p-Si/W2C and p-Si/W2C/Pt Photocathodes for the Hydrogen Evolution Reaction

被引：75

作者：

Berglund, Sean P. ^{[1
]}

He, Huichao ^{[1
,5
]}

Chemelewski, William D. ^{[1
]}

Celio, Hugo ^{[3
,4
]}

Dolocan, Andrei ^{[3
,4
]}

Mullins, C. Buddie ^{[1
,2
]}

机构：

[1] Univ Texas Austin, Dept Chem Engn, Austin, TX 78712 USA

[2] Univ Texas Austin, Ctr Electrochem, Dept Chem & Biochem, Austin, TX 78712 USA

[3] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA

[4] Univ Texas Austin, Ctr Nano & Mol Sci, Austin, TX 78712 USA

[5] Chongqing Univ, Coll Chem & Chem Engn, Chongqing 400030, Peoples R China

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2014年 / 136卷 / 04期

基金：

美国国家科学基金会;

关键词：

TRANSITION-METAL CARBIDES; TUNGSTEN CARBIDE; ELECTROCATALYTIC ACTIVITY; BALLISTIC DEPOSITION; WATER; PLATINUM; FILMS; NANOPARTICLES; ELECTROLYSIS; OVERLAYERS;

D O I：

10.1021/ja411604k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

p-Si/W2C photocathodes are synthesized by evaporating tungsten metal in an ambient of ethylene gas to form tungsten semicarbide (W2C) thin films on top of p-type silicon (p-Si) substrates. As deposited the thin films contain crystalline W2C with a bulk W:C atomic ratio of approximately 2:1. The W2C films demonstrate catalytic activity for the hydrogen evolution reaction (HER), and p-Si/W2C photocathodes produce cathodic photocurrent at potentials more positive than 0.0 V vs RHE while bare p-Si photocathodes do not. The W2C films are an effective support for Pt nanoparticles allowing for a considerable reduction in Pt loading. p-Si/W2C/Pt photocathodes with Pt nanoparticles achieve photocurrent onset potentials and limiting photocurrent densities that are comparable to p-Si/Pt photocathodes with Pt loading nine times higher. This makes W2C an earth abundant alternative to pure Pt for use as an electrocatalyst on photocathodes for the HER.

引用

页码：1535 / 1544

页数：10

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