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Textured NiSe(2) Film: Bifunctional Electrocatalyst for Full Water Splitting at Remarkably Low Overpotential with High Energy Efficiency

Herein we have shown that electrodeposited NiSe(2) can be used as a bifunctional electrocatalyst under alkaline conditions to split water at very low potential by catalyzing both oxygen evolution and hydrogen evolution reactions at anode and cathode, respectively, achieving a very high electrolysis...

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Autores principales: Swesi, Abdurazag T., Masud, Jahangir, Liyanage, Wipula P. R., Umapathi, Siddesh, Bohannan, Eric, Medvedeva, Julia, Nath, Manashi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5445097/
https://www.ncbi.nlm.nih.gov/pubmed/28546568
http://dx.doi.org/10.1038/s41598-017-02285-z
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author Swesi, Abdurazag T.
Masud, Jahangir
Liyanage, Wipula P. R.
Umapathi, Siddesh
Bohannan, Eric
Medvedeva, Julia
Nath, Manashi
author_facet Swesi, Abdurazag T.
Masud, Jahangir
Liyanage, Wipula P. R.
Umapathi, Siddesh
Bohannan, Eric
Medvedeva, Julia
Nath, Manashi
author_sort Swesi, Abdurazag T.
collection PubMed
description Herein we have shown that electrodeposited NiSe(2) can be used as a bifunctional electrocatalyst under alkaline conditions to split water at very low potential by catalyzing both oxygen evolution and hydrogen evolution reactions at anode and cathode, respectively, achieving a very high electrolysis energy efficiency exceeding 80% at considerably high current densities (100 mA cm(−2)). The OER catalytic activity as well as electrolysis energy efficiency surpasses any previously reported OER electrocatalyst in alkaline medium and energy efficiency of an electrolyzer using state-of-the-art Pt and RuO(2) as the HER and OER catalyst, respectively. Through detailed electrochemical and structural characterization, we have shown that the enhanced catalytic activity is attributed to directional growth of the electrodeposited film that exposes a Ni-rich lattice plane as the terminating plane, as well as increased covalency of the selenide lattice which decreases the Ni(II) to Ni(III) oxidation potential. Thereby, the high efficiency along with extended stability makes NiSe(2) as the most efficient water electrolyzer known to-date.
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spelling pubmed-54450972017-05-30 Textured NiSe(2) Film: Bifunctional Electrocatalyst for Full Water Splitting at Remarkably Low Overpotential with High Energy Efficiency Swesi, Abdurazag T. Masud, Jahangir Liyanage, Wipula P. R. Umapathi, Siddesh Bohannan, Eric Medvedeva, Julia Nath, Manashi Sci Rep Article Herein we have shown that electrodeposited NiSe(2) can be used as a bifunctional electrocatalyst under alkaline conditions to split water at very low potential by catalyzing both oxygen evolution and hydrogen evolution reactions at anode and cathode, respectively, achieving a very high electrolysis energy efficiency exceeding 80% at considerably high current densities (100 mA cm(−2)). The OER catalytic activity as well as electrolysis energy efficiency surpasses any previously reported OER electrocatalyst in alkaline medium and energy efficiency of an electrolyzer using state-of-the-art Pt and RuO(2) as the HER and OER catalyst, respectively. Through detailed electrochemical and structural characterization, we have shown that the enhanced catalytic activity is attributed to directional growth of the electrodeposited film that exposes a Ni-rich lattice plane as the terminating plane, as well as increased covalency of the selenide lattice which decreases the Ni(II) to Ni(III) oxidation potential. Thereby, the high efficiency along with extended stability makes NiSe(2) as the most efficient water electrolyzer known to-date. Nature Publishing Group UK 2017-05-25 /pmc/articles/PMC5445097/ /pubmed/28546568 http://dx.doi.org/10.1038/s41598-017-02285-z Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Swesi, Abdurazag T.
Masud, Jahangir
Liyanage, Wipula P. R.
Umapathi, Siddesh
Bohannan, Eric
Medvedeva, Julia
Nath, Manashi
Textured NiSe(2) Film: Bifunctional Electrocatalyst for Full Water Splitting at Remarkably Low Overpotential with High Energy Efficiency
title Textured NiSe(2) Film: Bifunctional Electrocatalyst for Full Water Splitting at Remarkably Low Overpotential with High Energy Efficiency
title_full Textured NiSe(2) Film: Bifunctional Electrocatalyst for Full Water Splitting at Remarkably Low Overpotential with High Energy Efficiency
title_fullStr Textured NiSe(2) Film: Bifunctional Electrocatalyst for Full Water Splitting at Remarkably Low Overpotential with High Energy Efficiency
title_full_unstemmed Textured NiSe(2) Film: Bifunctional Electrocatalyst for Full Water Splitting at Remarkably Low Overpotential with High Energy Efficiency
title_short Textured NiSe(2) Film: Bifunctional Electrocatalyst for Full Water Splitting at Remarkably Low Overpotential with High Energy Efficiency
title_sort textured nise(2) film: bifunctional electrocatalyst for full water splitting at remarkably low overpotential with high energy efficiency
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5445097/
https://www.ncbi.nlm.nih.gov/pubmed/28546568
http://dx.doi.org/10.1038/s41598-017-02285-z
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