• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced energy materials >Porphyrin Conjugated Polymer Grafted onto BiVO_4 Nanosheets for Efficient Z-Scheme Overall Water Splitting via Cascade Charge Transfer and Single-Atom Catalytic Sites
【24h】

Porphyrin Conjugated Polymer Grafted onto BiVO_4 Nanosheets for Efficient Z-Scheme Overall Water Splitting via Cascade Charge Transfer and Single-Atom Catalytic Sites

机译：卟啉缀合的聚合物接枝到BIVO_4纳米片上，以通过级联电荷转移和单原子催化位分裂有效Z方案

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

This work shows a novel artificial Z-scheme photosystem based on a heterometallic Zn-/Pt-porphyrin conjugated polymer (ZnPtP-CP) grafted onto ultrathin BiVO4 nanosheets via Zn-O-V bridging bonds for high-efficiency overall water photosplitting. An impressive apparent quantum yield of 9.85% at lambda = 400 nm is achieved over the resulting ZnPtP-CP/BiVO4 composite, in which BiVO4 nanosheets are in close contact with ZnPtP-CP nanosheets via Zn-O-V bridging bonds to promote a Z-scheme charge transfer mechanism with ZnPtP-CP serving as electron-rich unit and BiVO4 as hole-rich one. The photoexcited electrons of BiVO4 transfer to the interface and recombine with the photogenerated holes of ZnPtP-CP through the Zn-O-V bonds, and thus the strong reducibility of the photoinduced electrons in ZnPtP-CP and the strong oxidation ability of the photogenerated holes in BiVO4 are maintained. Moreover, the highly dispersed Pt centers (PtN4) in Pt-porphyrin bridging units act as single-atom catalytic sites to facilitate a cascade charge transfer by fast migration of the photogenerated electrons from Zn-porphyrin to Pt-porphyrin units for the water reduction reaction. This Z-scheme mechanism with two-step excitation and cascade charge transfer pathway makes the composite acting as Z-scheme dual-function photocatalyst responsible for the efficient solar-driven overall water photosplitting without the aid of a sacrificial reagent or external bias.
机译：该工作显示了一种基于杂象Zn / Pt-pt-pt-pt-pothyrin共轭聚合物（ZnPTP-CP）的新型人工Z-SchemeS光系统，通过Zn-O-V桥接键接在超薄BIVO4纳米晶片上，用于高效整体水拍摄。在得到的ZnPTP-CP / Bivo4复合物中实现了λ= 400nm的令人印象深刻的表观量子产率为9.85％，其中BIVO4纳米晶片通过Zn-OV桥接键与ZnPTP-CP纳米片密切接触以促进Z方案用ZnPTP-CP充电机制用作电子富有的单元和BIVO4，为富有的孔。通过Zn-OV键将BiVo4的Bivo4转移到界面的光孔电子与ZnPTP-CP的光发性孔重新结合，因此在ZnPTP-CP中的光诱导电子和Bivo4中光发生孔的强氧化能力的强不可能保持。此外，Pt-卟啉桥接单元中的高度分散的PT中心（PTN4）充当单原子催化位点，以通过快速迁移来自Zn-卟啉的光生电子对水还原反应的Pt-卟啉单位来促进级联电荷转移。这种具有两步激励和级联电荷转移途径的Z形方案机理使得复合用作Z形方案双功能光催化剂，负责高效的太阳能驱动的整体水透视而不借助于牺牲试剂或外部偏压。

著录项

  • 来源
    《Advanced energy materials》 |2021年第7期|2003575.1-2003575.12|共12页
  • 作者

    Wang Jinming; Xu Lei; Wang Tingxia; Li Renjie; Zhang Yuexing; Zhang Jing; Peng Tianyou;

  • 作者单位

    Wuhan Univ Coll Chem & Mol Sci Engn Res Ctr Organosilicon Cpds & Mat Minist Educ Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Engn Res Ctr Organosilicon Cpds & Mat Minist Educ Wuhan 430072 Peoples R China|Wuhan Univ Shenzhen Res Inst Shenzhen 518057 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Engn Res Ctr Organosilicon Cpds & Mat Minist Educ Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Engn Res Ctr Organosilicon Cpds & Mat Minist Educ Wuhan 430072 Peoples R China;

    Hubei Univ Coll Chem & Chem Engn Wuhan 430062 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Engn Res Ctr Organosilicon Cpds & Mat Minist Educ Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Engn Res Ctr Organosilicon Cpds & Mat Minist Educ Wuhan 430072 Peoples R China|Wuhan Univ Shenzhen Res Inst Shenzhen 518057 Peoples R China;

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

    BiVO; (4) nanosheets; cascade charge transfer; overall water splitting; porphyrin conjugated polymers; Z#8208; scheme photocatalysts;

    机译：BIVO;（4）纳米液;级联电荷转移;总水分裂;卟啉共轭聚合物;Z-方案光催化剂;

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