Thiourea Treatment to Boost the Electrochemical Kinetics and Interfacial Stability of MnCo2O4.5 Spinel as a Novel Bifunctional Electrocatalyst for Rechargeable Zn–Air Batteries DOI
Wei Zhao,

Jiaxing Yan,

Zijian Wang

и другие.

Batteries & Supercaps, Год журнала: 2025, Номер unknown

Опубликована: Апрель 27, 2025

Developing efficient and cost‐effective bifunctional catalysts is pivotal in advancing Zn–air batteries (ZABs). In this study, a novel multiple‐surface modification strategy presented for MnCo 2 O 4.5 (MCO) spinel electrocatalyst with the pyrolysis of thiourea. The preparation involves hydrothermal process to obtain MCO, followed by surface varying concentrations thiourea (10%weight (wt), 30, 50%wt) under nitrogen atmosphere at 300 °C. 10% wt thiourea‐modified MCO (MCO‐10%T) achieves half‐wave potential 0.787 V vs. reversible hydrogen electrode oxygen reduction reaction an overpotential 450 mV 10 mA cm −2 evolution reaction, rivaling benchmark Pt/C‐RuO catalyst. This enhanced performance arises from synergistic effects sulfur doping, carbon coating, hierarchical porous structure introduced These features collectively improve electrical conductivity, increase active site availability, facilitate charge transfer. When employed as air cathode catalyst aqueous ZABs, MCO‐10%T demonstrates high specific capacity 800 mAh g −1 , power density 154 mW outstanding charge–discharge cycling stability. study offers important guidance designing activity stability, leveraging reconstruction strategies tailored materials.

Язык: Английский

Inhibiting Dissolution of Platinum with Atomic Rare Earth Bridged by Nitrogen to Boost Alkaline Hydrogen Evolution DOI
Peng Wang, Zhu Wang,

Jiarong Mu

и другие.

Small, Год журнала: 2025, Номер unknown

Опубликована: Апрель 17, 2025

Abstract The unfavorable water dissociation and continuous dissolution of Pt single‐atom catalysts significantly impede their practical application in alkaline anion exchange membrane electrolyzers (AEMWEs). Herein, by integrating the electron‐buffer functionality rare earth single atoms (RE = Pr, Ce, Gd, Sm) dispersed on N‐doped carbon substrates (N─C) with atoms, a novel catalyst Pt/RE‐N‐C is reported. constructed Pt─N─Ce bridge causes electron enrichment sites deficiency RE sites, which favors adsorption H ads OH , respectively, promotes dissociation. Meanwhile, increased covalency Pt─N bond inhibits detachment thermal vibration atoms. As representative, Pt/Ce─N─C requires an overpotential only 22 mV to reach current density 10 mA cm −2 . excellent mass activity 7.16 A mg −1 at 50 37.7 times higher than that commercial Pt/C (0.19 ). More importantly, AEMWE (with loading 32 µg ) as cathode exhibits ultralow potential (1.79 V) high stability industrial 1.0 This work demonstrates advantages using for high‐efficient energy conversion.

Язык: Английский

Процитировано

0
Thiourea Treatment to Boost the Electrochemical Kinetics and Interfacial Stability of MnCo2O4.5 Spinel as a Novel Bifunctional Electrocatalyst for Rechargeable Zn–Air Batteries DOI
Wei Zhao,

Jiaxing Yan,

Zijian Wang

и другие.

Batteries & Supercaps, Год журнала: 2025, Номер unknown

Опубликована: Апрель 27, 2025

Developing efficient and cost‐effective bifunctional catalysts is pivotal in advancing Zn–air batteries (ZABs). In this study, a novel multiple‐surface modification strategy presented for MnCo 2 O 4.5 (MCO) spinel electrocatalyst with the pyrolysis of thiourea. The preparation involves hydrothermal process to obtain MCO, followed by surface varying concentrations thiourea (10%weight (wt), 30, 50%wt) under nitrogen atmosphere at 300 °C. 10% wt thiourea‐modified MCO (MCO‐10%T) achieves half‐wave potential 0.787 V vs. reversible hydrogen electrode oxygen reduction reaction an overpotential 450 mV 10 mA cm −2 evolution reaction, rivaling benchmark Pt/C‐RuO catalyst. This enhanced performance arises from synergistic effects sulfur doping, carbon coating, hierarchical porous structure introduced These features collectively improve electrical conductivity, increase active site availability, facilitate charge transfer. When employed as air cathode catalyst aqueous ZABs, MCO‐10%T demonstrates high specific capacity 800 mAh g −1 , power density 154 mW outstanding charge–discharge cycling stability. study offers important guidance designing activity stability, leveraging reconstruction strategies tailored materials.

Язык: Английский

Процитировано

0