A Photoresponsive Battery Based on a Redox-Coupled Covalent-Organic-Framework Hybrid Photoelectrochemical Cathode.
Angew Chem Int Ed Engl
; 61(50): e202214816, 2022 Dec 12.
Article
em En
| MEDLINE
| ID: mdl-36280902
ABSTRACT
Photoresponsive batteries promise flexible and low-cost solar-to-electrochemical energy storage (SES), but suffer from a limited SES efficiency due to rapid charge recombination and sluggish redox. Here, we present a porous-shell/core hybrid of covalent organic framework@carbon nanotube. This hybrid ensures long-lived separated charges (τave =3.0â
ns) by an electron transfer relay starting from the donor-acceptor molecules to the nanoscale heterojunction. These charges are further allowed to drive high-rate redox of -C=O/-C-O- and -C-N/-C=N+ with facile kinetics. Equipped with this photoelectrochemical cathode, a photoresponsive aqueous battery shows a 5-fold enhancement in SES efficiency (1.1 % at 1â
sun) over their counterparts. It is unveiled that the electron relay favors the formation of electron-enriching -C-O- and hole-enriching -C=N+ groups responsible for photoelectrochemical Zn2+ and OTf- storage cascade; and further, the general photo coupled ions transfer (PCIT) process is proposed. This work presents an inspiring photoelectrochemical cathode design and theoretical insight for photoresponsive batteries.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article