Constructing AgCoOx with Steering Intermediate Coverage for Efficient Kinetic Promotion of Electrochemical-/Solar-Driven Water Splitting

Langmuir, Год журнала: 2025, Номер unknown

Опубликована: Май 15, 2025

The rational design of robust electrocatalysts in view exceptional stability with fast kinetics toward the oxygen evolution reaction (OER) using a sustainable synthetic strategy is still underway. A simple wet chemical method established to report Ag- and Co-based oxalate (Ag@CoC2O4) for catalyzing OER, which demands 291/241 mV (GC/NF) reach 10 mA/cmgeo2, reduction 50 compared CoC2O4 Tafel slope 68/60 dec-1, chronopotentiometry 12/100 h, Faradaic efficiency 98%. silverization improved charge transport by reducing resistance increase Cdl from 1.02 mF cm-2, indicating abundant accessible catalytic sites. Further, was manifested calculating intrinsic geometric activities. mechanistic route analyzed proton order (ρRHE), suggesting proton-decoupled electron transfer (PDET) process. kinetic study via operando EIS Ag@CoC2O4 reveals enhanced OER kinetics, less resistance, more conductivity, faster kinetics. activity strengthened Bode at various potentials. temperature-dependent analysis inferred that decreased activation energy (5.39 kJ/mol) related (16.32 kJ/mol). Besides, alkaline electrolyzers solar cell-driven built anode achieve total water splitting (1.59 V @ mA/cmgeo2), establishing suitability practical applications. alternative process used produce zero-carbon green H2 further value-added electrocatalysis, thereby showing economic benefits oxidation exposing surface bulk active centers rapid electrolyte diffusion.

Язык: Английский

Dealloying treated FeCoNiCuMo high-entropy alloy as a self-supporting porous electrode for overall water splitting

Journal of environmental chemical engineering, Год журнала: 2025, Номер unknown, С. 117127 - 117127

Опубликована: Май 1, 2025

Язык: Английский

Single-Atom to Ultrasmall Au Nanoparticles Anchored on NiFe Layered Double Hydroxide as Catalyst for Oxygen and Hydrogen Evolution Reactions

ACS Applied Nano Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 20, 2024

Owing to the limited supply and high cost, rational design of precious metal-based catalysts is essential importance for boosting electrocatalytic activity. Herein, variation Au species from single-atoms ultrasmall nanoparticles (3–6 nm) deposited on NiFe-layered double hydroxide (NiFe-LDH) was investigated as a bifunctional electrocatalyst oxygen hydrogen evolution reactions. The brucite-like layered structure NiFe-LDH verified by X-ray diffraction. existence single-atom well local bonding environment were evaluated high-resolution transmission electron microscopy photoelectron spectroscopy. integration into single atoms metallic shows significant improvement in activity 1 M KOH. Single-atom Au/NiFe-LDH (2Au/NiFe-LDH, 0.21 wt % Au) delivers lowest overpotential 209 mV catalyze 10 mA cm–2 OER current density with Tafel slope 46.5 dec–1. On other hand, nanoparticles/NiFe-LDH (50Au/NiFe-LDH, 3.22 possesses an 150 at HER 134.5 For overall water splitting, under optimum conditions, 2Au/NiFe-LDH//50Au/NiFe-LDH couple requires cell potentials 1.62 1.78 V deliver 100 These findings provide insights effect decoration catalyst surface efficient performance production O2 H2 alkaline electrolyte.

Язык: Английский