摻镍Pt(001)纳米多孔薄膜对甲醇的电催化氧化
首发时间:2017-09-21
摘要:本文采用磁控溅射法在MgO衬底上成功外延生长出Pt(001)纳米多孔薄膜。通过调控氧分压调控Pt薄膜的多孔率,对比研究了其对甲醇的电催化氧化效果。微结构观测发现,Pt(001)薄膜的多孔率随着氧分压的升高而逐渐增加,在45 %氧分压条件下Pt(001)薄膜形成三维网状孔洞结构。随着多孔率的提高,薄膜比表面积增大,同时Ni纳米颗粒在薄膜中的附着位点也大大增加,两者都有效增强了Pt(001)多孔薄膜对甲醇的催化作用:电流强度高达29mA/cm2并且得到超过1000秒的计时电流图,表明摻镍Pt(001)纳米多孔薄膜在甲醇催化领域方面的应用前景值得期待。
关键词: 外延多孔薄膜, 甲醇电催化 磁控溅射法
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Ni-modified Pt(001) porous film as an electrocatalyst for electrooxidation of methanol in alkaline media
Abstract:In this work, porous Pt (001) nanofilm modified with Ni nano-particles, grown on MgO substrate by magnetron sputtering, is studied as one of electrocatalytists for electrooxidation of methanol. Micro-structural characterizations reveal that the pores ratio of Pt(001) thin film increases with the increase of well-controlled oxygen fraction in the deposition ambient. Pt(001) thin film deposited with 45%-oxygen fraction exhibits percolating Pt networks infiltrated with interconnected nano-sized pores. After coating one layer of Ni nano-particles, the 45%-oxygen deposited Pt(001) porous film acts as an electrocatalyst for electrooxidation of methanol in alkaline media, a large catalytic current of 29mA/cm2 and a current-lasting time of more than 1000s are obtained, showing the promising applications of electrocatalyst for electrooxidation of methanol in DMFC field.
Keywords: epitaxial porous film electrocatalyst for methonal magnetron sputtering
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