Activation Effect of Electrochemical Cycling on Gold Nanoparticles towards the Hydrogen Evolution Reaction in Sulfuric Acid

Activation Effect of Electrochemical Cycling on Gold Nanoparticles towards the Hydrogen Evolution Reaction in Sulfuric Acid

This article reports a study of electrochemical cycling effects on hydrogen evolution catalytic activity of gold nanoparticles in sulfuric acid. We found that after cycling within the double layer regime, up to 0.64 V vs RHE, there is a dramatic effect on the HER activity of gold nanoparticles: 128...

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Bibliographic Details
Main Authors: Ager III, Joel W., Xu, Zhichuan Jason, Wang, Ying, Sun, Yuanmiao, Liao, Hanbin, Sun, Shengnan, Li, Shuzhou
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2017
Subjects:
Electrocatalysis
Gold
Online Access:https://hdl.handle.net/10356/85617
http://hdl.handle.net/10220/43774
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Institution: Nanyang Technological University
Language: English
Description
Summary:This article reports a study of electrochemical cycling effects on hydrogen evolution catalytic activity of gold nanoparticles in sulfuric acid. We found that after cycling within the double layer regime, up to 0.64 V vs RHE, there is a dramatic effect on the HER activity of gold nanoparticles: 128 mV drop of the overpotential, a decrease of 23 mV/dec for the Tafel slope as well as a nearly twenty times increase of the turn-over frequency (TOF). This enhanced activity is tentatively assigned to the formation of stepped like structures by the consecutive electrochemical cycling in the double layer region.

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