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RISS 인기검색어
- 검색키워드
- 저자 : Debananda Mohapatra (검색결과 3 건)
- 무료
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Sulfur Doping: Unique Strategy To Improve the Supercapacitive Performance of Carbon Nano-onions
Mohapatra, Debananda,Dhakal, Ganesh,Sayed, Mostafa Saad,Subramanya, Badrayyana,Shim, Jae-Jin,Parida, Smrutiranjan American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.8
<P>Recently, enhancement of the energy density of a supercapacitor is restricted by the inferior capacitance of negative electrodes, which impedes the commercial development of high-performance symmetric and asymmetric supercapacitors. This article introduces the in situ bulk-quantity synthesis of hydrophilic, porous, graphitic sulfur-doped carbon nano-onions (S-CNO) using a facile flame-pyrolysis technique and evaluated its potential applications as a high-performance supercapacitor electrode in a symmetric device configuration. The high-surface wettability in the as-prepared state enables the formation of highly suspended active conducting material S-CNO ink, which eliminates the routine use of binders for the electrode preparation. The as-prepared S-CNO displayed encouraging features for electrochemical energy storage applications with a high specific surface area (950 m<SUP>2</SUP> g<SUP>-1</SUP>), ordered mesoporous structure (∼3.9 nm), high S-content (∼3.6 at. %), and substantial electronic conductivity, as indicated by the ∼80% sp<SUP>2</SUP> graphitic carbon content. The in situ sulfur incorporation into the carbon framework of the CNO resulted in a high-polarized surface with well-distributed reversible pseudosites, increasing the electrode-electrolyte interaction and improving the overall conductivity. The S-CNOs showed a specific capacitance of 305 F g<SUP>-1</SUP>, an energy density of 10.6 W h kg<SUP>-1</SUP>, and a power density of 1004 W kg<SUP>-1</SUP> at an applied current density of 2 A g<SUP>-1</SUP> in a symmetrical two-electrode cell configuration, which is approximately three times higher than that of the pristine CNO-based device in a similar electrochemical testing environment. Even at 11 A g<SUP>-1</SUP>, the S-CNO||S-CNO device rendered an energy density (6.1 W h kg<SUP>-1</SUP>) at a deliverable power density of 5.5 kW kg<SUP>-1</SUP>, indicating a very good rate capability and power management during peak power delivery applications. Furthermore, it showed a high degree of electrochemical reversibility with excellent cycling stability, retaining ∼95% of its initial capacitance after more than 10 000 repetitive charge-discharge cycles at an applied current density of 5 A g<SUP>-1</SUP>.</P> [FIG OMISSION]</BR>
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Thi Hiep Han,Debananda Mohapatra,Neelima Mahato,Smrutiranjan Parida,Jun Ho Shim,Anh Thi Nguyet Nguyen,Van Quang Nguyen,조문환,Jae-Jin Shim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
In this study, highly graphitic nitrogen-doped carbon nano-onions (N-CNOs) were prepared by a onestep,direct, in situflame synthesis technique and their potential applications as catalysts for oxygenreduction reaction (ORR) in a microbial fuel cell (MFC) were evaluated for thefirst time. The ORR activityof the CNO, N-CNO, and the commercial Pt/C were measured using a rotating ring-disk electrode (RRDE). The reaction mechanism for the N-CNO was found to follow a four-electron transfer pathway and possessa higher onset potential in RRDE measurement than CNOs. The ORR activity of N-CNO was 5.4 timesbetter than that of CNO, which was attributed to the introduction of nitrogen to the carbon faramework. The MFC fabricated with the N-CNO cathode produced a maximum power density of 49.6 mW m–2, whichwas approximately double the performance of the CNO-based MFC. The performance of N-CNO was lowcompared to Pt/C but the cost per power was only 1/310th. These results confirmed that N-CNOs could beused as a low-cost alternative and an energy-efficient metal-free ORR catalyst for practical MFCapplications.
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N.S.K. Gowthaman,Debananda Mohapatra,P. Arul,Wei Sea Chang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
This paper describes the decoration of AuNPs on carbon nano-onions (CNO) followed by its fabrication onelectrode surface for the sensitive determination of environmental pollutant hydrazine (HZ). A greenultrasonication approach was employed to decorate the AuNPs on CNOs and it follows electroless deposition. HR-TEM results reveal that spherical 10 nm-sized AuNPs were well dispersed on 30 nm-sizedCNOs. The obtained 3.7 eV spin–orbit coupling in the XPS Au4f region suggests the successful decorationof Au(0) on CNO. The Au@CNO nanostructure was then directly attached on GC electrode surface by simpleimmersion and achieved through p–p stacking interaction and the resultant electrode exhibited highelectroactive surface area and lower resistivity when compared to the CNO fabricated electrode. TheAu@CNO electrode was utilized to determine HZ in effluent samples and delivered higher electrocatalyticactivity by showing lower onset potential than the bare and CNO fabricated electrodes. The increasedelectroactive area and high electronic conductivity of Au@CNO nanostructure are attributed to theoffered lowest detection limit of 12 109 M (S/N = 3) and larger sensitivity of 485.7 lA/mM cm2. The green and environmentally benign approached Au@CNO nanostructure leads to their successfulimplementation in the determination of HZ in effluent samples.
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