{'fraction_non_alphanumeric': 0.029308323563892145, 'fraction_numerical': 0.035169988276670575, 'mean_word_length': 5.188405797101449, '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}}
Hierarchical Cu2O/CuO/Co3O4 core-shell nanowires: synthesis and electrochemical properties

We prepared hierarchical Cu2O/CuO/Co3O4 core–shell nanowires (NWs) via a facile chemical deposition method followed by calcination for use as the electrode of supercapacitors. The Cu2O/CuO/Co3O4 electrode showed a specific capacitance of 318 F g−1 at a current density of 0.5 A g−1. 80% of the original specific capacitance was retained after 3000 cycles at a current density of 5 A g−1. An asymmetric supercapacitor cell using Cu2O/CuO/Co3O4 NWs as the positive electrode and activated graphene as the negative electrode exhibited a maximum energy density of 12 Wh kg−1. The electrochemical properties of the electrode were strongly related to the hierarchical nanostructure, which not only provided rich active sites but also shortened ion transport pathways.