Hierarchical microarchitectures of AgGa1−xInxS2: Long chain alcohol assisted synthesis, band gap tailoring and photocatalytic activities of hydrogen generation
Hierarchical microarchitectures of AgGa1−xInxS2: Long chain alcohol assisted synthesis, band gap tailoring and photocatalytic activities of hydrogen generation
复制标题
DOI：
10.1016/j.ijhydene.2013.02.138
复制
发表时间：
2013-08
影响因子：
7.2
通讯作者：
Jingxue Sun;Gang Chen;Guihong Xiong;J. Pei;Hongjun Dong
中科院分区：
文献类型：
--
作者：
Jingxue Sun;Gang Chen;Guihong Xiong;J. Pei;Hongjun Dong
采用长链醇辅助水热法制备了增强型可见光催化剂AgGa1−xInxS2。用X射线衍射仪、扫描电子显微镜、紫外可见光谱和BET分析对产物的相结构、形貌、光学性质、能级和比表面积进行了表征。所得到的产品呈现出独特的层次化微结构，这种微结构是由微球和纳米片组成的。研究表明，长链醇(正戊醇和正庚醇)的引入是形成层次化微结构的关键。另一方面，从吸收边开始估算的AgGa1−xInxS2(x=0-1)的带隙能由2.71eV(x=010)降低到1.93eV(x=01e)。在可见光(λ>；400 nm)照射下考察了其析氢光催化活性。当In(X)为0.1时，析氢速率可达813μ/h，并考察了长链醇和Ga/In的作用。
An enhanced visible-light-driven photocatalyst, AgGa1−xInxS2, was prepared by a facile long chain alcohol assisted hydrothermal route. Phase structures, morphologies, optical properties, energy level and specific surface areas of the products were characterized by X-ray diffraction, scanning electron microscope, UV–vis spectra and BET analysis. The obtained products show unique hierarchical microarchitectures which were fabricated by micro-sphere and nano-sheets. The introducing of long chain alcohol (pentanol and heptanol) was investigated to be crucial for the forming of hierarchical microarchitectures. On the other hand, the band gap energy of AgGa1−xInxS2(x= 0–1) estimated from the onset of absorption edge was found to be reduced from 2.71 eV (x= 0) to 1.93 eV (x= 1) by indium substitution. The photocatalytic activity for hydrogen evolution was investigated under visible light irradiation (λ> 400 nm). The rate of hydrogen evolution reached up to 813 μmol/h when the amount of In (x) was 0.1 and the roles of long chain alcohol and Ga/In were also carefully investigated.