A copper based metal-organic framework as single source for the synthesis of electrode materials for high-performance supercapacitors and glucose sensing applications

• Published in: International journal of hydrogen energy Vol. 39; no. 34; pp. 19609 - 19620
• Main Authors: INAYAT ALI KHAN, BADSHAH, Amin, MUHAMMAD AMTIAZ NADEEM, HAIDER, Naghma, MUHAMMAD ARIF NADEEM
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier 20-11-2014
• Subjects: Alternative fuels. Production and utilization; APPLICATIONS; Applied sciences; Capacitance; Charge; Copper; Copper oxides; Current density; DENSITY; Electrode materials; ELECTRODES; Energy; Exact sciences and technology; Fuels; GLUCOSE; Hydrogen; Metal-organic frameworks; MICROSTRUCTURES; Nanostructure; ORGANIC COMPOUNDS; OXIDES; Voltammetry; High performance; Pyrolysis; Hydrogen; Supercapacitance; Photoelectron spectrometry; Glucose; Electrode material; Copper; Glucose sensing; X-ray photoelectron spectroscopy
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2014.09.106

The article describes the conversion of MOF-199 to Cu-Cu sub(2)O-CuO/C 700 (1) and Cu-Cu sub(2)O-CuO/C 800 (2) nanostructures by simple pyrolysis at 700 and 800 degree C under inert atmosphere. The X-ray photoelectron spectroscopy analysis reveals that the nanostructures Cu-Cu sub(2)O-CuO/C consist of graphitic carbon functionalized with carboxylic, carbonyl and hydroxyl functional groups with copper/copper oxide particles on surfaces. The electrochemical properties of 1 and 2 are evaluated as electrode material for supercapacitors using cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The results for the capacitive performance from cyclic voltammetry and galvanostatic charge/discharge reveal that both the samples have gravimetric capacitance greater than 750 F g super(-1) at a scan rate of 2 mV s super(-1) and current density of 2 mA cm super(-2). The samples retain about 43% of their initial capacitance even at high scan rate of 75 mV s super(-1). The cycling performance of the nanostructures illustrate that there is 5.5% capacitance loss after 3000 cycles. The sample 1 and 2 are washed with 1 mol L super(-1) HCl solution to obtain copper oxide free materials Cu/C 700 (3) and Cu/C 800 (4). Samples 3 and 4 are tested as electrocatalysts for glucose sensing and the cyclic voltammetry measurement shows enhanced current densities compared to the literature values.