The development of efficient catalysts to overcome the significant overpotential of the oxygen evolution reaction (OER) is the key bottleneck in the large-scale production of pure hydrogen. In the present work, we describe a simple approach for the fabrication of CoS₂–TiO₂ hybrid catalysts by the heat treatment of a cobalt thiourea complex in the presence of TiO₂. We show the CoS₂–TiO₂ hybrid as a bi-functional electrocatalyst for overall water splitting in alkaline electrolyte membrane water electrolyzers. The optimal CoS₂–TiO₂ hybrid offered low overpotentials of 231 and 198 mV for the OER and HER, respectively. Fundamental studies pertaining to the role of TiO₂ in enhancing the catalytic activity of the materials using optical and electrochemical band gap measurements of the CoS₂–TiO₂ hybrids were carried out. Additionally, the constructed MEA using the CoS₂–TiO₂ hybrid showed higher performance with an approximately 234 mA cm⁻² current density at a cell voltage of 1.9 V and exhibited extended durable operation over 200 h, as compared to the MEA constructed with state-of-the-art all-noble-metal electrodes.

中文翻译：

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CoS ₂ –TiO ₂杂化纳米结构：用于碱性电解质膜水电解槽的高效耐用的双功能电催化剂†

开发有效的催化剂以克服氧气释放反应（OER）的明显超电势是大规模生产纯氢的关键瓶颈。在当前的工作中，我们描述了一种通过在TiO ₂存在下对钴硫脲配合物进行热处理来制造CoS ₂ -TiO ₂杂化催化剂的简单方法。我们展示了CoS ₂ -TiO ₂杂化物作为双功能电催化剂，可用于碱性电解质膜水电解槽中的总水分解。最佳CoS ₂ -TiO ₂杂化为OER和HER分别提供231和198 mV的低过电势。使用CoS ₂ -TiO ₂杂化物的光学和电化学带隙测量，进行了有关TiO ₂在增强材料催化活性中的作用的基础研究。此外，与采用状态构造的MEA相比，使用CoS ₂ -TiO ₂杂化体构造的MEA在1.9 V的电池电压下表现出更高的性能和大约234 mA cm ^-2的电流密度，并在200 h内具有更长的耐用性。最先进的全贵金属电极。