...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical chemistry chemical physics: PCCP >Hollow palladium nanospheres with porous shells supported on graphene as enhanced electrocatalysts for formic acid oxidation
【24h】

Hollow palladium nanospheres with porous shells supported on graphene as enhanced electrocatalysts for formic acid oxidation

机译：中空钯纳米球，多孔壳支撑在石墨烯上，作为甲酸氧化的增强电催化剂

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 hollow palladium nanospheres with the porous shell comprised of uniform 5 nm Pd nanoparticles (Pd NS-HP) have been synthesized successfully by employing a simple replacement process between PdCI4~(2-) ions and Co with the assistance of a structure-directing agent, polyvinyl pyrrolidone (PVP). Then, the obtained Pd NS-HP is supported on graphene nanosheets (GN) to prepare Pd NS-HP/GN composites by a wet-impregnation method. As the catalyst towards formic acid electrooxidation, the Pd NS-HP/GN composite exhibits a larger electrochemically active surface area, better electrocatalytic activity and better stability compared with Pd nanoparticles/graphene (Pd NP/GN) and commercial Pd/C catalysts. The enhancement in electrocatalytic performance of Pd NS-HP/GN is attributed to the abundant connected pore channels in the inner and exterior surfaces of Pd nanospheres, which could provide a large contact surface for adsorption and transmission of reactants, facilitating the oxidation of formic acid molecules on its surface and also improving the utilization of Pd metal. Moreover, the support of graphene could enhance the stability of the catalyst.
机译：通过在结构导向剂的帮助下，利用PdCl4〜（2-）离子和Co之间的简单置换过程，成功合成了具有由均匀的5 nm Pd纳米颗粒（Pd NS-HP）构成的多孔壳的空心钯纳米球。 ，聚乙烯吡咯烷酮（PVP）。然后，将获得的Pd NS-HP负载在石墨烯纳米片（GN）上，通过湿法浸渍法制备Pd NS-HP / GN复合材料。与Pd纳米颗粒/石墨烯（Pd NP / GN）和市售Pd / C催化剂相比，Pd NS-HP / GN复合物作为甲酸电氧化的催化剂，具有更大的电化学活性表面积，更好的电催化活性和更好的稳定性。 Pd NS-HP / GN的电催化性能增强归因于Pd纳米球内表面和外表面的大量连通的孔道，可以为反应物的吸附和传输提供较大的接触表面，从而促进甲酸的氧化分子在其表面上，还提高了钯金属的利用率。而且，石墨烯的载体可以增强催化剂的稳定性。

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