Construction of an Ultrathin S‐Scheme Heterojunction Based on Few‐Layer g‐C3N4 and Monolayer Ti3C2Tx MXene for Photocatalytic CO2 Reduction. Issue 2 (17th September 2020)

• Record Type: Journal Article
• Authors: Yang, Yali; Zhang, Dainan; Fan, Jiajie; Liao, Yulong; Xiang, Quanjun
• Other Names: Yu Jiaguo guestEditor.; Zhang Tierui guestEditor.; Wu Nianqiang guestEditor.
• Is Part Of: Solar RRL. Volume 5:Issue 2(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-17
• Subjects: g-C3N4 nanosheets -- monolayer Ti3C2Tx MXene -- photocatalytic CO2 reduction -- S-scheme heterojunctions; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202000351
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : As charge carriers transfer is critical for the photocatalytic activity enhancement of step‐scheme (S‐scheme) photocatalysts, facile construction of a S‐scheme heterojunction with great contact area and strong interaction between the compositions is highly desirable. Herein, an ultrathin S‐scheme heterojunction g‐C3 N4 /TiO2 /C (SL‐EAC) consisting of few‐layer g‐C3 N4 nanosheets on monolayer Ti3 C2 T x MXene converted TiO2 /C is prepared through an electrostatic self‐assembly and calcination method. The monolayer Ti3 C2 T x can not only prevent g‐C3 N4 from agglomerating through forming close contact with g‐C3 N4, but its conversion to TiO2 /C during calcination can build a bridge between the relatively inert TiO2 and multigroup‐terminated Ti3 C2 T x, which indirectly enhances the interface contact between TiO2 /C and g‐C3 N4 . SL‐EAC with a thickness of around 5 nm shows much better photocatalytic CO2 reduction performance than g‐C3 N4, TiO2 /C prepared by calcination of monolayer Ti3 C2 T x and g‐C3 N4 /TiO2 /C (EAC) prepared by the same method but monolayer Ti3 C2 T x is altered by multilayer Ti3 C2 T x . The excellent performance of SL‐EAC is attributed to the large contact area between g‐C3 N4 and TiO2 /C, which is conducive to the S‐scheme transfer of photogenerated charge carriers. Moreover, the samples prepared using different methods are also investigated, which further confirms the great contact area and strong interaction between the composites in ultrathin SL‐EAC. Abstract : An ultrathin S‐scheme heterojunction photocatalyst consisting of few‐layer g‐C3 N4 on monolayer Ti3 C2 T x converted TiO2 /C, prepared by an electrostatic self‐assembly and calcination method, shows high CO2 reduction performance.