Ordered Ti-doped FeVO4 nanoblock photoanode with improved charge properties for efficient solar water splitting
Ordered Ti-doped FeVO4 nanoblock photoanode with improved charge properties for efficient solar water splitting
复制标题
有序掺钛 FeVO4 纳米块光阳极具有改进的电荷特性，可实现高效太阳能水分解
DOI：
10.1016/j.jcis.2021.07.037
复制
发表时间：
2021
影响因子：
9.9
通讯作者：
Li Mi
中科院分区：
文献类型：
--
作者：
Zeng Qingyi;Fu Xijun;Chang Sheng;Zhang Qingsong;Xiong Zhu;Liu Yong;Peng Guowen;Li Mi
在FeOOH纳米棒薄膜上滴铸混合Ti和V前驱体，并经过退火处理，制备了具有有序纳米块形貌和均匀Ti掺杂的高光活性fevo4光阳极。结果表明，Ti4+通过取代V5+均匀地掺杂到fevo4晶格中，并提供了更多的o2空位。优化后的膜厚为620 nm，掺杂量为0.3%。与未掺杂样品相比，掺ti光阳极在AM 1.5的背照下，在1.0 VvsAg/AgCl下的光电流增强了~ 219%，达到了~ 1.47 mA cm−2的最优值，并且对h2o2和O2的总裂解活性分别为28.3和14.1 μmol cm−2h−1，具有稳定高效的总体裂解活性。优异的PEC性能可归因于ti掺杂显著提高了载流子浓度和电导率，并促进了半导体/电解质界面上的电荷转移动力学。
Highly photoactive FeVO4photoanodes with ordered nanoblock morphology and uniform Ti-doping were prepared by drop-casting mixed Ti and V precursors onto FeOOH nanorod films and following an annealing process. The results indicate that Ti4+is uniformly doped into the FeVO4lattice by substituting V5+and provides an increased number of O2–vacancies. The optimized film thickness and doping level are 620 nm and 0.3%, respectively. Compared to the undoped sample, the Ti-doped photoanode showed ~ 219% enhancement in photocurrent at 1.0 VvsAg/AgCl under back illumination of AM 1.5, reaching a state-of-the-art value of ~ 1.47 mA cm−2, and also achieved stable and efficient overall water splitting activity with evolution rates of 28.3 and 14.1 μmol cm−2h−1for H2and O2, respectively. The excellent PEC performance could be attributed to the remarkably enhanced charge carrier concentration and conductivity, and the facilitated charge transfer kinetics across the semiconductor/electrolyte interface, as a result of Ti-doping.