Dual‐Axial Gradient Doping (Zr and Sn) on Hematite for Promoting Charge Separation in Photoelectrochemical Water Splitting,ChemSusChem

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Dual‐Axial Gradient Doping (Zr and Sn) on Hematite for Promoting Charge Separation in Photoelectrochemical Water Splitting
ChemSusChem ( IF 7.5 ) Pub Date : 2018-09-06 , DOI: 10.1002/cssc.201801614
Dong Chen ₁ , Zhifeng Liu ₁

Affiliation

One of the crucial challenges to enhance the photoelectrochemical water‐splitting performance of hematite (α‐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 mA cm⁻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.

中文翻译：

在赤铁矿上进行双轴向梯度掺杂（Zr和Sn）以促进光电化学水分解中的电荷分离

其中一个关键的挑战，以提高赤铁矿的光电化学水分解性能（的α-Fe ₂ Ø ₃）为解决散装它非常快速充电重组。在这里，我们描述了在一维Fe ₂ O ₃纳米棒阵列上双轴梯度掺杂的设计和制造，其中Zr掺杂用于x轴，Sn掺杂用于y轴，以促进电荷分离。这种双轴梯度掺杂结构满足了更高的电子载流子浓度的要求，以提高电导率以及在Fe ₂ O _3的双轴方向上具有更高的电荷分离效率纳米棒，最终显示出在1.23 V vs. RHE下具有1.64 mA cm ^-2的出色光电流密度，是裸Fe ₂ O _3的26.3倍。此外，当比较均匀的Zr掺杂的Fe ₂ O ₃纳米棒阵列（1.23 V vs. RHE时1.0 mA cm ^-2）和双轴梯度掺杂的（Zr和Sn）Fe ₂ O ₃时，光电流密度显着提高。纳米棒阵列突出显示了Zr和Sn的梯度共掺杂产生的附加电荷分离效应。因此，这种有前途的设计可以为双轴梯度掺杂到光电极中提供指导，以实现有效的PEC水分解。

更新日期：2018-09-06

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