Manipulating the Electrocatalytic Performance of NiCoP Nanowires by V Doping Under Acidic and Basic Conditions for Hydrogen and Oxygen Evolution Reactions

Abstract

It is critical to design bifunctional nonprecious electrocatalysts with low costs and high efficiency for hydrogen production. Conventional electrocatalysts, on the other hand, frequently exhibit significant overpotential and slow transfer kinetics in both hydrogen and oxygen evolution reactions (HER and OER). Cation doping engineering is believed to be a suitable way to deal with this problem. To accomplish effective water electrolysis, we use a simple vanadium ion doping strategy to prepare 0.5V-NiCoP. In acidic and alkaline environments, the as-synthesized samples show an overpotential of 78.7 and 56.1 mV for the HER at 10 mA cm −2 , respectively. In 1 M KOH, it shows an overpotential of 254 mV for the OER at 50 mA cm −2 . Furthermore, under a twoelectrode alkaline state, the as-obtained products only require 1.67 V (50 mA cm −2 ) to drive water splitting.

Hierarchical Co3O4@Ni3S2 electrode materials for energy storage and conversion

“…Double-layer capacitances (C dl ) are calculated by CV curves. 54 In Fig. 6d, C dl of the Co 3 O 4 @Ni 3 S 2 -3 (74.1 mF cm −2 ) electrode material is higher than Co 3 O 4 (13.6 mF cm −2 ), Co 3 O 4 @Ni 3 S 2 -1 (64.4 mF cm −2 ), and Co 3 O 4 @Ni 3 S 2 -5 (69.2 mF cm −2 ) materials.…”

DNA Origami-Templated Bimetallic Core–Shell Nanostructures for Enhanced Oxygen Evolution Reaction

“…However, large-scale hydrogen synthesis from electrochemical water splitting remains a concern due to the kinetically sluggish anodic oxygen evolution reaction (OER). − Cathodic hydrogen evolution reaction (HER) is a two-electron-transfer reaction while OER is a complicated four-electron–proton coupled reaction, and so higher overpotential is needed for OER than HER to overcome the kinetic energy barrier. Conventional electrocatalysts based on noble-metal oxides such as IrO 2 and RuO 2 are considered benchmark catalysts for OER exhibiting high activity in both acidic and alkaline electrolytes, but these materials are less abundant and suffer from poor sustainability. − Other transition metal-based nanostructures have also been reported for extensive use in electrocatalysis for OER due to their low cost and good stability. − …”

Co-doped MoS2nanosheet: a stable and pH-universal electrocatalyst for an efficient hydrogen evolution reaction

“…16,17 Hetero-atom doping can significantly enhance the intrinsic activity of active sites or induce the formation of new active sites. 18,19 For instance, Li's group prepared a zinc-doped Zn-1T/2H-MoS 2 sample by a hydrothermal route, which presents an overpotential of 190 mV in acidic solution. 20 A Ru-MoS 2 /CC electrocatalyst can work in a broad pH range.…”