Catalytic Surface Specificity of Ni(OH)2-Decorated Pt Nanocubes for the Hydrogen Evolution Reaction in an Alkaline Electrolyte

Youngmin Hong; Chang Hyuck Choi; Sang Il Choi

doi:10.1002/cssc.201901539

Catalytic Surface Specificity of Ni(OH)₂-Decorated Pt Nanocubes for the Hydrogen Evolution Reaction in an Alkaline Electrolyte

Youngmin Hong
, Chang Hyuck Choi
, Sang Il Choi

Kyungpook National University
Gwangju Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

Because the hydrogen evolution reaction (HER) in alkaline electrolyzers is initiated by water dissociation, the hydrogen evolution kinetics are sluggish even on highly active Pt catalysts. Here, we have synthesized Ni(OH)₂-decorated Pt nanocubes as a bifunctional catalyst to enhance the HER kinetics in an alkaline medium. Electrochemical cyclic voltammetry and CO-stripping measurements confirmed the selective deposition of Ni(OH)₂ on the Pt(1 0 0) facets of nanocubes. Electrocatalytic HER activity of the Ni(OH)₂-decorated Pt nanocubes demonstrated that the bifunctional catalytic surface promotes the Volmer step kinetics and thus the Volmer/Tafel coupling dominant. As the result, catalytic surface specificity of Ni(OH)₂-decorated Pt nanocubes enhanced water dissociation, reduced contamination of OH_ad on Pt surface, and maintained long-term HER performance in alkaline electrolytes.

Original language	English
Pages (from-to)	4021-4028
Number of pages	8
Journal	ChemSusChem
Volume	12
Issue number	17
DOIs	https://doi.org/10.1002/cssc.201901539
State	Published - 6 Sep 2019

Keywords

alkaline
bifunctional catalyst
hydrogen evolution
nickel hydroxide
platinum

Access to Document

10.1002/cssc.201901539

Cite this

@article{8dbd79f1b2f04da5a3719468ca225d72,

title = "Catalytic Surface Specificity of Ni(OH)2-Decorated Pt Nanocubes for the Hydrogen Evolution Reaction in an Alkaline Electrolyte",

abstract = "Because the hydrogen evolution reaction (HER) in alkaline electrolyzers is initiated by water dissociation, the hydrogen evolution kinetics are sluggish even on highly active Pt catalysts. Here, we have synthesized Ni(OH)2-decorated Pt nanocubes as a bifunctional catalyst to enhance the HER kinetics in an alkaline medium. Electrochemical cyclic voltammetry and CO-stripping measurements confirmed the selective deposition of Ni(OH)2 on the Pt(1 0 0) facets of nanocubes. Electrocatalytic HER activity of the Ni(OH)2-decorated Pt nanocubes demonstrated that the bifunctional catalytic surface promotes the Volmer step kinetics and thus the Volmer/Tafel coupling dominant. As the result, catalytic surface specificity of Ni(OH)2-decorated Pt nanocubes enhanced water dissociation, reduced contamination of OHad on Pt surface, and maintained long-term HER performance in alkaline electrolytes.",

keywords = "alkaline, bifunctional catalyst, hydrogen evolution, nickel hydroxide, platinum",

author = "Youngmin Hong and Choi, \{Chang Hyuck\} and Choi, \{Sang Il\}",

note = "Publisher Copyright: {\textcopyright} 2019 Wiley-VCH Verlag GmbH \& Co. KGaA, Weinheim",

year = "2019",

month = sep,

day = "6",

doi = "10.1002/cssc.201901539",

language = "English",

volume = "12",

pages = "4021--4028",

journal = "ChemSusChem",

issn = "1864-5631",

publisher = "Wiley-VCH Verlag",

number = "17",

}

TY - JOUR

T1 - Catalytic Surface Specificity of Ni(OH)2-Decorated Pt Nanocubes for the Hydrogen Evolution Reaction in an Alkaline Electrolyte

AU - Hong, Youngmin

AU - Choi, Chang Hyuck

AU - Choi, Sang Il

PY - 2019/9/6

Y1 - 2019/9/6

N2 - Because the hydrogen evolution reaction (HER) in alkaline electrolyzers is initiated by water dissociation, the hydrogen evolution kinetics are sluggish even on highly active Pt catalysts. Here, we have synthesized Ni(OH)2-decorated Pt nanocubes as a bifunctional catalyst to enhance the HER kinetics in an alkaline medium. Electrochemical cyclic voltammetry and CO-stripping measurements confirmed the selective deposition of Ni(OH)2 on the Pt(1 0 0) facets of nanocubes. Electrocatalytic HER activity of the Ni(OH)2-decorated Pt nanocubes demonstrated that the bifunctional catalytic surface promotes the Volmer step kinetics and thus the Volmer/Tafel coupling dominant. As the result, catalytic surface specificity of Ni(OH)2-decorated Pt nanocubes enhanced water dissociation, reduced contamination of OHad on Pt surface, and maintained long-term HER performance in alkaline electrolytes.

AB - Because the hydrogen evolution reaction (HER) in alkaline electrolyzers is initiated by water dissociation, the hydrogen evolution kinetics are sluggish even on highly active Pt catalysts. Here, we have synthesized Ni(OH)2-decorated Pt nanocubes as a bifunctional catalyst to enhance the HER kinetics in an alkaline medium. Electrochemical cyclic voltammetry and CO-stripping measurements confirmed the selective deposition of Ni(OH)2 on the Pt(1 0 0) facets of nanocubes. Electrocatalytic HER activity of the Ni(OH)2-decorated Pt nanocubes demonstrated that the bifunctional catalytic surface promotes the Volmer step kinetics and thus the Volmer/Tafel coupling dominant. As the result, catalytic surface specificity of Ni(OH)2-decorated Pt nanocubes enhanced water dissociation, reduced contamination of OHad on Pt surface, and maintained long-term HER performance in alkaline electrolytes.

KW - alkaline

KW - bifunctional catalyst

KW - hydrogen evolution

KW - nickel hydroxide

KW - platinum

UR - https://www.scopus.com/pages/publications/85070682356

U2 - 10.1002/cssc.201901539

DO - 10.1002/cssc.201901539

M3 - Article

C2 - 31286683

AN - SCOPUS:85070682356

SN - 1864-5631

VL - 12

SP - 4021

EP - 4028

JO - ChemSusChem

JF - ChemSusChem

IS - 17

ER -

Catalytic Surface Specificity of Ni(OH)₂-Decorated Pt Nanocubes for the Hydrogen Evolution Reaction in an Alkaline Electrolyte

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this