...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Fabrication of nanocomposites composed of silver cyanamide and titania for improved photocatalytic hydrogen generation
【24h】

Fabrication of nanocomposites composed of silver cyanamide and titania for improved photocatalytic hydrogen generation

机译：制备由氰胺银和二氧化钛组成的纳米复合材料，以改善光催化氢的产生

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

Highly efficient composite photocatalysts composed of silver cyanamide (Ag2NCN) and anatase titania (TiO2) were fabricated through a chemical precipitation process of silver nitrate and cyanamide in TiO2 suspensions. The TiO2 nanoparticles around 15 nm were immobilized on the surface of rectangular Ag2NCN particles to form a hetero-structure, and the contents of TiO2 were varied to tune the structure and the photocatalytic performances. In comparison with single TiO2 or Ag2NCN, the TiO2/Ag2NCN nanocomposites exhibited a prominent improved photocatalytic activity in the hydrogen generation, and the hydrogen evolution rate (1494.0 mu mol (g h)(-1)) was higher than most of the reported TiO2-composite photocatalysts. Based on the structure investigation, the photocatalytic mechanism of these TiO2/Ag2NCN nanocomposites was proposed. The enhanced photocatalytic activity was attributed to three points: the matched energy level between TiO2 and Ag2NCN promoted the electron-hole transfer and thus inhibited the recombination of photogenerated electrons and holes; the great electron storage capacity of metallic silver produced in the photocatalytic process also facilitated the charge separation; in addition, the expanded absorption spectrum because of the composite structure enhanced the UV and visible light response ability. These TiO2/Ag2NCN nanocomposites also presented good photocatalytic stability in the typical cycle tests. This work provided new insights into fabricating highly efficient composite photocatalysts containing silver and TiO2 for hydrogen generation.
机译：通过硝酸银和氰胺在TiO2悬浮液中的化学沉淀过程，制备了由氰胺银（Ag2NCN）和锐钛矿二氧化钛（TiO2）组成的高效复合光催化剂。将15nm左右的TiO2纳米颗粒固定在矩形Ag2NCN颗粒表面形成异质结构，改变TiO2的含量以调节其结构和光催化性能。与单一的TiO2或Ag2NCN相比，TiO2 / Ag2NCN纳米复合材料在制氢方面表现出显着改善的光催化活性，并且析氢速率（1494.0μmol（gh）（-1））高于大多数报道的TiO2-复合光催化剂。在结构研究的基础上，提出了这些TiO2 / Ag2NCN纳米复合材料的光催化机理。增强的光催化活性归因于三点：TiO2和Ag2NCN的能级匹配促进了电子-空穴的转移，从而抑制了光生电子和空穴的复合。光催化过程中产生的金属银的巨大电子存储能力也促进了电荷分离。此外，由于复合结构而扩大的吸收光谱增强了紫外线和可见光的响应能力。这些TiO2 / Ag2NCN纳米复合材料在典型的循环测试中也表现出良好的光催化稳定性。这项工作为制造高效的包含银和TiO2的高效复合光催化剂以产生氢气提供了新见解。

著录项

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