scholarly journals The Effect of Graphite Addition on Thermal Conductivity, Microstructure, and Electrochemical Impedance Spectroscopy of AlN Ceramics

2021 ◽  
Author(s):  
Tun Wang ◽  
Jianjun Xie ◽  
Lei Zhang ◽  
Tao Lu ◽  
Maomao Ding ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Activation Energy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Reduction Reaction ◽  
Oxygen Impurity ◽  
Carbon Reduction ◽  
Defects And Impurities ◽  
Multiphase Ceramics

Abstract Graphite/ aluminum nitride (AlN) multiphase ceramics are pressureless sintered under 1850°C using Dy2O3 and CaF2 as sintering additives. The effects of added graphite on microstructure, thermal conductivity, and electrochemical impedance spectroscopy of AlN ceramics were investigated. It was found that with 1wt% graphite addition the thermal conductivity of AlN in the through-plane to can achieve 210W/(m·K), which 25% higher than that of AlN without graphite. The graphite addition eliminates the oxygen impurity in AlN by a carbon reduction reaction in form of nanosized Dy2O3 particles. From electrochemical impedance spectroscopy manifested that the activation energy (Ea,g) of samples in grains is increased from 0.784 eV to 1.112 eV, suggesting that the concentrations of defects and impurities of Graphite/AlN multiphase ceramics are lower than those of monophase AlN ceramics.

scholarly journals Elucidation of the role of guanidinium incorporation in single-crystalline MAPbI3 perovskite on ion migration and activation energy

2020 ◽  
Vol 22 (20) ◽  
pp. 11467-11473 ◽  
Author(s):  
Apurba Mahapatra ◽  
Rashmi Runjhun ◽  
Jan Nawrocki ◽  
Janusz Lewiński ◽  
Abul Kalam ◽  
...  
Keyword(s):  
Activation Energy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Temperature Dependent ◽  
Ion Migration ◽  
Single Crystalline

We have studied the effect of guanidinium incorporation in a single-crystalline MAPbI3 perovskite on ion migration using temperature-dependent electrochemical impedance spectroscopy.

Synthesis and conductive performance of quaternary heteropoly acid H5SiW9Mo2VO40⋅13H2O

2018 ◽  
Vol 11 (04) ◽  
pp. 1850065 ◽  
Author(s):  
Zhirong Xie ◽  
Qingyin Wu ◽  
Fengwei He ◽  
Limei Ai
Keyword(s):  
Activation Energy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Relative Humidity ◽  
Proton Conductivity ◽  
Heteropoly Acid ◽  
Electrochemical Impedance ◽  
Temperature Range ◽  
Higher Temperature ◽  
Conductive Mechanism

A novel molybdenum- and vanadium-substituted quaternary heteropoly acid H5SiW9Mo2VO40[Formula: see text][Formula: see text][Formula: see text]13H2O has been synthesized and characterized by IR, UV, TG-DTA and XRD. The proton conductive performance was studied by the electrochemical impedance spectroscopy (EIS), which demonstrated that H5SiW9Mo2VO40[Formula: see text][Formula: see text][Formula: see text]13H2O shows excellent proton conduction performance with proton conductivity reaching [Formula: see text][Formula: see text]S[Formula: see text]cm[Formula: see text] at 60∘C and 80% relative humidity. In the temperature range of measurements, conductivity enhances with higher temperature. The proton conductive mechanism of this new heteropoly acid is the vehicle mechanism due to the activation energy of 31.91[Formula: see text]kJ [Formula: see text] mol[Formula: see text].

The Pt(111)/Electrolyte Interface under Oxygen Reduction Reaction Conditions: An Electrochemical Impedance Spectroscopy Study

Langmuir ◽  
2011 ◽  
Vol 27 (5) ◽  
pp. 2058-2066 ◽  
Author(s):  
Alexander S. Bondarenko ◽  
Ifan E. L. Stephens ◽  
Heine A. Hansen ◽  
Francisco J. Pérez-Alonso ◽  
Vladimir Tripkovic ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Electrochemical Impedance ◽  
Reduction Reaction ◽  
Spectroscopy Study ◽  
Reaction Conditions ◽  
Electrolyte Interface ◽  
Impedance Spectroscopy Study

Analysis of the Oxygen Reduction Reaction on Au/C Particles Using the Electrochemical Impedance Spectroscopy

2019 ◽  
Vol 20 (1) ◽  
pp. 205-210
Author(s):  
Gerardo Vázquez-Huerta ◽  
Guadalupe Ramos-Sanchez ◽  
René Antaño-López ◽  
Omar Solorza-Feria
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Electrochemical Impedance ◽  
Reduction Reaction
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