Nanocrystalline Fe60Co20Si10B10 as a cathode catalyst for alkaline water electrolysis: Impact of surface activation

Nanocrystalline Fe60Co20Si10B10, prepared by ball milling atomised powder, was studied as a hydrogen evolution reaction catalyst for alkaline water electrolysis. Two application-oriented aspects of this material were studied: (i) Surface activation of the catalyst (cyclic voltammetry and leaching in...

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Bibliographic Details
Published in:Electrochimica acta 2019-05, Vol.306, p.688-697
Main Authors: Ďurovič, Martin, Hnát, Jaromír, Bernäcker, Christian Immanuel, Rauscher, Thomas, Röntzsch, Lars, Paidar, Martin, Bouzek, Karel
Format: Article
Language:English
Subjects:
Activation
Alkaline water electrolysis
Anion-selective polymer binder
Ball milling
Catalysis
Catalysts
Catalytic activity
Electrolysis
Fe60Co20Si10B10
Functional groups
Hydrogen evolution reaction
Hydrogen evolution reactions
Leaching
Nanocrystals
Non-platinum catalyst
Polystyrene resins
Potassium hydroxides
Recording
Stability tests
Surface activation
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Summary:Nanocrystalline Fe60Co20Si10B10, prepared by ball milling atomised powder, was studied as a hydrogen evolution reaction catalyst for alkaline water electrolysis. Two application-oriented aspects of this material were studied: (i) Surface activation of the catalyst (cyclic voltammetry and leaching in 1 mol dm−3 potassium hydroxide) and (ii) the composition of a catalyst layer (ratio of the amount of catalyst to the polymer binder). Polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene with DABCO functional groups (PSEBS-CM-DABCO) was used as an anion-selective binder. The catalytic activity of the material was evaluated by means of Tafel analysis and by recording load curves under alkaline water electrolysis conditions. The results revealed that both activation procedures increase the activity of the Fe60Co20Si10B10 catalyst by almost 50% compared to as-received material. The most suitable ratio of catalyst to binder was determined as 70:30. The catalyst remained stable and active in the stability test performed.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2019.03.107