Polarity- and Pressure-Dependent Hydrogen Dynamics on ZnO Polar Surfaces Revealed by Near-Ambient-Pressure X-ray Photoelectron Spectroscopy

doi:10.1021/acs.jpcc.0c08881

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	Polarity- and Pressure-Dependent Hydrogen Dynamics on ZnO Polar Surfaces Revealed by Near-Ambient-Pressure X-ray Photoelectron Spectroscopy
	Z. R. Ma,K. Yang,X. Lian,S. Sun,C. D. Gu,J. L. Zhang,D. West,S. B. Zhang,L. Liu,K. D. Yuan,Y. Y. Sun,H. X. Li and W. Chen
	2020
发表期刊	Journal of Physical Chemistry C
ISSN	1932-7447
卷号	124 期号:46 页码:25431-25436
摘要	ZnO-based catalysts have been widely used in industrial reactions involving syngas conversions. Hydrogen dynamics on the surface of the catalyst is an essential process for understanding the mechanisms of such reactions. As a polar material, however, the role of ZnO surface polarity on hydrogen dynamics has not been studied under operando conditions. Here, we investigate the behavior of polar (0001) and (000 (1) over bar) surfaces of single-crystal ZnO under different H-2 pressures using near-ambient-pressure X-ray photoelectron spectroscopy. We found that the (000 (1) over bar) surface shows a monotonic and irreversible band bending with increasing H-2 pressure. In contrast, the (0001) surface shows two opposite responses depending on H-2 pressure, which are reversible in pressure cycles. This polarity-and pressure-dependent hydrogen dynamics is clearly understood with the assistance from first-principles calculations. In particular, the amphoteric behavior of atomic H is identified to play a key role.
DOI	10.1021/acs.jpcc.0c08881
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收录类别	SCI
语种	英语
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64795
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Z. R. Ma,K. Yang,X. Lian,S. Sun,C. D. Gu,J. L. Zhang,D. West,S. B. Zhang,L. Liu,K. D. Yuan,Y. Y. Sun,H. X. Li and W. Chen. Polarity- and Pressure-Dependent Hydrogen Dynamics on ZnO Polar Surfaces Revealed by Near-Ambient-Pressure X-ray Photoelectron Spectroscopy[J]. Journal of Physical Chemistry C,2020,124(46):25431-25436.
APA	Z. R. Ma,K. Yang,X. Lian,S. Sun,C. D. Gu,J. L. Zhang,D. West,S. B. Zhang,L. Liu,K. D. Yuan,Y. Y. Sun,H. X. Li and W. Chen.(2020).Polarity- and Pressure-Dependent Hydrogen Dynamics on ZnO Polar Surfaces Revealed by Near-Ambient-Pressure X-ray Photoelectron Spectroscopy.Journal of Physical Chemistry C,124(46),25431-25436.
MLA	Z. R. Ma,K. Yang,X. Lian,S. Sun,C. D. Gu,J. L. Zhang,D. West,S. B. Zhang,L. Liu,K. D. Yuan,Y. Y. Sun,H. X. Li and W. Chen."Polarity- and Pressure-Dependent Hydrogen Dynamics on ZnO Polar Surfaces Revealed by Near-Ambient-Pressure X-ray Photoelectron Spectroscopy".Journal of Physical Chemistry C 124.46(2020):25431-25436.

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