Effect of iron addition to the electrolyte on alkaline water electrolysis performance

Maximilian Demnitz; Yuran Martins Lamas; Rodrigo Lira Garcia Barros; A.W.N. de Leeuw den Bouter; John van der Schaaf; M.T. (Thijs) de Groot

doi:10.1016/j.isci.2023.108695

Effect of iron addition to the electrolyte on alkaline water electrolysis performance

Maximilian Demnitz (Corresponding author), Yuran Martins Lamas, Rodrigo Lira Garcia Barros, A.W.N. de Leeuw den Bouter, John van der Schaaf, M.T. (Thijs) de Groot

Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review

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Improvement of alkaline water electrolysis is a key enabler for quickly scaling up green hydrogen production. Fe is omnipresent within most industrial alkaline water electrolyzers and its effect on electrolyzer performance needs to be assessed. We conducted three-electrode and flow cell experiments with electrolyte Fe and Ni electrodes. Three-electrode cell experiments show that Fe ([Fe] = 6–357 μM; ICP-OES) promotes HER and OER by lowering both overpotentials by at least 100 mV at high current densities (T = 35°C–91°C). The overpotential of a zero-gap flow cell was decreased by 200 mV when increasing the Fe concentration ([Fe] = 13–549 μM, T = 21°C–75°C). HER benefits from the formation of Fe dendrite layers (SEM/EDX, XPS), which prevent NiHx formation and increase the overall active area. The OER benefits from the formation of mixed Ni/Fe oxyhydroxides leading to better catalytic activity and Tafel slope reduction.

Originele taal-2	Engels
Artikelnummer	108695
Aantal pagina's	17
Tijdschrift	iScience
Volume	27
Nummer van het tijdschrift	1
DOI's	https://doi.org/10.1016/j.isci.2023.108695
Status	Gepubliceerd - 19 jan. 2024

Financiering

We gratefully acknowledge the funding by the NWO (KICH1.ED04.20.001). Further, we would like to acknowledge the experimental work performed by the TU/e DBL students and the help from the technicians of the Sustainable Process Engineering group.

Financiers	Financiernummer
Nederlandse Organisatie voor Wetenschappelijk Onderzoek	KICH1.ED04.20.001

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title = "Effect of iron addition to the electrolyte on alkaline water electrolysis performance",

abstract = "Improvement of alkaline water electrolysis is a key enabler for quickly scaling up green hydrogen production. Fe is omnipresent within most industrial alkaline water electrolyzers and its effect on electrolyzer performance needs to be assessed. We conducted three-electrode and flow cell experiments with electrolyte Fe and Ni electrodes. Three-electrode cell experiments show that Fe ([Fe] = 6–357 μM; ICP-OES) promotes HER and OER by lowering both overpotentials by at least 100 mV at high current densities (T = 35°C–91°C). The overpotential of a zero-gap flow cell was decreased by 200 mV when increasing the Fe concentration ([Fe] = 13–549 μM, T = 21°C–75°C). HER benefits from the formation of Fe dendrite layers (SEM/EDX, XPS), which prevent NiHx formation and increase the overall active area. The OER benefits from the formation of mixed Ni/Fe oxyhydroxides leading to better catalytic activity and Tafel slope reduction.",

keywords = "Fe, iron, Electrolysers, electrolysis, Alkaline, hydrogen, oxygen, performance, Electrolytes, Electrochemistry, Applied sciences",

author = "Maximilian Demnitz and {Martins Lamas}, Yuran and {Lira Garcia Barros}, Rodrigo and {de Leeuw den Bouter}, A.W.N. and {van der Schaaf}, John and {de Groot}, {M.T. (Thijs)}",

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AU - Demnitz, Maximilian

AU - Martins Lamas, Yuran

AU - Lira Garcia Barros, Rodrigo

AU - de Leeuw den Bouter, A.W.N.

AU - van der Schaaf, John

AU - de Groot, M.T. (Thijs)

PY - 2024/1/19

Y1 - 2024/1/19

N2 - Improvement of alkaline water electrolysis is a key enabler for quickly scaling up green hydrogen production. Fe is omnipresent within most industrial alkaline water electrolyzers and its effect on electrolyzer performance needs to be assessed. We conducted three-electrode and flow cell experiments with electrolyte Fe and Ni electrodes. Three-electrode cell experiments show that Fe ([Fe] = 6–357 μM; ICP-OES) promotes HER and OER by lowering both overpotentials by at least 100 mV at high current densities (T = 35°C–91°C). The overpotential of a zero-gap flow cell was decreased by 200 mV when increasing the Fe concentration ([Fe] = 13–549 μM, T = 21°C–75°C). HER benefits from the formation of Fe dendrite layers (SEM/EDX, XPS), which prevent NiHx formation and increase the overall active area. The OER benefits from the formation of mixed Ni/Fe oxyhydroxides leading to better catalytic activity and Tafel slope reduction.

AB - Improvement of alkaline water electrolysis is a key enabler for quickly scaling up green hydrogen production. Fe is omnipresent within most industrial alkaline water electrolyzers and its effect on electrolyzer performance needs to be assessed. We conducted three-electrode and flow cell experiments with electrolyte Fe and Ni electrodes. Three-electrode cell experiments show that Fe ([Fe] = 6–357 μM; ICP-OES) promotes HER and OER by lowering both overpotentials by at least 100 mV at high current densities (T = 35°C–91°C). The overpotential of a zero-gap flow cell was decreased by 200 mV when increasing the Fe concentration ([Fe] = 13–549 μM, T = 21°C–75°C). HER benefits from the formation of Fe dendrite layers (SEM/EDX, XPS), which prevent NiHx formation and increase the overall active area. The OER benefits from the formation of mixed Ni/Fe oxyhydroxides leading to better catalytic activity and Tafel slope reduction.

KW - Fe

KW - iron

KW - Electrolysers

KW - electrolysis

KW - Alkaline

KW - hydrogen

KW - oxygen

KW - performance

KW - Electrolytes

KW - Electrochemistry

KW - Applied sciences

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VL - 27

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Effect of iron addition to the electrolyte on alkaline water electrolysis performance

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