等离子多面体α-Fe2O3纳米晶体光电极中自发空间电荷分离效应的研究,Nano Energy

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等离子多面体α-Fe2O3纳米晶体光电极中自发空间电荷分离效应的研究
Nano Energy ( IF 16.8 ) Pub Date : 2016-11-06 03:04:42
Wei-Hsuan Hung, Chien-Jung Peng, Chin-Ru Yang, Chia-Jui Li, Jing-Jong Shyue, Pai-Chun Chang, Chuan-Ming Tseng, Pi-Chun Juan

高的比表面积和双锥仿立方体多面体的α-Fe _2个ö ₃纳米晶体用于在水分解过程氢还原制造。多面体的α-Fe的两个不同面_2个ö ₃纳米晶体通过合成通用的水热路线。通常，赤铁矿的光催化活性受到其相对较差的吸收性，非常短的激发态寿命和短的空穴扩散长度的限制。为了解决这些问题，一个仿立方体多面体的α-Fe ₂ ö ₃光电极，制作这样实现在水分解过程中自发电荷的空间分离。另外，将来自FTO基板的Sn扩散并掺杂到多面体α-Fe中₂ O ₃在烧结过程中充当电子给体并增加载流子密度。为了进一步利用表面等离子体共振（SPR）性能，增强多面体α-Fe的水分解效率₂ ö ₃光电极，金纳米颗粒的Fe的表面上的装饰₂ ö ₃。由于金纳米粒子中表面电子的集体振动所产生的强场，这种增加的入射光吸收并抑制了电荷复合。随后，该Au /假双相Fe ₂ O ₃光电极显示出9.05μmol/ min的氢气产生速率。

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Exploitation of a spontaneous spatial charge separation effect in plasmonic polyhedral α-Fe2O3 nanocrystal photoelectrodes for hydrogen production

High specific surface area bipyramidal and pseudocubic polyhedral α-Fe₂O₃ nanocrystals were fabricated for hydrogen reduction in a water-splitting process. Two different facets of polyhedral α-Fe₂O₃ nanocrystals were synthesized via a versatile hydrothermal route. Typically, photocatalytic activity of hematite is limited by its relatively poor absorptivity, very short excited-state lifetime, and short hole diffusion length. To address these issues, a pseudocubic polyhedral α-Fe₂O₃ photoelectrode was fabricated that achieved a spontaneous charge spatial separation during the water-splitting process. Additionally, Sn from the FTO substrate was diffused and doped into polyhedral α-Fe₂O₃ during the sintering process to serve as an electron donor and increase the carrier density. To further exploit the surface plasmon resonance (SPR) properties and enhance the water-splitting efficiency of polyhedral α-Fe₂O₃ photoelectrodes, Au nanoparticles were decorated on the surface of Fe₂O₃. This increased incident light absorption and suppressed charge recombination by the strong field generated from collective oscillations of surface electrons in the Au nanoparticles. Subsequently, this Au/pseudocubic Fe₂O₃ photoelectrode demonstrated a 9.05 μmol/min hydrogen production rate.

更新日期：2016-11-06

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