Supporting nanomaterials having strong metal-support interaction is the key to an efficient catalyst. The present paper describes a morphology-controlled synthesis of silver (Ag) nanoparticles supported on nanostructured tungsten oxide (WO₃) for selective photoelectrocatalytic carbon dioxide reduction reactions (CO₂RR) under visible light irradiation. Highly dispersed Ag on WO₃ nanorod was synthesized by a one-pot preparation method in the presence of cetyltrimethylammonium bromide (CTAB). The synthesis strategy remained intact and reproduced by varying loading of Ag, which was further confirmed by various characterization techniques like XRD, SEM, TEM, STEM elemental mapping, Raman, XPS, FT-IR, and BET analysis. The morphological growth of the WO₃ nanorod (NR) and the related mechanism was studied and discussed in the paper. 1.5 wt % Ag showed optimum loading for high dispersion over WO₃-NR and efficient CO₂RR with high current density (0.4 mA cm⁻²), towards the desired selective product formation (formic acid). The efficiency of the catalyst was further correlated with cluster vacancies on the interface of Ag particle and WO₃ nanorod by positron doppler broadening (DB) spectroscopy.

具有强的金属-载体相互作用的载体纳米材料是高效催化剂的关键。本文描述了形态控制合成的银（Ag）纳米粒子负载在纳米结构的氧化钨（WO ₃）上的选择性光电催化二氧化碳还原反应（CO ₂ RR）在可见光照射下。在十六烷基三甲基溴化铵（CTAB）存在下，通过一锅法制备了在WO ₃纳米棒上高度分散的Ag 。合成策略保持不变并通过改变Ag的负载量而得以复制，这通过各种表征技术（如XRD，SEM，TEM，STEM元素图谱，拉曼，XPS，FT-IR和BET分析）进一步证实。WO的形态生长_本文对3纳米棒（NR）及其相关机理进行了研究和讨论。1.5 wt％Ag表现出最佳负载度，以实现在WO ₃ -NR上的高分散性和高电流密度（0.4 mA cm ^-2）的有效CO ₂ RR ，从而达到所需的选择性产物形成（甲酸）。通过正电子多普勒增宽（DB）光谱进一步将催化剂的效率与Ag颗粒与WO ₃纳米棒的界面上的簇空位相关。