Microscopic evidence for the dissociation of water molecules on cleaved GaN(1100)

Shih Yu Wu, Liang Wei Lang, Pei Yang Cai, Yun Wen Chen, Yu Ling Lai, Ming Wei Lin, Yao Jane Hsu, Wei-I Lee, Jer Lai Kuo, Meng Fan Luo, Chien Cheng Kuo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The dissociation of water molecules absorbed on a cleaved non-polar GaN(1100) surface was studied primarily with synchrotron-based photoemission spectra and density-functional-theory calculations. The adsorbed water molecules are spontaneously dissociated into hydrogen atoms and hydroxyl groups at either 300 or 130 K, which implies a negligible activation energy (<11 meV) for the dissociation. The produced H and OH were bound to the surface nitrogen and gallium on GaN(1100) respectively. These results highlight the promising applications of the non-polar GaN(1100) surface in water dissociation and hydrogen generation.

Original languageAmerican English
Pages (from-to)1261-1266
Number of pages6
JournalPhysical Chemistry Chemical Physics
Issue number2
StatePublished - 2018


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