The development of a highly active photocatalyst for visible‐light water splitting requires a high‐quality semiconductor material and a cocatalyst, which promote the migration of photogenerated charge carriers and surface redox reactions. In this work, cocatalyst loading on an oxyfluoride photocatalyst Pb2Ti2O5.4F1.2 was applied to improve the water oxidation activity. Among the metal oxides examined, RuO2 was found to be the most suitable, and the O2 evolution activity depended on the preparation conditions of Ru/Pb2Ti2O5.4F1.2. The highest activity was obtained with RuCl3‐impregnated Pb2Ti2O5.4F1.2, heated under a flow of H2 at 523 K. The H2‐heated Ru/Pb2Ti2O5.4F1.2 showed an O2 evolution rate ~13 times higher than the analogues without the H2 treatment (e.g., RuO2/Pb2Ti2O5.4F1.2). Physicochemical analyses by means of X‐ray absorption fine‐structure spectroscopy, X‐ray photoelectron spectroscopy, scanning electron microscopy and time‐resolved‐microwave‐conductivity measurement indicated that the optimized photocatalyst contained partially‐reduced RuO2 species having ~5 nm in size, which effectively trapped the photogenerated charge carriers and promoted the oxidation of water into O2. The optimized Ru/Pb2Ti2O5.4F1.2 was workable as an O2‐evolving photocatalyst in Z‐scheme overall water splitting, in combination of Ru‐loaded, Rh‐doped SrTiO3 photocatalyst.

中文翻译：

---

用金属氧化物助催化剂修饰可见光响应性 Pb2Ti2O5.4F1.2 以改善 Z 型整体水分解的光催化 O2 析出

开发用于可见光分解水的高活性光催化剂需要高质量的半导体材料和助催化剂，以促进光生电荷载流子的迁移和表面氧化还原反应。在这项工作中，在氟氧化物光催化剂 Pb2Ti2O5.4F1.2 上负载助催化剂来提高水的氧化活性。在所检测的金属氧化物中，RuO2 被发现是最合适的，并且析氧活性取决于Ru/Pb2Ti2O5.4F1.2 的制备条件。在 523 K 的氢气流下加热的 RuCl3 浸渍的 Pb2Ti2O5.4F1.2 获得了最高的活性。H2 加热的 Ru/Pb2Ti2O5.4F1.2 的 O2 释放速率比没有添加的类似物高约 13 倍。 H2 处理（例如 RuO2/Pb2Ti2O5.4F1.2）。通过 X 射线吸收精细结构光谱、X 射线光电子能谱、扫描电子显微镜和时间分辨微波电导率测量进行的物理化学分析表明，优化的光催化剂含有部分还原的 RuO2 物质，尺寸约为 5 nm，它有效地捕获光生电荷载流子并促进水氧化成O2。优化后的 Ru/Pb2Ti2O5.4F1.2 与负载 Ru、掺铑的 SrTiO3 光催化剂相结合，可作为 Z 型整体水分解中的 O2 释放光催化剂。