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Low-cost flexible supercapacitors with high-energy density based on nanostructured MnO2 and Fe2O3 thin films directly fabricated onto stainless steel.

Gund GS, Dubal DP, Chodankar NR, Cho JY, Gomez-Romero P, Park C, Lokhande CD - Sci Rep (2015)

Bottom Line: The results verify that the fabricated symmetric and asymmetric FSS-SCs present excellent reversibility (within the voltage window of 0-1 V and 0-2 V, respectively) and good cycling stability (83 and 91%, respectively for 3000 of CV cycles).Additionally, the asymmetric SC shows maximum specific capacitance of 92 Fg(-1), about 2-fold of higher energy density (41.8 Wh kg(-1)) than symmetric SC and excellent mechanical flexibility.Furthermore, the "real-life" demonstration of fabricated SCs to the panel of SUK confirms that asymmetric SC has 2-fold higher energy density compare to symmetric SC.

View Article: PubMed Central - PubMed

Affiliation: 1] Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur, - 416004 (M.S), India [2] Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, South Korea [3] Catalan Institute of Nanoscience and Nanotechnology, CIN2, ICN2 (CSIC-ICN), Campus UAB, E-08193 Bellaterra (Barcelona), Spain.

ABSTRACT
The facile and economical electrochemical and successive ionic layer adsorption and reaction (SILAR) methods have been employed in order to prepare manganese oxide (MnO2) and iron oxide (Fe2O3) thin films, respectively with the fine optimized nanostructures on highly flexible stainless steel sheet. The symmetric and asymmetric flexible-solid-state supercapacitors (FSS-SCs) of nanostructured (nanosheets for MnO2 and nanoparticles for Fe2O3) electrodes with Na2SO4/Carboxymethyl cellulose (CMC) gel as a separator and electrolyte were assembled. MnO2 as positive and negative electrodes were used to fabricate symmetric SC, while the asymmetric SC was assembled by employing MnO2 as positive and Fe2O3 as negative electrode. Furthermore, the electrochemical features of symmetric and asymmetric SCs are systematically investigated. The results verify that the fabricated symmetric and asymmetric FSS-SCs present excellent reversibility (within the voltage window of 0-1 V and 0-2 V, respectively) and good cycling stability (83 and 91%, respectively for 3000 of CV cycles). Additionally, the asymmetric SC shows maximum specific capacitance of 92 Fg(-1), about 2-fold of higher energy density (41.8 Wh kg(-1)) than symmetric SC and excellent mechanical flexibility. Furthermore, the "real-life" demonstration of fabricated SCs to the panel of SUK confirms that asymmetric SC has 2-fold higher energy density compare to symmetric SC.

No MeSH data available.


(a) XRD patterns (b) Raman spectra of MnO2 and Fe2O3 electrodes. (c) Nitrogen adsorption-desorption isotherms and (d) pore size distribution curves of powder MnO2 and Fe2O3 samples.
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f2: (a) XRD patterns (b) Raman spectra of MnO2 and Fe2O3 electrodes. (c) Nitrogen adsorption-desorption isotherms and (d) pore size distribution curves of powder MnO2 and Fe2O3 samples.

Mentions: The structural investigation of the as-prepared MnO2 and Fe2O3 electrodes on SS sheet were carried out through X-ray diffraction (XRD) analysis (Fig. 2(a)). The peaks marked with an asterisk are associated to the X-ray reflections from the SS substrate. The two characteristic peaks, for MnO2 electrodes and planes are found at 37° (400) and 64.5° (002) (denoted by clubs) and can be indexed matching the α- phase of MnO2 (JCPDS No. 44-0141). In the case of Fe2O3 electrodes diffraction peaks at 50° (024) and 63° (300) (marked as diamonds) are associated to the α-phase of Fe2O3 (JCPDS No. 06-0502)36. All the peaks are weak and broad, which is related to the thin deposits and to the poor crystallinity of electrode materials, respectively. Such a poor crystallinity is usually associated to a low lattice energy, which can improve the utilization ratio of electrode materials by allowing for an easy de-intercalation process7.


Low-cost flexible supercapacitors with high-energy density based on nanostructured MnO2 and Fe2O3 thin films directly fabricated onto stainless steel.

Gund GS, Dubal DP, Chodankar NR, Cho JY, Gomez-Romero P, Park C, Lokhande CD - Sci Rep (2015)

(a) XRD patterns (b) Raman spectra of MnO2 and Fe2O3 electrodes. (c) Nitrogen adsorption-desorption isotherms and (d) pore size distribution curves of powder MnO2 and Fe2O3 samples.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4513645&req=5

f2: (a) XRD patterns (b) Raman spectra of MnO2 and Fe2O3 electrodes. (c) Nitrogen adsorption-desorption isotherms and (d) pore size distribution curves of powder MnO2 and Fe2O3 samples.
Mentions: The structural investigation of the as-prepared MnO2 and Fe2O3 electrodes on SS sheet were carried out through X-ray diffraction (XRD) analysis (Fig. 2(a)). The peaks marked with an asterisk are associated to the X-ray reflections from the SS substrate. The two characteristic peaks, for MnO2 electrodes and planes are found at 37° (400) and 64.5° (002) (denoted by clubs) and can be indexed matching the α- phase of MnO2 (JCPDS No. 44-0141). In the case of Fe2O3 electrodes diffraction peaks at 50° (024) and 63° (300) (marked as diamonds) are associated to the α-phase of Fe2O3 (JCPDS No. 06-0502)36. All the peaks are weak and broad, which is related to the thin deposits and to the poor crystallinity of electrode materials, respectively. Such a poor crystallinity is usually associated to a low lattice energy, which can improve the utilization ratio of electrode materials by allowing for an easy de-intercalation process7.

Bottom Line: The results verify that the fabricated symmetric and asymmetric FSS-SCs present excellent reversibility (within the voltage window of 0-1 V and 0-2 V, respectively) and good cycling stability (83 and 91%, respectively for 3000 of CV cycles).Additionally, the asymmetric SC shows maximum specific capacitance of 92 Fg(-1), about 2-fold of higher energy density (41.8 Wh kg(-1)) than symmetric SC and excellent mechanical flexibility.Furthermore, the "real-life" demonstration of fabricated SCs to the panel of SUK confirms that asymmetric SC has 2-fold higher energy density compare to symmetric SC.

View Article: PubMed Central - PubMed

Affiliation: 1] Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur, - 416004 (M.S), India [2] Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, South Korea [3] Catalan Institute of Nanoscience and Nanotechnology, CIN2, ICN2 (CSIC-ICN), Campus UAB, E-08193 Bellaterra (Barcelona), Spain.

ABSTRACT
The facile and economical electrochemical and successive ionic layer adsorption and reaction (SILAR) methods have been employed in order to prepare manganese oxide (MnO2) and iron oxide (Fe2O3) thin films, respectively with the fine optimized nanostructures on highly flexible stainless steel sheet. The symmetric and asymmetric flexible-solid-state supercapacitors (FSS-SCs) of nanostructured (nanosheets for MnO2 and nanoparticles for Fe2O3) electrodes with Na2SO4/Carboxymethyl cellulose (CMC) gel as a separator and electrolyte were assembled. MnO2 as positive and negative electrodes were used to fabricate symmetric SC, while the asymmetric SC was assembled by employing MnO2 as positive and Fe2O3 as negative electrode. Furthermore, the electrochemical features of symmetric and asymmetric SCs are systematically investigated. The results verify that the fabricated symmetric and asymmetric FSS-SCs present excellent reversibility (within the voltage window of 0-1 V and 0-2 V, respectively) and good cycling stability (83 and 91%, respectively for 3000 of CV cycles). Additionally, the asymmetric SC shows maximum specific capacitance of 92 Fg(-1), about 2-fold of higher energy density (41.8 Wh kg(-1)) than symmetric SC and excellent mechanical flexibility. Furthermore, the "real-life" demonstration of fabricated SCs to the panel of SUK confirms that asymmetric SC has 2-fold higher energy density compare to symmetric SC.

No MeSH data available.