Electrocatalytic reduction of nitric oxide on Pt nanocrystals of different shape in sulfuric acid solutions

被引：21

作者：

Cheng, Qian ^{[1
]}

Jiang, Yan-Xia ^{[1
]}

Tian, Na ^{[1
]}

Zhou, Zhi-You ^{[1
]}

Sun, Shi-Gang ^{[1
]}

机构：

[1] Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2010年 / 55卷 / 27期

关键词：

Pt tetrahexahedral nanocrystals; Pt nanothorns; Nitric oxide; Electrocatalytic reduction; In situ FTIRS; TRANSITION-METAL ELECTRODES; CRYSTAL PLATINUM-ELECTRODES; CLOSE-PACKED TRANSITION; NO ADLAYERS; ELECTROCHEMICAL CHARACTERIZATION; HYDROXYLAMINE ELECTROCHEMISTRY; POLYCRYSTALLINE PLATINUM; ABSORPTION-SPECTROSCOPY; NITRATE REDUCTION; ADSORBED NITRATE;

D O I：

10.1016/j.electacta.2010.06.045

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Pt tetrahexahedral (Pt-THH) nanocrystals enclosed with 24 {h k 0} facets Pt nanothorns (Pt-Thorn) with a high surface density of atomic steps and congeries of Pt nanoparticles (Pt-NP) were prepared and served as catalysts to study the electrocatalytic reduction of both adsorbed and solution nitric oxide The structure sensitivity for the reduction of a saturated NO adlayer on the Pt nanocrystals (NCs) of different shape was studied by cyclic voltammetry (CV) and in situ FTIR spectroscopy in sulphuric acid solutions The results revealed that two types of NO adsorbates can be reduced independently at separated potentials e the reduction of linear bonded NO (NOL) on the Pt-NP electrode gives rise to a current peak at -0 01 V (vs SCE) while the bridge adsorbed NO (NOB) yields a current peak at -0 08 V The in situ SNIFTIRS results confirmed the assignment of NO adsorbates i e the NOB species yielding a IR absorption bipolar band with its negative-going peak at 1636 cm(-1) and positive-going peak around 1610 cm(-1) and the NOL species giving rise to a bipolar band with its negative-going peak at 1809 cm(-1) and positive-going peak around 1720 cm(-1) It has determined that the NOL species can be preferentially formed on the Pt NCs with open surface structure i e the more open the surface structure of the Pt NCs the larger the relative quantity of NOL versus NOB It has also revealed that the Pt NCs with a high surface density of atomic steps exhibit superior electrocatalytic activity for the reduction of solution NO species The steady-state current density of NO reduction on Pt-THH NCs is 75-12 times as large as that on Pt-NP and that on Pt-Thorn is 2 5-4 times of that on Pt-NP in the reduction potential region of electrochemical dynamic control (C) 2010 Elsevier Ltd All rights reserved

引用

页码：8273 / 8279

页数：7

共 57 条

[1] Spectroscopic study of the nitric oxide adlayers formed from nitrous acid solutions on palladium-covered platinum single-crystal electrodes [J].