No abstract

Exploration of earth-abundant transition-metal sulfide electrocatalysts with Pt-like activity toward alkaline hydrogen evolution reaction (HER) is significant for future global energy supply but still a challenge. Herein, we rationally designed and fabricated a self-supported F-anion-doped Ni3S2 nanosheet array grown on Ni foam (F–Ni3S2/NF) with enhanced HER performance in alkaline media. The obtained catalyst exhibits a low overpotential of 38 mV at 10 mA cm–2 with a Tafel slope of 78 mV dec–1 and can sustain for 30 h, which is comparable to commercial Pt/C catalysts. X-ray photoelectron spectroscopy, synchrotron-based X-ray absorption fine structure, and density functional theory analysis simultaneously demonstrate the successful modulation of the electronic structure of Ni3S2 by substitutional F doping. This work not only provides atomic-level insight into adjusting the electronic structure of metal sulfides through anion engineering but also opens an avenue for reasonable design of advanced earth-abundant electrocatalysts toward HER and beyond.

Developing cost‐effective and high‐efficiency electrocatalysts toward alkaline oxygen evolution reaction (OER) is crucial for water splitting. Amorphous bimetallic NiFe‐based (oxy)hydroxides have excellent OER activity under alkaline media, but their poorly electrical conductivity impedes the further improvement of their catalytic performance. Herein, a bimetallic NiFe‐based heterostructure electrocatalyst that is composed of amorphous NiFe(OH)x and crystalline pyrite (Ni, Fe)Se2 nanosheet arrays is designed and constructed. The catalyst exhibits an outstanding OER performance, only requiring low overpotentials of 180, 220, and 230 mV at the current density of 10, 100, and 300 mA cm−2 and a low Tafel slope of 42 mV dec−1 in 1 m KOH, which is among the state‐of‐the‐art OER catalysts. Based on the experimental and theoretical results, the electronic coupling at the interface that leads to the increased electrical conductivity and the optimized adsorption free energies of the oxygen‐contained intermediates plays a crucial role in enhancing the OER activities. This work focusing on improving the OER performance via engineering amorphous‐crystalline bimetallic heterostructure may provide some inspiration for reasonably designing advanced electrocatalysts.

Iron−nickel sulfide ((Ni,Fe) 3 S 2 ) is one of the most promising bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media because of their metallic conductivity and low cost. However, the reported HER activity of (Ni,Fe) 3 S 2 is still unsatisfactory. Herein, three-dimensional self-supported phosphorus-doped (Ni,Fe) 3 S 2 nanosheet arrays on Ni foam (P-(Ni,Fe) 3 S 2 /NF) are synthesized by a simple one-step simultaneous phosphorization and sulfuration route, which exhibits dramatically enhanced HER activity as well as drives remarkable OER activity. The incorporation of P significantly optimized the hydrogen/water absorption free energy (ΔG H* /ΔG H 2 O* ), enhanced electrical conductivity, and increased electrochemical surface area. Accordingly, the optimal P-(Ni,Fe) 3 S 2 /NF exhibits relatively low overpotentials of 98 and 196 mV at 10 mA cm −2 for HER and OER in 1 M KOH, respectively. Furthermore, an alkaline electrolyzer comprising the P-(Ni,Fe) 3 S 2 /NF electrodes needs a very low cell voltage of 1.54 V at 10 mA cm −2 and exhibits long-term stability and outperforms most other state-of-the-art electrocatalysts. The reported electrocatalyst activation approach by anion doping can be adapted for other transition-metal chalcogenides for water electrolysis, offering great promise for future applications.

Polycrystalline ZnSnN(2) thin films were successfully prepared by DC magnetron sputtering at room temperature. Both the as-deposited and annealed films showed n-type conduction, with electron concentration varying between 1.6×10(18) and 2.3×10(17)  cm(-3) and the maximum mobility of 3.98  cm(2)  V(-1) s(-1). The basic optical parameters such as the refraction index, extinction coefficient, and absorption coefficient were precisely determined through the spectroscopic ellipsometry measurement and analysis. The optical bandgap of the ZnSnN(2)films was calculated to around 1.9 eV, with the absorption coefficient greater than 10(4)  cm(-1) at wavelengths less than 845 nm. The easy-fabricated ZnSnN(2) possesses a sound absorption coefficient ranging from the ultraviolet through visible light and into the near-infrared, comparable to some typical photovoltaic materials such as GaAs, CdTe, and InP.