Characterization of nanoporous nickel-based films on electrode materials for hydrogen evolution, fabricated by dealloying technique

• Autorzy: Bakr A. , El-Aziz Ahmed M. , Abdel-Karim R.

Identyfikatory

DOI

10.15199/40.2021.5.1

Warianty tytułu

PL

Charakterystyka nanoporowatych warstw niklowych na elektrodach do wydzielania wodoru, wytwarzanych na drodze selektywnego ługowania

• Języki publikacji: EN

Abstrakty

EN

Nanoporous nickel-based films, with a thickness of several μm have been fabricated on Ni substrate by electrodeposition of zinc, heat treatment of modified Zn-rich layer and by selective leaching of the active zinc metal from the electrode material substrate. The fabrication process involved three steps: (i) cathodic deposition of zinc on Ni substrate, (ii) heat treatment process of the surface layer and (iii) dealloying of zinc in alkaline solution on the electrochemical route. SEM and EDS analyses were carried out after each step of the fabrication process. The dealloyed film displays a porous structure with an average pore size of the order of 0.94μm. The electrocatalytic activity of the fabricated surface towards hydrogen evolution reaction (HER) was evaluated by cathodic polarization measurements and the results have been compared to these of pure nickel and commercial porous nickel foam surface. It has been concluded that the nanoporous nickel films fabricated by electrochemical dealloying revealed considerably higher electrocatalytic activity for HER process.

PL

Nanoporowate, warstwy na baize niklu, o grubościach kilku μm wytwarzano na podłożach niklowych poprzez elektroosadzanie cynku, obróbkę cieplną zmodyfikowanych warstw wzbogaconych cynkiem i przez selektywne ługowanie cynku z wytworzonych warstw powierzchniowych. Proces wytwarzania składał się z trzech etapów: (i) katodowego osadzania cynku na podlożu niklowym, (ii) obróbki cieplnej warstwy powierzchniowej i (iii) selektywnego wytrawiania cynku w roztworze alkalicznym na drodze elektrochemicznej. Po każdym etapie procesu wytwarzania przeprowadzano analize SEM i EDS zmodyfikowanej powierzchni. Wyługowane warstwy wykazują porowatą structure z średnimi rozmiarami porów na poziomie 0.94μm. Elektroaktywność katalityczną zmodyfikowanej powierzchni w odniesieniu do reakcji wydzielania wodoru oceniano w pomiarach katodowej polaryzacji a wyniki porównano dla podłoży czystego niklu i komercyjnego, porowatego niklu gąbczastego. Stwierdzono, że nanoporowate warstwy niklowe wytwarzane poprzez selektywne ługowanie wykazywały znacząco wyższą elektroaktywność katalityczną w odniesieniu do reakcji wydzielania wodoru.

Słowa kluczowe

EN

electrodeposition; Ni-Zn layers; nanoporous nickel foam; selective leaching; hydrogen evolution reaction; HER

PL

elektroosadzanie; warstwy Ni-Zn; nanoporowata gąbka niklowa; selektywne ługowanie; reakcja wydzielania wodoru; HER

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Ochrona przed Korozją
• Rocznik: 2021
• Tom: nr 5
• Strony: 134--139
• Opis fizyczny: Bibliogr. 32 poz., rys., wykr.

Twórcy

autor

Bakr A.

autor

El-Aziz Ahmed M.

• Materials Science Department, German University in Cairo, 11835 New Cairo, Egypt

autor

Abdel-Karim R.

• Department of Metallurgy, Faculty of Engineering, Cairo University, 12613 Giza, Egypt

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).