Enhanced and Facet-specific Electrocatalytic Properties of Ag/Bi2Fe4O9 Composite Nanoparticles
Enhanced and Facet-specific Electrocatalytic Properties of Ag/Bi2Fe4O9 Composite Nanoparticles
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Ag/Bi2Fe4O9 复合纳米粒子的增强和刻面特异性电催化性能
DOI：
10.1021/acsami.8b01148
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发表时间：
2018
影响因子：
9.5
通讯作者：
Jiang Yong
中科院分区：
文献类型：
--
作者：
Wang Kai;Xu Xiaoguang;Lu Liying;Wang Haicheng;Li Yan;Wu Yong;Miao Jun;Zhang Jin Zhong;Jiang Yong
采用甘氨酸燃烧和可见光照射两步法合成了Ag/Bi 2Fe 4 O 9纳米粒子（BFO NPs）。它们的结构进行了表征，详细使用X射线衍射，透射电子显微镜，扫描电子显微镜，扫描透射电子显微镜技术。用安培型生物传感器检测葡萄糖酶，研究了它们的电催化性能。银沉积在BFO纳米颗粒的选择性晶面上显著增强了它们的电催化活性。为了深入了解增强的电催化活性的起源，我们分别在{200}和{001}晶面进行了Ag+还原和Mn 2+氧化反应的研究。结果表明BFO NP表面上有效的电荷分离，这可能是增强的电催化性能的原因。此外，增强的铁磁性后，观察到银沉积在BFO纳米粒子，这可能是通过自旋依赖的电荷传输改善的电催化性能。小面特定的电催化性能是非常有趣的和所需的化学反应。这项研究表明，银/BFO纳米粒子是潜在的有用的电催化应用，包括生物传感和化学合成具有高的产品选择性。
Ag/Bi2Fe4O9nanoparticles (BFO NPs) have been synthesized using a two-step approach involving glycine combustion and visible light irradiation. Their structures were characterized in detail using X-ray diffraction, transmission electron microscope, scanning electron microscopy, and scanning transmission electron microscopy techniques. Their electrocatalytic properties were studied through enzymatic glucose detection with an amperometric biosensor. The Ag deposited on selective crystal facets of BFO NPs significantly enhanced their electrocatalytic activity. To gain insights into the origin of the enhanced electrocatalytic activities, we have carried out studies of Ag+reduction and Mn2+oxidation reaction at the {200} and {001} facets, respectively. The results suggest effective charge separation on the BFO NP surfaces, which is likely responsible for the enhanced electrocatalytic properties. Furthermore, enhanced ferromagnetism was observed after the Ag deposition on BFO NPs, which may be related to the improved electrocatalytic properties through spin-dependent charge transport. The facet-specific electrocatalytic properties are highly interesting and desired for chemical reactions. This study demonstrates that Ag/BFO NPs are potentially useful for electrocatalytic applications including biosensing and chemical synthesis with high product selectivity.