Superhydrophobic Photochromic TiO 2 /Bi 2 WO 6 Materials Promote Photocatalytic CO 2 Reduction under Visible Light Irradiation

作者：Hong Qian, Binxia Yuan, Yuhao Liu, Rui Zhu, Chengxi Zhang, Hexing Li · 发表于：ACS Applied Materials & Interfaces · 年份：2025 · DOI：10.1021/acsami.5c06303 · 被引用次数：9 · 研究领域：Advanced Photocatalysis Techniques、Gas Sensing Nanomaterials and Sensors、Advanced Nanomaterials in Catalysis

Photocatalytic CO 2 reduction to renewable fuels presents a promising strategy to mitigate greenhouse effects, yet challenges persist in achieving high efficiency due to CO 2 ’s thermodynamic stability and competitive H 2 O adsorption. Herein, we develop a superhydrophobic photochromic TiO 2 /Bi 2 Wo 6 (TBW-2O) nanocomposite that synergistically enhances visible-light-driven CO 2 reduction. Dynamic charge management via reversible W 6+ ↔W 5+ transitions not only suppresses charge recombination but also facilitates electron transfer for CO 2 activation, as evidenced by in situ XPS and EPR. The superhydrophobic surface designed with sodium oleate (water contact angle >150°) selectively enriches CO 2 at the active sites compared to H 2 O (Δ G CO 2 = −2.88 eV vs Δ G H 2 O = −1.17 eV). Dual heterojunction effects (Type II + Z-scheme) between TiO 2 and Bi 2 WO 6 optimize light absorption and redox potentials. The optimized TBW-2O achieves exceptional CH 4 and CO production rates of 48.09 and 37.40 μmol·g –1 ·h –1, respectively, representing 19.7- and 6.6-fold enhancements over pure TiO 2 . Notably, it attains an apparent quantum yield (AQY) of 0.35% (CH 4 ) and 0.32% (CO) at 350 nm without sacrificial agents or noble metals. Combined experimental and theoretical analyses reveal that the W 6+ /W 5+ redox cycle and hydrophobic interface collaboratively promote COOH/CHO intermediate formation, steering the reaction pathway toward CH 4 . This work provides a design blueprint for multif...