Design, Synthesis and High HER Performances of 3D Ni/Mo Sulfide on Ni Foam

Abstract

Exploring noble‐metal‐free and earth‐abundant electrocatalysts for the hydrogen evolution reaction (HER) is an efficient way to mitigate energy and protect the environment. Herein, a noble‐metal‐free core‐shell catalyst, MoS2/Ni3S2/NF, was designed for HER and synthesized using a simple one‐step hydrothermal method. The MoS2−Ni3S2 hetero‐structured nanorods show a high HER performance with an overpotential of 93 mV at a current density of 10 mA/cm2 in alkaline conditions. The study combines density function theory (DFT) calculation with electrochemical experiments proved that the strong coupling synergy between MoS2 and Ni3S2 optimizes the electronic structure of the product and reduces the adsorption energy of water molecules, thus significantly enhancing the electrochemical HER activity. This work reveals the reaction mechanism of electrochemical hydrolysis and might shed some new lights on the design and fabrication of efficient and robust three‐dimensional hybrid electrode materials for a variety of electrochemical applications

Hierarchical Cu(OH)2@Co(OH)2 Nanotrees for Water Oxidation Electrolysis

“…[1,3] Hydrogen generation from water elec-trolysis appears as one of the most promising substitute to fossil fuels and considerable efforts are currently devoted to the development of water electrolysis. [4][5][6] However, the performance of water electrolyzers largely depends on the electrocatalysts to be used, and in particular its chemical composition and nano-morphology. The most viable and efficient electrocatalysts for water oxidation are noble metal materials, such as RuO 2 and IrO 2 .…”

NCoCu Carbon Dots Intertwined NiCo Double Hydroxide Nanorod Array for Efficient Electrocatalytic Hydrogen Evolution

“…The peak at 855.3 eV belongs to Ni 2 + in Ni(OH) 2 , and the peak at 856.2 belongs to Ni 3 + in the surface NiOOH. [46][47][48][49] The proportion of Co 3 + /(Co 3 + + Co 2 + ) in CDs catalyst (76.6 %) is significantly greater than that of the conventional NFÀ CoNi catalyst (70.8 %). The ratio of Ni 3 + /(Ni 3 + + Ni 2 + ) in CDs catalyst (56.8 %) is also greater than that of the conventional NFÀ NiCo catalyst (46.1 %) (Figure 5g).…”

Engineering Hierarchical‐Dimensional Co(OH)F into CoP Superstructure for Electrocatalytic Water Splitting

“…In specific, strategies have been developed to address the mass diffusion problem, including making porous materials and assembling low dimensional materials into superstructures. For the latter, arrays of low dimensional nanowires and nanorods have been prepared with enhanced performance . However, the assembly of low dimensional structures into superstructures usually requires complicated method.…”

“…For the latter, arrays of low dimensional nanowires and nanorods have been prepared with enhanced performance. [4] However, the assembly of low dimensional structures into superstructures usually requires complicated method. To address this issue, we recently proposed the concept of hierarchical-dimensional material (HDM), in which superstructure is composed of low dimensional substructures from simple wet chemical method.…”