N and V Coincorporated Ni Nanosheets for Enhanced Hydrogen Evolution Reaction

Abstract

Searching for earth-abundant and efficient electrocatalysts for large-scale hydrogen generation from the electrolysis of water is of paramount importance. Incorporating nonmetal or metal elements into host catalysts is a possible way to tune the catalytic capability of an electrocatalyst on the hydrogen evolution reaction (HER). Here, a simple and facile way was presented to synthesize N and V coincorporated Ni nanosheets on self-supported conductive carbon paper (NV–Ni/CP) as noble-metal-free catalysts for the HER. Compared with Ni/CP, the NV–Ni/CP shows better HER property with low overpotential of 95 mV (10 mA cm–2), small Tafel slope (140 mV dec–1), and superior long-term stability. We further show that the outstanding HER performance of NV–Ni/CP is ascribed to the increased active sites and enhanced conductivity. It is expected that the coincorporation of nonmetal and metal elements will provide more chances to enhance the HER catalytic ability and extend the scope of cost-effective electrocatalysts.

Anion–Cation Double Doped Co3O4 Microtube Architecture to Promote High-Valence Co Species Formation for Enhanced Oxygen Evolution Reaction

“…The electrochemical surface area (ECSA) of the obtained samples can be reflected by the electrochemical double layer capacitance ( C dl ), , which is measured by cyclic voltammograms at different scan rates (Figure S14). The larger ECSA indicates more exposed active sites.…”

“…Oxygen evolution reaction (OER) has attracted tremendous attention due to its critical role in some important electrochemical energy conversion and storage systems such as sustainable water splitting for hydrogen production and rechargeable metal–air batteries. − The OER involves a complicated four-electron process through the following equations: − …”

FeV3O8/MoS2 nanostructure heterojunctions as a highly effective electrocatalyst for hydrogen evolution

“…The electrochemical properties of the obtained catalysts were measured using CHI 760 electrochemical techniques (CHI instruments, Shanghai, China) based on a typical threeelectrode system composed of an Ag/AgCl electrode, a carbon rod and a glassy carbon electrode (GCE, 3.0 mm in diameter) coated with a certain amount of catalyst as the reference electrode, counter electrode and working electrode in 0.5 M H 2 SO 4 solution at 25 1C, respectively. For the reversible hydrogen electrode (RHE), the reference electrode was calibrated 35,36 without iR compensation (as shown in eqn (1)). Then, for preparation of the working electrode: (1) 5.0 mg of the assynthesized catalyst was dispersed into 1.0 mL of mixed solution (deionized water and ethanol at a volume ratio of 1 : 1) and stirred for 0.5 h to form a homogenous catalyst ink;…”

A Trimetallic Cobalt/Iron/Nickel Phytate Catalyst for Overall Water Splitting: Fabrication by Magnetic‐Field‐Assisted Bipolar Electrodeposition

“…Additionally, compared with mono-metal complexes, polymetallic complexes have been proved to show richer faraday redox, higher conductivity and stability due to the optimization of their electronic structure. [7] Nickel is a promising catalyst material, such as Ni-transition metal alloy electrodes with Co, [8] V, [9] Fe, [10] Mo [11] and Cu. [12] This is a way to enhance the electroactivity of Ni electrodes to the HER and OER.…”