characteristics of MXene-based photocathodes in photo-R zinc-ion capacitors (ZICs) are presented. Along with the pristine Ti C T MXene, tellurium/Ti C T (Te/Ti C T ) hybrid nanostructure is synthesized via facile chemical vapor transport technique to examine them for photocathodes in ZICs. Interestingly, the evaluated self-powered photodetector devices using MXene-based samples revealed a pyro-phototronic behavior introduced into the samples, with higher desirability observed in Te/Ti C T . The photo-R ZICs results exhibited a capacitance enhancement of 50.86% for Te/Ti C T at two scan rates of 5 and 10 mV s under illumination, compared to dark conditions. In contrast, a capacitance enhancement of 30.20% is obtained for the pristine Ti C T at only a 5 mV s scan rate. Furthermore, both samples achieved photo-charging voltage responses of ≈960 mV, and photoconversion efficiencies of 0.01% (for Te/ Ti C T ) and 0.07% (for Ti C T ). These characteristics in MXene-based single photo-R ZICs are significant and considerable with the distinguished integrated photo-R supercapacitors with solar cells, or coupled energy-harvesting and energy-storing devices reported recently in the literature.
双功能光充电（photo-R）储能装置可通过太阳能收集获取存储能量，目前正在研发以应对当前的能源危机。在本研究中，展示了关于photo-R锌离子电容器（ZIC）中基于MXene的光阴极的光驱动特性的这些发现。除了原始的Ti₃C₂Tₓ MXene，还通过简便的化学气相传输技术合成了碲/ Ti₃C₂Tₓ（Te/Ti₃C₂Tₓ）混合纳米结构，以将其用于ZIC中的光阴极。有趣的是，使用基于MXene的样品评估的自供电光电探测器装置显示出引入样品中的热光电子行为，在Te/Ti₃C₂Tₓ中观察到更高的合意性。与黑暗条件相比，photo-R ZICs的结果表明，在5和10 mV s的两种扫描速率下，Te/Ti₃C₂Tₓ在光照下的电容增强了50.86%。相比之下，仅在5 mV s的扫描速率下，原始的Ti₃C₂Tₓ的电容增强了30.20%。此外，两个样品均实现了约960 mV的光充电电压响应，以及0.01%（对于Te/Ti₃C₂Tₓ）和0.07%（对于Ti₃C₂Tₓ）的光电转换效率。基于MXene的单photo-R ZICs的这些特性与最近文献中报道的具有太阳能电池的杰出集成光充电超级电容器或耦合的能量收集和能量存储装置相比，是显著且可观的。
