Facile Gram-Scale Synthesis of NiO Nanoflowers for Highly Selective and Sensitive Electrocatalytic Detection of Hydrazine Rayse M. Ferreira, Franciele M. Morawski, Emanuel C. Pessanha, Scarllett L. S. de Lima, Diana S. da Costa, et al. ACS Omega, 2023 The design and development of efficient and electrocatalytic sensitive nickel oxide nanomaterials have attracted attention as they are considered cost-effective, stable, and abundant electrocatalytic sensors. However, although innumerable electrocatalysts have been reported, their large-scale production with the same activity and sensitivity remains challenging. In this study, we report a simple protocol for the gram-scale synthesis of uniform NiO nanoflowers (approximately 1.75 g) via a hydrothermal method for highly selective and sensitive electrocatalytic detection of hydrazine. The resultant material was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. For the production of the modified electrode, NiO nanoflowers were dispersed in Nafion and drop-cast onto the surface of a glassy carbon electrode (NiO NF/GCE). By cyclic voltammetry, it was possible to observe the excellent performance of the modified electrode toward hydrazine oxidation in alkaline media, providing an oxidation overpotential of only +0.08 V vs Ag/AgCl. In these conditions, the peak current response increased linearly with hydrazine concentration ranging from 0.99 to 98.13 μmol L–1. The electrocatalytic sensor showed a high sensitivity value of 0.10866 μA L μmol–1. The limits of detection and quantification were 0.026 and 0.0898 μmol L–1, respectively. Considering these results, NiO nanoflowers can be regarded as promising surfaces for the electrochemical determination of hydrazine, providing interesting features to explore in the electrocatalytic sensor field.
Li+ interstitials as the charge carriers in superionic lithium-rich anti-perovskites R. Mouta, E. M. Diniz, C. W. A. Paschoal Journal of Materials Chemistry A, 2016 Here, we report that in lithium-rich anti-perovskites (LiRAPs) with lithium halide deficiency, Li+ interstitials outnumber vacancies by 2–3 orders of magnitude, so that interstitials might be the actual charge carriers responsible for superionic conduction, as opposed to what has been assumed so far.
Concentration of charge carriers, migration, and stability in Li3OCl solid electrolytes Rodolpho Mouta, Maria Águida B. Melo, Eduardo M. Diniz, Carlos William A. Paschoal Chemistry of Materials, 2014 Recently, a new family of lithium-rich antiperovskites, Li3OA (A = halogen), which presents superionic conductivity, emerged as a promising both safe and commercially applicable solid electrolyte for lithium ion batteries. In this paper we employed classical atomistic quasi-static calculations to obtain the concentration of lithium vacancies and interstitials for stoichiometric samples of Li3OCl. The obtained concentrations as well as vacancy and interstitial migration energies reinforced the assumption that vacancies are the charge carriers in both stoichiometric and divalent metal doped samples, but raise the possibility that the high ionic conductivity in LiCl-deficient samples are in fact driven by interstitials, in opposition to what has been assumed so far. The Li3OCl stability at higher temperatures was investigated based on Gibbs energies of decomposition from 0 K up to 550 K. They are negative in the whole temperature range, which suggests that there exists a high Gibbs energy barrier between Li3...
Tolerance factor for pyrochlores and related structures R. Mouta, R. X. Silva, C. W. A. Paschoal Acta Crystallographica Section B Structural Science Crystal Engineering and Materials, 2013 In this work a new empirical tolerance factor for compounds with pyrochlore structure is proposed. This suggested tolerance factor is based on experimental structural data and on the tolerance factors proposed. However, since it does not depend on the structural data, this new tolerance factor permits the prediction of some properties of these compounds directly. Also, a good structure stability field for the pyrochlore formation is observed when this tolerance factor is used.
RECENT SCHOLAR PUBLICATIONS
Thermal expansion and electrical conductivity of the battery material Li3NbO4 in the cation-ordered rocksalt phase MR de Azevêdo, M Oliveira, L Wendy, J Vaz, RM Almeida, BC Viana, ... Journal of Alloys and Compounds 1016, 178786 , 2025 2025 Citations: 1
Facile Gram-Scale Synthesis of NiO Nanoflowers for Highly Selective and Sensitive Electrocatalytic Detection of Hydrazine RM Ferreira, FM Morawski, EC Pessanha, SLS de Lima, DS da Costa, ... ACS omega 8 (13), 11978-11986 , 2023 2023 Citations: 28
Sluggish anion transport provides good kinetic stability to the anhydrous anti-perovskite solid electrolyte Li 3 OCl JAS Serejo, JS Pereira, R Mouta, LGC Rego Physical Chemistry Chemical Physics 23 (11), 6964-6973 , 2021 2021 Citations: 19
Varistor behavior in a ternary system based on SnO2 doped with a hexavalent donor: SnO2-MnO2-WO3 ALW Buonocore, R Mouta, JC Gomes, CC dos Santos, EM Diniz, ... Journal of Alloys and Compounds 811, 151538 , 2019 2019 Citations: 16
Effect of Co-substitution on the Vibrational, Magnetic, and Dielectric Properties of Copper Ferrites Obtained by Microwave-Assisted Hydrothermal Method FSM Sinfrônio, JAO Rodrigues, FC Silva, RSP Fonseca, AS de Menezes, ... Journal of Electronic Materials 47 (11), 6821-6832 , 2018 2018 Citations: 15
Chitosan-Edible Oil Based Materials as Upgraded Adsorbents for Textile Dyes CC dos Santos, R Mouta, MCC Junior, SAA Santana, ... Carbohydrate Polymers 180, 182-191 , 2018 2018 Citations: 58
Li+ interstitials as the charge carriers in superionic lithium-rich anti-perovskites R Mouta, EM Diniz, CWA Paschoal Journal of Materials Chemistry A 4 (5), 1586-1590 , 2016 2016 Citations: 46
Mechanism of luminescent enhancement in Ba 2 GdNbO 6: Eu 3+ perovskite by Li+ co-doping MV dos Santos Rezende, MEG Valério, R Mouta, EM Diniz, ... Journal of Luminescence 158, 75-80 , 2015 2015 Citations: 14
Concentration of Charge Carriers, Migration, and Stability in Li3OCl Solid Electrolytes R Mouta, MAB Melo, EM Diniz, CWA Paschoal Chemistry of Materials 26 (24), 7137-7144 , 2014 2014 Citations: 113
Tolerance factor for pyrochlores and related structures R Mouta, RX Silva, CWA Paschoal Structural Science 69 (5), 439-445 , 2013 2013 Citations: 94
MOST CITED SCHOLAR PUBLICATIONS
Concentration of Charge Carriers, Migration, and Stability in Li3OCl Solid Electrolytes R Mouta, MAB Melo, EM Diniz, CWA Paschoal Chemistry of Materials 26 (24), 7137-7144 , 2014 2014 Citations: 113
Tolerance factor for pyrochlores and related structures R Mouta, RX Silva, CWA Paschoal Structural Science 69 (5), 439-445 , 2013 2013 Citations: 94
Chitosan-Edible Oil Based Materials as Upgraded Adsorbents for Textile Dyes CC dos Santos, R Mouta, MCC Junior, SAA Santana, ... Carbohydrate Polymers 180, 182-191 , 2018 2018 Citations: 58
Li+ interstitials as the charge carriers in superionic lithium-rich anti-perovskites R Mouta, EM Diniz, CWA Paschoal Journal of Materials Chemistry A 4 (5), 1586-1590 , 2016 2016 Citations: 46
Facile Gram-Scale Synthesis of NiO Nanoflowers for Highly Selective and Sensitive Electrocatalytic Detection of Hydrazine RM Ferreira, FM Morawski, EC Pessanha, SLS de Lima, DS da Costa, ... ACS omega 8 (13), 11978-11986 , 2023 2023 Citations: 28
Sluggish anion transport provides good kinetic stability to the anhydrous anti-perovskite solid electrolyte Li 3 OCl JAS Serejo, JS Pereira, R Mouta, LGC Rego Physical Chemistry Chemical Physics 23 (11), 6964-6973 , 2021 2021 Citations: 19
Varistor behavior in a ternary system based on SnO2 doped with a hexavalent donor: SnO2-MnO2-WO3 ALW Buonocore, R Mouta, JC Gomes, CC dos Santos, EM Diniz, ... Journal of Alloys and Compounds 811, 151538 , 2019 2019 Citations: 16
Effect of Co-substitution on the Vibrational, Magnetic, and Dielectric Properties of Copper Ferrites Obtained by Microwave-Assisted Hydrothermal Method FSM Sinfrônio, JAO Rodrigues, FC Silva, RSP Fonseca, AS de Menezes, ... Journal of Electronic Materials 47 (11), 6821-6832 , 2018 2018 Citations: 15
Mechanism of luminescent enhancement in Ba 2 GdNbO 6: Eu 3+ perovskite by Li+ co-doping MV dos Santos Rezende, MEG Valério, R Mouta, EM Diniz, ... Journal of Luminescence 158, 75-80 , 2015 2015 Citations: 14
Thermal expansion and electrical conductivity of the battery material Li3NbO4 in the cation-ordered rocksalt phase MR de Azevêdo, M Oliveira, L Wendy, J Vaz, RM Almeida, BC Viana, ... Journal of Alloys and Compounds 1016, 178786 , 2025 2025 Citations: 1
