Vertically Oriented Metallic Heterodimer Array Semiembedded in Flat Conductive Carbon Film for Electrochemical Application.
Shunsuke ShibaAyaka KoikeShota TakahashiDai KatoTomoyuki KamataOsamu NiwaPublished in: ACS nano (2022)
General synthesis of a highly oriented metallic heterodimer array based on a selective electrodeposition technique onto a metal nanoparticle-embedded carbon film is proposed, which enables the preparation of heterodimers with a wide variety of metal combinations. This method requires no surfactant, capping agent, organic solvent, or heat treatment. As a representative metal combination, a nickel (Ni)/palladium (Pd) heterodimer array was prepared by selective electrodeposition of Ni nanoparticles (Ni NPs) on top of partially exposed Pd NPs embedded in carbon film electrodes fabricated by a cosputtering technique. Such a selective electrodeposition becomes possible by utilizing the difference in electrodeposition overpotentials between carbon and Pd NP surfaces. X-ray photoelectron spectroscopy revealed a charge transfer from Ni NPs to Pd NPs, implying that the catalytic and optical properties can be expected to be controllable. The formed heterodimer array structure was mechanically stable against ultrasonication in ethanol for over 1 h because most parts of the Pd NPs were tightly embedded in the carbon film. After conversion from Ni to nickel hydroxide (Ni(OH) 2 ), the electrode showed high electrocatalytic activity toward glucose oxidation, with a higher turnover rate and lower overpotential compared to Ni(OH) 2 electrodeposited on pure carbon film electrodes.
Keyphrases
- reduced graphene oxide
- gold nanoparticles
- metal organic framework
- high resolution
- transition metal
- high throughput
- oxide nanoparticles
- room temperature
- carbon nanotubes
- ionic liquid
- staphylococcus aureus
- type diabetes
- high density
- computed tomography
- adipose tissue
- solid state
- combination therapy
- magnetic resonance imaging
- escherichia coli
- blood pressure
- mass spectrometry
- nitric oxide
- cystic fibrosis
- molecularly imprinted
- blood glucose
- single molecule
- candida albicans