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ni-doped ZnCo2O4 atomic layers to boost the selectivity in solar-driven reduction of CO2

Nano Research 2018年第6期11卷 2897-2908页

作者： Katong Liu Xiaodong Li Liang Liang Ju Wu Xingchen Jiao Jiaqi Xu Yongfu Sun Yi Xie Hefei National Laboratory far Physical Sciences at Microscale CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei 230026 China

Regulating the selectivity of CO2 photoreduction is particularly challenging. Herein, we propose ideal models of atomic layers with/without element doping to investigate the effect of doping engineering to tune the selectivity of CO2 photoreduction. Prototypical ZnCo2O4 atomic layers with/without ni-doping were first synthesized. Density functional theory calculations reveal that introducing ni atoms creates several new energy levels and increases the density-of-states at the conduction band minimum. Synchrotron radiation photoemission spectroscopy demonstrates that the band structures are suitable for CO2 photoreduction, while the surface photovoltage spectra demonstrate that ni doping increases the carrier separation efficiency. In situ diffuse reflectance Fourier transform infrared spectra disclose that the CO2^- radical is the main intermediate, while temperature-programed desorption curves reveal that the ZnCo2O4 atomic layers with/without ni doping favor the respective CO and CH4 desorption. The ni-doped ZnCo2O4 atomic layers exhibit a 3.5-time higher CO selectivity than the ZnCo2O4 atomic layers. This work establishes a clear correlation between elemental doping and selectivity regulation for CO2 photoreduction, opening new possibilities for tailoring solar-driven photocatalytic behaviors.

关键词： atomic layers ni-doped zinc cobaltite selectivity of CO2 reduction

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Ferromagnetism of ni-doped ZnO Powders Prepared by Sol-Gel Method above Room Temperature

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Journal of Rare Earths 2006年第z1期24卷 186-188页

作者： Li Binbin Zhang Rong Xiu Xiangqian Tao Zhikuo Chen Lin Xie Zili Zheng Youdou Yu Huiqiang Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University Nanjing 210093 China Modern Analysis Center Nanjing University Nanjing 210093 China

The magnetic and structural properties of 2% ni-doped ZnO powers prepared by sol-gel method were studied. X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) of the sample do not show existence of any signal of second phase. The X-photoelectron spectroscopy (XPS) of the sample shows the chemical valence of ni is +2 and the real ni concentration is 2.19% determined by X-ray fluorescence spectra (XRFS). The magnetic property performed with superconducting quantum interference device (SQUID) shows that the sample exhibits ferromagnetism above room temperature and the Curie temperature (TC) is about 600 K.

关键词： sol-gel ni-doped ZnO powder ferromagnetism

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