Construction of Z-scheme and p-n heterostructure: Three-dimensional porous g-C3N4/graphene oxide-Ag/AgBr composite for high-efficient hydrogen evolution
Construction of Z-scheme and p-n heterostructure: Three-dimensional porous g-C3N4/graphene oxide-Ag/AgBr composite for high-efficient hydrogen evolution
复制标题
Z型和p-n异质结构的构建：三维多孔g-C3N4/氧化石墨烯-Ag/AgBr复合材料用于高效析氢
DOI：
10.1016/j.apcatb.2019.118384
复制
发表时间：
2020-07-05
影响因子：
22.1
通讯作者：
Wang, Xuechuan
中科院分区：
文献类型：
--
作者：
Li, Wei;Wang, Xiao;Wang, Xuechuan
氢以其无污染、热值高的优点被誉为可替代的新能源，而光催化技术是近年来最有效的制氢手段之一。本课题针对传统光催化剂光响应差、光致载流子结合快、结构不稳定等问题，采用硬模板（SiO(2)纳米颗粒）法和选择性化学蚀刻方法，将二维氧化石墨烯与二维g-C3N4复合，构建了三维多孔g-C3N4/氧化石墨烯框架。然后，采用溶剂热法将优异的光敏剂溴化银纳米颗粒固定在三维多孔骨架上，构建了Ag等离子体三维多孔g-C3N4/氧化石墨烯- agbr光催化剂。研究表明，该新型光催化剂基于z -图式异质结构（GO-AgBr）、p-n异质结构（g- c3n4 - agbr）和Ag等离子体，在不含Pt共催化剂的情况下，具有较高的可见光析氢效率（3.69 mmol/g/h），高于大多数现有催化剂，且在活性和结构上具有较强的稳定性。因此，三维多孔骨架的高度有序结构和快速的界面电子传导、AgBr优异的光敏性以及Ag等离子体的协同效应是增强析氢和光稳定性的主要原因。因此，本研究为氢能的开发提供了一种有潜力的方法。
Hydrogen is known as an alternative new energy for its advantages of non-pollution and high calorific value, and photocatalysis technology is regarded as one of the most effective means to produce hydrogen in recent years. In this topic, aiming at the poor photoresponse, fast combination of photo-induced carriers and unstable structure of traditional photocatalysts, the three-dimensional porous g-C3N4/graphene oxide framework was constructed by compounding two-dimensional graphene oxide and two-dimensional g-C3N4 via hard template (SiO(2 )nanoparticles) method and selective chemical etching. Then, silver bromide nanoparticles, a superior photosensitizer, were immobilized on the three-dimensional porous framework to construct the three-dimensional porous g-C3N4/graphene oxide-AgBr photocatalyst with Ag plasmas by solvothermal method. Research showed that this novel photocatalyst based on Z-scheme heterostructure (GO-AgBr), p-n heterostructure (g-C3N4-AgBr) and Ag plasmas presented high-efficient visible-light driven hydrogen evolution (3.69 mmol/g/h) at the absence of Pt co-catalyst, which is higher than the majority of existing catalysts, and it also possessed strong stability on its activity and structure. Accordingly, the enhanced hydrogen evolution and photostability were attributed to the highly ordered structure and fast interfacial electron conduction of three-dimensional porous framework, superior photosensitivity of AgBr and synergistic effect of Ag plasmas. Therefore, this study provided a potential method for exploitation of hydrogen energy.