Stabilizing Interface pH by N-Modified Graphdiyne for Dendrite-Free and High-Rate Aqueous Zn-Ion Batteries.
Angew Chem Int Ed Engl
; 61(6): e202112304, 2022 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-34799952
ABSTRACT
Zn dendrite issue was intensively studied via tuning zinc ion flux. pH change seriously influences dendrite formation, while its importance has not been revealed. Here, we construct a N-modification graphdiyne interface (NGI) to stabilize pH by mediating hydrated zinc ion desolvation. Operando pH detection reveals pH stabilization by NGI. This works with pores in NGI to achieve dendrite-free Zn deposition and an increased symmetric cell lifespan by 116 times. Experimental and theoretical results owe pH stabilization to desolvation with a reduced activation energy achieved by electron transfer from solvation sheath to N atom. The efficient desolvation ensures that electron directly transfers from substrate to Zn2+ (rather than the coordinated H2 O), avoiding O-H bond splitting. Hence, Zn-V6 O13 battery achieves a long lifespan at 20.65â
mA cm-2 and 1.07â
mAh cm-2 . This work reveals the significance of interface pH and provides a new approach to address Zn dendrite issue.
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1
Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
China