MnOx thin film based electrodes: Role of surface point defects and structure towards extreme enhancement in specific capacitance

Achour, Amine; Guerra, Abdelouadoud; Moulaï, Fatsah; Islam, Mohammad; Hadjersi, Toufik; Ahmad, Iftikhar; Parvez, Shahid; Boukherroub, Rabah; Pireaux, Jean Jacques

doi:10.1016/j.matchemphys.2019.122487

Cited by 10 publications

(5 citation statements)

References 44 publications

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“…The areal capacitance (gravimetric capacitance) values at 0.25, 0.5, 1, 2, and 4 mA cm −2 current density are calculated to be 20.4, 16.8, 16.0, 15.8, and 15,7 mF cm −2 (51, 42.0, 40.0, 39.5, and 39.3 F g −1 ), respectively. The capacitive performance of MnO 2 /gra-H is comparable to other previously reported results in transition metal-based electrode materials (Table 4) [36][37][38][39][40]. In order to further research the long-term cycling stability of the MnO 2 /gra-H, MnO 2 /gra-H is performed over 1000 consecutive galvanostatic chargedischarge cycles at a constant current density of 4 mA cm −2 (Figure 5e).…”

Section: Resultssupporting

confidence: 82%

Extended Graphite Supported Flower-like MnO2 as Bifunctional Materials for Supercapacitors and Glucose Sensing

et al. 2021

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A simple, efficient, and cost-effective extended graphite as a supporting platform further supported the MnO2 growth for the construction of hierarchical flower-like MnO2/extended graphite. MnO2/extended graphite exhibited an increase in sp2 carbon bonds in comparison with that of extended graphite. It can be expected to display better electrical conductivity and further promote electron/ion transport kinetics for boosting the electrochemical performance in supercapacitors and glucose sensing. In supercapacitors, MnO2/extended graphite delivered an areal capacitance value of 20.4 mF cm−2 at 0.25 mA cm−2 current densities and great cycling stability (capacitance retention of 83% after 1000 cycles). In glucose sensing, MnO2/extended graphite exhibited a good linear relationship in glucose concentration up to about 5 mM, sensitivity of 43 μA mM−1cm−2, and the limit of detection of 0.081 mM. It is further concluded that MnO2/extended graphite could be a good candidate for the future design of synergistic multifunctional materials in electrochemical techniques.

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Section: Resultssupporting

confidence: 82%

Extended Graphite Supported Flower-like MnO2 as Bifunctional Materials for Supercapacitors and Glucose Sensing

et al. 2021

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“…Several physical and chemical synthesis techniques have been employed to produce MnOx films, including magnetron sputtering [13][14][15], atomic layer deposition (ALD) [16][17][18][19], thermal evaporation [20,21], pulsed laser deposition (PLD) [22][23][24][25][26][27], spray pyrolysis [28], plasma-enhanced chemical vapor deposition (PE-CVD) [29], molecular beam epitaxy (MBE) [30], sol-gel processes [31,32], successive ionic layer adsorption and reaction (SILAR) [33], hydrothermal reaction, and electrodeposition [32,34,35]. PLD is an effective physical technique exploiting ablation of a target by intense laser pulses to grow thin films on a proper substrate.…”

Section: Introductionmentioning

confidence: 99%

Nanostructure and phase engineering of manganese oxide thin films grown by pulsed laser deposition: A Raman and XRD study

Macrelli,

Monforte Ferrario,

Lamperti

et al. 2023

Phys. Rev. Materials

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Manganese, showing stable oxidation states spanning from +2 to +7, gives rise to a variety of oxides (MnOx) whose exploitation in several technological fields, such as energy conversion and storage, catalysis, sensing, environmental and biomedical engineering, is highly promising. Nevertheless, the chemical complexity and the structural richness of MnOx -involving mixed-valence and metastable species -make the correct identification by Raman spectroscopy challenging, further complicated by the laser sensitivity, the poor Raman activity, and the conflicting literature scenario. Moreover, a careful optimization of the material in terms of phase, structure, and morphology is highly desirable in view of the final application, where a precise control over the materials properties is essential. In this work, we discuss the capability of room-temperature pulsed laser deposition (PLD), followed by post-deposition thermal treatments, to successfully grow engineered and pure MnOx thin films, whose phase and morphology at the nanoscale can be totally decoupled and independently optimized. The detailed Raman characterization of these films enabled a clear identification of specific MnOx phases and poses the basis for the rationale of the MnOx Raman spectra. Starting from the same MnO PLD target, we obtained five different MnOx phases (i.e., MnO, Mn3O4, Mn2O3, amorphous MnO2, and α-MnO2) with tailored and tunable degree of porosity and crystallinity, by modulating process parameters like the O2 deposition partial pressure (vacuum -100 Pa), the type of substrate, and the annealing temperature (300-900 °C) and atmosphere (air/vacuum). The Raman spectroscopy reliability of the MnOx phase assignment was assessed by thoroughly investigating the impact of the exciting laser power, and it was further validated by energy-dispersive X-ray spectroscopy, X-ray photoemission spectroscopy, and X-ray diffraction, providing additional insights into the compositional properties and the crystalline structure.

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“…From the CV investigations, the maximum areal capacitances obtained are 38 mF cm À2 for undoped CuO prepared at 373 K, 59 mF cm À2 for Cr-doped CuO prepared at 373 K, 101 mF cm À2 for Cr-doped CuO prepared at 473 K, 209 mF cm À2 for Cr-doped CuO prepared at 573 K, and 111 mF cm À2 for Cr-doped CuO prepared at 673 K at the scan rate of 10 mV s À1 . It is noted that the Cr-doped CuO film electrode fabricated at 573 K shows the best electrochemical performance with the highest areal capacitance of 209 mF cm À2 compared with the other thin-film electrodes such as Mn-doped CuO (81 mF cm À2 at 10 mV s À1 ), 28 CuO (30 mF cm À2 at 5 mV s À1 ), 49 MnO x (110 mF cm À2 at 5 mV s À1 ), 50 V 2 O 5 /graphene (22.4 at 0.7 A m À2 ), 51 and TiO 2 @MnO 2 (22 mF cm À2 at 5 mV s À1 . 52 Figure 7F shows a decreasing trend in the areal capacitance with increasing scan rates, which might be due to inadequate time for exchange of ions among electrolyte and interface of electrode during the electrochemical reactions.…”

Section: Discussionmentioning

confidence: 99%

Microstructural and electrochemical supercapacitive properties of Cr‐doped CuO thin films: Effect of substrate temperature

et al. 2021

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MnOx thin film based electrodes: Role of surface point defects and structure towards extreme enhancement in specific capacitance

Cited by 10 publications

References 44 publications

Extended Graphite Supported Flower-like MnO2 as Bifunctional Materials for Supercapacitors and Glucose Sensing

Extended Graphite Supported Flower-like MnO2 as Bifunctional Materials for Supercapacitors and Glucose Sensing

Nanostructure and phase engineering of manganese oxide thin films grown by pulsed laser deposition: A Raman and XRD study

Microstructural and electrochemical supercapacitive properties of Cr‐doped CuO thin films: Effect of substrate temperature

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