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Microwave synthesis of chain-like zircona nanofibers through carbon-induced self-assembly growth

Frontiers of Materials Science 2017年第4期11卷 353-357页

作者： Wanyu ZHAO Jian LI Bingbing FAN Gang SHAO Hailong WANG Bozhen SONG Shengnan WEI Rui ZHANG School of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 China Henan Key Laboratory of Aeronautical Material and Application Technology Zhengzhou University of Aeronautics Zhengzhou 450046 China

Chain-like zircona （ZrO2） nanofibers were prepared by microwave sinter- ing without any surfactants or solid templates. Microwave sintering was conducted in a multimode microwave cavity with TE666 resonant mode at 2.45 GHz. Carbon particles were used to activate unique thermal processes when mixed with ZrO2 precursor. The sintering condition was at 1300℃ for 10 min. Samples were characterized by XRD, SEM, TEM techniques. It was found that both monolithic and tetragonal ZrO2 co-existed in samples prepared from the mixture of ZrO2 precursors and carbon by either microwave or conventional sintering. Only m-ZrO2 exists in samples prepared by ZrO2 precursors without carbon. ZrO2 appeared as chain-like nanofibers, which might be attributed to a so- called carbon-induced self-assembly growth mechanism.

关键词： ZrO2 chain-like nanofibers microwave sintering carbon-induced self-assembly growth

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Structural engineering of 3D hierarchical Cd0.8Zn0.2S for selective photocatalytic CO2 reduction

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Chinese Journal of Catalysis 2021年第1期42卷 131-140页

作者： Lei Cheng Dainan Zhang Yulong Liao Jiajie Fan Quanjun Xiang State Key Laboratory of Electronic Thin Film and Integrated Devices School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002HenanChina

The solar-driven catalytic conversion of CO2 to useful chemical fuels is regarded as an environmentally friendly approach to reduce the consumption of fossil fuels and mitigate the greenhouse ***,it is highly intriguing and challenging to promote the selectivity and efficiency of visible-light-responsive photocatalysts that favor the adsorption of CO2 in photoreduction *** this work,three-dimensional hierarchical Cd0.8Zn0.2S flowers(C8Z2S-F)with ultrathin petals were successfully synthesized through an in-situ self-assembly growth process using sodium citrate as a morphology *** flower-like Cd0.8Zn0.2S solid solution exhibited remarkable photocatalytic performance in the reduction of CO2,generating CO up to 41.4μmol g^−1 under visible-light illumination for 3 h;this was nearly three times greater than that of Cd0.8Zn0.2S nanoparticles(C8Z2S-NP)(14.7μmol g^−1).Particularly,a comparably high selectivity of 89.9%for the conversion of CO2 to CO,with a turnover number of 39.6,was obtained from the solar-driven C8Z2S-F system in the absence of any co-catalyst or sacrificial *** time-domain spectroscopy indicated that the introduction of flower structures enhanced the light-harvesting capacity of *** in situ diffuse reflectance infrared Fourier transform spectroscopy unveiled the existence of surface-adsorbed species and the conversion of photoreduction intermediates during the photocatalytic *** characterizations and predictions of the photocatalytic mechanism demonstrated that the flower-like Cd0.8Zn0.2S solid solution possessed desirable CO2 adsorption properties and an enhanced charge-transfer capability,thus providing a highly effective photocatalytic reduction of CO2.

关键词： Cd0.8Zn0.2S flowers self-assembly growth Photocatalytic CO2 reduction High selectivity Visible-light irradiation

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