{'fraction_non_alphanumeric': 0.02700348432055749, 'fraction_numerical': 0.0156794425087108, 'mean_word_length': 4.892307692307693, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Synthesis of NiO/Activated Carbon Composites and Their Application as Electrode Materials for Capacitors

Electrochemical capacitor (EC) based on NiO/activated carbon (AC) composite electrodes was investigated in this work to improve its electrochemical performance. NiO/AC composites were prepared as anode, while HyperCoal-based ACs were used as cathode for EC. The composites were characterized by means of X-ray diffraction and scanning electron microscopy. The porosity of HyperCoal-based ACs was characterized by N2 adsorption-desorption analyses. The electrochemical characterization of capacitor was examined using galvanostatic charge-discharge in 1 M and 8 M KOH electrolyte solution. The results show that NiO/AC composite electrodes exhibit a good electrochemical performance with a maximum specific capacitance (Cg) of 214.48 F g -1 at the chargedischarge current density of 40 mA g -1 in 1 M KOH electrolyte. Meanwhile, the Cg increases gradually with the increase of NiO content. In addition, the Cg of EC prepared in 8 M KOH aqueous is higher than that of EC prepared in 1 M KOH aqueous until the content of NiO reaches up to 55.6%.