Inter-plane heterojunctions within 2D/2D FeSe2/g-C3N4 nanosheet semiconductors for photocatalytic hydrogen generation
Inter-plane heterojunctions within 2D/2D FeSe2/g-C3N4 nanosheet semiconductors for photocatalytic hydrogen generation
复制标题
用于光催化制氢的 2D/2D FeSe2/g-C3N4 纳米片半导体内的面间异质结
DOI：
10.1016/j.apcatb.2019.118249
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发表时间：
2020-02-01
影响因子：
22.1
通讯作者：
Fan, Jun
中科院分区：
文献类型：
--
作者：
Jia, Jia;Sun, Wenjuan;Fan, Jun
开发和设计一种功能强大的用于分解水的制氢光催化剂对于实现太阳能到化学燃料的高效转换仍然是一个巨大的挑战。本论文通过在g-C3N4表面原位沉积FeSe2纳米片，合理地构建了二维FeSe2/g-C3N4平面间异质结构(2D/2D FeSe2/CNN)。15%FeSe_2/CNNS 2D/2D复合材料在Na2S/Na_2SO_3溶液中的最佳氢气生成速率为1655.6亩·h~(-1)·g~(-1)，分别是原始g-C_3N_4、FeSe_2和相应的0D/2D FeSe_2/CNNS纳米晶的2.65、1.73和1.19倍。这种显著的光催化性能的提高可以归因于高效的载流子迁移率，通过两电子/两步途径加速了过氧化氢的分解，以及g-C3N4和FeSe2纳米片之间形成的2D异质结界面接触。这项工作可以为设计原子级结构和界面2D纳米结来指导纳米复合材料中的电荷分离和输运提供新的见解。
Developing and designing a robust hydrogen generation photocatalyst for water splitting remains a huge challenge for realizing highly effective conversion of solar energy into chemical fuel. Herein, two-dimensional FeSe2/g-C3N4 inter-plane heterostructures (2D/2D FeSe2/CNNS) were rationally constructed via the in-situ deposition of FeSe2 nanosheets on the g-C3N4 surface. The resulting 15% FeSe2/CNNS 2D/2D composite exhibited an optimal H-2 generation rate of 1655.6 mu mol.h(-1).g(-1) in Na2S/Na2SO3 solution, being nearly 2.65, 1.73 and 1.19 times higher than that of pristine g-C3N4, FeSe2 and corresponding 0D/2D FeSe2/CNNS nanocrystals, respectively. Such remarkably improved photocatalytic performance could be ascribed to efficient charge carrier mobility, acceleration of H2O2 decomposition via a stepwise two-electron/two-step pathway, and the formed 2D heterojunction interfacial contact between g-C3N4 and FeSe2 nanosheets. This work can provide new insight for designing atomic-level structural and interfacial 2D nanojunctions to steer charge separation and transportation in the nanocomposite.