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Synthesis of g‐C3N4/ZnGa1.9Al0.1O4 Heterojunction Using Narrow and Wide Band Gap Material for Enhanced Photoelectrochemical Water Splitting
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-01-09 , DOI: 10.1002/slct.201702879
M. Merajul Islam 1 , Rama D. Tentu 1 , Suddhasatwa Basu 1
Affiliation  

We fabricated visible‐light responsive g‐C3N4/ZnGa1.9Al0.1O4 heterojunction nanocomposites using narrow band gap g‐C3N4 and wide band gap mesoporous ZnGa1.9Al0.1O4 by thermolysis and hydrothermal methods. The charge‐transfer, electrons‐holes separation and its kinetics across the intimate interface of g‐C3N4/ZnGa1.9Al0.1O4 were systematically investigated using photoelectrochemical (PEC) measurements. The high‐resolution transmission electron microscopy (HR‐TEM) shows an intimate interface between g‐C3N4 and ZnGa1.9Al0.1O4 nanocrystals in the heterojunctions. The PEC measurements revealed higher photocurrent density towards water splitting in case of heterojunction prepared by thermolysis method compared to hydrothermal process without noble metal co‐catalyst with excellent stability. The remarkable water splitting activity is mainly ascribed to the least recombination rate of electrons and holes, facile kinetics and least charge‐transfer resistance. This is further confirmed by kinetic studies using Tafel slope and exchange‐current density data.

中文翻译:

利用窄带隙材料合成g‐C3N4 / ZnGa1.9Al0.1O4异质结以增强光电化学水分解

我们通过热解和水热法使用窄带隙g‐C 3 N 4和宽带隙介孔ZnGa 1.9 Al 0.1 O 4制备了可见光响应性g‐C 3 N 4 / ZnGa 1.9 Al 0.1 O 4异质结纳米复合材料。跨g‐C 3 N 4 / ZnGa 1.9 Al 0.1 O 4的紧密界面的电荷转移,电子空穴分离及其动力学使用光电化学(PEC)测量系统地进行了调查。高分辨率透射电子显微镜(HR-TEM)显示g‐C 3 N 4与ZnGa 1.9 Al 0.1 O 4之间的紧密界面异质结中的纳米晶体。PEC测量显示,与没有贵金属助催化剂且稳定性极好的水热法相比,通过热解方法制备的异质结情况下,水分解的光电流密度更高。显着的水分解活性主要归因于电子和空穴的最低复合率,易动力学和最低的电荷转移阻力。使用塔菲尔斜率和交换电流密度数据进行的动力学研究进一步证实了这一点。
更新日期:2018-01-09
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