An Ionic Sieve‐Integrated Conductive Interfacial Design to Simultaneously Regulate the Zn²⁺ Flux and Interfacial Resistance for Advancing Zinc‐Ion Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 24, 2024

Abstract Zinc‐ion batteries possess operation safety, high energy density, production flexibility and affordability, making them attractive for scalable storage. While Zn anodes face significant challenges from rampant dendrite growth electrolyte‐related side‐reactions in a complex interfacial microenvironment. The growing resistance further degrades the battery performance. An integrated anode design is reported to regulate simultaneously 2+ flux through situ confinement of sieve, that is, 2D CuBDC metal–organic framework mesoporous carbonaceous host. with sub‐nanometer channels selected efficient dehydration directional transport, lowering nucleation barrier by zincophilic Cu(II) N sites. Conductive meso‐carbon reduces blocks side‐reactions. Resultantly, modified demonstrate improved cycling stability lower voltage polarization, supported operando optical microscopy ex analysis. This work provides feasible strategy improving aqueous new insights on designing advancing zinc batteries.

Language: Английский

Assembly and Valence Modulation of Ordered Bimetallic MOFs for Highly Efficient Electrocatalytic Water Oxidation

Molecules, Journal Year: 2024, Volume and Issue: 29(24), P. 5845 - 5845

Published: Dec. 11, 2024

Metal synergy can enhance the catalytic performance, and a prefabricated solid precursor guide ordered embedding, of secondary metal source ions for rapid synthesis bimetallic organic frameworks (MM'-MOFs) with stoichiometric ratio 1:1. In this paper, Co-MOF-1D containing well-defined binding sites was synthesized by mechanical ball milling, which used as template induced introduction Fe to successfully assemble Co1Fe1-MOF-74@2 (where @2 denotes template-directed MOF-74). Its electrocatalytic performance is superior that conventional one-step-synthesized Co1Fe1-MOF-74@1 @1 one-step MOF-74), two sources, Co Fe, close Meanwhile, iron valence states (FeII FeIII) in were further regulated obtain materials Co1Fe1(II)-MOF-74@2 Co1Fe1(III)-MOF-74@2. The electrochemical test results confirm state has better than Co1Fe1(III)-MOF-74@2 oxygen evolution reaction (OER) process. This phenomenon related gradual increase Co1Fe1(II)-MOF-74@2, promotes continuous improvement MOF before reaching optimal steady makes OER reach optimum when FeII/FeIII mixed-valence reaches certain proportion. provides new idea directed optimization highly efficient catalysts.

Language: Английский