Abstrakt: NiCoP Cathode Catalyst for Alkaline Electrolysis of Water: Structural and Electrochemical Characterisation

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

Abstrakt: NiCoP Cathode Catalyst for Alkaline Electrolysis of Water: Structural and Electrochemical Characterisation

Popis výsledku v původním jazyce

The combination of alkaline water electrolysis (AWE) with renewable energy sources (RES) is coming to the forefront of scientific interest due to the possibility to ecologically convert and store electrical energy into chemical energy of hydrogen. As AWE was originally designed for long-term stable operation, the above-mentioned combination with RES places new demands on the process (higher efficiency and flexibility). One way to improve the efficiency of the process is to find an available catalyst with good stability and catalytic activity for the hydrogen evolution reaction in an alkaline environment. Prospective materials besides metal alloys, sulphides, and selenides currently include nickel phosphide compounds. The main proposed reasons for the high activity are as follows: (i) The partially negative P atoms are able to weaken the H–OH bond, thus enhancing the water dissociation and subsequent adsorption of H atoms. (ii) In contrast to metal sulphides and selenides, the hydrogen evolution reaction is not limited to the sites of crystal edges and can also proceed on the bulk material surface. (iii) With a suitable atomic ratio of P and metal, the metal phosphides can exhibit excellent electronic conductivity.The aim of this work was the preparation and characterization of a non-platinum catalyst NiCoP. The synthesis was carried out by cathodic electrodeposition on a nickel support. The coating solution contained NiCl2·6H2O, CoCl2·6H2O, and NaH2PO2·H2O. The effect of the concentration of the individual components of the solution on the final composition (SEM-EDS, XPS, and TEM) and catalytic activity of the catalyst (Tafel analysis) was monitored. Structural analysis showed that a material with multiple phases is formed. The resulting composition and activity of the catalyst can thus be affected by changing the composition of the deposition solution. The results of electrochemical characterization showed that NiCoP represents a promising catalyst for the hydrogen evolution reaction. For its further use, it will be important to (i) identify the catalytically active phases, (ii) verify the long-term stability in alkaline media, and (iii) use the catalyst in the preparation of the cathode catalytic layer for an alkaline membrane water electrolyser.

Název v anglickém jazyce

Abstrakt: NiCoP Cathode Catalyst for Alkaline Electrolysis of Water: Structural and Electrochemical Characterisation

Popis výsledku anglicky

The combination of alkaline water electrolysis (AWE) with renewable energy sources (RES) is coming to the forefront of scientific interest due to the possibility to ecologically convert and store electrical energy into chemical energy of hydrogen. As AWE was originally designed for long-term stable operation, the above-mentioned combination with RES places new demands on the process (higher efficiency and flexibility). One way to improve the efficiency of the process is to find an available catalyst with good stability and catalytic activity for the hydrogen evolution reaction in an alkaline environment. Prospective materials besides metal alloys, sulphides, and selenides currently include nickel phosphide compounds. The main proposed reasons for the high activity are as follows: (i) The partially negative P atoms are able to weaken the H–OH bond, thus enhancing the water dissociation and subsequent adsorption of H atoms. (ii) In contrast to metal sulphides and selenides, the hydrogen evolution reaction is not limited to the sites of crystal edges and can also proceed on the bulk material surface. (iii) With a suitable atomic ratio of P and metal, the metal phosphides can exhibit excellent electronic conductivity.The aim of this work was the preparation and characterization of a non-platinum catalyst NiCoP. The synthesis was carried out by cathodic electrodeposition on a nickel support. The coating solution contained NiCl2·6H2O, CoCl2·6H2O, and NaH2PO2·H2O. The effect of the concentration of the individual components of the solution on the final composition (SEM-EDS, XPS, and TEM) and catalytic activity of the catalyst (Tafel analysis) was monitored. Structural analysis showed that a material with multiple phases is formed. The resulting composition and activity of the catalyst can thus be affected by changing the composition of the deposition solution. The results of electrochemical characterization showed that NiCoP represents a promising catalyst for the hydrogen evolution reaction. For its further use, it will be important to (i) identify the catalytically active phases, (ii) verify the long-term stability in alkaline media, and (iii) use the catalyst in the preparation of the cathode catalytic layer for an alkaline membrane water electrolyser.

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