The Influence of the Electrodeposition Parameters on the Properties of Mn-Co-Based Nanofilms As Anode Materials for Alkaline Electrolysers

Overview

Journal Materials (Basel)

Publisher MDPI

Date 2020 Jun 18

PMID 32545248

Citations 3

Authors

Karolina Cysewska

Maria Krystyna Rybarczyk

Grzegorz Cempura

Jakub Karczewski

Marcin Lapinski

Piotr Jasinski

Sebastian Molin

Affiliations

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Abstract

In this work, the influence of the synthesis conditions on the structure, morphology, and electrocatalytic performance for the oxygen evolution reaction (OER) of Mn-Co-based films is studied. For this purpose, Mn-Co nanofilm is electrochemically synthesised in a one-step process on nickel foam in the presence of metal nitrates without any additives. The possible mechanism of the synthesis is proposed. The morphology and structure of the catalysts are studied by various techniques including scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The analyses show that the as-deposited catalysts consist mainly of oxides/hydroxides and/or (oxy)hydroxides based on Mn, Co, and Co. The alkaline post-treatment of the film results in the formation of Mn-Co (oxy)hydroxides and crystalline Co(OH) with a β-phase hexagonal platelet-like shape structure, indicating a layered double hydroxide structure, desirable for the OER. Electrochemical studies show that the catalytic performance of Mn-Co was dependent on the concentration of Mn versus Co in the synthesis solution and on the deposition charge. The optimised Mn-Co/Ni foam is characterised by a specific surface area of 10.5 m·g, a pore volume of 0.0042 cm·g, and high electrochemical stability with an overpotential deviation around 330-340 mV at 10 mA·cm for 70 h.

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