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Au depositing and Mg doping synergistically regulates an In2O3 photocatalyst for promoting CO2 reduction and CH4 exclusive generation
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-07-08 , DOI: 10.1039/d4qi01381f Yanduo Liu 1 , Jiadong Li 2 , Xianglan Dong 1 , Lina Dai 1 , Enqi Zhang 1
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-07-08 , DOI: 10.1039/d4qi01381f Yanduo Liu 1 , Jiadong Li 2 , Xianglan Dong 1 , Lina Dai 1 , Enqi Zhang 1
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The photocatalytic reduction of carbon dioxide (CO2) into methane (CH4) is of great significance in the field of energy conversion. In this study, magnesium–gold (Mg–Au) bimetallic-modified indium oxide (In2O3) microspheres were synthesized using a hydrothermal method combined with self-reduction. The introduction of Mg doping resulted in a transformation of CO2 reduction products from a mixture (CO and CH4) to a single CH4 product. Furthermore, the subsequent modification with Au nanoparticles (4Au/2Mg–In2O3, 24.5 μmol g−1 h−1) led to a remarkable 12-fold increase in CH4 production compared with pure In2O3 (2.1 μmol g−1 h−1). This enhancement can be attributed to the lowered conduction band position of In2O3 caused by Mg doping, which directs the photogenerated electrons towards the reduction of CO2 to CH4. The presence of Au nanoparticles further facilitates the effective activation of CO2. Moreover, the specific adsorption of CO2 by Mg also contributes to the CO2 reduction reaction. The bimetallic functional site modification strategy employed in this study provides a meaningful approach to enhance the performance of photocatalysts for CO2 reduction.
中文翻译：
Au沉积和Mg掺杂协同调节In2O3光催化剂促进CO2还原和CH4独家生成
光催化还原二氧化碳（CO 2 ）生成甲烷（CH 4 ）在能源转换领域具有重要意义。本研究采用水热法结合自还原法合成了镁金（Mg-Au）双金属改性氧化铟（In 2 O 3 ）微球。 Mg掺杂的引入导致CO 2 还原产物从混合物（CO和CH 4 ）转变为单一CH 4 产物。此外，随后用 Au 纳米颗粒（4Au/2Mg–In 2 O 3 , 24.5 μmol g −1 h −1 ）进行修饰，导致与纯 In 2 O 3 相比，CH 4 产量显着增加 12 倍（2.1 μmol g −1 h −1 ）。这种增强可归因于 Mg 掺杂导致 In 2 O 3 的导带位置降低，从而将光生电子引导至 CO 2 的还原至 CH 4 。 Au纳米颗粒的存在进一步促进了CO 2 的有效活化。此外，Mg对CO 2 的特异性吸附也有助于CO 2 还原反应。本研究中采用的双金属功能位点修饰策略为增强光催化剂的 CO 2 还原性能提供了一种有意义的方法。
更新日期：2024-07-10
中文翻译：
Au沉积和Mg掺杂协同调节In2O3光催化剂促进CO2还原和CH4独家生成
光催化还原二氧化碳（CO 2 ）生成甲烷（CH 4 ）在能源转换领域具有重要意义。本研究采用水热法结合自还原法合成了镁金（Mg-Au）双金属改性氧化铟（In 2 O 3 ）微球。 Mg掺杂的引入导致CO 2 还原产物从混合物（CO和CH 4 ）转变为单一CH 4 产物。此外，随后用 Au 纳米颗粒（4Au/2Mg–In 2 O 3 , 24.5 μmol g −1 h −1 ）进行修饰，导致与纯 In 2 O 3 相比，CH 4 产量显着增加 12 倍（2.1 μmol g −1 h −1 ）。这种增强可归因于 Mg 掺杂导致 In 2 O 3 的导带位置降低，从而将光生电子引导至 CO 2 的还原至 CH 4 。 Au纳米颗粒的存在进一步促进了CO 2 的有效活化。此外，Mg对CO 2 的特异性吸附也有助于CO 2 还原反应。本研究中采用的双金属功能位点修饰策略为增强光催化剂的 CO 2 还原性能提供了一种有意义的方法。
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