In Situ Growth of Zeolitic Imidazolate Framework‐67‐derived Nanoporous Carbon@K_0.5Mn₂O₄ for High‐Performance 2.4 V Aqueous Asymmetric Supercapacitors

Abstract

Aqueous asymmetric supercapacitors (ASCs) with a wide voltage window can effectively improve energy storage capacity of energy storage devices. Zeolitic imidazolate framework-67 (ZIF-67) was used as a precursor to prepare nanoporous carbon (NC), and K Mn O nanosheets were subsequently grown on the NC surface through a facile in situ redox process (denoted as NCMO). The electrode potential window of NCMO was extended to 1.2 V in a three-electrode system and the value of the potential window was higher than that of most reported manganese oxides. To assemble the asymmetric supercapacitor with a high voltage range, the as-prepared NCMO and NC (with a potential window of -1.2-0 V) were used as the positive and negative electrode, respectively. A 2.4 V NCMO//NC aqueous ASC was constructed and displayed a large energy density of 60 Wh kg at a power density of 1200 W kg and excellent rate performance (41 Wh kg even at a specific power density of 12.3 kW kg ) as well as good cycling stability (92.6 % capacitance retention over 10 000 cycles at 10 A g ). This work provides new opportunities for the development of high voltage ASCs with a high energy density for further practical application.

Comprehensive Insight into the Mechanism, Material Selection and Performance Evaluation of Supercapatteries

“… NiCoP/NiCo-OH30║ZIF-67 (MOF) derived porous carbon 1 A g −1 6 M KOH 101 F g −1 1.6 V 34 Wh kg −1 11.6 kW kg −1 92% after 1000 cycles [ 138 ] 12. K 0.5 Mn 2 O 4 nanosheets were subsequently grown on the carbon surface (NCMO)║ZIF-67 (MOF) derived nanoporous carbon 10 A g −1 1 M Na 2 SO 4 75 F g −1 2.4 V 60 Wh kg −1 12.3 kW kg −1 92.6% after 10,000 cycles [ 139 ] 13. TM-nanorods║MOF derived N-doped hierarchical porous carbon nanorods (TM-NPs) 1 A g −1 2 M KOH 161 F g −1 1.5 V 47.1 Wh kg −1 17.1 kW kg −1 83.2% after 10,000 cycles [ 140 ] 14.…”

“…Similarly, Li et al [ 138 ] synthesized a ZIF-67 (Co-based zeolitic imidazole framework)-derived porous carbon (PC) which obtained gravimetric specific capacitance of 150 F g −1 at current density of 1 A g −1 . Wei et al [ 139 ] prepared a ZIF-67-derived nanoporous carbon (NC) for supercapacitor applications. The prepared electrode delivered a specific capacitance of 269 F g −1 at a current density of 1 A g −1 along with 90.4% capacitance retention even after 10,000 cycles.…”

Drive towards Sonochemically Synthesized Ternary Metal Sulfide for High‐Energy Supercapattery

“…[13,16] Subsequently, researchers are adopting various smart strategies to improve the PD of SCs without negotiating the high PD and longer cyclic stability. [17] In this regard, a new hybrid architecture approach is under consideration. The amalgamation of a capacitive and a battery-grade material in a…”

High Energy Capacitors Based on All Metal‐Organic Frameworks Derivatives and Solar‐Charging Station Application

“…High power solar cell should be matched with a high power energy storage device, this is why electrochemical capacitor (EC) is often used as energy storage device in this system . Electrochemical capacitor has promising application foreground in this system due to its high specific power density, fast charging/discharging process, and long cycling life . For example, Karthik and co‐workers assembled a self‐sustaining power station by combining the electrochemical double‐layer capacitors (EDLCs) and a commercial solar cell, which exhibited an energy density of 17.7 Wh kg −1 and could power 40 light‐emitting diodes after charging .…”