选择性原子层沉积与液相合成相结合制备高性能Pd_3Au@Pt/C电催化剂
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- 英文论文题名：Synthesis of core/shell structured Pd_3Au@Pt/C with enhanced electrocatalytic activity by regioselective atomic layer deposition combined with a wet chemical method
- 论文作者：刘会园 ; 宋玉江
- 英文论文作者：Huiyuan Liu ; Yujiang Song ; Dalian University of Technology
- 年：2016
- 作者机构：大连理工大学化工学院;
- 论文关键词：核壳电催化剂 ; 原子层沉积 ; 氧还原反应 ; 甲酸氧化反应
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十九分会：电化学材料
- 语种：中文
- 分类号：O643.36
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十九分会 ; 电化学材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：136k
- 原文格式：D
- 会议级别：全国
摘要
由于核壳界面存在着几何效应和电子效应可以有效提高电催化剂的电化学性能,因此Pt基核壳电催化剂受到了广泛关注~([1])。例如,Pd_3Au@Pt/C表现出较优的氧还原活性和甲酸氧化活性~([2])。此外,将储量较少的Pt沉积在储量丰富的材料表面形成Pt的薄层有助于降低Pt的用量,实现Pt基电催化剂的商业化。我们采用选择性原子层沉积和液相合成相结合制备Pd_3Au@Pt/C核壳电催化剂。首先,采用相转移法制备金属载量约20 wt%的Pd_3Au/C(~4.7 nm);然后,利用选择性原子层沉积技术在Pd_3Au纳米颗粒表面沉积Pt薄层(低于1 nm),由于碳载体表面吸附的表面活性剂对Pt成核生长存在阻碍作用及Pd_3Au核对Pt前驱体的催化降解作用,Pt可选择性的沉积在Pd_3Au纳米颗粒表面。与商业Pt/C和Pd_3Au/C相比,Pd_3Au@Pt/C表现出较优的氧还原活性和甲酸氧化活性。
We report the synthesis of Pd_3Au@Pt/C by atomic layer deposition(ALD) combined with a wet chemical method. Initially, nearly uniform Pd_3Au nanoparticles(NPs)(~4.7 nm) supported on carbon with a loading of ~20 wt% were prepared by reducing metal complexes confined in reverse micelles adsorbed on carbon. Next, Pt thin layer(less than 1 nm) was selectively deposited on purified Pd_3Au particles instead of on carbon by regioselective ALD that likely arises from the coverage of nucleation sites on carbon by surfactant molecules in conjuction with catalytic decomposition of Pt precursor on Pd_3Au. Interestingly, Pd_3Au@Pt/C demonstrates a significantly improved electrocatalytic activity toward both formic acid oxidation reaction(FAOR) and oxygen reduction reaction(ORR) compared with Pd_3Au/C and state-of-the art Pt/C.
We report the synthesis of Pd_3Au@Pt/C by atomic layer deposition(ALD) combined with a wet chemical method. Initially, nearly uniform Pd_3Au nanoparticles(NPs)(~4.7 nm) supported on carbon with a loading of ~20 wt% were prepared by reducing metal complexes confined in reverse micelles adsorbed on carbon. Next, Pt thin layer(less than 1 nm) was selectively deposited on purified Pd_3Au particles instead of on carbon by regioselective ALD that likely arises from the coverage of nucleation sites on carbon by surfactant molecules in conjuction with catalytic decomposition of Pt precursor on Pd_3Au. Interestingly, Pd_3Au@Pt/C demonstrates a significantly improved electrocatalytic activity toward both formic acid oxidation reaction(FAOR) and oxygen reduction reaction(ORR) compared with Pd_3Au/C and state-of-the art Pt/C.
引文
[1]Zhang,J.;Vukmirovic,M.;Xu,Y.;Mavrikakis,M.;Adzic,R.Angew.Chem.Int.Ed.2005,44:2132.
[2]Li,H.;Yao,R.;Wang,D.;He,J.;Li,M.;Song,Y.J.Phys.Chem.C 2015,119:4052.
[2]Li,H.;Yao,R.;Wang,D.;He,J.;Li,M.;Song,Y.J.Phys.Chem.C 2015,119:4052.