In2O3/Bi19Br3S27 S型异质结增强光催化CO2还原

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中文摘要：近年来,半导体催化剂因其较强的氧化还原能力和较好的稳定性而受到广泛关注.然而,光生电子和空穴对易复合和低氧化性导致单一半导体催化剂难以实现实际应用.深入研究表明,S型异质结具有独特的电子和空穴分离机理、强大的氧化还原能力和较强的载流子分离驱动力.本研究以在In2O3纳米球上生长的Bi19Br3S27纳米花为原料,采用水热法合成了In2O3/Bi19Br3S27梯形异质结.这种梯形异质结有效地促进了光生电荷载流子的分离和转移.结果表明,In2O3/Bi19Br3S27复合材料对CO2的还原产率高达28.36 μmol h-1 g-1,分别是In2O3和Bi19Br3S27的19和3.5倍.此外,通过原位漫反射红外傅里叶变换光谱对参与光催化反应的中间体进行了研究,揭示了光催化还原CO2的反应过程.本工作为构建S型异质结光催化剂增强CO2催化还原的方法提供了较好的研究思路.

外文标题：In2O3/Bi19Br3S27 S-scheme heterojunction with enhanced photocatalytic CO2 reduction

外文摘要：In recent years,semiconductor catalysts have attracted lots of attention due to their substantial redox cap-ability and adequate stability.However,many semiconductor catalysts have difficulties in realizing real word applications because of the high complexation and low oxidizing ability of photogenerated electron-holes.In-depth investigation has re-vealed that the S-scheme heterojunction possesses a unique mechanism of carrier movement,resulting in a robust redox capacity and strong driving force.Herein,we synthesized an In2O3/Bi19Br3S27 step-scheme(S-scheme)heterojunction through the hydrothermal method comprised of Bi19Br3S27 nanoflowers grown on In2O3 nanospheres.This configuration effectively facilitates the separation and transfer of photo-generated charge carriers.As a result,the reduction yield of CO2 by In2O3/Bi19Br3S27 composite reaches 28.36 μnol h-1 g-1,which is 19 times higher than that of In2O3 and 3.5 times higher than that of Bi19Br3S27.Furthermore,the intermediates involved in the photocatalytic reaction were examined through in situ diffuse reflectance infrared Fourier transform spec-troscopy,revealing the reaction process of photocatalytic re-duction of CO2.This work offers a concept on the method of constructing S-scheme heterojunction photocatalysts to en-hance the catalyzed reduction of CO2.

外文关键词：

photocatalytic CO2 reductionS-scheme heterojunc-tionIn2O3Bi19Br3S27

作者：

卞玉琴、何厚伟、Graham Dawson、张金锋、代凯

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作者单位：

Laboratory of Green and Precise Synthetic Chemistry and Applications,Ministry of Education,Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation,Anhui Province Key Laboratory of Intelligent Computing and Applications,Anhui Province Industrial Generic Technology Research Center for Alumics Materials,Huaibei Normal University,Huaibei 235000,China

Department of Chemistry,Xi'an Jiaotong Liverpool University,Suzhou 215123,China

关键词：

photocatalytic CO2 reduction S-scheme heterojunc-tion In2O3 Bi19Br3S27

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaExcellent Scientific Research and Innovation Team of Education Department of Anhui Provincemajor projects of Education Department of Anhui ProvinceAnhui Provincial Quality Engineering Project

项目编号：

22278169519730782022AH0100282022AH0400682022sx134

出版年：

2024

DOI：

10.1007/s40843-023-2725-y

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(2)

参考文献量92