Catalyst deposition on large electrodes in membrane alkaline water electrolysis

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Catalyst deposition on large electrodes in membrane alkaline water electrolysis

Popis výsledku v původním jazyce

In the last years, the world is shifting towards more ecological power production. One ofthe promising energy carriers is hydrogen. Alkaline water electrolysis is the mostdeveloped technology of water electrolysis for hydrogen production. It is still of interestfor researchers finding ways of further improvement of this technology. One of themajor steps is incorporation of anion-selective membranes instead of porousdiaphragms, this step allows for reduced temperature and concentration of the liquidelectrolyte to be used. Together with the cell separators, the electrode catalysts whichare not based on platinum-group metals are being developed. The deposition of thecatalysts on large-area electrodes is often disregarded.This work is focused on preparation of nickel-based mixed-metal oxides catalysts in formof a coating on nickel-foam electrodes with area of 78.5 cm2. The metals selected for thecatalyst synthesis were nickel with cobalt for anode, and nickel with iron for cathode.The precursors were precipitated in form of hydroxide or oxohydroxide by means ofcathodic alkaline precipitation on the surface of the nickel foam. The electrodes with thedeposited precursors were annealed at 325 °C for 4 hours which lead to the formation ofmixed-metal oxides.The prepared electrodes were tested in a single-cell membrane alkaline waterelectrolyser. Solution of 1 mol dm-3 KOH was used as the liquid electrolyte. The catalystsshowed higher activity for water electrolysis than bare nickel foam. The electrodes alsoshowed better stability at constant-current testing which lasted for 16 hours. Themethod of cathodic precipitation was shown as viable for preparation of large-areaelectrodes with catalysts.

Název v anglickém jazyce

Catalyst deposition on large electrodes in membrane alkaline water electrolysis

Popis výsledku anglicky

In the last years, the world is shifting towards more ecological power production. One ofthe promising energy carriers is hydrogen. Alkaline water electrolysis is the mostdeveloped technology of water electrolysis for hydrogen production. It is still of interestfor researchers finding ways of further improvement of this technology. One of themajor steps is incorporation of anion-selective membranes instead of porousdiaphragms, this step allows for reduced temperature and concentration of the liquidelectrolyte to be used. Together with the cell separators, the electrode catalysts whichare not based on platinum-group metals are being developed. The deposition of thecatalysts on large-area electrodes is often disregarded.This work is focused on preparation of nickel-based mixed-metal oxides catalysts in formof a coating on nickel-foam electrodes with area of 78.5 cm2. The metals selected for thecatalyst synthesis were nickel with cobalt for anode, and nickel with iron for cathode.The precursors were precipitated in form of hydroxide or oxohydroxide by means ofcathodic alkaline precipitation on the surface of the nickel foam. The electrodes with thedeposited precursors were annealed at 325 °C for 4 hours which lead to the formation ofmixed-metal oxides.The prepared electrodes were tested in a single-cell membrane alkaline waterelectrolyser. Solution of 1 mol dm-3 KOH was used as the liquid electrolyte. The catalystsshowed higher activity for water electrolysis than bare nickel foam. The electrodes alsoshowed better stability at constant-current testing which lasted for 16 hours. Themethod of cathodic precipitation was shown as viable for preparation of large-areaelectrodes with catalysts.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů