Mesoporous Ni–Pt nanoparticles on Ni foam by electrodeposition: Dual porosity for efficient alkaline hydrogen evolution
Year: 2024
Type: article
Abstract: In order to maximise electrochemically active surface area for water splitting, mesoporous Ni–Pt nanoparticles (NPs) are electrodeposited onto open-cell Ni foam to obtain a dual (macro- and meso-) porosity. Homogeneous deposition of the NPs is achieved by the use of a cylindrical Pt-coated mesh counter electrode, establishing a uniform electric field around the Ni foam substrate during electrodeposition. The Ni/Pt ratio is tunable with the electrodeposition parameters and all NPs are single-phase face-centred cubic solid solution and nanocrystalline, with a pore size of approx. 10 nm. Ni foam decorated with the Ni-rich particles, with mean particle sizes ranging from 50 to 80 nm, shows significantly higher activity at hydrogen evolution reaction (HER) in alkaline media with respect to the bare Ni foam. The highest HER efficiency was found for a relatively low Pt content of the NPs of about 26 at% (i. e., at 74 at% Ni) with an improvement of a factor 8 over bare Ni foam after durability assessment. These improvements are attributed to the higher surface area thanks to the NP structure, the dual porosity, and the alloying with Pt. • Successful synthesis of mesoporous Ni–Pt nanoparticles on porous Ni foam substrate. • Dual porosity of nanoparticles and foam leads to outstanding hydrogen evolution. • Uniform distribution of mesoporous nanoparticles with tailorable composition. • Highest activity and durability for nanoparticles with low Pt content of 26 at%.
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,400
Funders: European Commission, Generalitat de Catalunya, Federación Española de Enfermedades Raras, Eusko Jaurlaritza, Ministerio de Asuntos Económicos y Transformación Digital, Gobierno de España, Horizon 2020 Framework Programme, Horizon 2020, European Regional Development Fund, H2020 Marie Skłodowska-Curie Actions, St. Mary's County Department of Economic Development, Ministerio de Universidades
Awards: G2478530389, G2642906521, Advanced integrative solutions to Corrosion problems beyond micro–scale: towards long-term durability of miniaturized Biomedical, Electronic and Energy systems, G4028457781, G434337789, Ni-BASED FERROMAGNETIC COATINGS WITH ENHANCED EFFICIENCY TO REPLACE Pt IN ENERGY & DIGITAL STORAGE APPLICATIONS, G585145024, Advanced integrative solutions to Corrosion problems beyond micro–scale: towards long-term durability of miniaturized Biomedical, Electronic and Energy systems
OpenAlex ID: W4405544009