Lei Bo, Leng Xueyang, Bai Jinlong, Xie Tengfeng, Xu Lingling
Key Laboratory of Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China.
College of Chemistry, Jilin University, Changchun 130023, China.
ACS Appl Mater Interfaces. 2025 Jan 8;17(1):1191-1200. doi: 10.1021/acsami.4c17198. Epub 2024 Dec 24.
The rapid flame annealing (FA) method has the advantages of convenience and rapidity with an instantaneous temperature rise and fall process. In this work, the influence of flame annealing duration on the front side and back side of CuBiO-based photocathodes was investigated, and photoelectrodes with variable compositions were obtained. A highly efficient CuO@CuO/CuBiO photoelectrode was successfully obtained via a two-step FA method within a few seconds. Excellent hydrogen evolution reaction performance with a photocurrent of 2.3 mA cm @ 0.2 V in 0.1 M NaSO (2.35 mA cm @ 0.6 V in 0.1 M KOH) electrolyte was obtained, which is the highest photocurrent of a CuBiO-based photoelectrode in a neutral electrolyte without a trapping agent so far. The light capture efficiency of the photoelectrode was greatly improved by the introduction of CuO, which formed a heterojunction with CuBiO to promote the charge separation ability. Our work shows the universality of rapid flame annealing in the fabrication of materials, especially for temperature-sensitive compositions.
快速火焰退火（FA）方法具有便捷、快速的优点，其温度能瞬间升降。在本工作中，研究了火焰退火持续时间对基于CuBiO的光阴极正面和背面的影响，并获得了成分可变的光电极。通过两步FA方法在几秒钟内成功制备了高效的CuO@CuO/CuBiO光电极。在0.1 M NaSO电解质中，该光电极在0.2 V时具有2.3 mA cm的光电流（在0.1 M KOH中，0.6 V时为2.35 mA cm），展现出优异的析氢反应性能，这是目前在无俘获剂的中性电解质中基于CuBiO的光电极的最高光电流。通过引入CuO极大地提高了光电极的光捕获效率，CuO与CuBiO形成异质结，促进了电荷分离能力。我们的工作表明快速火焰退火在材料制备中具有通用性，特别是对于对温度敏感的成分。
