Intrinsic properties of macroscopically tuned gallium nitride single crystalline facets for electrocatalytic hydrogen evolution.

Author(s) Hu, H.; Chang, B.; Sun, X.; Huo, Q.; Zhang, B.; Li, Y.; Shao, Y.; Zhang, L.; Wu, Y.; Hao, X.
Journal Chemistry
Date Published 2019 May 29

The anisotropy of crystal materials results in different physical and chemical properties on their different facets, warranting an in-depth investigation. Macroscopically facet-tuned, high-purity gallium nitride (GaN) single crystals were synthesised and machined, and electrocatalytic hydrogen evolution reaction (HER) was set as the template reaction to show the differences among the facets. The density functional theory (DFT) calculation revealed that the Ga and N sites of GaN (100) had a considerably smaller ΔGH* value than the metal Ga site of GaN (001) or N site of GaN (00-1), thereby indicating that GaN (100) should be more catalytically active for HER on account of its nonpolar facet. The subsequent experiments testified that the electrocatalytic performance of GaN (100) was considerably more efficient than that of other facets for both acidic and alkaline HERs. Moreover, the GaN crystal with a preferentially (100) active facet possessed an excellently durable alkaline electrocatalytic HER for more than 10 days. This work provides fundamental insights into the exploration of the intrinsic properties of materials and designing advanced materials for physicochemical applications.

DOI 10.1002/chem.201901395
ISSN 1521-3765
Citation Chemistry. 2019.

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