Modulating Coordination‐Driven Metal‐Oxygen Interaction Triggers Oxygen Evolution in Polymorphic and High‐Entropy Phosphate Electrocatalyst

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 15, 2024

Abstract Engineering metal‐oxygen (M‒O) interactions for catalyzing oxygen evolution reaction (OER) by tuning the coordination geometry of metal sites is crucial improving catalytic performance, which remains unexplored, especially in structurally diverse phosphate‐based catalysts. Herein, two NaCoPO 4 (NCP) polymorphs with distinct coordinations: orthorhombic‐ Pnma (CoO 6 ) and hexagonal‐P 5 denoted as O‐NCP H‐NCP, respectively are synthesized through unique quenching‐based synthesis, to investigate impact on M‒O covalency OER performance. The CoO (H‐NCP) polymorph delivered superior activity low overpotential at 10 mA cm −2 (η = 303 mV) long‐term stability than ‐based O‐NCP. Spectroscopic computational studies linked higher Co‒O covalency, enhanced electronic states near Fermi level, improved electrochemical reconstruction. Further, regulated mechanism, where high‐covalent follows conventional concerted proton‐electron transfer pathway, while entails a non‐concerted lattice participation unfavorable due downshifted O 2p band center. OER‐active tetrahedral demonstrated high‐entropy catalyst requiring lower η ≈284 mV. This study unlocks strategy designing next‐generation catalysts durability, harnessing interplay between covalency.

Язык: Английский

Pr₆O₁₁ clusters anchored CoFe-LDH on vertical graphene nanosheets as oxygen evolution electrocatalyst for long-term high-current-density seawater electrolysis

Journal of Materials Chemistry A, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 26, 2024

Our synthesized seawater OER electrocatalyst GP/VGSs-CoFe LDH-Pr 6 O 11 shows excellent catalytic activity and stability (with the aid of K 2 SO 4 ) in overall alkaline electrolysis, combining a previously reported HER NiMoN.

Язык: Английский