Bimetallic metal organic framework-derived for both battery-like supercapacitor (electrolyte study) and hydrogen evolution reaction

Herein, a novel core in hollow shell NiCo2O4 (CHS-NCO) metal-organic framework is designed using aurin tricarboxylic acid as a three-organic dental ligand for supercapacitor and hydrogen evolution application. The XRD results and FE-SEM images confirm the formation of NiCo2O4 and the spherical structure of NiCo2O4. TEM images demonstrated the core in the hollow shell structure of NiCo2O4 metal-organic framework derived. The as-prepared material shows the highest specific capacitance of 531 and 695 F g(-1) in KOH and K3Fe(CN)(6) (10.0 mmol L-1), respectively. Furthermore, the NiCo2O4/activated carbon battery-like supercapacitor device with a high operating potential window of 1.60 V is assembled and shown excellent energy density, power density, and durability electrolytes. The as-prepared battery-like supercapacitor device can light up three color LEDs for more than 60 min. This noticeable performance suggests the potential use of CHS-NCO material as a positive electrode for high-performance battery-like supercapacitors and electronic devices. Also, the HER electrocatalyst shows the Tafel slope of 69 and 81 mV dec(-1) for Pt and graphite counter electrode, respectively. The current density of 10 mA cm(-2) achieves at the potential of -0.17 and -0.38 V (vs. RHE) for Pt and graphite counter electrode, respectively, and the electrode material exhibits high long-cycle life acidic media. So it is a good candidate for HER. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A novel core in hollow shell NiCo2O4 metal-organic framework with high specific capacitance and excellent electrochemical performance for supercapacitor and hydrogen evolution applications was designed. The NiCo2O4/activated carbon battery-like supercapacitor device showed high energy density and durability, while the HER electrocatalyst exhibited good electrocatalytic performance as a promising candidate for HER.