Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
Department of Chemistry & Biochemistry , University of California , Santa Cruz , California 95064 , United States.
ACS Appl Mater Interfaces. 2018 Apr 18;10(15):12698-12707. doi: 10.1021/acsami.8b01148. Epub 2018 Apr 5.
Ag/BiFeO nanoparticles (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 Mn 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.
Ag/BiFeO 纳米粒子（BFO NPs）是通过两步法合成的，包括甘氨酸燃烧和可见光照射。使用 X 射线衍射、透射电子显微镜、扫描电子显微镜和扫描透射电子显微镜技术详细表征了它们的结构。通过安培生物传感器进行酶促葡萄糖检测研究了它们的电催化性能。沉积在 BFO NPs 选择性晶面上的 Ag 显著提高了它们的电催化活性。为了深入了解增强电催化活性的起源，我们分别在 {200} 和 {001} 晶面上进行了 Ag 还原和 Mn 氧化反应的研究。结果表明，在 BFO NP 表面上实现了有效的电荷分离，这可能是增强电催化性能的原因。此外，在 BFO NPs 上沉积 Ag 后观察到增强的铁磁性，这可能通过自旋相关电荷输运改善电催化性能有关。面特异性的电催化性能对于化学反应具有很高的兴趣和需求。这项研究表明，Ag/BFO NPs 有望在包括生物传感和化学合成在内的电催化应用中具有高产物选择性的应用。
