Ratajczyk Tomasz, Miecznikowski Krzysztof, Majewski Pawel, Maciag Rafal, Donten Mikolaj
University of Warsaw, Faculty of Chemistry, Pasteura 1, Warsaw 02-093, Poland.
ACS Omega. 2025 May 15;10(20):20236-20246. doi: 10.1021/acsomega.4c11131. eCollection 2025 May 27.
Improvement of the efficiency of the water-splitting process is one of the crucial issues to be dealt with in the coming years. In this study, a new method for the preparation of photocatalysts is presented. Two novel light-activated oxygen evolution catalysts were developed, consisting of oxidized forms of tungsten, iron, and zinc or copper. In the two-step synthesis, thin layers of nanostructured tungsten-iron-third metal alloys are electrodeposited from an aqueous bath initially, and then they are annealed in an oxidizing atmosphere. The electroplating technique was used in the designed process to combine high precision in deposition and control of composition with relatively low economic and environmental costs. In addition, the easier formation of highly active tungstate forms in the catalysts may be favored by the structure of the alloy precursors. Conditions for obtaining the layers were optimized based on recorded photocurrents. The analysis of electrode surfaces was performed using spectroscopic and microscopic techniques. The oxygen released during the photooxidation of water with ternary metal oxide semiconductors was monitored using an O membrane sensor (Clark electrode), and the conversion efficiency was found to be approximately 30%.
提高水分解过程的效率是未来几年需要解决的关键问题之一。在本研究中，提出了一种制备光催化剂的新方法。开发了两种新型光激活析氧催化剂，它们由钨、铁、锌或铜的氧化形式组成。在两步合成中，首先从水浴中电沉积纳米结构的钨-铁-第三种金属合金薄层，然后在氧化气氛中进行退火。在设计的过程中使用了电镀技术，以将沉积的高精度和成分控制与相对较低的经济和环境成本相结合。此外，合金前驱体的结构可能有利于在催化剂中更容易形成高活性的钨酸盐形式。基于记录的光电流对获得这些层的条件进行了优化。使用光谱和显微镜技术对电极表面进行了分析。使用O膜传感器（克拉克电极）监测三元金属氧化物半导体光氧化水过程中释放的氧气，发现转化效率约为30%。
