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A Highly Efficient Hydrogen Generation Electrolysis System using Alkaline Zinc Hydroxide Solution

Amini Horri, Bahman, Choolaei, Mohammadmehdi, Chaudhry, Aneeb and Qaalib, Hassan (2018) A Highly Efficient Hydrogen Generation Electrolysis System using Alkaline Zinc Hydroxide Solution International Journal of Hydrogen Energy.

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Abstract

Alkaline water electrolysis is a well-established conventional technique for hydrogen production. However, due to its relatively high energy consumption, the cost of hydrogen produced by this technique is still high. Here in this work, we report for the first time the application of alkaline zinc hydroxide solution (composed of sodium zincate and potassium zincate in NaOH and KOH solutions, respectively) as an efficient, simple and recursive electrolyte for producing clean hydrogen through a continuous dual-step electrolysis process. The ionic conductivity, electrodes current density, and hydrogen evolution rate were measured in a wide range of the electrolyte concentrations (0.1-0.59 M). Also, the cell efficiency was studied at different ranges of current density (0.09-0.25 A/cm2) and applied potential (1.8-2.2 V). Results indicated that the application of alkaline zinc hydroxide solution at the optimum electrolyte concentration can enhance the hydrogen evolution rate minimally by a factor of 2.74 (using sodium zincate) and 1.47 (using potassium zincate) compared to the conventional alkaline water electrolysers. The results of this study could be helpful to better understand the electrochemical behaviour of the alkaline water electrolysers when sodium zincate and potassium zincate are used as ionic activators for enhancing hydrogen evolution.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Amini Horri, Bahmanb.aminihorri@surrey.ac.uk
Choolaei, Mohammadmehdim.choolaei@surrey.ac.uk
Chaudhry, Aneeb
Qaalib, Hassan
Date : 2018
Identification Number : 10.1016/j.ijhydene.2018.03.048
Copyright Disclaimer : © 2015 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Hydrogen; Water Electrolysis; Alkaline Electrolyte; Sodium Zincate; Potassium Zincate; Ionic Activator
Depositing User : Clive Harris
Date Deposited : 15 Mar 2018 13:36
Last Modified : 09 Apr 2018 12:47
URI: http://epubs.surrey.ac.uk/id/eprint/846035

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