{'fraction_non_alphanumeric': 0.017811704834605598, 'fraction_numerical': 0.010178117048346057, 'mean_word_length': 5.7844827586206895, '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 and Characteristics of Hierarchical Co3O4 Powders

Co3O4 samples with hierarchical structure were synthesized successfully by the morphology-conserved transformation method. The XRD and XPS results show that the obtained samples have the typical spinel Co3O4 phase. The FT-IR spectrum shows that the precursors consist of Co–EG coordination polymer. The SEM images show that the obtained samples have the morphology of flower-like microspheres. The authors found that the key step of the obtaining of hierarchical Co3O4 flower-like microspheres by the morphology-conserved transformation method is to construct flower-like microstructures of the cobalt-containing precursors via manipulating the synthetic parameters in a facile ethylene glycol–mediated solvothermal reaction.