Cu-Metal Organic Framework Derived Multilevel Hierarchy (Cu/Cu_xO@NC) as a Bifunctional Electrode for High-Performance Supercapacitors and Oxygen Evolution Reaction

Abstract

The development of a MOFs-derived multilevel hierarchy in a single step still remains a challenging task. Herein, we have synthesized novel Cu-MOF via a slow diffusion method at ambient temperature and further utilized it as a precursor source for MOF-derived multilevel hierarchy (Cu/Cu x O@NC, x = 1 and 2). This studies suggest that the organic ligands served as a source of an N-doped carbon matrix encapsulated with metal oxide nanoparticles which were confirmed by various characterization techniques; further BET analysis reveals a surface area of 178.46 m2/g. The synthesized multilevel hierarchy was utilized as an electro-active material in a supercapacitor that achieved a specific capacitance of 546.6 F g–1 at a current density of 1 A g–1 with a higher cyclic retention of 91.81% after 10 000 GCD cycles. Furthermore, the ASC device was fabricated using Cu/Cu x O@NC as the positive electrode and carbon black as the negative electrode and utilized to enlighten the commercially available LED bulb. The fabricated ASC device was further employed for a two-electrode study which achieved a specific capacitance of 68 F g–1 along with a comparable energy density of 13.6 Wh kg–1. Furthermore, the electrode material was also explored for the oxygen evolution reaction (OER) in an alkaline medium with a low overpotential of 170 mV along with a Tafel slope of 95 mV dec–1 having long-term stability. The MOF-derived material has high durability, chemical stability, and efficient electrochemical performance. This work provides some new thoughts for the design and preparation of a multilevel hierarchy (Cu/Cu x O@NC) via a single precursor source in a single step and explored multifunctional applications in energy storage and an energy conversion system.

In situ growth of a redox-active metal–organic framework on electrospun carbon nanofibers as a free-standing electrode for flexible energy storage devices

“…The first is utilizing MOFs as templates/precursor sources via pyrolysis and the other method is utilizing conductive materials as hybrids or depositing them in the pores of MOFs. 21,22 Additionally, numerous conductive MOFs (c-MOFs) and redox-active MOFs have been explored for electrochemical energy storage, where these c-MOFs and redox-active MOFs have a distinct assembly with an atomic-level thickness. 23 Further, the abundant active sites on their surface and wide operating potential window result in great performances in domains related to renewable energy.…”

NiCo-compounds inside and outside N-doped carbon nanotubes to construct a double-enhanced hierarchical structure for high energy density supercapacitors

“…8,9 Metal organic framework (MOF) materials are a novel category of porous crystalline materials, characterized by the presence of coordination bonds that connect inorganic metal ions with organic ligands or clusters. 10 Prussian blue analogues (PBAs), a special type of MOF material, possess a high specific surface area and structural versatility due to their abundant pore structure. 11 They also offer uniform metal active sites, 12 making PBAs highly promising for electrochemical energy storage applications.…”

MOF-derived NiAl2O4/NiCo2O4 porous materials as supercapacitors with high electrochemical performance

“…The as-prepared sample showed a specific capacitance of 88.66 F g −1 at a current density of 1.1 A g −1 and a capacity retention of 90.05% after 2000 cycles at a current density of 8 A g −1 . Abbas et al 14 synthesized a novel Cu-MOF by a simple method and prepared MOF-derived multilevel hierarchy Cu/Cu x O@NC materials after annealing for 4 h. In a three-electrode system, the MOF-derived sample achieved a specific capacitance of 547 F g −1 at 1 A g −1 and a cyclic retention of 91.81% after 10 000 GCD cycles. Salehi et al 15 used one-step reduction electrochemistry to grow bimetal-terephthalate (CoZn-MOF) materials on nickel foam, which exhibited a specific capacitance of 1205 F g −1 and a capacity retention of 94.8% after 8000 cycles at a current density of 2 A g −1 .…”