Three-Dimensional Decoupling Co-Catalyst from a Photoabsorbing Semiconductor as a New Strategy To Boost Photoelectrochemical Water Splitting
Three-Dimensional Decoupling Co-Catalyst from a Photoabsorbing Semiconductor as a New Strategy To Boost Photoelectrochemical Water Splitting
复制标题
光吸收半导体的三维解耦助催化剂作为促进光电化学水分解的新策略。
DOI：
10.1021/acs.nanolett.8b04278
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发表时间：
2019-01-01
期刊：
影响因子：
10.8
通讯作者：
Yang, Shihe
中科院分区：
文献类型：
--
作者：
Lin, He;Long, Xia;Yang, Shihe
通常将助催化剂沉积在光吸收半导体（PAS）上用于光电化学（PEC）水裂解，但具有负载量有限、光吸收降低和电荷复合倾向的缺点。为了解决这些问题，在这项工作中，提出了一个计划的三维（3D）解耦的助催化剂从PAS与跨孔的十字形导电聚合物主机。为了证明这一概念，开发了一种简便的方法，用于在各种PAS中原位共生长FeO x纳米颗粒和导电聚合物（CP）网络，这些PAS具有不同的微观结构，例如TiO 2纳米棒阵列，WO 3纳米片阵列和平面TiO 2纳米颗粒膜，从而生成定制的光阳极。所合成的光阳极表现出显着增强的PEC水裂解性能，这是清楚地表明，从提高光利用率，增加催化活性位点，增强电荷分离，和光电极的电化学阻抗降低。这种三维解耦策略有望为设计高效的PEC电池开辟一个有前途的方向。
A cocatalyst is normally deposited on a photoabsorbing semiconductor (PAS) for photoelectrochemical (PEC) water splitting, but with drawbacks of limited loading, reduced light absorption, and tendency of charge recombination. To tackle these problems, a scheme of three-dimensional (3D) decoupling cocatalysts from the PAS with a pore-spanning crisscross conducting polymer host is proposed in this work. To demonstrate the concept, a facile method was developed for the in situ cogrowth of FeO x nanoparticles and conducting polymer (CP) network in various PAS with different microstructures such as a TiO2 nanorod array, WO3 nanosheet array, and planar TiO2 nanoparticle film, generating the bespoke photoanodes. The as-synthesized photoanodes exhibited a significantly enhanced PEC water splitting performance, which is clearly shown to arise from the improved light utilization, increased catalytic active sites, enhanced charge separation, and decreased electrochemical impedance of the photoelectrode. This 3D decoupling strategy is expected to open a promising direction for designing efficient PEC cells.