...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of industrial and engineering chemistry >Effective charge separation in rGO/NiWO4@Au photocatalyst for efficient CO2 reduction under visible light
【24h】

Effective charge separation in rGO/NiWO4@Au photocatalyst for efficient CO2 reduction under visible light

机译：RGO / NIWO4 @ Au光催化剂的有效电荷分离，可见光下的高效二氧化碳减少

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

Catalyst performance can be improved by introducing an electron donor into both the valence band (VB) and conduction band (CB) to facilitate charge separation and suppress electron-hole recombination. Herein, Au nanoparticles served as CB electron donors in NiWO4 core particles which were evenly dispersed on a reduced graphene oxide (rGO) sheet that served as a VB electron donor. The resulting rGO/NiWO4@Au photocatalyst was applied to reducing CO2. The particles exhibited broadband absorbance from the ultraviolet to near-infrared, with a specific Au surface plasmon resonance (SPR) absorption peak at 600 nm. Moreover, the catalyst exhibited low photoluminescence (PL) and a high photocurrent density, indicating that photo-excited electron-hole recombination was suppressed and the charges effectively separated. Photocatalytic reduction of CO2 on rGO/NiWO4@Au was significantly enhanced as evidenced by the total amounts of reduction products (co and CH4), which were 15 times those for NiWO4 and six times those for rGO/NiWO4 and NiWO4@Au. The expected electron-transfer mechanism on rGO/NiWO4@Au involves electron donation into the VB from the pi-electron rich rGO, combined with photoexcited electrons from the NiWO4 and Au particles where electrons on the Au surfaces were amplified by the SPR and then moved to the CB of NiWO4. Intensity-modulated photovoltage spectroscopy of rGO/NiWO4@Au indicated a significantly reduced electron-hole recombination rate. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：通过将电子供体引入价带（VB）和导带（CB），可以改善催化剂性能，以促进电荷分离和抑制电子 - 空穴重组。在此，Au纳米颗粒用作NiWO4核心颗粒中的Cb电子给体，其均匀地分散在用作VB电子给体的还原的氧化石墨烯（RGO）片上。将得到的rgo / NiwO4 @ Au光催化剂施加到还原二氧化碳。颗粒从紫外线到近红外宽带吸光度，具有600nm的特定Au表面等离子体共振（SPR）吸收峰。此外，催化剂表现出低光致发光（PL）和高光电流密度，表明抑制了光激发电子 - 空穴重组，并且有效地分离了电荷。 RGO / NiWO4 @ Au上的CO 2的光催化还原显着提高了通过减少产品（CO和CH4）的总量证明，这是NIWO4和RGO / Niwo4和Niwo4 @ Au的六倍的15倍。 Rgo / Niwo4 @ Au上的预期电子转移机制涉及来自富含PI-电子RGO的VB中的电子捐赠，与来自NiWO4和Au颗粒的光透射电子联系，其中Au表面上的电子被SPR放大，然后移动到NIWO4的CB。 RGO / NiWO4 @ Au的强度调制光伏光谱表明电子空穴复合率显着降低。 （c）2019年韩国工程化学学会。 elsevier b.v出版。保留所有权利。

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