...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS applied materials & interfaces >Cobalt-Phosphate Catalysts with Reduced Bivalent Co-Ion States and Doped Nitrogen Atoms Playing as Active Sites for Facile Adsorption, Fast Charge Transfer, and Robust Stability in Photoelectrochemical Water Oxidation
【24h】

Cobalt-Phosphate Catalysts with Reduced Bivalent Co-Ion States and Doped Nitrogen Atoms Playing as Active Sites for Facile Adsorption, Fast Charge Transfer, and Robust Stability in Photoelectrochemical Water Oxidation

机译：具有减少的二价共离子状态的钴 - 磷酸催化剂和掺杂的氮原子在光电化学水氧化中作为有效的吸附，快速电荷转移和鲁棒稳定性的活性位点

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 cobalt phosphate (Co-Pi) catalyst having octahedral CoO6 molecular units as reaction sites is a key component in photoelectrochemical (PEC) water oxidation systems, but its limited adsorption sites for oxygen evolving intermediates (*OH, *OOH), slow charge transfer rates, and fast degradation of reaction sites are yet to be overcome. Here, we report that Co-Pi nanoparticles with low-coordinate Co ions and doped nitrogen atoms could be decorated on hematite nanorod arrays to form N-CoPi/hematite composites. Moreover, the local atomic configuration and bond distance studies show that trivalent Co3+ states are partially reduced through nitrogen radicals in the plasma to low-coordinate bivalent Co2+ states playing as the facile adsorption sites of oxygen-evolving intermediates due to the decreased activation barrier for water oxidation. Electron transport is also reinforced by nitrogen species due to the formation of hybridizing N 2p orbitals that give the acceptor levels in the bandgap. As a result, both the incident photon-to-electron conversion efficiency and the charge transfer resistance on N-CoPi/hematite outperform those on a bare hematite by about 3 fold. Furthermore, N-CoPi/hematite gives high activity retention over 90% after the long operation of water oxidation, in support of the reaction sites on N-CoPi not degrading during the successive water oxidation.
机译：具有八面体CoO6分子单元作为反应位点的磷酸盐（Co-PI）催化剂是光电子化学（PEC）水氧化系统中的关键组分，但其用于氧不动的中间体的有限吸附位点（* OH，* OOH），慢电荷转移速度和反应位点的快速降解尚未克服。这里，我们报告说，具有低坐标Co离子和掺杂氮原子的Co-Pi纳米颗粒可以在赤铁矿纳米棒阵列上装饰，以形成N-COPI /赤铁矿复合材料。此外，局部原子构型和粘合距离研究表明，通过等离子体中的氮自由基部分地减小三价CO 3 +状态，以低坐标二价CO2 +状态，由于水的激活屏障降低，播放的中间体的容易吸附位点。氧化。由于形成带隙中的受体水平的杂交N 2P轨道，也是由于氮物质增强的电子传输。结果，在N-COPI /赤铁矿上的入射光态到电子转换效率和电荷传递电阻都优于裸赤铁矿的那些达到约3倍。此外，在水氧化长期后，N-Copi /赤铁矿在水氧化的长时间提供高90％的高活性保留，以在连续的水氧化期间N-COPI的反应位点载体。

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