硼掺杂碳化硅负载Pt催化剂的甲醇电催化氧化性能  

Boron-doped silicon carbide supported Pt catalyst for methanol electrooxidation

作　　者：董莉莉 童希立[1] 王英勇[1] 靳国强[1] 郭向云[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049

出　　处：《燃料化学学报》2014年第7期845-850,共6页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金青年科学基金(21203233);山西省青年科技研究基金(2013021011-6)

摘　　要：以硼掺杂碳化硅(B0.1SiC)为载体,采用循环伏安法在B0.1SiC载体上电沉积Pt纳米粒子制备了Pt/B0.1SiC催化剂。利用X射线光电子能谱、X射线衍射、氮气吸附-脱附、扫描电镜及透射电镜等测试方法对催化剂的晶型、表面性质及形貌进行了表征。结果表明,硼原子掺杂进入SiC晶格并取代了Si位点,使B0.1SiC载体的导电性增强;Pt纳米粒子均匀地分布在B0.1SiC载体上,平均粒径为2.7 nm。与相同条件下制备的Pt/SiC催化剂相比,Pt/B0.1SiC具有较大的电化学活性表面积、更高的甲醇催化氧化活性和稳定性。Boron-doped silicon carbide （B0.1SiC） synthesized by the carbothermal reduction method was used as support to prepare Pt/B0.1 SiC catalyst by cyclic voltammtric deposition of Pt nanoparticles. The crystal structure, surface property and morphology of the catalysts were studied with X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy techniques and N2 adsorption-desorption experiment. It is shown that B atoms have been incorporated into the SiC lattice sites by substituting Si, which increases the electrical conductivity of SiC. Pt nanoparticles uniformly dispersed on the Bo. 1 SiC support with an average size of 2.7 nm. The prepared Pt/B0.1 SiC had a larger electrochemically active area and exhibited higher electrocatalytic activity and stability for methanol oxidation than the Pt/SiC synthesized by the same method. This shows that B-doped SiC is a promising support for preparing high-performance methanol oxidation electrocatalysts.

关 键 词：甲醇电氧化 硼掺杂碳化硅 PT催化剂 

分 类 号：O643[理学—物理化学] O646[理学—化学]