Wu Shi-Hong, Hsiao Chien-Hsuan, Hsieh Pei-Lun, Huang Xing-Fu, Huang Michael H
Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan.
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
Dalton Trans. 2021 Nov 2;50(42):15170-15175. doi: 10.1039/d1dt03150c.
CeO nanocubes with average sizes of 9, 13, and 18 nm have been synthesized by preparing a slightly basic aqueous mixture of Ce(NO), NaSO, and NHOH and heating the solution to 100 to 150 °C in 4 or 9 h. The nanocubes possess high crystalline quality. Their band gaps decrease gradually beyond the quantum confinement regime from 3.57 eV to 3.45 eV with increasing particle sizes. The 9 nm CeO nanocubes have the most positive valence band energy and correspondingly they exhibit the best electrochemical oxygen evolution reaction activity. Since band gaps of semiconductor nanocrystals can be tuned substantially through particle size control to yield different band energies, this fact can be utilized to enhance the electrochemical and photocatalytic properties.
通过制备Ce(NO)、NaSO和NHOH的弱碱性水性混合物，并在4或9小时内将溶液加热至100至150°C，合成了平均尺寸为9、13和18纳米的CeO纳米立方体。这些纳米立方体具有高结晶质量。随着粒径增加，它们的带隙在量子限制范围之外从3.57电子伏特逐渐减小到3.45电子伏特。9纳米的CeO纳米立方体具有最正的价带能量，相应地它们表现出最佳的电化学析氧反应活性。由于半导体纳米晶体的带隙可以通过粒度控制进行大幅调整以产生不同的带能量，这一事实可用于增强电化学和光催化性能。
