Atomic origins of water-vapour-promoted alloy oxidation

doi:10.1038/s41563-018-0078-5

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	Atomic origins of water-vapour-promoted alloy oxidation
	Zhu, ZH ; Luo, LL ; Su, M 2,3,4; Yan, PF ; Zou, LF ; Schreiber, DK ; Baer, DR ; Zhou, GW ; Wang, YT; Bruemmer, SM
刊名	NATURE MATERIALS
	2018
卷号	17 期号:6 页码:514
关键词	TRANSMISSION ELECTRON-MICROSCOPY OXIDE-GROWTH DYNAMICS VISUALIZATION ADHERENCE SCALES CR ATMOSPHERES INTERFACE CATALYSIS
ISSN号	1476-1122
DOI	10.1038/s41563-018-0078-5
英文摘要	The presence of water vapour, intentional or unavoidable, is crucial to many materials applications, such as in steam generators, turbine engines, fuel cells, catalysts and corrosion(1-4). Phenomenologically, water vapour has been noted to accelerate oxidation of metals and alloys(5,6). However, the atomistic mechanisms behind such oxidation remain elusive. Through direct in situ atomic-scale transmission electron microscopy observations and density functional theory calculations, we reveal that water-vapour-enhanced oxidation of a nickel-chromium alloy is associated with proton-dissolution-promoted formation, migration, and clustering of both cation and anion vacancies. Protons derived from water dissociation can occupy interstitial positions in the oxide lattice, consequently lowering vacancy formation energy and decreasing the diffusion barrier of both cations and anions, which leads to enhanced oxidation in moist environments at elevated temperatures. This work provides insights into water-vapour-enhanced alloy oxidation and has significant implications in other material and chemical processes involving water vapour, such as corrosion, heterogeneous catalysis and ionic conduction.
学科主题	Chemistry ; Materials Science ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/22891]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.SUNY Binghamton, Multidisciplinary Program Mat Sci & Engn, Binghamton, NY USA 2.Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA 3.Pacific Northwest Natl Lab, Computat Math Grp, Richland, WA 99352 USA 4.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing, Peoples R China 5.Univ Chinese Acad Sci, Sch Phys Sci, Beijing, Peoples R China 6.SUNY Binghamton, Dept Mech Engn, Binghamton, NY USA 7.Schreiber, Daniel K.; Bruemmer, Stephen M.] Pacific Northwest Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA
推荐引用方式 GB/T 7714	Zhu, ZH,Luo, LL,Su, M,et al. Atomic origins of water-vapour-promoted alloy oxidation[J]. NATURE MATERIALS,2018,17(6):514.
APA	Zhu, ZH.,Luo, LL.,Su, M.,Yan, PF.,Zou, LF.,...&Wang, CM.(2018).Atomic origins of water-vapour-promoted alloy oxidation.NATURE MATERIALS,17(6),514.
MLA	Zhu, ZH,et al."Atomic origins of water-vapour-promoted alloy oxidation".NATURE MATERIALS 17.6(2018):514.