钴等离激元超结构粉体催化剂的制备及其光热催化应用

高吸光催化剂对提高光热转换效率具有重要意义, 阵列结构光热催化剂的陷光效应有助于增强光吸收并提高光热转换效率。但是, 现有阵列基光热催化剂仍存在单位面积上活性金属负载量过低的不足, 难以满足实际应用的需求。本研究发展了二氧化硅保护的MOFs热解策略, 获得了单位辐照面积上活性金属质量可调、太阳光吸收效率超过90%的粉体钴等离激元超结构光热催化剂, 通过时域有限差分法模拟计算证实其高吸光能力源于纳米颗粒的等离子杂化效应。相比阵列基等离子体超结构催化剂, 该粉体结构的催化活性和稳定性显著增强, 在相同催化条件下, 二氧化碳转化率从0.9%提高到26.2%。本研究为非贵金属光热催化剂的实际应用奠定了基础。

Preparation and Photothermal Catalytic Application of Powder-form Cobalt Plasmonic Superstructures

Highly light absorptive photocatalysts are of great significance to boost the photothermal conversion efficiency.Light trapping effect of nanoarray structured photothermal catalysts can enhance the light absorption and improve the photothermal conversion efficiency.However,the practical applications of array-based catalysts are hindered by very low loadings of active metal catalysts per unit illumination area.Herein,we develop a SiO2-protected MOFs pyrolysis method for the preparation of powder-form cobalt plasmonic superstructures that enable a 90%absorption efficiency of sunlight and tunable metal loading per unit area.Its high light absorption capacity was confirmed by time-domain finite-difference simulation calculations due to the plasmonic hybridization effect of nanoparticles.Compared with nanoarray-structured plasmonic superstructures,the powder-form catalyst exhibits enhanced catalytic activity and stability,resulting in the increase of CO2 conversion efficiency from 0.9%to 26.2%.This study lays the foundation for the practical application of non-precious metal photothermal catalysts.