Intrinsic Properties of Macroscopically Tuned Gallium Nitride Single-Crystalline Facets for Electrocatalytic Hydrogen Evolution
Intrinsic Properties of Macroscopically Tuned Gallium Nitride Single-Crystalline Facets for Electrocatalytic Hydrogen Evolution
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用于电催化析氢的宏观调谐氮化镓单晶面的固有特性
DOI：
10.1002/chem.201901395
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Hao Xiaopeng
中科院分区：
文献类型：
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作者：
Hu Haixiao;Chang Bin;Sun Xiucai;Huo Qin;Zhang Baoguo;Li Yanlu;Shao Yongliang;Zhang Lei;Wu Yongzhong;Hao Xiaopeng
晶体材料的各向异性导致不同方面的物理和化学性质不同，这需要深入研究。宏观面调谐，高纯度氮化镓（GaN）单晶的合成和机械加工，和电催化析氢反应（HER）被用作模型反应，以显示面之间的差异。DFT计算表明，GaN（100）的Ga和N位具有比GaN（001）的金属Ga位或GaN（00−1）的N位小得多的ΔGH* 值，从而表明GaN（100）由于其非极性面而对HER具有更高的催化活性。随后的实验证明，GaN（100）的电催化性能比其他方面的酸性和碱性HER的效率高得多。此外，具有优先（100）活性晶面的GaN晶体具有超过10天的优异的持久碱性电催化HER。 这项工作为探索材料的内在特性和设计用于物理化学应用的先进材料提供了基本见解。
The anisotropy of crystalline materials results in different physical and chemical properties on different facets, which warrants an in‐depth investigation. Macroscopically facet‐tuned, high‐purity gallium nitride (GaN) single crystals were synthesised and machined, and the electrocatalytic hydrogen evolution reaction (HER) was used as the model reaction to show the differences among the facets. DFT calculations revealed that the Ga and N sites of GaN (100) had a considerably smaller ΔGH*value than those of 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 the HER on account of its nonpolar facet. 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 had 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.