• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS applied materials & interfaces >3D Nitrogen, Sulfur-Codoped Carbon Nanomaterial-Supported Cobalt Oxides with Polyhedron-Like Particles Grafted onto Graphene Layers as Highly Active Bicatalysts for Oxygen-Evolving Reactions
【24h】

3D Nitrogen, Sulfur-Codoped Carbon Nanomaterial-Supported Cobalt Oxides with Polyhedron-Like Particles Grafted onto Graphene Layers as Highly Active Bicatalysts for Oxygen-Evolving Reactions

机译：3D氮气，硫类碳纳米材料支撑的钴氧化物，其用多合体颗粒接枝到石墨烯层上，作为高活性的双催化剂用于氧化反应

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

The extensive research and developments of highly efficient oxygen electrode electrocatalysts to get rid of the kinetic barriers for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are very important in energy conversion and storage devices. Especially, exploring nonprecious metal alternatives to replace traditional noble metal catalysts with high cost and poor durability is the paramount mission. In this paper, we utilize property-flexible ZIF-67 and sulfur-functionalized graphene oxide to obtain a cobalt, nitrogen, and sulfur codoped nanomaterial with 3D hierarchical porous structures, owing to their rich dopant species and good conductivity. The crosslinked structures of polyhedron particles throughout the whole carbon framework speeds up the mass transportation and charge-delivery processes during oxygen-evolving reactions. Also, by exploring the location and coordination type of sulfur dopants, we emphasize the effects of sulfone and sulfide functional groups anchored into the graphitic structure on enhancing the catalytic abilities for ORR and OER. To note, compared to the noble metal electrocatalysts, the best-performing CoO@Co3O4/NSG-650 (0.79 V) is 40 mV less active than the commercial Pt/C catalyst (0.83 V) for ORR and merely 10 mV behind IrO2 (1.68 V) for OER. Besides, the metric between ORR and OER difference for CoO@Co3O4/NSG-650 to evaluate its overall electrocatalytic activity is 0.90 V, surpassing 290 and 430 mV over Pt/C (1.19 V) and IrO2 (1.33 V). Comprehensively, the as-prepared CoO@Co3O4/NSG-650 indicates excellent bifunctional catalytic activities for ORR and OER, which shows great potential for replacing noble metal catalysts in the application of fuel cells and metal air batteries.
机译：高效氧气电极电催化剂的广泛研发以摆脱氧还原反应的动力学屏障（ORR）和氧气进化反应（OER）在能量转换和储存装置中非常重要。特别是，探索具有高成本高昂和耐用性差的传统贵金属催化剂的非骄傲金属替代品是最重要的使命。在本文中，我们利用性能 - 柔性ZIF-67和硫磺官能化的石墨烯氧化物，得到钴，氮和硫的纳米材料，其具有富含掺杂剂物种和良好的导电性。在整个碳框架中的多层颗粒的交联结构在氧化反应期间加速质量运输和电荷输送过程。此外，通过探索硫掺杂剂的位置和协调类型，我们强调砜和硫化物官能团固定到石墨结构中的影响，提高ORR和OER的催化能力。要注意，与贵金属电催化剂相比，最佳性能的COO @ CO3O4 / NSG-650（0.79V）比商业Pt / C催化剂（0.83V）为ORR的40mV，并且仅仅在IRO2背后10 mV（ 1.68 v）oer。此外，COO @ CO3O4 / NSG-650的ORR和OER差异之间的度量是评估其整体电催化活性的0.90V，超过PT / C（1.19 V）和IRO2（1.33V）的290和430mV。全面地，AS制备的COO @ CO3O4 / NSG-650表明ORR和OER的优异的双官能催化活性，其显示出在燃料电池和金属空气电池的应用中更换贵金属催化剂的巨大潜力。

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