From 1D to 2D: Controllable Preparation of 2D Ni–MOFs for Supercapacitors
Xu Zhang, Zhiqing Liu, Xingchen Jin, Fengrui Liu, Xinlei Ma, Ning Qu, Lu Wang, Yuhan Tian, Qiang Zhang
Abstract
Controllable modulation strategies between one-dimensional (1D) and two-dimensional (2D) structures have been rarely reported for metal–organic frameworks (MOFs). Here, 1D, 1D/2D, and 2D Ni–MOFs can be facilely prepared by adjusting the ratio of Ni 2+ and the pyromellitic acid linker. A low-dimensional structure can shorten the transmission distance, while MOFs with a high Ni 2+ content can supply rich active sites for oxidation–reduction reactions. The 2D structure Ni-MOF with an optimized Ni 2+ /pyromellitic acid ratio presents a good performance of 1036 F g –1 at a current density of 1 A g –1 with a comparable rate performance of 62% at 20 A g –1 . The study may offer a facile design to control the structure of MOFs for employing in electrochemical energy storage.