Photoelectrochemical performance of nanosphere and nanorod hematite
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    Abstract:

    In this study, nanosphere and nanorod hematite were synthesized through electrode position, and both were confirmed as the pure and sole phase of hematite by XRD and Raman. Morphological observations by SEM of electrodes showed that the diameter of nanosphere hematite particles was 20±5 nm, and nanorod hematite particles synthesized in eletrolyte containing ethylene glycol had the length of 90±10 nm and the diameter of about 20 nm. They both exhibited significant absorption in the range of 300~550 nm in the UV-Vis spectroscopy, and the calculated bandgap width for nanosphere and nanorod hematite was 2.00 eV and 1.99 eV, respectively. The calculated carrier density for nanospheres was 3.16×1020 cm-3 and that for nanorods was 1.95×1021 cm-3, fitted through Mott-Schottky curves measured in 1 M KOH solution. The results of photoelectrochemical experiments indicated that the current density of nanorods was lifted up to 5.5 times with illumination compared with that under dark condition under the potential of 0.6V (vs. Ag/AgCl). Nevertheless, the fact that the current density of nanospheres rose by just about 77% indicated that, although both nanosphere and nanorod hematite exhibited photoelectric response, the nanorods performed a more remarkable capacity in photoelectrocatalysis.

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孙曼仪,任桂平,鲁安怀,李艳,丁竑瑞,2017,球粒状和棒状纳米赤铁矿光电化学特性研究[J].岩石矿物学杂志,36(6):817~824. SUN Man-yi, REN Gui-ping, LU An-huai, LI Yan, DING Hong-rui,2017,Photoelectrochemical performance of nanosphere and nanorod hematite[J]. Acta Petrologica et Mineralogica,36(6):817~824.

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History
  • Received:August 22,2017
  • Revised:October 16,2017
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  • Online: November 21,2017
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