Developing a non-platinum (Pt) counter electrode (CE) in dye-sensitized solar cells (DSSCs) gained widespread consideration in scientific research. The counter electrode substitutes for Pt should exhibit enhanced conductivity and electrocatalytic nature. In the current work, tungsten trioxide (WO₃) has been employed as CE in DSSC considering its wide bandgap and n-type property to replace the expensive Pt catalyst for triiodide reduction. Nano-tungsten trioxide (WO₃) was synthesized using sodium tungstate dihydrate (Na₂WO₄∙2H₂O) and sodium chloride (NaCl) in an acidic media by a time-optimized hydrothermal route in an autoclave at 200 °C. Physical characterizations of Nano-WO₃ were investigated using FESEM, EDS, FTIR spectroscopy and XRD. The impedance and Tafel polarization curve studies suggest that WO₃ synthesized after 5 h exhibits lower interfacial charge transfer resistance (R_ct) and higher exchange current density (J_o) which confirms better activity of the same compared to others. The DSSC assembled with WO₃ as CE gives a short-circuit current density (J_sc) of 17.01 mA cm⁻², open-circuit voltage (V_oc) of 0.69 V and, a power conversion efficiency (η) of 5.13%. The results suggest that Nano-WO3 can be considered as a potential candidate to substitute platinum.

在染料敏化太阳能电池（DSSC）中开发非铂（Pt）对电极（CE）在科学研究中得到了广泛的考虑。Pt的对电极替代品应表现出增强的电导率和电催化性质。在当前的工作中，考虑到三氧化钨（WO ₃）的宽带隙和n型特性来代替昂贵的用于还原三碘化物的Pt催化剂，已经将其用作DSSC中的CE。在200℃的高压釜中，通过时间优化的水热路径，在酸性介质中使用钨酸钠二水合物（Na ₂ WO ₄ ∙2H ₂ O）和氯化钠（NaCl）合成了三氧化钨（WO ₃）。纳米WO _3的物理表征用FESEM，EDS，FTIR光谱和XRD进行了研究。阻抗和Tafel极化曲线研究表明，在5小时后合成的WO ₃表现出较低的界面电荷转移电阻（R _ct）和较高的交换电流密度（J _o），这证实了其与其他化合物相比具有更好的活性。以WO ₃作为CE组装的DSSC的短路电流密度（J _sc）为17.01 mA cm ^-2，开路电压（V _oc）为0.69 V，功率转换效率（η））的5.13％。结果表明，纳米WO3可被视为替代铂的潜在候选者。