Establishing Efficient Cobalt-Based Catalytic Sites for Oxygen Evolution on a Ta3N5 Photocatalyst
Establishing Efficient Cobalt-Based Catalytic Sites for Oxygen Evolution on a Ta3N5 Photocatalyst
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DOI：
10.1021/acs.chemmater.5b02139
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发表时间：
2015-08
影响因子：
8.6
通讯作者：
Ela Nurlaela;S. Ould-Chikh;I. Llorens;J. Hazemann;K. Takanabe
中科院分区：
文献类型：
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作者：
Ela Nurlaela;S. Ould-Chikh;I. Llorens;J. Hazemann;K. Takanabe
在具有粉末半导体的光催化悬浮体系中，光催化剂半导体和催化剂之间的界面应构造成使受激载流子的电荷转移的阻力最小化。本研究表明，在光催化析氧反应（OER）活性的可见光响应Ta 3 N5修饰CoOx纳米粒子的预处理效果的深入了解。CoOx/Ta 3 N5样品通过浸渍然后在不同温度下在NH3流和空气流下顺序热处理来合成。各种表征技术，包括X射线衍射（XRD），X射线吸收光谱（XAS），扫描透射电子显微镜（STEM），和X射线光电子能谱（XPS），被用来澄清钴的状态和作用。对于浸渍的CoOx/Ta 3 N5，没有观察到光催化活性相对于裸Ta 3 N5的OER的改善，这可能是因为CoOx和Ta 3 N5之间的接触不足。当样品W…
In a photocatalytic suspension system with a powder semiconductor, the interface between the photocatalyst semiconductor and catalyst should be constructed to minimize resistance for charge transfer of excited carriers. This study demonstrates an in-depth understanding of pretreatment effects on the photocatalytic O2 evolution reaction (OER) activity of visible-light-responsive Ta3N5 decorated with CoOx nanoparticles. The CoOx/Ta3N5 sample was synthesized by impregnation followed by sequential heat treatments under NH3 flow and air flow at various temperatures. Various characterization techniques, including X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), scanning transmission electron microscopy (STEM), and X-ray photoelectron spectroscopy (XPS), were used to clarify the state and role of cobalt. No improvement in photocatalytic activity for OER over the bare Ta3N5 was observed for the as-impregnated CoOx/Ta3N5, likely because of insufficient contact between CoOx and Ta3N5. When the sample w...