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Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes

Mosaad Negem, Charlie Dunnill Orcid Logo, Kat Glover, Hashem Nady, Fakiha El-Taib Heakal Orcid Logo

Journal of Electroanalytical Chemistry, Volume: 942, Start page: 117549

Swansea University Authors: Charlie Dunnill Orcid Logo, Kat Glover

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DOI (Published version): 10.1016/j.jelechem.2023.117549

Abstract

Despite the importance of energy for our life, the rapid consumption of fossil fuels with human population growth worldwide is imperative to find other sustainable sources of energy. A promising strategy is to assess earth-abundant and inexpensive materials as electrocatalysts for efficient green hy...

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Published in: Journal of Electroanalytical Chemistry
ISSN: 1572-6657
Published: Elsevier BV 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa63522
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spelling v2 63522 2023-05-23 Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes 0c4af8958eda0d2e914a5edc3210cd9e 0000-0003-4052-6931 Charlie Dunnill Charlie Dunnill true false 9de84c29d678d5a7ad276b50bed6a5a2 Kat Glover Kat Glover true false 2023-05-23 CHEG Despite the importance of energy for our life, the rapid consumption of fossil fuels with human population growth worldwide is imperative to find other sustainable sources of energy. A promising strategy is to assess earth-abundant and inexpensive materials as electrocatalysts for efficient green hydrogen production. Herein, nanocrystalline Ni-Co-TiO2 electrodeposited films on copper that have different Co atomic ratios are exploited as target cathodes for hydrogen creation from acid and neutral electrolytes. Different characterization techniques were utilized to identify the chemical composition, morphological structure, crystal lattice system, and unit cell parameters of the obtained bimetals-metal oxide nanocomposites. Ultrasonication with mechanically stirred plating baths was used to ensure the homogenous inclusion of TiO2 nanoparticles inside the bimetallic texture. The electrocatalytic activity of hydrogen evolution reaction (HER) over the designed nanocrystalline cathodes was investigated using voltammetric polarization, chronoamperometry, and electrochemical impedance spectroscopy techniques. The results showed that Ni-Co-TiO2 nanocomposites with somewhat low Co contents (8-9 at.%) displayed superior electrocatalytic HER activity in acid and neutral phosphate buffer (PB) electrolytes, outperforming by many times the other benchmark electrocatalysts. In 0.5 M H2SO4 solution, the Ni-8.2Co-4.8TiO2 cathode demonstrated the highest catalytic activity for the HER, minimal overpotential of 223 mV to deliver a current density of 10 mA cm-2, and small Tafel slope of 74.3 mV dec-1. While the Ni-9.2Co-4TiO2 electrocatalyst required a slightly higher Tafel slope of 79.5 mV dec-1 and an overpotential of 279 mV to convey the same current density of 10 mA cm-2 in 1 M PB electrolyte. The impedance data further confirm these results as these two cathodes showed the lowest resistance for the charge transport process on their surfaces among the other tested ones. The study confirmed that abundant transition bimetals/metal oxide nanocomposites are among the most promising long time stability electrodes for large-scale economic hydrogen fuel production technologies. Journal Article Journal of Electroanalytical Chemistry 942 117549 Elsevier BV 1572-6657 1 8 2023 2023-08-01 10.1016/j.jelechem.2023.117549 http://dx.doi.org/10.1016/j.jelechem.2023.117549 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2023-09-04T12:25:56.4925305 2023-05-23T11:27:52.6271799 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Mosaad Negem 1 Charlie Dunnill 0000-0003-4052-6931 2 Kat Glover 3 Hashem Nady 4 Fakiha El-Taib Heakal 0000-0002-4398-6194 5
title Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes
spellingShingle Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes
Charlie Dunnill
Kat Glover
title_short Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes
title_full Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes
title_fullStr Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes
title_full_unstemmed Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes
title_sort Cost-effective electrodeposited Ni-Co-TiO2 electrodes for boosting hydrogen evolution reaction in acidic and neutral electrolytes
author_id_str_mv 0c4af8958eda0d2e914a5edc3210cd9e
9de84c29d678d5a7ad276b50bed6a5a2
author_id_fullname_str_mv 0c4af8958eda0d2e914a5edc3210cd9e_***_Charlie Dunnill
9de84c29d678d5a7ad276b50bed6a5a2_***_Kat Glover
author Charlie Dunnill
Kat Glover
author2 Mosaad Negem
Charlie Dunnill
Kat Glover
Hashem Nady
Fakiha El-Taib Heakal
format Journal article
container_title Journal of Electroanalytical Chemistry
container_volume 942
container_start_page 117549
publishDate 2023
institution Swansea University
issn 1572-6657
doi_str_mv 10.1016/j.jelechem.2023.117549
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
url http://dx.doi.org/10.1016/j.jelechem.2023.117549
document_store_str 0
active_str 0
description Despite the importance of energy for our life, the rapid consumption of fossil fuels with human population growth worldwide is imperative to find other sustainable sources of energy. A promising strategy is to assess earth-abundant and inexpensive materials as electrocatalysts for efficient green hydrogen production. Herein, nanocrystalline Ni-Co-TiO2 electrodeposited films on copper that have different Co atomic ratios are exploited as target cathodes for hydrogen creation from acid and neutral electrolytes. Different characterization techniques were utilized to identify the chemical composition, morphological structure, crystal lattice system, and unit cell parameters of the obtained bimetals-metal oxide nanocomposites. Ultrasonication with mechanically stirred plating baths was used to ensure the homogenous inclusion of TiO2 nanoparticles inside the bimetallic texture. The electrocatalytic activity of hydrogen evolution reaction (HER) over the designed nanocrystalline cathodes was investigated using voltammetric polarization, chronoamperometry, and electrochemical impedance spectroscopy techniques. The results showed that Ni-Co-TiO2 nanocomposites with somewhat low Co contents (8-9 at.%) displayed superior electrocatalytic HER activity in acid and neutral phosphate buffer (PB) electrolytes, outperforming by many times the other benchmark electrocatalysts. In 0.5 M H2SO4 solution, the Ni-8.2Co-4.8TiO2 cathode demonstrated the highest catalytic activity for the HER, minimal overpotential of 223 mV to deliver a current density of 10 mA cm-2, and small Tafel slope of 74.3 mV dec-1. While the Ni-9.2Co-4TiO2 electrocatalyst required a slightly higher Tafel slope of 79.5 mV dec-1 and an overpotential of 279 mV to convey the same current density of 10 mA cm-2 in 1 M PB electrolyte. The impedance data further confirm these results as these two cathodes showed the lowest resistance for the charge transport process on their surfaces among the other tested ones. The study confirmed that abundant transition bimetals/metal oxide nanocomposites are among the most promising long time stability electrodes for large-scale economic hydrogen fuel production technologies.
published_date 2023-08-01T12:25:58Z
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