In:
Angewandte Chemie, Wiley, Vol. 134, No. 41 ( 2022-10-10)
Abstract:
Zn‐based aqueous batteries have attracted much attention because of their high theoretical‐capacity, safety, and low‐cost, yet the H 2 ‐evolution, qualification or inhibition mechanism investigations that are closely related to the dendrite‐growth are rare and challenging. Herein, a series of zincophilic metal‐covalent organic frameworks (e.g., Zn‐AAn‐COF, Zn‐DAAQ‐COF, and Zn‐DAA‐COF) have been explored as model‐platforms to manipulate the H 2 ‐evolution and Zn 2+ flux. Best of them, Zn‐AAn‐COF based cell only produces 0.002 mmol h −1 cm −2 H 2 , which is 〉 2 orders of magnitude lower than bare Zn. Noteworthy, it affords high stability for 3000 cycles (overpotential, 〈 79.1 mV) at 20 mA cm −2 in symmetric‐cell and enhanced cycling‐stability up to 6000 cycles at 2000 mA g −1 in the assembled full‐battery. Besides, mechanistic characterizations show that Zn‐AAn‐COF can enhance the energy‐barrier of H 2 ‐evolution and homogenize the ion‐distribution or electric‐filed to achieve high performance.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v134.41
DOI:
10.1002/ange.202210871
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
505868-5
detail.hit.zdb_id:
506609-8
detail.hit.zdb_id:
514305-6
detail.hit.zdb_id:
505872-7
detail.hit.zdb_id:
1479266-7
detail.hit.zdb_id:
505867-3
detail.hit.zdb_id:
506259-7
Permalink