掺氮石墨烯/富碳氮化碳/掺氮石墨烯量子点多功能光助电催化剂的制备及其性能研究
首发时间:2019-04-15
摘要:C和N元素具有独特的电负性和相似的原子半径,因此由其组成的同素异形体具有良好的光电化学性质。本研究以化学气相沉积法(CVD)生长的掺氮石墨烯(NG)为模板,通过原位水热法在生长富碳氮化碳(CCN)的同时合成了掺氮石墨烯/富碳氮化碳 (NG/CCN)复合材料;再次采用原位水热法,将掺氮石墨烯量子点(N-GQDs)与NG/CCN复合,制备出NG/CCN/N-GQDs复合材料。性能测试结果显示:与NG和CCN相比,NG/CCN/N-GQDs复合材料显示出增强的HER、OER和ORR催化活性。在可见光照射下,这三种催化性能得到进一步的提升。SEM、XRD、FTIR、UV-vis表征证实成功制备出NG/CCN/N-GQDs复合材料,且其具有良好的光生电子-空穴对的有效分离和界面电荷转移能力。本研究结果对探究NG、CCN和N-GQDs的协同作用、拓展其在微电子器件、双光电极燃料电池、可穿戴器件、光电化学电池、传感器等领域应用具有重要价值。
关键词: 掺氮石墨烯 富碳氮化碳 掺氮石墨烯量子点 光助电催化剂 电荷分离与转移
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Synthesis and Performance of N-doped Graphene/Carbon-rich C3N4/ N-doped Graphene Quantum Dots for Photo-Promoted Electrochemical Catalysis
Abstract:Distinctive electronegativity and similar atomic radius for elements of C and N afford their allotropic substances composed of these two elements with excellent photo- and electro- chemical performance for energy conversion. To explore the synergism of allotropic substances, carbon-rich C3N4 (CCN) is in-situ hydrothermally synthesized with the N-doped graphene (NG) grown by chemical vapor deposition (CVD) as the template to prepare the NG/CCN composite. Then, nitrogen-doped graphene quantum dots (N-GQDs), another material containing C and N elements, was combined with NG/CCN via in-situ hydrothermal method to synthesize NG/CCN/N-GQDs. Compared to the NG and CCN, NG/CCN/N-GQDs composite exhibits the remarkable enhancement of catalytic activities toward hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Particularly, visible light irradiation can significantly improve the catalytic performance of NG/CCN/N-GQDs toward the above three reactions. The results concluded from the Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and UV-visible absorption spectroscopy (UV-vis) confirm the successful preparation of NG/CCN/ N-GQDs composites, and it exhibits the improved light-harvesting ability, effective separation of electron-hole pairs, and interfacial charge transfer as compared to the NG, CCN and N-GQDs, beneficial to photo-promoted electrochemical catalysis. In summary, our elucidation on the synergism between NG, CCN, and N-GQDs facilitates to pave their promising applications in microelectronic devices, dual-photoelectric fuel cells, wearable devices, photoelectrochemical batteries, sensors and other fields.
Keywords: N-doped graphene carbon-rich C3N4 N-doped Graphene Quantum Dots photo-electrochemical catalysis separation and transfer of charges
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