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Bridging localized electron states of pyrite-type C0S_(2) cocatalyst for activated solar H_(2) evolution

Nano Research 2022年第1期15卷 202-208页

作者： Hengming Huang Chen Xue Zhenggang Fang Zhiliang Wang Bin Luo Menglong Sun Ling Zhou Kan Hu Jiahui Kou Lianzhou Wang Chunhua Lu Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Jiangsu National Synergetic Innovation Center for Advanced MaterialsState Key Laboratory of Materials-Oriented Chemical EngineeringCollege of Materials Science and EngineeringNanjing Tech UniversityNanjing 211816China Nanomaterials Centre School of Chemical EngineeringAustralian Institute for Bioengineering and NanotechnologyThe University of QueenslandQLD 4072Australia Research Institute for electronic Science and Graduate School of Environmental Science Hokkaido UniversityHokkaido 001-0020Japan

The development of low-cost and high-active cocatalysts is one of the most significant links for photocatalytic water splitting.Herein,a novel strategy of electron delocalization modulation for transition metal sulfides has been developed by anion hybridization.P-modified CoS_(2)(CoS_(2)|P)nanocrystals were firstly fabricated via a gas-solid reaction and coupled with CdS nanorods to construct a composite catalyst for solar H2 evolution reaction(HER).The CdS/CoS_(2)|P catalyst shows an HER rate of 57.8 pmol h-1,which is 18 times that of the bare CdS,8 times that of the CdS/CoS2,and twice that of Pt/CdS.The reduced energy barrier and suppressed reverse reaction for HER on the catalyst have been predicted and explained by density functional theory(DFT)calculation.The underlying design strategy of novel cocatalysts by electron delocalization modulation may shed light on the rational development of other advanced catalysts for energy conversion.

关键词： anion hybridization electron states cocatalyst photocatalysis water splitting

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electron Raman scattering in semiconductor quantum well wire of cylindrical ring geometry

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Chinese Physics B 2015年第11期24卷 442-447页

作者： Re.Betancourt-Riera Ri.Betancourt-Riera J.M.Nieto Jalil R.Riera Instituto Tecnol ógico de Hermosillo.Avenida Tecnol ógico S/N Col.Sahuaro Departamento de Investigaci ón en Física Universidad de Sonora Tecnol ógico de Monterrey-Campus Sonora Norte.Bulevar Enrique Mazón López No.965

We study the electron states and the differential cross section for an electron Raman scattering process in a semi- conductor quantum well wire of cylindrical ring geometry. The electron Raman scattering developed here can be used to provide direct information about the electron band structures of these confinement systems. We assume that the system grows in a GaAs/Al0.35Ga0.65As matrix. The system is modeled by considering T = 0 K and also a single parabolic con- duction band, which is split into a sub-band system due to the confinement. The emission spectra are discussed for different scattering configurations, and the selection rules for the processes are also studied. Singularities in the spectra are found and interpreted.

关键词： electron states Raman scattering selection rules quantum well wires

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