Ni Huanyang, Fang Yusu, Hu Yucheng, Xiao Guohong, Wu Xiaomin, Jiang Feng
Institute of Hydrogen Energy for Carbon Peaking and Carbon Neutralization, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, China.
Institute of Semiconductor Science and Technology, South China Normal University, 55 Zhongshan Avenue West, Tianhe District, Guangzhou 510631, China.
ACS Appl Mater Interfaces. 2023 Oct 11;15(40):46861-46871. doi: 10.1021/acsami.3c09146. Epub 2023 Sep 28.
GeSe photovoltaic thin films are very promising for photoelectrochemical (PEC) hydrogen evolution. The GeSe-based PEC water splitting device is a system containing a photoelectrode, electrolyte, and other packages, and the performance of the GeSe photoelectrode inside the system is very sensitive to the PEC system environment, such as the electrolyte temperature, pH, and concentration. Here, we reveal how the electrolyte environment at the electrolyte/photoelectrode interface influences the optoelectronic/PEC properties of GeSe photoelectrodes. It was found that the photocurrent density of the GeSe photoelectrode increased with temperature between 10 and 50 °C but decreased when the temperature was over 50 °C. In addition, the pH values of the electrolyte were inversely proportional to the photocurrent density of the GeSe photoelectrode. Moreover, the PEC performance improved as the sodium ion concentration of the electrolyte increased. The results in this work should provide a new direction for further optimizing the performance of photoelectrodes.
锗硒光伏薄膜在光电化学（PEC）析氢方面具有很大的潜力。基于锗硒的PEC水分解装置是一个包含光电极、电解质和其他组件的系统，系统内部锗硒光电极的性能对PEC系统环境非常敏感，如电解质温度、pH值和浓度。在此，我们揭示了电解质/光电极界面处的电解质环境如何影响锗硒光电极的光电/PEC性能。研究发现，锗硒光电极的光电流密度在10至50°C之间随温度升高而增加，但当温度超过50°C时则降低。此外，电解质的pH值与锗硒光电极的光电流密度成反比。而且，随着电解质中钠离子浓度的增加，PEC性能得到改善。这项工作的结果应为进一步优化光电极性能提供新的方向。
