Probing the activity and stability of MoO2 surface nanorod arrays for hydrogen evolution in an anion exchange membrane multi-cell water electrolysis stack

Bartoli F, Capozzoli L, Peruzzolo T, Marelli M, Evangelisti C, Bouzek K, Hnát J, Serrano G, Poggini L, Stojanovski K, Briega-Martos V, Cherevko S, Miller HA, Vizza F (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Journal of Materials Chemistry A Royal Society of Chemistry

DOI: 10.1039/d2ta09339a

Abstract

The development of sustainable electrocatalysts is essential for promoting anion exchange membrane water electrolysis (AEMWE) technology. Ni-Mo and MoO2 materials have enhanced alkaline hydrogen evolution reaction (HER) activity. This study investigates an active HER catalyst synthesized from MoNiO4 nano-rod arrays on nickel foam using high-temperature reductive annealing. Complete characterization of the nanostructure by SEM, HR-TEM and XPS indicates that during synthesis the crystalline MoNiO4 structure of individual rods segregates a surface enriched polycrystalline MoO2 layer rather than a Ni4Mo alloy as reported previously. Mo and Ni electrochemical dissolution was studied by the scanning flow cell technique coupled with inductively coupled plasma mass spectrometry (SFC-ICP-MS). It was found that only Mo undergoes detectable dissolution phenomena, with the MoO2/Ni cathode prepared at 600 °C being the most stable. Tests in an AEMWE with a Ni foam anode demonstrate a current density of 0.55 A cm−2 (2 V) at 60 °C and H2 production was stable for more than 300 h (0.5 A cm−2). The synthesis procedure was scaled up to prepare electrodes with an area of 78.5 cm2 that were employed and evaluated in a three-cell AEM electrolyser stack.

Involved external institutions

University of Chemistry and Technology (UCT) / Vysoká škola chemicko-technologická (VŠCHT) CZ Czech Republic (CZ) Università degli Studi di Firenze / University of Florence IT Italy (IT) Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy IT Italy (IT) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Bartoli, F., Capozzoli, L., Peruzzolo, T., Marelli, M., Evangelisti, C., Bouzek, K.,... Vizza, F. (2023). Probing the activity and stability of MoO2 surface nanorod arrays for hydrogen evolution in an anion exchange membrane multi-cell water electrolysis stack. Journal of Materials Chemistry A. https://dx.doi.org/10.1039/d2ta09339a

MLA:

Bartoli, Francesco, et al. "Probing the activity and stability of MoO2 surface nanorod arrays for hydrogen evolution in an anion exchange membrane multi-cell water electrolysis stack." Journal of Materials Chemistry A (2023).

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