Ni/NiO heterostructures encapsulated in oxygen-doped graphene as multifunctional electrocatalysts for the HER, UOR and HMF oxidation reaction

Abstract

A controlled scalable arc-discharge method was developed to produce metal/metal oxide nanoparticles encapsulated in graphene as excellent catalysts for multiple reactions, including HER, UOR, and the HMF oxidation reaction.

Current Advances in the Sustainable Conversion of 5‐Hydroxymethylfurfural into 2,5‐Furandicarboxylic Acid

“…Also, NiSe was converted into a core–shell structure, covered by a nickel oxide/hydroxide shell, proving to have good catalytic activity and superior stability for water splitting and methanol oxidation [93] . Wang et al [94] . recently reported Ni/NiO nanoparticles encapsulated in oxygen‐doped graphene as multifunctional electrocatalysts for hydrogen evolution, urea oxidation, and HMF‐EOR.…”

“…Also, NiSe was converted into a core-shell structure, covered by a nickel oxide/hydroxide shell, proving to have good catalytic activity and superior stability for water splitting and methanol oxidation. [93] Wang et al [94] recently reported Ni/NiO nanoparticles encapsulated in oxygen-doped graphene as multifunctional electrocatalysts for hydrogen evolution, urea oxidation, and HMF-EOR. The oxygengraphene shell plays a fundamental role in increasing the stability and activity of Ni/NiO since protects the Ni-based catalyst from the alkaline electrolyte and provides active sites for the reaction.…”

Electro‐ and Photocatalytic Oxidative Upgrading of Bio‐based 5‐Hydroxymethylfurfural

“…[74] The yield of FDCA was close to 100 %, and the faradaic efficiency of HMF conversion was 99.4 %. A variety of Ni-based electrocatalysts with excellent properties have been prepared, such as trimetallic NiCoFe-LDHs, [75] ultrathin Ni(OH) 2 nanosheets modified with amorphous Cu(OH) 2 islands, [76] sulfurmodulated nickel/carbon composites (SÀ Ni@C), [77] P-doped NiB x (NiB x À Py), [78] Ni/NiO heterostructures encapsulated with oxygendoped grapheme, [79] and V 2 O 3 -doped Ni 3 N. [80] In addition, some Ni-based catalysts are bifunctional electrocatalysts, which catalyze the oxidation of HMF as an anode material, and efficiently promote HER as a cathode material. A three-dimensional NiP nanoparticle array on nickel foam (Ni 2 P NPA/NF) can efficiently electrocatalyze the HMF-to-FDCA oxidation and the preparation of H 2 .…”

Recent Progress in Graphene-Based Electrocatalysts for Hydrogen Evolution Reaction

“…In addition, Iwona et al [ 88 ] deposited Ni on reduced graphene oxide, which has a cauliflower-like structure with a well-developed surface morphology, thereby enhancing the catalytic activity of Ni for HER by water. A new catalyst of Ni/NiO nanoparticles encapsulated in graphene layers was prepared by Wang et al [ 89 ] using an arc discharge method at 30 V and 100 A. The catalyst showed superior HER activity based on synergy and achieved a low overpotential of 112 mV at a current density of 20 mA/cm 2 in 1 M KOH solution, and the HER activity equivalent to that of the rare metal Pt.…”