Enhancement of active sites and stability by ion exchange in 3D ZIF-L for electrochemical energy storage
Year: 2025
Type: article
Abstract: The practical application of metal–organic frameworks (MOFs) for energy storage is faced with great challenges, such as poor structural stability and limited active sites. Herein, we have co-designed a three-dimensional (3D) self-assembled hexagonal zeolitic imidazolate framework-L (ZIF-L) structure with a 3D conformation that greatly reduces the self-aggregation of two-dimensional (2D) layered materials. Due to the rational design of the specific morphology and atomically different coordination abilities of Ni2+ and Co2+ in the framework, the micro-nano electric field is constructed, and the structural stability and electrochemistry reaction activity of ZIF-L are obviously improved. Moreover, the consecutive hollow structure is also formed by regulating the Ni–Co ratio, which can significantly enhance the specific capacitance and cycling stability of the Ni-ZIF-L electrode through the formation of fast electrolyte ions transfer channels. Consequently, the Ni-ZIF-L-40 electrode exhibits a high specific capacity (568.9 F·g−1 at 0.5 A·g−1) and long cycle stability (89.5% retention after 5000 cycles at 5 A·g−1). In addition, the Ni-ZIF-L-40//activated carbon (AC) asymmetric supercapacitor assembled using AC also shows an excellent cycling stability (91.1% retention after 4000 cycles at 5 A·g−1). This study may open a new window for the practical application of intrinsic MOFs-based electrodes for energy storage and conversion.
Source: Nano Research
Institutions: Yangzhou University, Nanjing University
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,290
OpenAlex ID: W4408787160