pH effect on electrocatalytic reduction of CO2 over Pd and Pt nanoparticles

被引：60

作者：

Gao, Dunfeng ^{[1
,2
]}

Wang, Jing ^{[1
,2
]}

Wu, Haihua ^{[1
,2
]}

Jiang, Xiaole ^{[1
,2
]}

Miao, Shu ^{[3
]}

Wang, Guoxiong ^{[1
]}

Bao, Xinhe ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

[3] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2015年 / 55卷

基金：

中国国家自然科学基金;

关键词：

pH effect; Electrocatalytic reduction; Carbon dioxide; Palladium nanoparticles; Platinum nanoparticles; CARBON-DIOXIDE; ELECTROCHEMICAL REDUCTION; PALLADIUM ELECTRODES; HYDROGEN ABSORPTION; OXIDATION; EVOLUTION; ACID; SELECTIVITY; PLATINUM; ENERGY;

D O I：

10.1016/j.elecom.2015.03.008

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Adsorbed hydrogen participates in electrocatalytic reduction of CO2 and competitive hydrogen evolution reaction (HER) simultaneously, and its reaction pathway greatly affects the activity and selectivity of CO2 reduction. In this work, we investigate pH effect on electrocatalytic reduction of CO2 over Pd and Pt nanoparticles (NPs) with a similar size in a pH range from 1.5 to 4.2. Pt NPs completely contribute to HER in the pH range. Over Pd NPs, Faradaic efficiency for CO production at -1.19 V (vs. reversible hydrogen electrode) varies from 3.2% at pH of 1.5 to 93.2% at pH of 42, and current density for CO production reaches maximum at pH of 2.2. The significant enhancement of Faradaic efficiency and current density for CO production over Pd NPs at high pH values is attributed to decreased kinetics of hydrogen evolution reaction by increasing hydrogen binding energy and lowered adsorption affinity of CO-like intermediate compared to Pt. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：1 / 5

页数：5

共 23 条

[1] A CONTRIBUTION TO THE MECHANISM OF REDUCED CO2 ADSORBATES ELECTROOXIDATION FROM COMBINED SPECTROELECTROCHEMICAL AND VOLTAMMETRIC DATA [J].