• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Enhancing Charge Separation in Metallic Photocatalysts: A Case Study of the Conducting Molybdenum Dioxide
【24h】

Enhancing Charge Separation in Metallic Photocatalysts: A Case Study of the Conducting Molybdenum Dioxide

机译：增强金属光催化剂中电荷的分离：以导电二氧化钼为例

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A new visible-light responsive metallic photocatalyst, nanostructured MoO2, has been discovered. The metallic nature of MoO2 is confirmed by valance X-ray photoelectron spectroscopy spectrum and theoretical calculations. However, MoO2 itself shows only moderate activity due to the serious charge recombination, a general disadvantage of metallic photocatalysts. The findings suggest that its effective charge diffusion length L-p is smaller than 1.0 nm while the separation efficiency (sep) is less than 10%. Therefore, only the periphery of the metallic MoO2 can effectively contribute to photocatalysis. This limitation is overcome by integrating MoO2 in a hydrothermal carbonation carbon (HTCC) matrix (mainly contains semiconductive polyfuran). This simple chemical modification brings two advantages: (i) an internal electric field is formed at the interface between MoO2 and HTCC due to their appropriate band alignment; (ii) the nanostructured MoO2 and the HTCC matrix are intertwined with each other intimately. Their small size and large contact area promote charge transfer, especially under the internal electric field. Therefore, the separation rate of photoexcited charge carrier in MoO2 is greatly enhanced. The activity increases by 2.4, 16.8, and 4.0 times in photocatalytic oxygen evolution, dyes degradation, and photoelectrochemicl cell, respectively. The new approach is helpful for further development of metallic photocatalysts.
机译：已经发现了一种新型的可见光响应性金属光催化剂，纳米结构的MoO2。 MoO2的金属性质通过价X射线光电子能谱和理论计算得到证实。然而，由于严重的电荷复合，MoO2本身仅显示中等活性，这是金属光催化剂的普遍缺点。该发现表明其有效电荷扩散长度L-p小于1.0nm，而分离效率（sep）小于10％。因此，仅金属MoO 2的外围可以有效地有助于光催化。通过将MoO2集成到水热碳化碳（HTCC）基质（主要包含半导体聚呋喃）中可以克服此限制。这种简单的化学修饰具有两个优点：（i）由于MoO2和HTCC的适当能带对准，在MoO2和HTCC之间的界面处形成了内部电场； （ii）纳米结构的MoO2和HTCC基质紧密缠绕在一起。它们的小尺寸和大接触面积促进电荷转移，尤其是在内部电场下。因此，大大提高了MoO2中光激发载流子的分离率。在光催化氧释放，染料降解和光电化学细胞中，该活性分别提高了2.4倍，16.8和4.0倍。这种新方法有助于进一步开发金属光催化剂。

著录项

  • 来源
    《Advanced Functional Materials》 |2016年第25期|4445-4455|共11页
  • 作者

    Hu Zhuofeng; Liu Gang; Chen Xingqiu; Shen Zhurui; Yu Jimmy C.;

  • 作者单位

    Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China|Chinese Univ Hong Kong, Shenzhen Res Inst, Shenzhen, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China;

    Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China|Tianjin Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Ceram & Machining Technol, Tianjin 300072, Peoples R China|Chinese Univ Hong Kong, Shenzhen Res Inst, Shenzhen, Peoples R China;

    Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China|Chinese Univ Hong Kong, Shenzhen Res Inst, Shenzhen, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    charge separation; HTCC; metallic photocatalysts; MoO2;

    机译：电荷分离HTCC金属光催化剂MoO2;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号