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Mechanical Control of Photocatalysis in 2D Ferroelectrics
Solar RRL ( IF 6.0 ) Pub Date : 2023-09-14 , DOI: 10.1002/solr.202300589 Xiaoqing Liu 1, 2 , Junhui Wang 3 , Faling Lin 1 , Lei Shen 2
Solar RRL ( IF 6.0 ) Pub Date : 2023-09-14 , DOI: 10.1002/solr.202300589 Xiaoqing Liu 1, 2 , Junhui Wang 3 , Faling Lin 1 , Lei Shen 2
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Strain is a conventional mechanical means for optimizing light absorption of photocatalysts. Herein, an additional degree of freedom–ferroelectricity is introduced into this process, enhancing not only solar absorption but also photogenerated carrier separation and carrier-driven forces through opto-electro-mechanical coupling. This approach is illustrated using a 2D ferroelectric material, In2Se3. The findings show that strain can adjust its bandgap for improved absorption and solar-to-hydrogen efficiency, and can also change its polarization to selectively control water-splitting products. Specifically, strain manipulation can tune the bandgap within a range of 0.5–1.5 eV, thereby better aligning it with the solar spectrum, and increasing solar-to-hydrogen conversion efficiency to 6.6%. Additionally, strain-induced changes in the polarization (internal electric field) of ferroelectric In2Se3 can alter redox potentials, selectively promoting hydrogen or oxygen reduction on the surface by ferroelectric switching. These findings provide a theoretical basis for designing and optimizing efficient 2D ferroelectric photocatalysts.
中文翻译：
二维铁电体中光催化的机械控制
应变是优化光催化剂光吸收的传统机械手段。在此过程中，引入了额外的自由度——铁电性，不仅增强了太阳能吸收，还通过光机电耦合增强了光生载流子分离和载流子驱动力。该方法使用二维铁电材料 In 2 Se 3进行说明。研究结果表明，应变可以调整其带隙以提高吸收和太阳能转化为氢气的效率，并且还可以改变其偏振以选择性地控制水分解产物。具体来说，应变操纵可以将带隙调整在0.5-1.5 eV的范围内，从而更好地使其与太阳光谱对齐，并将太阳能到氢气的转化效率提高到6.6%。此外，应变引起的铁电In 2 Se 3极化（内部电场）的变化可以改变氧化还原电位，通过铁电切换选择性地促进表面上的氢或氧还原。这些发现为设计和优化高效二维铁电光催化剂提供了理论基础。
更新日期：2023-09-14
中文翻译：
二维铁电体中光催化的机械控制
应变是优化光催化剂光吸收的传统机械手段。在此过程中，引入了额外的自由度——铁电性，不仅增强了太阳能吸收，还通过光机电耦合增强了光生载流子分离和载流子驱动力。该方法使用二维铁电材料 In 2 Se 3进行说明。研究结果表明，应变可以调整其带隙以提高吸收和太阳能转化为氢气的效率，并且还可以改变其偏振以选择性地控制水分解产物。具体来说，应变操纵可以将带隙调整在0.5-1.5 eV的范围内，从而更好地使其与太阳光谱对齐，并将太阳能到氢气的转化效率提高到6.6%。此外，应变引起的铁电In 2 Se 3极化（内部电场）的变化可以改变氧化还原电位，通过铁电切换选择性地促进表面上的氢或氧还原。这些发现为设计和优化高效二维铁电光催化剂提供了理论基础。
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