First-Principles Calculations of Hydrogen Generation Due to Water Splitting on Polar GaN Surfaces

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题名:	First-Principles Calculations of Hydrogen Generation Due to Water Splitting on Polar GaN Surfaces
作者:	Chen,PT;Sun,CL;Hayashi,M
贡献者:	物理學系
关键词:	TOTAL-ENERGY CALCULATIONS;ELASTIC BAND METHOD;WAVE BASIS-SET;N-TYPE;MOLECULAR-DYNAMICS;SADDLE-POINTS;PHOTOELECTRODE;ADSORPTION;INTERFACE;NONPOLAR
日期:	2010
上传时间:	2012-06-11 10:42:56 (UTC+8)
出版者:	國立中央大學
摘要:	We present the chemical reactions leading to hydrogen gas generation via water splitting on polar GaN surfaces, which can be a significant source of renewable energy. To build an understanding at the atomic level of the activations afforded by the GaN (0001) and (000 (1) over bar) surfaces, we determine the reaction mechanism of hydrogen generation on the polar faces using density functional theory calculations. The calculation results show that the first H splitting from water can occur with ground-state electronic structures; the barriers of H(2)O splitting are 0.10 and 0.34 eV on the Ga-face and the N-face, respectively. However, the second H splitting requires huge energies of 1.42 and 1.73 eV, respectively, on the Ga-face and the N-face. Although the polar GaN surface can catalyze the first hydrogen splitting from water, we suggest that photoexcitation should be necessary for the second splitting.
關聯:	JOURNAL OF PHYSICAL CHEMISTRY C
显示于类别:	[物理學系] 期刊論文

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