Dion–Jacobson-type perovskite oxide KCa₂Ta₃O₁₀ has been identified as a promising semiconductor for photocatalytic H₂ evolution. However, its ultraviolet-light-driven nature restricts its practical application. To solve this problem, for the first time, g-C₃N₄/KCa₂Ta₃O₁₀ (CN/KCTO) 2D–2D nanosheet heterojunctions with strong interfacial interaction were developed by a facile two-step wet chemistry strategy. The H₂ evolution rate of CN/KCTO was more than twice that of bare CN. The good photocatalytic H₂ evolution activity of CN/KCTO under visible light irradiation indicated that the formation of 2D–2D heterojunction structure not only can enhance the solar spectrum utilization of KCTO, but also can effectively accelerate the photo-induced charge separation and elevate the charge transfer efficiency of CN. This work implies that the construction of 2D–2D heterojunctions with strong interfacial interaction based on Dion–Jacobson-type perovskite oxide and a narrow band gap semiconductor material is an effective way to obtain high-performance visible-light-driven photocatalysts for solar fuel production.

中文翻译：

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Dion–Jacobson型钙钛矿KCa ₂ Ta ₃ O ₁₀纳米片与gC ₃ N ₄纳米片杂交以产生光催化H ₂ †

Dion–Jacobson型钙钛矿氧化物KCa ₂ Ta ₃ O ₁₀被确定为光催化H ₂析出的有前途的半导体。但是，其紫外线驱动的性质限制了其实际应用。为了解决这个问题，首次采用简便的两步湿化学方法开发了具有强界面相互作用的gC ₃ N ₄ / KCa ₂ Ta ₃ O ₁₀（CN / KCTO）2D–2D纳米片异质结。CN / KCTO的H ₂析出速率是裸CN的两倍以上。良好的光催化H ₂CN / KCTO在可见光照射下的演化活性表明，2D–2D异质结结构的形成不仅可以提高KCTO的太阳光谱利用率，而且可以有效地加速光诱导的电荷分离，提高CN的电荷转移效率。这项工作表明，基于Dion-Jacobson型钙钛矿氧化物和窄带隙半导体材料构建具有强界面相互作用的2D-2D异质结是获得高性能可见光驱动光催化剂用于太阳能生产的有效途径。