{'fraction_non_alphanumeric': 0.02413793103448276, 'fraction_numerical': 0.029885057471264367, 'mean_word_length': 5.090909090909091, '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}}
Nickel oxide aerogel for high performance supercapacitor electrodes

Monolithic NiO aerogels were prepared by a facile citric acid assisted sol–gel method for supercapacitor electrodes. The highly porous aerogel microstructure is composed of a rigid nanoparticle backbone, which offers a large number of surface active sites for pseudocapacitive reactions and a high pore volume to facilitate ion transfer. As a result, the electrode made from the NiO aerogel annealed at 250 °C shows a high reversible specific capacitance of 901 F g−1 at 0.5 A g−1, a high rate capability (436 F g−1 at the charge/discharge current density of 20 A g−1) and good capacitance retention (93% of the initial specific capacitance after 3000 cycles at 10 A g−1). The result obtained in this work demonstrated that the nickel oxide aerogel holds great promise for supercapacitor applications.