气候变化领域集成服务门户(CCPortal): Charged interfaces: Electrochemical and mechanical effects

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DOI	10.1039/c7ee03400h
	Charged interfaces: Electrochemical and mechanical effects
	Vikrant K.S.N.; Chueh W.C.; García R.E.
发表日期	2018
ISSN	17545692
起始页码	1993
结束页码	2000
卷号	11 期号:8
英文摘要	We establish a comprehensive space-charge treatment that includes electrochemomechanical effects to physically describe the equilibrium and transport properties of charged interfaces in ion-conducting solids. The theory is consistent with the laws of thermodynamics and Maxwell's equations and naturally includes the free energy contributions of the chemical, electrical, and mechanical fields at and in the vicinity of homo- and heterointerfaces. In the dilute limit, and in the absence of chemomechanical stresses, the theory reduces to the classic, well-established Gouy-Chapman description. In the strong substitution limit, the model naturally predicts the appearance of a Mott-Schottky-type layer and reproduces the well known experimentally observed behavior, including grain boundary solute segregation. We demonstrate the validity of this theory for polycrystalline GdyCe1-yO2-y/2, GCO. In the low substitution limit, electrochemical and chemomechanically-induced stresses favor the segregation of which locally expands the crystalline lattice, and thus promotes the formation of a wide depletion zone of oxygen vacancies in front of the interface, negatively impacting the macroscopic ionic conductivity. For high gadolinia substitution, interface segregation induces compressive stresses of 45 to 700 MPa and a weakly tensile region in the vicinity of the GCO homointerface, as a result of coupled, long range, electrochemomechanical interactions. The accumulation of gadolinium defects at the grain boundary locks-in oxygen vacancies, which in turn suppresses the depletion zone from the extended immediate neighborhood and decreases its macroscopic ionic conductivity. This is the first model where the grain boundary core explicitly includes chemomechanical effects. © 2018 The Royal Society of Chemistry.
英文关键词	Charged particles; Free energy; Grain boundaries; Ionic conductivity; Maxwell equations; Oxygen vacancies; Crystalline lattice; Electrochemomechanical; Energy contribution; Grain boundary cores; Interface segregation; Laws of thermodynamics; Macroscopic ionic conductivity; Solute segregation; Segregation (metallography); electrochemical method; gadolinium; grain boundary; heterocyclic oxygen compound; polymer; thermodynamics
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190168
作者单位	School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States; Material Science and Engineering, Stanford UniversityCA 94305, United States
推荐引用方式 GB/T 7714	Vikrant K.S.N.,Chueh W.C.,García R.E.. Charged interfaces: Electrochemical and mechanical effects[J],2018,11(8).
APA	Vikrant K.S.N.,Chueh W.C.,&García R.E..(2018).Charged interfaces: Electrochemical and mechanical effects.Energy & Environmental Science,11(8).
MLA	Vikrant K.S.N.,et al."Charged interfaces: Electrochemical and mechanical effects".Energy & Environmental Science 11.8(2018).