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- 저자 : Mostafa Saad Sayed (검색결과 3 건)
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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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Bo Gyeong Mun,Salh Alhammadi,Abdelrahman M Rabie,Mostafa Saad Sayed,Jae-Jin Shim,Woo Kyoung Kim 한국에너지학회 2021 한국에너지공학회 학술발표회 Vol.2021 No.4
In this work, we studied Ag doping effect on In<snb>2</sub>S<sub>3</sub> nanoparticles properties and on corresponding photocatalytic applications. The In<snb>2</sub>S<sub>3</sub> deposition was carried out using cost-effective simple chemical solution method. The XRD results showed that’s all the prepared nanoparticles have a polycrystalline cubic crystal structure with a (111)-plan preferred orientation. Also, The XRD results showed that’s all the prepared nanoparticles have a polycrystalline cubic crystal structure with a (111)-plan preferred orientation. The XRD results indicates Ag doping didn’t affect the In<snb>2</sub>S<sub>3</sub> crystal structure due to the absence of foreign phases. Further, the Ag-doped In<snb>2</sub>S<sub>3</sub> XRD peaks were shifting to lower 2θ indicating the success incorporation of Ag inside the In<snb>2</sub>S<sub>3</sub> lattice. The chemical bonding states and composition of the prepared nanoparticles were confirmed from XPS results, which the results showed all the samples has identical structure of In<snb>2</sub>S<sub>3</sub>. The photocatalytic ability of the pure In<snb>2</sub>S<sub>3</sub> and Ag-doped In<snb>2</sub>S<sub>3</sub> nanoparticles were investigated systematically and compared for the decomposition of methylene blue dye (MB), rhodamine b (Rhb) and tetracycline (TC) under visible light illumination. Overall, the Ag-doped In<snb>2</sub>S<sub>3</sub> exhibited better performance than pure In<snb>2</sub>S<sub>3</sub> of visible-light photocatalytic degradation of TC and MB with higher removal efficiency. In addition, the production of hydrogen via water splitting process was investigated and showed the Ag-doped In<snb>2</sub>S<sub>3</sub> samples have higher performance than pure In<snb>2</sub>S<sub>3</sub>.
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Manjiri A. Mahadadalkar,Ganesh Dhakal,Sumanta Sahoo,Deivasigamani Ranjith Kumar,Marjorie Lara Baynosa,Van Quang Nguyen,Mostafa Saad Sayed,Abdelrahman M. Rabie,Woo Kyoung Kim,Jae-Jin Shim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
Heterojunction TiO2/In2S3 composite photocatalyst was prepared using a simple low-temperature onestephydrothermal method. In2S3 nanosheets with a thickness of 1–5 nm were decorated with 20–30 nm TiO2 nanoparticles, forming a stable heterojunction. The electron transfer mechanism and bandalignment between TiO2 and In2S3 was studied using X-ray photoelectron spectroscopy and UV–visiblespectroscopy, which suggested the formation of an S-scheme heterojunction in TiO2/In2S3 composite. The TiO2/In2S3 composite with a 1:1 mole ratio showed 99.9% photocatalytic degradation ofRhodamine B within 20 minutes of solar light irradiation, which was better than the results for pristineTiO2, pristine In2S3, and their physical mixture, as well as any other previously reported materials of thesame kind. The as-prepared TiO2/In2S3 composite showed excellent stability (98% for Rhodamine B) evenafter five successive reuse cycles. This excellent performance of TiO2/In2S3 was attributed to the S-schemeheterojunction because of an internal electric field, columbic attraction, and band bending. A radical trappingstudy showed that superoxide radicals O2 contribute the most to the photocatalytic degradationof Rhodamine B followed by hydroxyl radicals (OH) and holes (hVB+ ). The use of a low synthesis temperatureand a simple, one-step formation method, with no secondary pollutants generated, makes this processan environmentally friendly and sustainable solution for cost-effective wastewater treatment,highlighting its future commercial applications.
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