...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Materials >Ultrafine Co Nanoparticles Encapsulated in Carbon- Nanotubes-Grafted Graphene Sheets as Advanced Electrocatalysts for the Hydrogen Evolution Reaction
【24h】

Ultrafine Co Nanoparticles Encapsulated in Carbon- Nanotubes-Grafted Graphene Sheets as Advanced Electrocatalysts for the Hydrogen Evolution Reaction

机译：碳纳米管接枝石墨烯片中包裹的超细Co纳米颗粒作为用于氢析出反应的高级电催化剂

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 rational design of an efficient and inexpensive electrocatalyst based on earth-abundant 3d transition metals (TMs) for the hydrogen evolution reaction still remains a significant challenge in the renewable energy area. Herein, a novel and effective approach is developed for synthesizing ultrafine Co nanoparticles encapsulated in nitrogen-doped carbon nanotubes (N-CNTs) grafted onto both sides of reduced graphene oxide (rGO) (Co@N-CNTs@rGO) by direct annealing of GO-wrapped core-shell bimetallic zeolite imidazolate frameworks. Benefiting from the uniform distribution of Co nanoparticles, the in-situ-formed highly graphitic N-CNTs@rGO, the large surface area, and the abundant porosity, the as-fabricated Co@N-CNTs@rGO composites exhibit excellent electrocatalytic hydrogen evolution reaction (HER) activity. As demonstrated in electrochemical measurements, the composites can achieve 10 mA cm(-2) at low overpotential with only 108 and 87 mV in 1 m KOH and 0.5 m H2SO4, respectively, much better than most of the reported Co-based electrocatalysts over a wide pH range. More importantly, the synthetic strategy is versatile and can be extended to prepare other binary or even ternary TMs@N-CNTs@rGO (e.g., Co-Fe@N-CNTs@rGO and Co-Ni-Cu@N-CNTs@rGO). The strategy developed here may open a new avenue toward the development of nonprecious high-performance HER catalysts.
机译：在可再生能源领域，合理设计一种基于高效稀土的3d过渡金属（TMs）进行放氢反应的电催化剂仍然是一项重大挑战。本文中，开发了一种新颖有效的方法，通过直接退火将合成的碳纳米管包裹在接枝到氧化石墨烯（rGO）（Co @ N-CNTs @ rGO）两侧的掺氮碳纳米管（N-CNT）中。 GO包裹的核-壳双金属沸石咪唑酯骨架。得益于Co纳米颗粒的均匀分布，原位形成的高石墨N-CNTs @ rGO，大表面积和丰富的孔隙率，制成的Co @ N-CNTs @ rGO复合材料表现出出色的电催化氢析出反应（HER）活性。如电化学测量所证明，在1m KOH和0.5m H2SO4中，该复合材料在低过电势下分别只有108和87 mV时可达到10 mA cm（-2），远优于大多数报道的Co基电催化剂pH范围宽。更重要的是，合成策略是通用的，可以扩展以制备其他二元甚至三元TMs @ N-CNTs @ rGO（例如，Co-Fe @ N-CNTs @ rGO和Co-Ni-Cu @ N-CNTs @ rGO ）。此处制定的策略可能会为开发非贵重的高性能HER催化剂开辟新的途径。

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