Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 280, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mseb.2022.115711
Keywords
NiO thin film; Pulsed laser deposition; Lattice strain; Hydrogen evolution reaction; Cyclic voltammetry
Funding
- NSF PREM grant [DMR-2122067]
- NSF Major Research Instrumentation (MRI) program [CMMI1040290]
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This study investigates the influence of substrate-induced strain on the electrocatalytic properties of NiO films for the hydrogen evolution reaction. It was found that NiO thin films exhibit strong sensitivity to strain, with the film showing the smallest strain recording the lowest overpotential for the HER. The use of simple thin-film synthesis to evaluate strain effects in electrocatalysis is demonstrated.
The storage of renewable energy is an important step toward the global effort to combat air contamination and climate change. In this work, the influence of substrate-induced strain on the electrocatalytic properties of nickel oxide (NiO) films toward the hydrogen evolution reaction (HER) is studied. Using pulsed laser deposition, NiO thin films were deposited on strontium titanate, lanthanum aluminate, and sapphire substrates to examine how the substrate-film lattice mismatch influences the electrochemical properties. It was observed that the electrocatalytic activities of the NiO thin films exhibited strong sensitivity to strain; the NiO film with the smallest strain recorded the lowest overpotential for the HER. The NiO films were further explored to estimate the charge storage capacity and surface roughness. This work shows the use of simple thin-film synthesis as a way to evaluate the strain effect in electmcatalysis.
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