In situ synthesis of noble metal nanoparticles on onion-like carbon with enhanced electrochemical and supercapacitor performance

Abstract

Ultrafine noble metal nanoparticles decorated on onion-like carbon (OLC) were successfully prepared without any reductant or surfactant. Particularly, the as-prepared Pt-OLC nanocomposite not only exhibited superior electrocatalytic activity and stability for the hydrogen evolution reaction as compared with the commercial 20% Pt/C, but also showed enhanced supercapacitor performance with a specific capacitance almost four times larger than that of OLC. Notably, the C-O functional groups on the surface of OLC will increase after the reaction because of the oxidation by O 2 and chloroplatinic acid, which is very useful for the reuse of OLC and helpful for the decoration of noble metal nanoparticles on OLC. This work provides a simple and straightforward method for the facile preparation of metal composite nanocatalysts with high catalytic activity.

Electrochemical synthesis of carbon nano onions

“…CNOs can be used as electrode materials and supercapacitors because of their good electrical conductivity and large specific surface area. [6][7][8] With good biocompatibility, CNOs can be widely applied in the field of biosensing and detection. [9][10][11] CNOs exhibit catalytic properties in oxidative dehydrogenation reactions and oxygen reduction reactions.…”

A Review of Fabrication Technologies for Carbon Electrode-Based Micro-Supercapacitors

“…Micro-supercapacitors were produced with nanostructured carbon onions of 6-7 nm diameter, forming a layer of several micrometres using an electrophoretic deposition method [40]. Onion-like carbon was decorated with platinum nanoparticles to increase the specific capacitance by four times in comparison to undecorated onion-like carbon [95]. In another study, highly graphitized carbon onion was physically grafted with 1-nitropyrene to achieve an increase in the capacity of the electrode by almost two times to 38 mAh/g, and the initial capacity remained very high even after 4000 cycles [96].…”

Tunable Plasmon-Induced Charge Transport and Photon Absorption of Bimetallic Au–Ag Nanoparticles on ZnO Photoanode for Photoelectrochemical Enhancement under Visible Light

“…Noble metal nanoparticles (NPs) have been extensively employed in the field of dye sensing, − photovoltaic, − energy storage, , and catalysis − applications owning to their tunable optical, electrical sensing, and catalytic properties. Upon photon excitation, these NPs exhibit collective oscillation of electron clouds on the surface known as localized surface plasmon resonance (LSPR), which is highly dependent on the metal type, − size, , and shape. , Metal NPs derived from solid-state thermal dewetting (SSTD) of ultrathin metal film offers facile large-area fabrication capability and its techniques to provide controllable size and spacing − in a reproducible and flexible manner is of paramount importance in plasmonic applications.…”

“…Noble metal nanoparticles (NPs) have been extensively employed in the field of dye sensing, 1−3 photovoltaic, 4−6 energy storage, 7,8 and catalysis 9−13 applications owning to their tunable optical, electrical sensing, and catalytic properties. Upon photon excitation, these NPs exhibit collective oscillation of electron clouds on the surface known as localized surface plasmon resonance (LSPR), which is highly dependent on the metal type, 14−16 size, 17,18 and shape.…”