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	Size and Substrate Effects Modulating Thermodynamics Properties of Hydrogenation in Pd/Au(111) Studied by Electrochemical PCT Isotherm
	Wang, Liang1,2; Kang, Shuai1,2; Tu, Shu3
	2018
摘要	To study the thermodynamic properties of Pd nanofilm grown on the specific substrates is an appropriate and pivotal method for understanding the reaction mechanisms of Pd-H system. Here, thermodynamics of hydrogen in Pd/Au(111) nanofilms are investigated firstly by electrochemical pressure-composition-temperature (PCT) isotherm measurements followed by Van't Hoff plotting, through which the enthalpy (Delta H) and entropy (Delta S) are determined well. The results show layer dependent thermodynamic properties of them. Pd nanofilms with thickness lower than 53 monolayers are less affinity to hydrogen because of substrate and size effects. However, the hydrides formed on them are stable at room temperature with the stability lower than that of bulk Pd, which indicates Pd nanofilms with appropriate and dominated orientation surface can be the viable coats of the hydrogen storage materials for intaking and releasing hydrogen efficiently, and also enlarging the duration of them. (C) 2018 The Electrochemical Society.
DOI	10.1149/2.0651809jes
发表期刊	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN	0013-4651
卷号	165期号:9页码:A1626-A1629
收录类别	SCI
WOS记录号	WOS:000440924800006
语种	英语