Contact Potential Measurements on Tungsten Filaments

Langmuir, David B.

doi:10.1103/physrev.49.428

Cited by 28 publications

(3 citation statements)

References 14 publications

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“…Take the LSV/YSZ interfaces under the OCV condition as an example. e r,G , e r,H , and n 0 The change of F LSV YSZ might be insignificant for operating temperatures down to 800 1C, mainly because of the small temperature dependency of F. [75][76][77] mLSV e is experimentally measurable according to eqn (10), where E emf fulfils the Nernst equation. The Nernst equation predicts increased OCVs at lower temperatures.…”

Section: Double Layer Capacitance: Apparent Versus Intrinsicmentioning

confidence: 99%

Double layer capacitance of anode/solid-electrolyte interfaces

Chan

2011

Phys. Chem. Chem. Phys.

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The double layer of electrode/electrolyte interfaces plays a fundamental role in determining the performance of solid state electrochemical cells. The double layer capacitance is one of the most-studied descriptors of the double layer. This work examines a case study on lanthanum strontium vanadate (LSV)/yttria-stabilized zirconia (YSZ) interfaces exposed in solid oxide fuel cell anode environment. The apparent double layer capacitance is obtained from impedance spectroscopy. The intrinsic double layer capacitance is evaluated based on Stern's method in conjunction with the Volta potential analysis across LSV/YSZ interfaces. Both the apparent and the intrinsic double layer capacitances exhibit right-skewed volcano patterns, when the interfaces are subjected to anodic biases from 0 to 150 mV. The apparent double layer capacitance is about one order of magnitude larger than the intrinsic double layer capacitance. This discrepancy roots in the inconsistent surface areas that are involved. This analysis of capacitance would provide a more realistic TPB estimate of a working solid-state electrochemical device.

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Section: Double Layer Capacitance: Apparent Versus Intrinsicmentioning

confidence: 99%

Double layer capacitance of anode/solid-electrolyte interfaces

Chan

2011

Phys. Chem. Chem. Phys.

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“…The calibration has been performed in the whole temperature range studied, thus avoiding extrapolation. Moreover, the temperature of the metals investigated in several earlier works [7][8][9][10] was generally determined by extrapolation into a wide region as a function of the heating current, an operation which does not give a sufficient guarantee of confidence.…”

Section: Procedures Of Cathode Heating and Temperature Measurementsmentioning

confidence: 99%

Work function measurements of contact materials for industrial use

Akbi

Lefort

1998

J. Phys. D: Appl. Phys.

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The nature of the contact material is important for the characteristics of electric arcs and particularly for the electronic emission. Work functions of new industrial materials made with silver alloys and silver oxide alloys are not known at present. An experimental set-up is described which allows work function measurements from room temperature up to 700 K. The Fowler method was used for the measurement of the work function by the photoelectric effect. As a first application of the experimental device, work functions of metals (Ag, Cu, Ni, Sn and Zn) were determined. Furthermore, the influence of industrial surface treatment such as the application of electric arcs and repeated mechanical shocks on the Ag contact work surface was studied by SEM to observe their effect on electron work function. Breaking arcs in air cause a remarkable increase in the work function of the silver contact material by progressive formation of silver oxides.

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“…Take the LSV/YSZ interfaces under the OCV condition as an example. The change of LSV YSZ  might be insignificant for operating temperatures down to 800º C, mainly because of the small temperature dependency of Φ (Langmuir, 1936;Potter, 1940;Smith, 1949 Table 4-1 and Fig. 4-18, is controlled by the property of the H-P layer.…”

Section: Double Layer Capacitance: Apparent Versus Intrinsicmentioning

confidence: 99%

Lanthanum strontium vanadate in solid oxide fuel cells.

Ge¹

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Here I would like to express my most sincere appreciation and gratitude to my supervisor, Professor Chan Siew Hwa, for his considerate guidance and encouragement all throughout this PhD project. I have learnt so much for his expertise in the fields of solid oxide fuel cells and mathematical modelling. More than a supervisor, it is his personality, lifestyle, and working philosophy that inspire me all through this four-year odyssey. I thank Dr. Liu Qinglin for his initial effort on launching this PhD project. I also thank Mr. Chen Xinbing, Mr. Alireza Babaei, and Dr. Zhang Lan for miscellaneous discussions. Mr. Zhao Cunlu is acknowledged for introducing me the computational tool, Wolfram Mathematica ® 7. Ms. Fang Yanan (School of MSE) is acknowledged for her kindly help in X-ray powder diffraction characterization. My warmest acknowledgement goes to Dr. Fu Changjing for insightful discussions over versatile project topics. My thanks also extend to all technicians in Fuel Cell Laboratory (ERI@N), Materials Laboratory A, and Computer Aided Engineering Laboratory for technical guidance and assistance.

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Contact Potential Measurements on Tungsten Filaments

Cited by 28 publications

References 14 publications

Double layer capacitance of anode/solid-electrolyte interfaces

Double layer capacitance of anode/solid-electrolyte interfaces

Work function measurements of contact materials for industrial use

Lanthanum strontium vanadate in solid oxide fuel cells.

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