Cobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer

Seawater splitting represents an inexpensive and attractive route for producing hydrogen, which does not require a desalination process. Highly active and durable electrocatalysts are required to sustain seawater splitting. Herein we report the phosphidation-based synthesis of a cobalt–iron–phosphat...

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Autores principales:	Chiho Kim, Seunghun Lee, Seong Hyun Kim, Jaehan Park, Shinho Kim, Se-Hun Kwon, Jong-Seong Bae, Yoo Sei Park, Yangdo Kim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	seawater splitting hydrogen evolution reaction cobalt-iron-phosphate electrocatalysts phosphidation hydrogen energy Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/1657c1fa74ad4d6abb445a0d2a613754
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spelling	oai:doaj.org-article:1657c1fa74ad4d6abb445a0d2a6137542021-11-25T18:31:27ZCobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer10.3390/nano111129892079-4991https://doaj.org/article/1657c1fa74ad4d6abb445a0d2a6137542021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2989https://doaj.org/toc/2079-4991Seawater splitting represents an inexpensive and attractive route for producing hydrogen, which does not require a desalination process. Highly active and durable electrocatalysts are required to sustain seawater splitting. Herein we report the phosphidation-based synthesis of a cobalt–iron–phosphate ((Co,Fe)PO<sub>4</sub>) electrocatalyst for hydrogen evolution reaction (HER) toward alkaline seawater splitting. (Co,Fe)PO<sub>4</sub> demonstrates high HER activity and durability in alkaline natural seawater (1 M KOH + seawater), delivering a current density of 10 mA/cm<sup>2</sup> at an overpotential of 137 mV. Furthermore, the measured potential of the electrocatalyst ((Co,Fe)PO<sub>4</sub>) at a constant current density of −100 mA/cm<sup>2</sup> remains very stable without noticeable degradation for 72 h during the continuous operation in alkaline natural seawater, demonstrating its suitability for seawater applications. Furthermore, an alkaline seawater electrolyzer employing the non-precious-metal catalysts demonstrates better performance (1.625 V at 10 mA/cm<sup>2</sup>) than one employing precious metal ones (1.653 V at 10 mA/cm<sup>2</sup>). The non-precious-metal-based alkaline seawater electrolyzer exhibits a high solar-to-hydrogen (STH) efficiency (12.8%) in a commercial silicon solar cell.Chiho KimSeunghun LeeSeong Hyun KimJaehan ParkShinho KimSe-Hun KwonJong-Seong BaeYoo Sei ParkYangdo KimMDPI AGarticleseawater splittinghydrogen evolution reactioncobalt-iron-phosphate electrocatalystsphosphidationhydrogen energyChemistryQD1-999ENNanomaterials, Vol 11, Iss 2989, p 2989 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	seawater splitting hydrogen evolution reaction cobalt-iron-phosphate electrocatalysts phosphidation hydrogen energy Chemistry QD1-999
spellingShingle	seawater splitting hydrogen evolution reaction cobalt-iron-phosphate electrocatalysts phosphidation hydrogen energy Chemistry QD1-999 Chiho Kim Seunghun Lee Seong Hyun Kim Jaehan Park Shinho Kim Se-Hun Kwon Jong-Seong Bae Yoo Sei Park Yangdo Kim Cobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer
description	Seawater splitting represents an inexpensive and attractive route for producing hydrogen, which does not require a desalination process. Highly active and durable electrocatalysts are required to sustain seawater splitting. Herein we report the phosphidation-based synthesis of a cobalt–iron–phosphate ((Co,Fe)PO<sub>4</sub>) electrocatalyst for hydrogen evolution reaction (HER) toward alkaline seawater splitting. (Co,Fe)PO<sub>4</sub> demonstrates high HER activity and durability in alkaline natural seawater (1 M KOH + seawater), delivering a current density of 10 mA/cm<sup>2</sup> at an overpotential of 137 mV. Furthermore, the measured potential of the electrocatalyst ((Co,Fe)PO<sub>4</sub>) at a constant current density of −100 mA/cm<sup>2</sup> remains very stable without noticeable degradation for 72 h during the continuous operation in alkaline natural seawater, demonstrating its suitability for seawater applications. Furthermore, an alkaline seawater electrolyzer employing the non-precious-metal catalysts demonstrates better performance (1.625 V at 10 mA/cm<sup>2</sup>) than one employing precious metal ones (1.653 V at 10 mA/cm<sup>2</sup>). The non-precious-metal-based alkaline seawater electrolyzer exhibits a high solar-to-hydrogen (STH) efficiency (12.8%) in a commercial silicon solar cell.
format	article
author	Chiho Kim Seunghun Lee Seong Hyun Kim Jaehan Park Shinho Kim Se-Hun Kwon Jong-Seong Bae Yoo Sei Park Yangdo Kim
author_facet	Chiho Kim Seunghun Lee Seong Hyun Kim Jaehan Park Shinho Kim Se-Hun Kwon Jong-Seong Bae Yoo Sei Park Yangdo Kim
author_sort	Chiho Kim
title	Cobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer
title_short	Cobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer
title_full	Cobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer
title_fullStr	Cobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer
title_full_unstemmed	Cobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer
title_sort	cobalt–iron–phosphate hydrogen evolution reaction electrocatalyst for solar-driven alkaline seawater electrolyzer
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1657c1fa74ad4d6abb445a0d2a613754
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Cobalt–Iron–Phosphate Hydrogen Evolution Reaction Electrocatalyst for Solar-Driven Alkaline Seawater Electrolyzer

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