嵌入多孔碳基质中的 Cu-BTC 限制合成 Cu-Cu2O-CuS 纳米结，用于显着的光热 CO2 转化,Journal of Materials Chemistry A

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嵌入多孔碳基质中的 Cu-BTC 限制合成 Cu-Cu2O-CuS 纳米结，用于显着的光热 CO2 转化
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-03-17 , DOI: 10.1039/d3ta00110e
Yajie Chen ₁ , Yi Ding ₁ , Wei Han ₁ , Wei Li ₁ , Xinyan Yu ₁ , Guohui Tian ₁

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利用太阳能将光热催化CO ₂还原成燃料是减少CO ₂排放同时生产增值碳化合物的理想策略。然而，开发低成本和高效的光热催化剂仍然是一个重大挑战。在此，光热混合催化剂 (Cu-Cu ₂ O-CuS@C)，高度分散的 Cu-Cu ₂ O-CuS 纳米结（小于 10 nm）限制在多孔氮掺杂碳八面体矩阵中，通过使用制备的苯-1,3,5-三羧酸铜（Cu-BTC）八面体作为前体的简单热解-氧化-硫化路线。制备的Cu-Cu ₂O-CuS@C样品表现出显着的光热转换效应，更多的光子可以转化为热能以促进光氧化还原催化。同时，形成的Cu ₂ O-CuS p-n纳米结和Cu-Cu ₂ O-CuS肖特基结极大地加速了电荷传输，从根本上暴露了更多的催化活性位点并改善了反应物吸附。因此更多的电子可以被激发和弛豫以参与CO ₂还原反应。这些积极因素使得优化后的Cu-Cu _{2 O-CuS@C催化剂对CO}₂转化为CO（22.6 μmol h ^-1 g ^-1）和CH ₄表现出显着的光热催化活性(3.06 μmol h ^-1 g ^-1 )。这项工作为制造用于太阳能利用和转化的高效光热催化剂提供了合理的策略。

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Cu-BTC-confined synthesis of Cu-Cu2O-CuS nanojunctions embedded in a porous carbon matrix for remarkable photothermal CO2 conversion

Photothermal catalytic CO₂ reduction into fuels using solar energy is an ideal strategy to reduce CO₂ emission while producing value-added carbon compounds. However, developing low-cost and high-efficiency photothermal catalysts remains a significant challenge. Herein, photothermal hybrid catalysts (Cu-Cu₂O-CuS@C), highly dispersed Cu-Cu₂O-CuS nanojunctions (sub-10 nm) confined within a porous nitrogen-doped carbon octahedron matrix, are designed and fabricated through a simple pyrolysis-oxidation-sulfidation route using the prepared copper benzene-1,3,5-tricarboxylate (Cu-BTC) octahedra as the precursor. The prepared Cu-Cu₂O-CuS@C sample exhibits a significant photothermal conversion effect, and more photons can be converted into thermal energy for promoting photoredox catalysis. Meanwhile, the formed Cu₂O-CuS p–n nanojunction and Cu-Cu₂O-CuS Schottky junction greatly accelerate charge transport, fundamentally expose more catalytic active sites and improve reactant adsorption. Thus more electrons could be excited and relaxed to participate in CO₂ reduction reactions. These positive factors make the optimized Cu-Cu₂O-CuS@C catalyst demonstrate remarkable photothermal catalytic activity toward CO₂ conversion into CO (22.6 μmol h⁻¹ g⁻¹) and CH₄ (3.06 μmol h⁻¹ g⁻¹). This work provides a rational strategy to fabricate efficient photothermal catalysts for solar energy utilization and conversion.

更新日期：2023-03-17

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