Well-designed 3D/2D WO₃/g-C₃N₄ microspheres with an effective interfacial contact, synthesized through facile single step hydrothermal method, for stimulating photocatalytic CO₂ reduction under visible light has been investigated. The direct growth of WO₃ microspheres with g-C₃N₄ enables good interaction among the both semiconductors, enabling proficient charge carrier separation. Highest CO and CH₄ production over WO₃/g-C₃N₄ of 145 and 133 μmole g⁻¹ h⁻¹ was achieved, 1.91 and 4.03-fold higher than using pristine g-C₃N₄, respectively. This enhanced photoactivity was noticeable due to the synergistic effect with the larger interfacial contact area and proficient charge carrier separation. More importantly, CH₄ and CO production was increased by 2.51 and 1.64-fold with optimized H₂O/CO₂ feed ratio due to efficient adsorption of both the reactants. Similarly, by replacing water with H₂, CO₂ reduction efficiency was increased by 1.5 and 2.6-fold higher for CO and CH₄ production. The photon flux also has a significant contribution in CO₂ reduction, whereas, 1.6 and 1.7-fold higher CO and CH₄ production observed by increasing light intensity. The stability analysis reveals continuous production of CO and CH₄ in cycles without any obvious deactivation under both the lower and higher light intensity. This work demonstrates a new approach to construct composite heterojunction and would be beneficial for further investigation in selective CO₂ conversion to solar fuels.

研究了设计良好的3D / 2D WO ₃ / gC ₃ N ₄微球与有效界面接触的微球，该微球通过简便的一步水热法合成，用于刺激可见光下的光催化还原CO ₂。具有gC ₃ N ₄的WO ₃微球的直接生长使两种半导体之间具有良好的相互作用，从而实现了电荷载流子的充分分离。超过WO ₃ / gC ₃ N ₄的145和133μmoleg ^-1 h ^-1的最高CO和CH ₄产量与使用原始gC ₃ N _4相比，分别获得了1.91倍和4.03倍的吸附。由于具有更大的界面接触面积和足够的电荷载流子分离的协同效应，这种增强的光活性是明显的。更重要的是，由于两种反应物的有效吸附，在优化的H ₂ O / CO ₂进料比下，CH ₄和CO的产量分别增加了2.51和1.64倍。类似地，通过用H ₂代替水，生产CO和CH _4的CO ₂还原效率分别提高了1.5倍和2.6倍。光子通量在CO _2中也有重要贡献减少，而通过增加光强度观察到的CO和CH ₄产量分别高1.6和1.7倍。稳定性分析表明，在低光强度和高光强度下，循环产生的CO和CH ₄连续产生，而没有任何明显的失活。这项工作证明了一种构造复合异质结的新方法，将有利于进一步进行选择性CO ₂转化为太阳能的研究。