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Construction of an Ultrathin S‐Scheme Heterojunction Based on Few‐Layer g‐C3N4 and Monolayer Ti3C2Tx MXene for Photocatalytic CO2 Reduction
Solar RRL ( IF 7.9 ) Pub Date : 2020-08-26 , DOI: 10.1002/solr.202000351
Yali Yang 1 , Dainan Zhang 1 , Jiajie Fan 2 , Yulong Liao 1 , Quanjun Xiang 1
Affiliation  

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‐C3N4/TiO2/C (SL‐EAC) consisting of few‐layer g‐C3N4 nanosheets on monolayer Ti3C2Tx MXene converted TiO2/C is prepared through an electrostatic self‐assembly and calcination method. The monolayer Ti3C2Tx can not only prevent g‐C3N4 from agglomerating through forming close contact with g‐C3N4, but its conversion to TiO2/C during calcination can build a bridge between the relatively inert TiO2 and multigroup‐terminated Ti3C2Tx, which indirectly enhances the interface contact between TiO2/C and g‐C3N4. SL‐EAC with a thickness of around 5 nm shows much better photocatalytic CO2 reduction performance than g‐C3N4, TiO2/C prepared by calcination of monolayer Ti3C2Tx and g‐C3N4/TiO2/C (EAC) prepared by the same method but monolayer Ti3C2Tx is altered by multilayer Ti3C2Tx. The excellent performance of SL‐EAC is attributed to the large contact area between g‐C3N4 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.

中文翻译:

基于少量g-C3N4和单层Ti3C2Tx MXene的超薄S型异质结的构建,用于光催化还原CO2

由于电荷载流子的转移对于逐步化学(S-scheme)光催化剂的光催化活性的提高至关重要,因此非常需要一种结构简单,接触面积大且组成之间相互作用强的S-cheme异质结。本文中,由单层Ti 3 C 2 T x MXene转化的TiO 2 / C组成的由几层g-C 3 N 4纳米片组成的超薄S型异质结g-C 3 N 4 / TiO 2 / C(SL-EAC)通过静电自组装和煅烧方法制备。单层Ti 3 C 2 T x不仅可以通过与g‐C 3 N 4形成紧密接触来防止g‐C 3 N 4发生团聚,而且在煅烧过程中将其转化为TiO 2 / C可以在相对惰性的TiO 2与多族终止的Ti 3之间建立桥梁。C 2 T x,间接增强了TiO 2 / C与g‐C 3 N 4的界面接触。厚度约为5 nm的SL‐EAC表现出比g‐C 3 N 4,TiO 2更好的光催化CO 2还原性能通过煅烧单层Ti 3 C 2 T x和通过相同方法制备的g‐C 3 N 4 / TiO 2 / C(EAC)制备的/ C,但通过多层Ti 3 C 2 T改变单层Ti 3 C 2 T x X。SL‐EAC的出色性能归因于g‐C 3 N 4与TiO 2之间的大接触面积/ C,这有助于光生载流子的S方案转移。此外,还研究了使用不同方法制备的样品,这进一步证实了超薄SL-EAC中复合材料之间的巨大接触面积和强相互作用。
更新日期:2020-08-26
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