Electrostatic Field Enhanced Photocatalytic CO(2) Conversion on BiVO(4) Nanowires.
Electrostatic Field Enhanced Photocatalytic CO(2) Conversion on BiVO(4) Nanowires.
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DOI：
10.1007/s40820-021-00749-6
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发表时间：
2021-12-06
影响因子：
26.6
通讯作者：
Han W
中科院分区：
文献类型：
--
作者：
Yue S;Chen L;Zhang M;Liu Z;Chen T;Xie M;Cao Z;Han W
在压电换能器的压电衬底上沉积了外露（010）面的BiVO4纳米线。在压电基板上施加应力产生的静电场中，CO2转化率显著提高了5.5倍。产物中甲烷的摩尔率由29%提高到64%。性能的提高主要归功于光载流子的分离/转移，以及极性分子的吸附增强。在线版本包含补充材料，可在10.1007/s40820-021-00749-6获得。光催化体系中载流子的复合损失决定了光催化剂的能量转换效率。在这项工作中，静电场通过在空间上分离光空穴和光电子来抑制光催化剂中光载流子的复合。将（010）面外露BiVO4纳米线作为模型结构生长在压电换能器（PZT）的pdms绝缘压电衬底上。PZT衬底在一定的应力作用下会产生静电场，BiVO4纳米线的光催化行为受到静电场的影响。结果表明，在负静电场下，BiVO4纳米线的CO2还原光催化性能提高到无静电场时的5.5倍。产物中甲烷的浓度由原来的29%提高到64%。二氧化碳还原效率的提高主要是由于抑制了BiVO4纳米线中光载流子的重组损失。光载流子能量的增加和对极性分子（本例中为CO）的表面吸收的增强对光催化剂的光催化活性和产物选择性的提高也起着重要作用。本文提出了改善光催化系统中光载流子分离/转移动力学的有效策略，这也将为光伏和光探测设备提供有利的参考。在线版本包含补充材料，可在10.1007/s40820-021-00749-6获得。
BiVO4 nanowires with exposed (010) facets were deposited on the piezoelectric transducer piezo-substrate. CO2 conversion rate was significantly improved by 5.5-time in an electrostatic field generated by applying a stress on the piezo-substrate. The mole percentage of methane in products was increased from 29% to 64%. The improved performance was attributed to the facilitated photo-carriers separation/transfer, as well as the enhanced adsorption of polar molecules. The online version contains supplementary material available at 10.1007/s40820-021-00749-6. The recombination loss of photo-carriers in photocatalytic systems fatally determines the energy conversion efficiency of photocatalysts. In this work, an electrostatic field was used to inhibit the recombination of photo-carriers in photocatalysts by separating photo-holes and photo-electrons in space. As a model structure, (010) facet-exposed BiVO4 nanowires were grown on PDMS-insulated piezo-substrate of piezoelectric transducer (PZT). The PZT substrate will generate an electrostatic field under a certain stress, and the photocatalytic behavior of BiVO4 nanowires is influenced by the electrostatic field. Our results showed that the photocatalytic performance of the BiVO4 nanowires in CO2 reduction in the negative electrostatic field is enhanced to 5.5-fold of that without electrostatic field. Moreover, the concentration of methane in the products was raised from 29% to 64%. The enhanced CO2 reduction efficiency is mainly attributed to the inhibited recombination loss of photo-carriers in the BiVO4 nanowires. The increased energy of photo-carriers and the enhanced surface absorption to polar molecules, which are CO in this case, were also play important roles in improving the photocatalytic activity of the photocatalyst and product selectivity. This work proposed an effective strategy to improve photo-carriers separation/transfer dynamics in the photocatalytic systems, which will also be a favorable reference for photovoltaic and photodetecting devices. The online version contains supplementary material available at 10.1007/s40820-021-00749-6.
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