高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (7): 1638-1644.doi: 10.7503/cjcu20200092

• 物理化学 • 上一篇    下一篇

分形等离激元黑金的热电子催化性能

余仁鹏,韩梅,张梦瑶,刘建芳,李末霞,胡家文*()   

  1. 湖南大学化学生物传感与计量学国家重点实验室, 湖南省二维材料重点实验室, 湖南大学化学化工学院, 长沙 410082
  • 收稿日期:2020-02-21 出版日期:2020-07-10 发布日期:2020-04-02
  • 通讯作者: 胡家文 E-mail:jwhu@hnu.edu.cn
  • 基金资助:
    国家自然科学基金(21673070);国家自然科学基金(21872047);厦门大学固体表面物理化学国家重点实验室开放课题(201913)

Fractal, Plasmonic Black Gold for Hot Electron Catalysis

YU Renpeng,HAN Mei,ZHANG Mengyao,LIU Jianfang,LI Moxia,HU Jiawen*()   

  1. State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan Key Laboratory of Two-dimensional Materials, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
  • Received:2020-02-21 Online:2020-07-10 Published:2020-04-02
  • Contact: HU Jiawen E-mail:jwhu@hnu.edu.cn
  • Supported by:
    † National Natural Science Foundation of China(21673070);National Natural Science Foundation of China(21872047);Open Project of Physics Chemical of Solid Surfaces from Xiamen University, China(201913)

摘要:

借鉴电镀工业中过电流“烧焦”现象, 在过电流沉积条件下一步制备出等离激元黑金. 扫描电子显微镜、 透射电子显微镜、 X射线衍射和紫外-可见-近红外吸收光谱等表征结果显示, 该黑金是具有三维分形结构的多晶纳米金, 可以在 400~1800 nm宽波段范围内吸收光. 电催化甲醇结果显示, 黑金在宽波长光照下可以将甲醇的电催化效率提高 15.2%, 其主要贡献来源于等离激元生成的热电子, 而一小部分来自环境热. 在不同的单色光照条件下, 黑金的催化效率差别不大, 表明其对光能的利用没有明显的波长选择性.

关键词: 等离激元, 黑金, 宽波段吸收, 热电子, 光催化

Abstract:

This study takes the advantage of the overcurrent “burning” phenomenon in electroplating industry to prepare plasmonic black gold using one-step overcurrent electrodeposition. The characterization results of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and ultraviolet-visible-near infrared absorption spectroscopy reveal that the black gold shows a three-dimensional fractal nanostructure composed of polycrystalline gold, which can absorb light over a broad-band range of 400—1800 nm. The results of methanol electrocatalytic oxidation show that the overall electrocatalytic efficiency of the black gold can be enhanced by 15.2% under light illumination from a Xe lamp, suggesting good hot electron catalytic activity. The improvement of the catalytic performance is mainly contributed to the plasmon-generated hot electrons, with minor contribution from the increased temperature. Under monochromatic light illumination with different wavelengthes, the black Au shows no obvious variation in the catalytic efficiency, suggesting its light utilization capability has no apparent dependence on the wavelength of the illumination light.

Key words: Plasmon, Black gold, Broad band absorption, Hot electron, Photocatalysis

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