Improvement in the durability of Pt electrocatalysts by coverage with silica layers
Improvement in the durability of Pt electrocatalysts by coverage with silica layers
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DOI：
10.1021/jp076120b
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发表时间：
2007-10
影响因子：
3.7
通讯作者：
S. Takenaka;H. Matsumori;Keizo Nakagawa;H. Matsune;E. Tanabe;M. Kishida
中科院分区：
文献类型：
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作者：
S. Takenaka;H. Matsumori;Keizo Nakagawa;H. Matsune;E. Tanabe;M. Kishida
通过利用3 - 氨丙基 - 三乙氧基硅烷和四乙氧基硅烷在含氢氧化铂的碳纳米管上连续水解，用二氧化硅层覆盖碳纳米管（CNT）负载的铂金属纳米粒子。将被二氧化硅层覆盖的碳纳米管负载铂金属粒子（记为SiO₂/Pt/CNT）用作电催化剂。SiO₂/Pt/CNT电催化剂在重复的电位循环实验中表现出高稳定性，而Pt/CNT电催化剂在该实验中由于铂金属粒子尺寸增大而严重失活。SiO₂/Pt/CNT中的二氧化硅层防止了铂金属粒子的溶解以及铂金属粒子在载体上的迁移和团聚，从而提高了Pt/CNT电催化剂的稳定性。
Carbon nanotube (CNT)-supported Pt metal nanoparticles were covered with silica layers by utilizing the successive hydrolysis of 3-aminopropyl-triethoxysilane and tetraethoxysilane on CNTs with Pt hydroxide. The CNT-supported Pt metal particles covered with silica layers (denoted as SiO2/Pt/CNT) were used as the electrocatalysts. SiO2/Pt/CNT electrocatalysts showed a high stability for the repeated potential cycling experiment, whereas Pt/CNT electrocatalysts were deactivated seriously for the experiment because of the growth of Pt metal particles in size. The silica layers in SiO2/Pt/CNT prevent the dissolution of Pt metal particles as well as the migration and agglomeration of Pt metal particles on the supports, which results in the improvement of the stability of Pt/CNT electrocatalysts.