V‐Doping Strategy Induces the Construction of the Functionally Complementary Ru₂P/V‐RuP₄ Heterostructures to Achieve Amperometric Current Density for HER

Abstract

It is a great challenge to induce the formation of the RuP4 phase and realize the construction of a metal‐rich phase/phosphorus‐rich phase‐ruthenium phosphide heterostructure by directional regulation of the proportion of P and metal atoms. The ultra‐high conductivity of Ru2P and the excellent ability of V‐doped RuP4 to absorb/desorb H* are confirmed by density functional theory (DFT) calculations, which laid a theoretical foundation for the construction of a unique Ru2P/V‐RuP4 structure to accelerate HER reaction kinetics. This work innovatively uses the V‐doping strategy to induce the formation of RuP4 phase with high intrinsic activity, and finally construct V‐RuxPy nanosheets with rich Ru/Ru2P/V‐RuP4 heterostructures. Thanks to the rich Ru/Ru2P/V‐RuP4 heterostructure and the optimization of V dopants, the V‐RuxPy catalyst only needs 180 mV to obtain an industrial‐grade current density of 1 A cm−2. In summary, this work provides a new idea for the design and performance optimization of ruthenium‐based catalysts.

Optimized Fabrication of Supercapacitor Using MOF-Derived NiCo2O4 with Porous Carbon as Cathode: Electrochemical Characterization and Stability Analysis using Time Series Analysis Technique

“…Alternatively, aqueous electrolytes offer nonflammability, cost-effectiveness, and higher ion conductivity and contribute to increased capacitance due to smaller ions for nonsluggish electrode–electrolyte kinetics. ,, These favorable cost and environmentally friendly aspects of aqueous electrolytes position them as promising candidates for solid-state supercapacitor fabrication. However, the aggressive nature of aqueous electrolytes, their confined potential window (less than 2.0 V), and nonintercalation-based energy storage mechanism result in unsatisfactory energy density. , This limitation subjects the use of aqueous electrolytes to optimization with suitable anode and cathode materials to achieve high-performance, cost-effective, and environmentally friendly solid-state SCs. − Hence, these drawbacks can be overcome by fabricating asymmetric SCs with cathodes and anodes possessing diverse potential windows. , Since the energy density is directly proportional to the operating window, extension of the operating window of the supercapacitor can uplift the energy density of the supercapacitor device. , …”