期刊
CHEMSUSCHEM
卷 11, 期 19, 页码 3438-3448出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201801614
关键词
charge separation; gradient doping; photoanodes; water splitting; Fe2O3
资金
- Science Funds of Tianjin for Distinguished Young Scholars [17JCJQJC44800]
- Natural Science Foundation of Tianjin [16JCYBJC17900]
One of the crucial challenges to enhance the photoelectrochemical water-splitting performance of hematite (alpha-Fe2O3) is to resolve its very fast charge recombination in bulk. Herein, we describe the design and fabrication of dual-axial gradient-doping on 1D Fe2O3 nanorod arrays with Zr doping for x-axial and Sn doping for y-axial directions to promote the charge separation. This dual-axial gradient-doping structure fulfills the requirements of a greater electron-carrier concentration for increasing conductivity as well as a higher charge-separation efficiency across the dual-axial direction of Fe2O3 nanorods, ultimately showing an excellent photocurrent density of 1.64 mAcm(-2) at 1.23 V vs. RHE, which is 26.3 times more than that of the bare Fe2O3. Furthermore, the remarkably improved photocurrent density, when comparing the uniform Zr-doped Fe2O3 nanorod arrays (1.0 mA cm(-2) at 1.23 V vs. RHE) with dual-axial gradient-doped (Zr and Sn) Fe2O3 nanorod arrays, highlights the additional charge-separation effect resulting from gradient codoping of Zr and Sn. Hence, this promising design may provide guidelines for dual-axial gradient doping into photoelectrodes to realize efficient PEC water splitting.
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