Enhanced Hydrogen Evolution Catalysis Based on Cu Nanoparticles Deposited on Carbon Nanotubes at the Liquid/Liquid Interface

Abstract

Copper nanoparticles were electrodeposited in situ on a conductive multi‐walled carbon nanotubes (MWCNT) support at a free‐standing water/1,2‐dichloroethane interface. The Cu/MWCNT nanocomposites act as highly active hydrogen evolution catalysts at the interface in the presence of lipophilic decamethylferrocene as the reducing agent.

Enhanced Hydrogen Evolution Catalysis at the Liquid/Liquid Interface by NixSy and NixSy/Carbon Nanotube Catalysts

“…According to these results, the rates of the reaction were about 690 and 2000 times higher in the presence of the Ni x S y and Ni x S y /CNT catalysts, respectively, than if the reaction was performed in the absence of a catalyst. The reaction rate was also increased by a factor of 6 by using only the CNTs, and this increased rate might have originated from trace amounts of metal impurities in the commercially available CNTs , , …”

“…Recently, it was shown that four‐electrode voltammetry performed at the interface of water and the organic phase was an effective method to study catalytic reactions . Thus, the catalytic activities of Ni x S y and the Ni x S y /CNT composite for the HER by DMFc were investigated by potentiostatic polarization of the water/DCE interface (Scheme b).…”

“…The HER at a polarized water/1,2‐dichloroethane (DCE) interface was investigated by using noble‐metal (Pt, Pd) and non‐noble‐metal (Cu) nanoparticles and inorganic nonprecious catalysts (MoS 2 , Mo 2 C, MoB, WS 2 , CoS, Cu 2 WS 4 ) . In addition, the rate of the HER was shown to increase dramatically by using Cu, Mo 2 C, and CoS catalysts supported on carbon nanotubes (CNTs), , and MoS 2 decorated on graphene oxide or mesoporous carbon owing to the advantages of the supporting materials , . However, the catalytic HER rate of Ni x S y (NiS and Ni 17 S 18 ) and Ni x S y /CNT has not yet been investigated at the liquid/liquid interface.…”

Mediated water electrolysis in biphasic systems

“…3(C), blue trace . Glassy carbon and platinum disc electrodes were used as the working and counter electrodes respectively, while the reference electrode was a Ag + /Ag DJ-ORE. Pt or Pd salts at the interface in the presence of an oil-based electron donor) 15,29 or, more simply, by floating pre-formed H 2 evolution catalytic nanoparticles 20,[30][31][32][33][34][35][36][37][38][39] or nanocomposites [40][41][42] at the water-organic interface (Scheme 5(C)). These floating catalysts can significantly improve efficiency in terms of turnover frequency of [Cp 2 *Fe (III) ] + consumption/regeneration cycles.…”

Intrinsic Catalytic Activity of Gold/Multi-Walled Carbon Nanotubes Composites in Squaric Acid-Iron(II/III) System

“…As the catalyst support, extensive efforts have been made in the past several decades. There are many applications of CNTs which are often hybridized by organic polymer [9], graphene oxide [10], metallic oxide [11,12], metal (Ni, Pt, Au) [13,14], along with other materials. These nanocomposites express special advantages in the high surface area to volume ratios, which provide a unique opportunity for catalyst supports, enhancing the catalyst longevity and sensitivity [15].…”