Tuning the morphology of manganese oxide nanostructures for obtaining both high gravimetric and volumetric capacitance

Pereira, Jones de A.; Lacerda, Janiny N.; Coelho, Izabella F.; Nogueira, Cauê de S. C.; Franceschini, D. F.; Ponzio, Eduardo A.; Mainier, Fernando B.; Xing, Yutao

doi:10.1039/d0ma00524j

Cited by 33 publications

(19 citation statements)

References 80 publications

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“…For all the synthesized materials, the binding energy values of Mn 2p 1/2 and Mn 2p 3/2 were in the range of 642.4–642.6 eV and 653.9–654.3 eV, respectively, Figure 2a–c. The binding energy values in these ranges signified the presence of Mn 4+ state, usually found in MnO 2 [49] . On the other hand, the presence of shoulder peaks around 647.2±0.5 eV attributed to the satellite peak for MnO (Mn 2+ ) impurity [50,51] .…”

Section: Resultsmentioning

confidence: 94%

“…The binding energy values in these ranges signified the presence of Mn 4 + state, usually found in MnO 2 . [49] On the other hand, the presence of shoulder peaks around 647.2 � 0.5 eV attributed to the satellite peak for MnO (Mn 2 + ) impurity. [50,51] Similarly, in the case of Ni, the binding energy values for Ni 2p 3/2 and Ni 2p 1/2 were found in the range of 855.1-856 eV and 872.9-873.5 eV, respectively for Ni(OH) 2 .…”

Section: Resultsmentioning

confidence: 99%

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Dual Matrix Influence on Ni(II) Rich Hybrid Catalyst for Electrochemical Methanol Oxidation Reaction

et al. 2022

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The influence of two different surface matrices, that is, zeolite‐Y and multi‐walled carbon nanotubes (MWCNTs), on the electrocatalytic ability of Ni(OH)2 combined with MnO2 has been studied. The Ni and Mn loaded in different ratio exhibited different current density with respect to the change in the nature of support. The MnO2−Ni(OH)2 catalyst decorated like a fish in a net‐stock at the interface of the zeolite‐Y and the MWCNT with high Ni(II) content provided the highest current density of 3.8 Amg−1 and 3.6 Amg−1 with platinum and graphitic rod as counter electrode, respectively. The study revealed that both the concentration of the Ni(II) as well as the nature of the support influenced the electrochemical behaviour of MnO2−Ni(OH)2. The electrochemical surface area as well as the durability of the catalyst having two different supports showed higher values in comparison to those in single matrix. The plot of current density vs. square root of scan rate showed diffusion control methanol oxidation process. The results predicted that the MnO2−Ni(OH)2 catalyst containing both zeolite‐Y and MWCNT surface indicated that under the highly basic condition it can withstand for long period without significant loss in current density during the methanol oxidation reaction process.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Dual Matrix Influence on Ni(II) Rich Hybrid Catalyst for Electrochemical Methanol Oxidation Reaction

et al. 2022

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“…The XPS Mn 2p , in Figure 3A, shows two main peaks at 641.8 and 653.9 eV returning to Mn 2p 3/2 and Mn 2p 1/2 , and indicating the presence of Mn 3+ in all doped samples, 46,47 along with the presence of a minor peak at around 641 eV, attributed to Mn 2+ 48 It is important to notice from the deconvolution the presence of Mn 4+ peak at 644.5 eV, which is remarkably at low amounts in La 0.9 Ca 0.1 Mn 0.1 Co 0.9 O 3 with respect to the rest of the batch. This indicates that doping rates equal or higher than 0.2 could be enough to promote the tetravalent oxidation state of manganese to compensate for the charge deficiency from simultaneous doping of divalent calcium 49 …”

Section: Resultsmentioning

confidence: 99%

“…This indicates that doping rates equal or higher than 0.2 could be enough to promote the tetravalent oxidation state of manganese to compensate for the charge deficiency from simultaneous doping of divalent calcium. 49 For further insight, Mn 3s has been deconvoluted and displayed in Figure S4. The coupling effect of non-ionized 3s electrons with 3d valence-band electrons is diagnosed by measurement of the energy separation (ΔE 3s ) summarized in Table S4.…”

Section: Resultsmentioning

confidence: 99%

A dual‐doping strategy of LaCoO ₃ for optimized oxygen evolution reaction toward zinc‐air batteries application

Hilal

Şanlı

Dekyvere

et al. 2022

Intl J of Energy Research

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Summary Perovskite‐based electrocatalysts are extensively investigated as a replacement for noble metals electrocatalysts for energy storage and conversion devices. Their interesting catalytic activity, low cost, and diversity are considered major advantages. In this work, a facile dual‐doping strategy has been conducted and yielded an astonishing upgrade of lanthanum cobaltite; fine‐tuning of both A and B sites with calcium and manganese has proven remarkably beneficial. The dual‐doping modulates the electronic configuration of both transition metals and raises the oxygen vacancies. Consequently, oxygen evolution reaction has been assessed and La0.8Ca0.2Mn0.2Co0.8O3 showed significantly improved overpotential and maximal current density in comparison with pristine LaCoO3. Furthermore, the ZAB exhibited a high open circuit potential and superior charge‐discharge cyclability, compared to Pt/C‐based electrodes. The current work explores the influence of simultaneous doping of the A and B sites in lanthanum perovskite oxides on electrocatalytic performance to encourage further exploration of such an approach in electrocatalysis. Novelty statement Simultaneous Ca and Mn dual‐doping of LaCoO3 in the A and B sites were successfully applied. The effects on the crystal structure, oxidation states, and electrocatalytic activity were studied. LCMC8228‐based ZAB has achieved a large discharge capacity of 88.1 mAh in comparison to the benchmark.

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“…We also investigated the ratio of pseudocapacitive and diffusion-controlled contributions to the deliverable capacity for Square B and no pattern electrodes. Here, pseudocapacitive and diffusion-controlled contribution ratios were estimated from the CV profiles in Figure a,b using Equation : , I false( V false) = k 1 υ + k 2 υ 1 / 2 where I ( V ) indicated the current value at a certain electrode potential [mA], k 1 and k 2 were best-fit constants, and υ was the scan rate [mV/s]. While k 1 υ implies the current density derived from pseudocapacitive charge storage responses, k 2 υ 1/2 represents the capacity associated with usual intercalation mechanisms.…”

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confidence: 99%

Patterning Design of Electrode to Improve the Interfacial Stability and Rate Capability for Fast Rechargeable Solid-State Lithium-Ion Batteries

et al. 2022

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Patterned electrodes were developed for use in solid-state lithium-ion batteries, with the ultimate goal to promote fast-charging attributes through improving electrochemically activated surfaces within electrodes. By a conventional photolithography, patterned arrays of SnO 2 nanowires were fabricated directly on the current collector, and empty channel structures formed between the resulting arrays were customized through modifying the size and interval of the SnO 2 patterns. The composite electrolyte comprising Li 7 La 3 Zr 2 O 12 and poly(ethylene oxide) was exploited to secure intimate interfacial contact at the electrode/ electrolyte junction while preserving ionic conductivity in the bulk electrolyte. The potential and limitation of the electrode patterning approach were then explored experimentally. For example, the electrochemical behaviors of patterned electrodes were investigated as a function of variations in microchannel structures, and compared with those of conventional film-type electrodes. The findings show promise to improve electrode dynamics when electrochemical reaction kinetics could be hindered by poor interfacial characteristics on electrodes.

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Tuning the morphology of manganese oxide nanostructures for obtaining both high gravimetric and volumetric capacitance

Abstract: Obtaining both high gravimetric capacitance (Cs_m) and high volumetric capacitance (Cs_V) in supercapacitors is still a great challenge. We prepared manganese oxide (MO) nanostructures by pulsed laser deposition, using metallic...

Cited by 33 publications

References 80 publications

Dual Matrix Influence on Ni(II) Rich Hybrid Catalyst for Electrochemical Methanol Oxidation Reaction

Dual Matrix Influence on Ni(II) Rich Hybrid Catalyst for Electrochemical Methanol Oxidation Reaction

A dual‐doping strategy of LaCoO ₃ for optimized oxygen evolution reaction toward zinc‐air batteries application

Patterning Design of Electrode to Improve the Interfacial Stability and Rate Capability for Fast Rechargeable Solid-State Lithium-Ion Batteries

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Tuning the morphology of manganese oxide nanostructures for obtaining both high gravimetric and volumetric capacitance

Abstract: Obtaining both high gravimetric capacitance (Cs_m) and high volumetric capacitance (Cs_V) in supercapacitors is still a great challenge. We prepared manganese oxide (MO) nanostructures by pulsed laser deposition, using metallic...

Cited by 33 publications

References 80 publications

Dual Matrix Influence on Ni(II) Rich Hybrid Catalyst for Electrochemical Methanol Oxidation Reaction

Dual Matrix Influence on Ni(II) Rich Hybrid Catalyst for Electrochemical Methanol Oxidation Reaction

A dual‐doping strategy of LaCoO 3 for optimized oxygen evolution reaction toward zinc‐air batteries application

Patterning Design of Electrode to Improve the Interfacial Stability and Rate Capability for Fast Rechargeable Solid-State Lithium-Ion Batteries

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A dual‐doping strategy of LaCoO ₃ for optimized oxygen evolution reaction toward zinc‐air batteries application