The exploration of non-noble-metal-based photocatalysts with high efficiency and durability toward hydrogen evolution is vitally necessary to meet the challenges of the global energy and environmental crisis. In this work, we prepared noble-metal-free cobalt phosphide (CoP) as an efficient co-catalyst on La,Cr-codoped SrTiO₃ (La,Cr:SrTiO₃) to form a novel photocatalyst with enhanced H₂ evolution activity. It was evidenced that the introduction of CoP led to a remarkable improvement in the photocatalytic H₂ evolution activity of La,Cr:SrTiO₃, and the content of CoP in the composite had an important influence on the photocatalytic activity. The optimized La,Cr:SrTiO₃/CoP (4 wt%) composite exhibited a catalytic H₂ evolution rate of 198.4 μmol h⁻¹ g⁻¹, which was nearly 27 and 15 times higher than that of La,Cr:SrTiO₃ and CoP, even slightly higher than that of La,Cr:SrTiO₃/Pt (0.5 wt%). More importantly, this novel photocatalyst also showed a long-term stability without noticeable activity degradation. Based on the results of UV–vis diffuse reflectance spectroscopy, photoluminescence spectra, photocurrent response, and electrochemical impedance spectra, we ascribed the enhanced H₂ evolution performance of the La,Cr:SrTiO₃/CoP to a synergistic effect including the broadened visible-light response range, accelerated photogenerated charge separation and transfer efficiency. It is believed that our present work throws light on the rational design of novel, high-performance, visible-light-driven hybrid photocatalysts based on non-noble-metal elements.

中文翻译：

---

CoP改性 的La，Cr掺杂SrTiO ₃作为无贵金属助催化剂的高效电荷分离和转移效率的见解，可产生出众的可见光驱动的光催化制氢†

为了应对全球能源和环境危机的挑战，探索具有高效率和持久性的非贵金属基光催化剂对氢的释放至关重要。在这项工作中，我们制备了无贵金属的磷化钴（CoP）作为在La，Cr共掺杂的SrTiO ₃（La，Cr：SrTiO ₃）上的有效助催化剂，从而形成了具有增强的H ₂析出活性的新型光催化剂。有证据表明，CoP的引入显着改善了La，Cr：SrTiO ₃的光催化H ₂析出活性，并且复合物中CoP的含量对光催化活性具有重要影响。优化的La，Cr：SrTiO ₃/ CoP（4 wt％）复合材料的催化H ₂放出速率为198.4μmolh ^-1 g ^-1，比La，Cr：SrTiO ₃和CoP分别高出27倍和15倍，甚至略高于La，Cr：SrTiO ₃和CoP。 La，Cr：SrTiO ₃ /Pt(0.5重量％）。更重要的是，这种新型光催化剂还显示出长期稳定性，而活性没有明显下降。基于紫外可见漫反射光谱，光致发光光谱，光电流响应和电化学阻抗谱的结果，我们将La，Cr：SrTiO _3的H ₂析出性能提高归因于/ CoP具有协同作用，包括扩大的可见光响应范围，加速的光生电荷分离和转移效率。可以相信，我们目前的工作为基于非贵金属元素的新型，高性能，可见光驱动的杂化光催化剂的合理设计提供了参考。