Tuning electric conductivity of non-platinum catalysts for oxygen reduction reaction in alkaline fuel cell

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

Tuning electric conductivity of non-platinum catalysts for oxygen reduction reaction in alkaline fuel cell

Popis výsledku v původním jazyce

Oxygen reduction reaction (ORR) represents a crucial half-reaction in alkaline fuel cells (AFCs) due to complicated electron transfer and slow kinetic. Two main mechanisms of ORR are discussed in literature: i) two-electron pathway with hydrogen peroxide production as undesired intermediate and ii) direct four-electron pathway (Fig. 1). The prefered mechanism can be influenced by catalyst used. The main advantage of AFCs compares to competing technologies lies in the possibility to use non-platinum catalysts like transition metal oxides or alloys. Selenide-based catalysts represent promising candidates as cathodic non-Pt catalysts in AFCs due to their proper electrocatalytic activity, low price and simple preparation. However, these catalysts show low electrical conductivity and small surface area [1]. Many approaches for enhancing the electrical conductivity of catalysts are known [2]. The most applied approaches are: controlling the crystal structure of the material or using conductive support for the catalyst.Our study aimed to prepare a selenide-based Co0,83Ni0,17Se2 catalyst with enhanced electrical conductivity using conductive support. Parameters studied were: i) impact of carbon black (Cabot Vulcan XC72R) and ii) ratio of carbon support to catalyst. The morphology and physical properties were determined by SEM-EDS, XRD and BET analysis. Electrochemical properties were measured by linear sweep voltammetry and electrochemical impedance spectroscopy on rotating disk electrode in solution of 0,1 mol∙dm-3 KOH at 30 °C. Based on the results obtained, catalysts with carbon support exhibited highest electrical conductivity of all prepared materials.

Název v anglickém jazyce

Tuning electric conductivity of non-platinum catalysts for oxygen reduction reaction in alkaline fuel cell

Popis výsledku anglicky

Oxygen reduction reaction (ORR) represents a crucial half-reaction in alkaline fuel cells (AFCs) due to complicated electron transfer and slow kinetic. Two main mechanisms of ORR are discussed in literature: i) two-electron pathway with hydrogen peroxide production as undesired intermediate and ii) direct four-electron pathway (Fig. 1). The prefered mechanism can be influenced by catalyst used. The main advantage of AFCs compares to competing technologies lies in the possibility to use non-platinum catalysts like transition metal oxides or alloys. Selenide-based catalysts represent promising candidates as cathodic non-Pt catalysts in AFCs due to their proper electrocatalytic activity, low price and simple preparation. However, these catalysts show low electrical conductivity and small surface area [1]. Many approaches for enhancing the electrical conductivity of catalysts are known [2]. The most applied approaches are: controlling the crystal structure of the material or using conductive support for the catalyst.Our study aimed to prepare a selenide-based Co0,83Ni0,17Se2 catalyst with enhanced electrical conductivity using conductive support. Parameters studied were: i) impact of carbon black (Cabot Vulcan XC72R) and ii) ratio of carbon support to catalyst. The morphology and physical properties were determined by SEM-EDS, XRD and BET analysis. Electrochemical properties were measured by linear sweep voltammetry and electrochemical impedance spectroscopy on rotating disk electrode in solution of 0,1 mol∙dm-3 KOH at 30 °C. Based on the results obtained, catalysts with carbon support exhibited highest electrical conductivity of all prepared materials.

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