{'fraction_non_alphanumeric': 0.0136986301369863, 'fraction_numerical': 0.0015220700152207, 'mean_word_length': 5.202830188679245, '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}}
Reversible electronic charge transfer between au nanoparticles and electrochromic nio matrices upon electrochemical cycling

Cyclic voltammetry measurements and XANES spectra of hydrated NiO films with metallic Au nanoparticles embedded in them showed an electrochemical activity that modified their overall properties when incorporated in a galvanic cell. With respect to the electrochromic properties, Au nanoparticles played an important role in the final coloration state of the films by means of charge transfer between the gold oxide at the surface of metallic Au nanoparticles and the NiO x H y matrix. The results are consistent with the spectral changes seen in the coloration efficiency of films with approximately the same amount of electrochromic material (i.e., NiO x H y ). In addition, the incorporation of Au nanoparticles produced an increase of about 50% in the charge capacity of the films, a value that is expected to be a function of the average diameter of the Au nanoparticles. Such increments in charge capacity open up the possibility of using this kind of system in applications that require optimized charge capacity, like batteries. The present work was carried out to show the existence of an electronic charge transfer between Au nanoparticles (NPs) and the electrochromic NiO matrix.