光催化
石墨烯
催化作用
材料科学
异质结
化学工程
带隙
吸附
可见光谱
相(物质)
吸收(声学)
氧化物
化学
纳米技术
复合材料
光电子学
有机化学
工程类
冶金
作者
Gan Wang,Min Zhang,Juan Xiang,Chenchen Hu,Chao Yang,Xintai Su,Lijuan Zhang
标识
DOI:10.1016/j.jallcom.2021.162187
摘要
Pyrite (FeS2) is a promising photocatalyst because of its high optical absorption coefficient, suitable band gap and low cost. However, the low conductivity and weak stability of FeS2 limits its application. Herein, two-dimensional (2D) hetero-structured FeS2/reduced graphene (FeS2/rGO) photocatalyst was synthesized by a facile sodium-oleate-assisted two-phase solvothermal method. The optimized FeS2/rGO hybrids possessed excellent initial conversion frequency (TOF, 10.96 μmolO2 molmetal−1 s−1) and oxygen evolution amount (21.2 μmol), which was 2.5 times higher than of pure FeS2. Further studies revealed that the excellent catalytic property was attributed to the 2D heterojunction between FeS2 and rGO, which improved the optical adsorption of the hybrids and accelerated the rapid transfer of photogenerated charges from FeS2 surface to water molecules. The FeS2/rGO hybrids remained stable even after three runs photocatalytic reaction under the strong oxidation conditions. This study provides a facile strategy for the design of FeS2/rGO hybrids as a highly efficient water oxidation catalyst, improving the development of solar energy conversion.
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