Nitrogen-induced interfacial electronic structure of NiS₂/CoS₂with optimized water and hydrogen binding abilities for efficient alkaline hydrogen evolution electrocatalysis

Abstract

Fabricating heterostructures with dense interfacial catalytic sites is vitally essential for implementation of high-performance hydrogen evolution reaction (HER). However, the strong correlation between the adsorbed hydrogen atoms and electronegative nonmetal...

Adjusting the energy gap and interface effect of titania nanosheets synergistically enhances the energy storage performance of PVDF-based composites

“…With the fast-growing development of electric devices and electrical power systems, polymer dielectrics with high power density and fast charge/discharge rates are particularly suited for modern electrical and electronic applications, such as high-frequency inverters, femtosecond lasers, and kinetic energy weapons. 1–4 However, the energy storage density of polymer dielectrics is generally low. For instance, the discharge energy density ( U e ) of biaxial polypropylene (BOPP) is only 2 J cm −3 at a high breakdown strength ( E b ) of ∼600 kV mm −1 , which makes it difficult to meet the demands of high energy storage equipment.…”

Increasing unsaturated Se number and facilitating atomic hydrogen adsorption of WSe2+x nanodots for improving photocatalytic H2 production of TiO2

“…It is reported that the H adsorption ability of non-metal sites in metal compounds is closely related to their p-band positions, namely the H bond strength increases as the p-band center of the non-metal is upshifted relative to the Fermi level. 56–58 As shown in Fig. 8g, the p-band of Se increases from −2.10 to −1.92 eV after Se enrichment, suggesting that the H adsorption at Se sites can be effectively strengthened to form a reinforced Se–H ads bond.…”

The effect of heteroatom doping on the active metal site of CoS2 for hydrogen evolution reaction

“…The high combustion heat value, clean combustion products, and abundant resources make hydrogen (H 2 ) a distinguished energy storage material. Producing hydrogen from the electrochemical decomposition of water (H 2 O), the commonly believed future energy carrier, 1,2 through hydrogen evolution reaction (HER) has been proved to be a clean and renewable method. However, the hydrogen production catalyst precious metal platinum (Pt), the most efficient electrocatalyst for HER owing to its high stability, low overpotential (about 0.08 V), as well low Tafel slope, 3 has not been applied on large scales due to its high cost and scarcity.…”

“…In recent decades, transition metal sulfides (TMSs), such as MoS 2 , 4–10 VS 2 , 11–15 CoS 2 , 2,16–20 NiS 2 (ref. 2, 7, 15, 21 and 22) have been attracting attention from researchers and industry practitioners.…”