The slow kinetics of oxygen evolution reaction (OER) has seriously hindered the development of electrical water splitting and rechargeable metal-air batteries. The ethanol oxidation reaction (EOR) to replace OER is...

Hydrogen production from overall water splitting assisted by organic oxidation reforming reaction is an innovative method to improve the anode behavior. Utilizing transition metal chalcogenides where the electronic states are regulated by anion modification, hexagonal Se‐NiSx pine‐needle‐like nanowires are prepared via a simple one‐pot hydrothermal reaction without any post‐processing steps. The nanowires can serve as ethanol electrooxidation reaction (EOR) catalyst with outstanding electrocatalytic activity (j100 = 1.36 V) and long‐term durability. In the practical tests of the hybrid water splitting, the catalyst required only 1.50 V to obtain 50 mA cm−2, and worked stably for over 50 h at a high current density of 200 mA cm−2 accompanied by an excellent selectivity (FE = 98.0%). These demonstrate that the introduction of Se significantly improves the catalytic performance of transition‐metal chalcogenides for EOR, indicating a new avenue for the design and improvement of other electrocatalysts.

Aqueous zinc-ion batteries are a promising option for rechargeable energy storage devices. However, their performance is limited by the growth of zinc dendrites that can cause short circuits. Our research shows that adding a certain percentage of hydrogen peroxide solution to the electrolyte can effectively inhibit the irregular and non-planar growth of zinc dendrite crystals. This additive alters the deposition pattern of zinc and reduces surface roughness. Our experimental results indicate that the electrolyte with H2O2 can increase the cycle life by about 13 times compared to the electrolyte without the additive, extending it to 1057 h. The mechanism analysis reveals that H2O2 replaces H2O in forming hydrated zinc ions and facilitates zinc deposition during charging. Additionally, H2O2 significantly lowers the over-potential for zinc dendrite nucleation and suppresses the tip effect, leading to a uniform zinc morphology. This simple and eco-friendly electrolyte additive provides a strategy to regulate the deposition behavior of zinc.