Catalytic activity and impedance behavior of screen-printed nickel oxide as efficient water oxidation catalysts

Singh, Archana, Fekete, Monika, Genenbach, Thomas, Simonov, Alexandr N., Hocking, Rosalie K., Chang, Shery L.Y., Rothmann, Mathias, Powar, Satvasheel, Fu, Dongchuan, Hu, Zheng, Wu, Qiang, Cheng, Yi-Beng, Bach, Udo, and Spiccia, Leone (2015) Catalytic activity and impedance behavior of screen-printed nickel oxide as efficient water oxidation catalysts. ChemSusChem, 8 (24). pp. 4266-4274.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website:


We report that films screen printed from nickel oxide (NiO) nanoparticles and microballs are efficient electrocatalysts for water oxidation under near-neutral and alkaline conditions. Investigations of the composition and structure of the screen-printed films by X-ray diffraction, X-ray absorption spectroscopy, and scanning electron microscopy confirmed that the material was present as the cubic NiO phase. Comparison of the catalytic activity of the microball films to that of films fabricated by using NiO nanoparticles, under similar experimental conditions, revealed that the microball films outperform nanoparticle films of similar thickness owing to a more porous structure and higher surface area. A thinner, less-resistive NiO nanoparticle film, however, was found to have higher activity per Ni atom. Anodization in borate buffer significantly improved the activity of all three films. X-ray photoelectron spectroscopy showed that during anodization, a mixed nickel oxyhydroxide phase formed on the surface of all films, which could account for the improved activity. Impedance spectroscopy revealed that surface traps contribute significantly to the resistance of the NiO films. On anodization, the trap state resistance of all films was reduced, which led to significant improvements in activity. In 1.00 M NaOH, both the microball and nanoparticle films exhibit high long-term stability and produce a stable current density of approximately 30 mA cm−2 at 600 mV overpotential.

Item ID: 41581
Item Type: Article (Research - C1)
ISSN: 1864-5631
Keywords: catalysis; water splitting
Funders: Australian Research Council (ARC), Department of Science and Technology of India (DST)
Projects and Grants: ARC Centre of Excellence for Electromaterials Science, DST Inspire Grant
Date Deposited: 10 Dec 2015 02:51
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030201 Bioinorganic Chemistry @ 50%
03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 50%
SEO Codes: 85 ENERGY > 8504 Energy Transformation > 850402 Hydrogen-based Energy Systems (incl. Internal Hydrogen Combustion Engines) @ 50%
97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page