Modulating Built‐In Electric Field Via N‐Doped Carbon Dots for Robust Oxygen Evolution at Large Current Density

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 16, 2025

Constructing a built-in electric field (BIEF) within heterostructures has emerged as compelling strategy for advancing electrocatalytic oxygen evolution reaction (OER) performance. Herein, the p-n type nanosheet array heterojunction Ni2P-NCDs-Co(OH)2-NF are successfully prepared. The variation in interaction affinity between nitrogen N-doped carbon dots (NCDs) and Ni/Co induces charge redistribution Co Ni Ni2P-NCDs-Co(OH)2-NF-3 heterostructure, thereby enhancing intensity of BIEF, facilitating electron transfer, markedly improving OER activity. optimized electrocatalyst, Ni2P-NCDs-Co(OH)2-NF-3, demonstrates remarkably low overpotential 389 mV at 500 mA cm-2, alongsides small Tafel slope 65 dec-1, expansive electrochemical active surface area (ECSA), impedance, outstanding stability exceeding 425 h Faradaic efficiency up to 96%. In situ Raman spectroscopy density functional theoretical (DFT) calculations elucidate mechanism, revealing that enhanced BIEF optimizes adsorption energy Co3+ OH- weakened desorption during reaction. work ponieeringly employed NCDs regulator effectively tuning achieving superior performance under large current density, thus charting new pathways development high-efficiency electrocatalysts.

Язык: Английский

Oxygen-Evolution Reaction on the Surface of Layered Manganese Oxide under Neutral Conditions: A Bioinspired Strategy Achieving Ultra-Low Overpotential

ACS Applied Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 1, 2025

Язык: Английский