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| PtNi枝状纳米粒子的制备及电催化甲醇氧化性能研究 |
| Controllable synthesis of PtNi dendritic nanoparticles as efficient electrocatalysts for methanol oxidation reaction |
| 投稿时间：2024-08-11 |
| DOI： |
| 中文关键词: 催化 PtNi合金 枝状纳米粒子 自组装 甲醇氧化反应(MOR) |
| 英文关键词: catalysis PtNi alloy dendritic nanoparticle self-assembly methanol oxidation reaction (MOR) |
| 基金项目:陕西省教育厅科学研究计划项目(22JK0589, 23JK0696)；陕西省特支计划青年拔尖人才项目；西藏民族大学“青年学人培育计划”(22MDX01)；西藏民族大学科研启动费项目(RCYJ602109) |
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| 中文摘要: |
| 提高单位Pt原子的催化活性，减少催化剂中Pt的用量，是推动直接甲醇燃料电池商业化应用的有效策略之一。本研究利用初级PtNi纳米晶发生自组装，制备出三维多孔PtNi枝状纳米粒子(PtNi DNPs)，并采用TEM对其进行形貌和结构表征，分析生长机理。电化学测试结果表明，PtNi DNPs的电催化甲醇氧化反应(MOR)的质量比活性是商用Pt黑催化剂的3.5倍(488.5 mA/mgPt)，并且呈现出良好的催化耐久性。这是由于Ni的加入能够调节Pt的电子结构；同时，三维开放性多孔结构能够提高催化剂表面活性位点与反应物分子的接触几率，进而显著提高Pt的催化性能。本文为设计开发高活性、低成本的Pt基MOR催化剂提供了良好的思路。 |
| 英文摘要: |
| Enhancing the electrocatalytic activity of a Per-Pt-atom basis and reducing the necessary Pt usage is believed to be an effective strategy to promote the commercial application of direct methanol fuel cells. In this work, 3-dimensional porous PtNi dendritic nanoparticles (PtNi DNPs) were prepared by self-assembly of primary PtNi nanocrystals. The morphology and structure were characterized by TEM, and the growth mechanism was analyzed. The electrocatalytic performance of PtNi DNPs for methanol oxidation reaction (MOR) was studied. The PtNi DNPs showed 3.5-fold enhancement (488.5 mA/mgPt) in mass activity than commercial Pt and outstanding electrocatalytic durability for the MOR, which is benefiting from the electronic effects between Pt and Ni and the unique dendritic structure. The present results have provided a new synthesis strategy into the development of Pt-based catalysts for MOR with high catalytic activity and low-cost. |
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