Bimetallic‐Based Electrocatalysts for Oxygen Evolution Reaction

Advanced Functional Materials, Год журнала: 2022, Номер 33(10)

Опубликована: Дек. 26, 2022

Abstract The electrochemical oxygen evolution reaction (OER) is a core electrode for the renewable production of high‐purity hydrogen, carbon‐based fuel, synthetic ammonia, etc. However, sluggish kinetics OER result in high overpotential and limit widespread application OER‐based technologies. Recent studies have shown that bimetallic‐based materials with synergism different metal components to regulate adsorption dissociation energy intermediates are promising electrocatalyst candidates lower cost consumption. In past two decades, tremendous efforts been devoted developing applications focus on compositions, phase, structure, etc., highlight components. there lack critical thinking organized analysis materials. This review critically discusses challenges materials, summarizes current optimization strategies enhance both activity stability, highlights state‐of‐the‐art electrocatalysts OER. relationship between componential/structural features their electrocatalytic properties presented form comprehensive electronic geometric modifications based thorough reported works discuss future realize sustainable applications.

Язык: Английский

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Solid-State Reaction Synthesis of Nanoscale Materials: Strategies and Applications

Chemical Reviews, Год журнала: 2022, Номер 122(15), С. 12748 - 12863

Опубликована: Июнь 17, 2022

Nanomaterials (NMs) with unique structures and compositions can give rise to exotic physicochemical properties applications. Despite the advancement in solution-based methods, scalable access a wide range of crystal phases intricate is still challenging. Solid-state reaction (SSR) syntheses have high potential owing their flexibility toward multielemental under feasibly temperatures solvent-free conditions as well scalability simplicity. Controlling nanoscale features through SSRs demands strategic nanospace-confinement approach due risk heat-induced reshaping sintering. Here, we describe advanced SSR strategies for NM synthesis, focusing on mechanistic insights, novel phenomena, underlying principles using series examples different categories. After introducing history classical SSRs, key theories, definitions central topic, categorize various modern based surrounding solid-state media used nanostructure growth, conversion, migration nanospace or dimensional confinement. This comprehensive review will advance quest new materials design,

Язык: Английский

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A general approach to high-entropy metallic nanowire electrocatalysts

Matter, Год журнала: 2022, Номер 6(1), С. 193 - 205

Опубликована: Окт. 10, 2022

Язык: Английский

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Underfocus Laser Induced Ni Nanoparticles Embedded Metallic MoN Microrods as Patterned Electrode for Efficient Overall Water Splitting

Advanced Science, Год журнала: 2022, Номер 9(10)

Опубликована: Фев. 3, 2022

Transition metal nitrides have shown large potential in industrial application for realization of the high active and current density toward overall water splitting, a strategy to synthesize an inexpensive electrocatalyst consisting Ni nanoparticles embedded metallic MoN microrods cultured on roughened nickel sheet (Ni/MoN/rNS) through underfocus laser heating NiMoO4 ·xH2 O under NH3 atmosphere is posited. The proposed preparation mechanism infocus modes confirms that induced stress local temperature controllably rapidly prepared patterned Ni/MoN/rNS electrodes size. designed presents outstanding catalytic performance hydrogen evolution reaction (HER) with low overpotential 67 mV deliver 10 mA cm-2 oxygen (OER) small 533 200 . Density functional theory (DFT) calculations Kelvin probe force microscopy (KPFM) further verify constructed interface Ni/MoN absorption Gibbs free energy (ΔGH* ) (-0.19 eV) similar electrical conductivity between MoN, which can explain intrinsic activity Ni/MoN. Further, two-electrode system (-) Ni/MoN/rNS||Ni/MoN/rNS (+) employed water-splitting electrolyzer (460 120 h), being superior commercial electrode.

Язык: Английский

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Transient and general synthesis of high-density and ultrasmall nanoparticles on two-dimensional porous carbon via coordinated carbothermal shock

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Апрель 21, 2023

Abstract Carbon-supported nanoparticles are indispensable to enabling new energy technologies such as metal-air batteries and catalytic water splitting. However, achieving ultrasmall high-density (optimal catalysts) faces fundamental challenges of their strong tendency toward coarsening agglomeration. Herein, we report a general efficient synthesis uniformly dispersed on two-dimensional porous carbon. This is achieved through direct carbothermal shock pyrolysis metal-ligand precursors in just ~100 ms, the fastest among reported syntheses. Our results show that situ coordination (e.g., N → Co 2+ ) local ordering during millisecond-scale play crucial role kinetically dominated fabrication stabilization carbon films. The as-obtained samples exhibit excellent activity stability bifunctional catalysts oxygen redox reactions. Considering huge flexibility coordinated design, diversified single multielement (M = Fe, Co, Ni, Cu, Cr, Mn, Ag, etc) were generally fabricated, even systems well beyond traditional crystalline chemistry. method allows for transient well-dispersed with great simplicity versatility various application schemes.

Язык: Английский

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