| 翟虹,刘金成,甄华如,李春萍,白杰,徐广然.化学通报,2023,86(3):339-346. |
| Ce改性碳纳米管载过渡金属磷化物的制备与电催化性能研究 |
| Controllable construction and electrocatalytic properties of Transition metal phosphide supported on Ce modified carbon nanotubes |
| 投稿时间：2022-06-06 修订日期：2022-07-02 |
| DOI： |
| 中文关键词: 碳纳米管 稀土金属 析氢反应 析氧反应 电化学水分解 |
| 英文关键词:carbon nanotubes, rare earth metals, hydrogen evolution reaction, oxygen evolution reaction, electrochemical water splitting |
| 基金项目:内蒙古自然科学基金项目(2019BS02011)资助 |
|
| 摘要点击次数: 413 |
| 全文下载次数: 205 |
| 中文摘要: |
| 氢能是未来替代化石燃料的理想选择，可以通过电解水的半反应之一析氢反应制得，但其缓慢的反应动力学将会耗费大量的电池电压。因此，通过开发催化剂来降低电解槽的电压是解决这一问题的关键途径。本文构建了一种以稀土金属Ce改性的碳纳米管为载体，表面负载Cox-Moy-P纳米粒子（Cox-Moy-P@Ce-CNFs）的双功能电催化剂，分别对催化材料的析氢反应（HER）和析氧反应（OER）电催化活性进行了研究。结果表明，在1 M氢氧化钾电解液中，仅需要160 mV和323 mV的过电位就能达到10 mA cm-2的电流密度。将Cox-Moy-P@Ce-CNFs作为阴极和阳极材料组装为整体水电解槽，在电流密度为10 mA cm-2时，电解槽的电池电压为1.65 V，在电化学耐久性测试中能够稳定保持8小时。 |
| 英文摘要: |
| Due to the rapid consumption of fossil fuels, the issue of global climate change and energy crisis have attracted widespread attention. Hydrogen is an ideal energy to replace fossil fuels in the future. As one of the half-reactions of water electrolysis, the hydrogen evolution reaction has been proved to be a promising method for hydrogen production. But its slow reaction kinetics consume a lot of battery voltage. The voltage of the electrolytic cell can be reduced by developing cathode and anode catalysts, which can effectively promote the water electrolysis reaction. In this paper, rare earth metal cerium-modified carbon nanofibers were prepared by electrospinning and high-temperature carbonization technology and used as catalyst supports. Carbon fibers are etched into hollow tubular structures in a hydrothermal process. Carbon nanotubes can provide more active sites, continuous conductive pathways and excellent mass transfer channels. Two transition metal phosphides were supported on the surface of carbon nanotubes by hydrothermal method and high temperature phosphating method, and the obtained water electrolysis catalyst was named Cox-Moy-P@Ce-CNFs. The ceria in the support has more oxygen vacancy defects, showing excellent catalytic oxidation performance and oxygen utilization capacity. Moreover, Ce can exhibit various valence states due to its special electronic structure. Its multivalent nature can form interactions between metal-supports, which is beneficial to facilitate electron transfer and anchor metal particles, thereby enhancing catalytic activity and stability. The hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities of the catalytic samples were investigated, respectively. In 1M KOH electrolyte, Cox-Moy-P@Ce-CNFs exhibits small overpotential of 160 mV and 323 mV to achieve current density of 10 mA cm-2. And the catalyst still maintains excellent catalytic activity at high current density. Cox-Moy-P@Ce-CNFs were assembled as cathode and anode materials into a monolithic water electrolyzer. At current density of 10 mA cm-2, the cell voltage provided by the electrolyzer is 1.65 V. It is stable for 8 hours in the time-current response curve. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|