| 1. |
- Maryam, A., et al.
(författare)
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Preparation and application of LiSiC-oxide for low temperature solid oxide fuel cells
- 2021
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Ingår i: Digest Journal of Nanomaterials and Biostructures. - : VIRTUAL CO PHYSICS SRL. - 1842-3582. ; 16:2, s. 501-508
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Tidskriftsartikel (refereegranskat)abstract
- Semiconductors are well known as excellent materials in the field of exploring novel avenues which combine various fields in electronics, electrochemistry, etc for new functional device concepts. Lithium silicon carbide (LiSiC) is a well-known electrode material for Lithium ion batteries but relatively new for solid oxide fuel cells (SOFCs) and electrolyte-layer free fuel cells (EFFCs). In the present work, we have explored three categories of fuel cells based on mixed LiSiC-SDC (samarium doped ceria) in SOFC and LiSiC as a single component material with type (I) and without coating of a layer of 3C-SiC as EFFC type (II). All of three cells are sandwiched between Ni foams coated with NCAL (Ni0.8Co0.15Al0.05Li-oxide). The electrochemical performances of as prepared fuel cells are tested at 550 degrees C, which is substantially lower than in conventional fuel cell materials. The LiSiC based EFFC type (II) demonstrates better performance because of less ohmic resistance as compared to type (I) have more layers. This indicates that the LiSiC-SDC system has potential for fuel cell development in accordance with energy band structure and alignment.
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| 2. |
- Nawaz, Saima, et al.
(författare)
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Polyaniline inside the pores of high surface area mesoporous silicon as composite electrode material for supercapacitors
- 2022
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Ingår i: RSC Advances. - : ROYAL SOC CHEMISTRY. - 2046-2069. ; 12:27, s. 17228-17236
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Tidskriftsartikel (refereegranskat)abstract
- Mesoporous silicon (mSi) obtained by the magnesiothermic reduction of mesoporous silica was used to deposit polyaniline (PANI) in its pores, the composite was tested for its charge storage application for high performance supercapacitor electrodes. The mesoporous silica as confirmed by Small Angle X-ray Scattering (SAXS) has a Brunauer-Emmett-Teller (BET) surface area of 724 m(2)g(-1) and mean pore size of 5 nm. After magnesiothermic reduction to mSi, the BET surface area is reduced to 348 m(2)g(-1) but the mesoporousity is retained with a mean pore size of 10 nm. The BET surface area of mesoporous silicon is among the highest for porous silicon prepared/reduced from silica. In situ polymerization of PANI inside the pores of mSi was achieved by controlling the polymerization conditions. As a supercapacitor electrode, the mSi-PANI composite exhibits better charge storage performance as compared to pure PANI and mesoporous silica-PANI composite electrodes. Enhanced electrochemical performance of the mSi-PANI composite is attributed to the high surface mesoporous morphology of mSi with a network structure containing abundant mesopores enwrapped by an electrochemically permeable polyaniline matrix.
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| 3. |
- Rasheed, M. N., et al.
(författare)
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Enhanced electrical properties of nonstructural cubic silicon carbide with graphene contact for photovoltaic applications
- 2020
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Ingår i: Digest Journal of Nanomaterials and Biostructures. - Bucharest, Romania : S.C. Virtual Company of Phisics S.R.L. - 1842-3582. ; 15:3, s. 963-972
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Tidskriftsartikel (refereegranskat)abstract
- Cubic silicon carbide (3C-SiC) is successfully synthesized through a simple solid-state reaction technique at a comparatively low temperature without using any catalyst. The XRD data is also used to study other structural parameters of synthesized sample by using different method. Raman peak at 796 cm(-1) supports the XRD results. Si-C vibrational mode observed at 788 cm-1 in the FTIR spectrum further confirms the growth of 3C-SiC. UV-Vis spectroscopy is used to measure optical bandgap energy (E-g = 2.36 eV). Other optical parameters such as dielectric constant and refractive index of grown sample are also studied. Electrical performance is analyzed by using graphene contact with further evaluation of dark and light IV-measurements. The use of graphene contact establishes the enhancement of electrical conductivity of as-grown samples particularly when they are exposed to light. These findings indicate that the grown sample has comparatively better transport properties than conventional metal contacts under the illuminated conditions.
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