This study is dedicated to solving the problems of low energy utilization and low yield in the conventional photocatalytic CO₂ reduction process. Herein, we constructed a novel concentrated solar (light) reactor and enabled the titanium foam-based monolithic photocatalyst TF@TNT/0.4CoO_x-0.1CuO to improve the solar energy utilization efficiency and CO₂ conversion rate by concentrating light and its thermal effect. We found that the yield of CH₄ increased up to 220 times (from 0.53 µmol/cm² to 116.4 µmol/cm²) when the light intensity of the reactor was increased from 400 mW/cm² to 4266 mW/cm² (10.6 times). Meanwhile, the solar-to-fuel conversion efficiency was improved up to 0.35% in the concentrated solar (light) reactor. We further investigated the origin of the photothermal coupling effect with concentrated light through the electrochemical and photochemical measurements. It shows that the concentrated light can further lower the reaction barrier (from 41.62 to 31.51 kJ/mol) and the induced photothermal coupling effect could significantly increase the yield. This provides a valuable strategy for the efficient and environmentally friendly utilization of CO₂ using solar energy.

本研究致力于解决传统光催化CO ₂还原过程中能源利用率低、产率低的问题。在此，我们构建了一种新型聚光太阳能（光）反应器，并使基于泡沫钛的整体式光催化剂 TF@TNT/0.4CoO _x -0.1CuO通过聚光及其热效应提高太阳能利用效率和 CO ₂转化率. 我们发现，当反应器的光强度从 400 mW/cm ²增加到4266 mW/cm ^2时，CH ₄的产率增加了 220 倍（从 0.53 µmol/ cm ²到 116.4 µmol/cm ^{2 ）}（10.6 倍）。同时，在聚光太阳能（光）反应堆中，太阳能到燃料的转换效率提高了 0.35%。我们通过电化学和光化学测量进一步研究了聚光光热耦合效应的起源。这表明集中的光可以进一步降低反应势垒（从 41.62 到 31.51 kJ/mol），诱导的光热耦合效应可以显着提高产率。这为使用太阳能高效且环境友好地利用CO ₂提供了有价值的策略。