Improvement of selectivity for CO2 reduction by using Cu2ZnSnS4 electrodes modified with different buffer layers (CdS and In2S3) under visible light irradiation
Improvement of selectivity for CO2 reduction by using Cu2ZnSnS4 electrodes modified with different buffer layers (CdS and In2S3) under visible light irradiation
复制标题
DOI：
10.1039/c6ra22546b
复制
发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Ohno, Teruhisa
中科院分区：
文献类型：
--
作者：
Kamimura, Sunao;Sasaki, Yousuke;Ohno, Teruhisa
采用不同n型缓冲层（CdS和In2S3）修饰的Cu2ZnSnS4（CZTS）电极作为光电阴极，在可见光（420 <λ <800 nm）照射下，在水溶液中还原CO2。与裸CZTS电极相比，用n型缓冲层（CdS和In2S3）修饰的CZTS电极，通过其在CZTS和n型缓冲层之间形成p-n异质结，显示出分配给CO2还原的光电流的显著增加。此外，通过用n型缓冲层进行表面改性来提高CO2还原的产物选择性：即，通过使用CdS/CZTS电极实现选择性CO2还原成CO，而在In2S3/CZTS电极上观察到HCOOH选择性。在这项研究中，我们研究了与n型缓冲层（CdS和In2S3）结合的结构和光学性质的CZTS电极修饰的光电化学性质，我们研究了它们的PEC CO2还原活性。
Cu2ZnSnS4 (CZTS) electrodes modified with different n-type buffer layers (CdS and In2S3) were used as photocathodes for CO2 reduction under visible light irradiation (420 < lambda < 800 nm) in aqueous media. Compared to a bare CZTS electrode, CZTS electrodes modified with n-type buffer layers (CdS and In2S3), by which a p-n heterojunction between CZTS and the n-type buffer layer is formed, showed a significant increase in the photocurrent assigned to CO2 reduction. In addition, product selectivity of CO2 reduction was improved by surface modification with an n-type buffer layer: that is, selective CO2 reduction into CO was achieved by using a CdS/CZTS electrode, while HCOOH selectivity was observed over an In2S3/CZTS electrode. In this study, we investigated the photoelectrochemical properties of CZTS electrodes modified with n-type buffer layers (CdS and In2S3) in conjunction with the structural and optical properties, and we investigated their activity for PEC CO2 reduction.