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Low temperature sintered giant dielectric permittivity CaCu_(3)Ti_(4)O_(12) sol-gel synthesized nanoparticle capacitors

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Journal of Advanced Dielectrics 2017年第3期7卷 14-23页

作者： Venkata Sreenivas Puli Shiva Adireddy manish kothakonda Ravinder Elupula Douglas B.Chrisey Department of Physics and Engineering Physics Tulane University New OrleansLA 70115USA Department of Chemistry Tulane UniversityNew OrleansLA 70115USA

This paper reports on synthesis of polycrystalline complex perovskite CaCu_(3)Ti_(4)O_(12)(as CCTO)ceramic powders prepared by a sol–gel auto combustion method at different sintering temperatures and sintering times,*** effect of sintering time on the structure,morphology,dielectric and electrical properties of CCTO ceramics is *** the electrical properties via different sintering times is demonstrated for ceramic samples.X-ray diffraction(XRD)studies confirm perovskite-like structure at room *** grain growth is observed for ceramic *** dielectric permittivity was realized for CCTO *** dielectric permittivity was attributed to the internal barrier layer capacitance(IBLC)model associated with the Maxwell–Wagner(MW)polarization mechanism.

关键词： CCTO cubic giant dielectric permittivity IBLC grain growth.

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Two-dimensional titanium carbonitride MXene as a highly efficient electrocatalyst for hydrogen evolution reaction

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Materials Reports(Energy) 2022年第1期2卷 88-95页

作者： Kun Liang Anika Tabassum manish kothakonda Xiaodong Zhang Ruiqi Zhang Brianna Kenney Brent D.Koplitz Jianwei Sun Michael Nagui Department of Physics and Engineering Physics Tulane UniversityNew OrleansLA70118USA Department of Chemistry Tulane UniversityNew OrleansLA70118USA

In this paper,we report,for the first time,on the electrochemical catalytic activity of 2D titanium carbonitride MXene for hydrogen evolution reaction(HER).According to our study,2D titanium carbonitride exhibited much higher electrocatalytic activity than its carbide analogues,achieving an onset overpotential of 53 mV and Tafel slope of 86 mV dec^(-1),superior to the titanium carbide with onset overpotential of 649 mV and Tafel slope of 303 mV dec^(-1).The obtained onset overpotential for 2D titanium carbonitride is lower than those of all the reported transition metal carbides MXene catalysts without additives,so *** functional theory calculations were conducted to further understand the electrochemical *** calculation results show that a greater number of occupied states are active for Ti_(3)CNO_(2),revealing free energy for the adsorption of atomic hydrogen closer to 0 than that of Ti_(3)C_(2)O_(2).Both experimental and calculation studies demonstrate the excellent electrocatalytic behavior of titanium *** investigation of 2D titanium carbonitride opens up a promising paradigm for the conscious design of high-performance non-precious metal catalyst for hydrogen generation.

关键词： Two-dimensional Titanium carbonitride MXene Nanosheets Hydrogen evolution Electrocatalyst Density functional theory calculation

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