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Shaperelated optical and catalytic properties of wurtzitetype CoO nanoplates and nanorods

机译：纤锌矿型CoO纳米板和纳米棒的形状相关光学和催化性能

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In this paper, we report the anisotropic optical and catalytic properties of wurtzite-type hexagonal CoO (h-CoO) nanocrystals, an unusual nanosized indirect semiconductor material. h-CoO nanoplates and nanorods with a divided morphology have been synthesized via facile solution methods. The employment of flash-heating and surfactant tri-n-octylphosphine favors the formation of plate-like morphology, whereas the utilization of cobalt stearate as a precursor is critical for the synthesis of nanorods. Structural analyses indicate that the basal plane of the nanoplates is (001) face and the growth direction of the nanorods is along the c axis. Moreover, the UV-vis absorption spectra, the corresponding energy gap and the catalytic properties are found to vary with the crystal shape and the dimensions of the as-prepared h-CoO nanocrystals. Furthermore, remarkable catalytic activities for H_2 generation from the hydrolysis of alkaline NaBH_4 solutions have been observed for the as-prepared h-CoO nanocrystals. The calculated Arrhenius activation energies show a decreasing trend with increasing extension degree along the h001i direction, which is in agreement with the variation of the charge-transfer energy gap. Finally the maximum hydrogen generation rate of the h-CoO nanoplates exceeds most of the reported values of transition metal or noble metal containing catalysts performing in the same reaction system, which makes them a low-cost alternative to commonly used noble metal catalysts in H_2 generation from the hydrolysis of borohydrides, and might find potential applications in the field of green energy.
机译：在本文中，我们报告了纤锌矿型六角形CoO（h-CoO）纳米晶体（一种不寻常的纳米级间接半导体材料）的各向异性光学和催化性能。已通过简便的溶液方法合成了h-CoO纳米板和具有不同形态的纳米棒。闪蒸加热和表面活性剂三正辛基膦的使用有利于板状形态的形成，而硬脂酸钴作为前体的利用对于纳米棒的合成至关重要。结构分析表明，纳米板的底面为（001）面，纳米棒的生长方向为c轴。此外，发现UV-vis吸收光谱，相应的能隙和催化性能随所制备的h-CoO纳米晶体的晶体形状和尺寸而变化。此外，对于制备的h-CoO纳米晶体，已经观察到由碱性NaBH_4溶液的水解产生的H_2的显着催化活性。计算出的阿累尼乌斯活化能随沿h001i方向的扩展程度的增加而呈下降趋势，这与电荷转移能隙的变化一致。最后，h-CoO纳米板的最大氢生成速率超过了在相同反应系统中执行的大多数报道的含过渡金属或含贵金属的催化剂的报告值，这使其成为了H_2生成中常用贵金属催化剂的低成本替代品硼氢化物的水解，可能会在绿色能源领域找到潜在的应用。

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