Molybdenum disulfide (MoS 2 )h as been widely studied as ap otential earth-abundant electrocatalyst for the hydrogen-evolution reaction (HER). Defect engineering and heteroelemental doping are effective methods to enhance the catalytic activity in the HER, so exploring an efficient route to simultaneously achieve in-plane vacancy engineering and elemental doping of MoS 2 is necessary.I nt his study,Z inc, al ow-cost and moderately active metal, has been used to realizethis strategy by generation of sulfur vacancies and zinc doping on MoS 2 in one step.D ensity functional theory calculations reveal that the zinc atoms not only lower the formation energy of Svacancies,but also help to decrease DG H of S-vacancy sites near the Zn atoms.A ta no ptimal zincreduced MoS 2 (Zn@MoS 2 )example,the activated basal planes contribute to the HER activity with an overpotential of À194 mV at 10 mA cm À2 and al ow Tafel slope of 78 mV/dec.
A facile solvothermal method was developed to synthesize ultrathin wrinkled Pt–Pd alloy nanosheets with enhanced catalytic properties towards the formic acid oxidation reaction and oxygen reduction reaction.
Designing water-deficient solvation sheath of Zn 2 + by ligand substitution is a widely used strategy to protect Zn metal anode, yet the intrinsic tradeoff between Zn nucleation/dissolution kinetics and the side hydrogen evolution reaction (HER) remains a huge challenge. Herein, we find boric acid (BA) with moderate ligand field interaction can partially replace H 2 O molecules in the solvation sheath of Zn 2 + , forming a stable water-deficient solvation sheath. It enables fast Zn nucleation/dissolution kinetics and substantially suppressed HER. Crucially, by systematically comparing the ligand field strength and solvation energies between BA and the ever-reported electrolyte additives, we also find that the solvation energy has a strong correlation with Zn nucleation/dissolution kinetics and HER inhibition ability, displaying a classic volcano behavior. The modulation map could provide valuable insights for solvation sheath design of zinc batteries and beyond.
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