Electron Shuttling of Iron‐Oxygen‐Cobalt Bridging in Cobalt Assembled Iron Oxyhydroxide Catalyst Boosts the Urea Oxidation Stability and Activity

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 21, 2025

Abstract Iron (Fe)‐based materials hold great potential as urea oxidation reaction (UOR) catalysts, however, the deactivation of active Fe‐oxyhydroxide (FeOOH) species induced by its dissolution during catalytic process under high current densities is still significant challenge. Herein, cobalt (Co) assembled FeOOH constructed, and formation Iron‐Oxygen‐Cobalt (Fe‐O‐Co) bridging triggers electron transfer from Co to Fe sites. This shuttling induces low valence state sites in FeOOH. Co‐FeOOH catalyst achieves a density 1000 mA cm −2 at voltage merely 1.59 V, showing substantial improvement compared pure (1.97 V). Meanwhile, urea‐assisted anion exchange membrane electrolyzer, after 24 h continuous operation , fluctuation 12.4%, significantly lower than that (49.9%). The situ experiments theoretical calculations demonstrate Fe‐O‐Co endows suppressive Fe‐segregation, fast charge Fe(Co)OOH phase negative‐shifted d‐band center metal sites, boosting UOR stability activity.

Language: Английский

Functionalized 3D Mo₂N Current Collectors Drive Multi‐Phase Ni‐based Synergy and Mitigate Surface Reconstruction for Enhanced Oxygen Evolution Catalysis

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 21, 2025

Abstract Electrochemical water splitting is a promising approach for sustainable hydrogen production, but the oxygen evolution reaction (OER) remains bottleneck due to sluggish kinetics, poor activity, and limited stability scalability. Here, Mo 2 N‐functionalized nickel designed foam (NF@Mo N) subsequently transform into N/NiSe/Ni P multi‐phase heterostructure through selenization phosphorization, address these challenges. The optimized NF@Mo catalyst integrates three key strategies: (I) functionalizing NF with N enhance conductivity charge transfer, (II) engineering collaborative multi‐interface optimize active sites (III) precisely controlling phase formation phosphorization mitigate surface reconstruction ensure long‐term stability. not only achieves an overpotential of 242 mV@10 mA cm −2 remarkable over 350 h, also low 395 mV at high current density 800 , outperforming pristine other control samples. Theoretical analysis reveals that N‐stabilized NiSe/Ni on enhances optimizes adsorption energies OER intermediates, leading improved catalytic performance This work provides new strategy designing high‐performance, non‐precious metal catalysts industrial applications advancing production.

Language: Английский

Mo-Migration-Induced Secondary Surface Reconstruction Enables Highly Efficient Oxygen Evolution Reaction

ACS Materials Letters, Journal Year: 2025, Volume and Issue: unknown, P. 2071 - 2079

Published: April 30, 2025

Language: Английский