当前位置: X-MOL 学术J. Environ. Chem. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Cobalt phosphide embedded N-doped carbon nanopolyhedral as an efficient cathode electrocatalyst in microbial fuel cells
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2020-10-04 , DOI: 10.1016/j.jece.2020.104582
Weifeng Liu , Zihao Zhou , Zhe Li , Yan Yang , Jiao Zhao , Yimin Zhu , Wenjing Miao

Design and synthesis of effective and low-cost electrocatalysts for oxygen reduction reaction (ORR) is of great significance for the performance of microbial fuel cells (MFCs). Herein, we fabricated a cobalt phosphide embedded N-doped carbon nanopolyhedral (CoP@N-C) by simultaneous phosphidation and carbonization of ZIF-67 under N2 atmosphere. The physical and chemical properties of the electrocatalysts were analyzed in detail by scanning electron microscope, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, photoluminescence spectroscopy, Fourier transform infrared spectroscopy and N2 adsorption–desorption isotherms. Results showed that the CoP@N-C had a dodecahedral shape with cobalt, nitrogen and phosphorus incorporating in porous graphical carbon. CoP compound which had a strong electron capture capability and ORR activity was embedded within the electrocatalysts. Introducing of P increased the contents of pyridinic-N, Co2+/Co3+ couples and oxygen vacancies, which provided sufficient catalytic active sites for ORR. The increased metallic Co content and mesoporous/macroporous surface area ensured efficient electron and mass transfer during ORR. Rotating disk electrode measurement revealed that the CoP@N-C exhibited a high ORR catalytic activity comparable to Pt/C, and an efficient four-electron pathway during ORR. When fabricated into activated carbon air cathode, the optimized CoP@N-C produced a maximum power density of 2236.8 mW m−2 in MFCs, which was about 2 times that of the bare activated carbon control. In addition to the superb ORR performance, the cost of the CoP@N-C was only ∼1/3 of commercial Pt/C. This study suggests that CoP@N-C could be an attractive non-precious metal ORR electrocatalyst for the application in high-performance MFCs.



中文翻译:

磷化钴嵌入的N掺杂碳纳米多面体作为微生物燃料电池中的有效阴极电催化剂

设计和合成用于氧气还原反应(ORR)的有效,低成本的电催化剂,对微生物燃料电池(MFCs)的性能具有重要意义。本文中,我们通过在N 2气氛下同时对ZIF-67进行磷化和碳化来制备了嵌入磷化钴的N掺杂碳纳米多面体(CoP @ NC)。通过扫描电子显微镜,透射电子显微镜,X射线衍射,X射线光电子能谱,光致发光光谱,傅立叶变换红外光谱和N 2来详细分析电催化剂的物理和化学性质。吸附-解吸等温线。结果表明,CoP @ NC具有十二面体形状,并在多孔图形碳中掺入了钴,氮和磷。具有很强的电子捕获能力和ORR活性的CoP化合物被嵌入到电催化剂中。磷的引入增加了吡啶-N,Co 2+ / Co 3+的含量对和氧空位,为ORR提供了足够的催化活性位点。金属Co含量的增加和介孔/大孔表面积确保了ORR期间有效的电子和质量传递。圆盘电极测量表明,CoP @ NC具有与Pt / C相当的高ORR催化活性,并且在ORR过程中具有有效的四电子途径。优化后的CoP @ NC制成活性炭空气阴极后,产生的最大功率密度为2236.8 mW m -2在MFC中,是裸露的活性炭对照的2倍左右。除了出色的ORR性能外,CoP @ NC的成本仅为商用Pt / C的1/3。这项研究表明,CoP @ NC可能是在高性能MFC中应用的有吸引力的非贵金属ORR电催化剂。

更新日期:2020-10-04
down
wechat
bug