The development of non-noble metal oxidation reduction catalysts(ORR)to improve microbial fuel cell(MFC)performance remains extremely challenging.Herein,the nitrogen-doped iron-based porous carbon nanotube Fe/N@MC-T O...The development of non-noble metal oxidation reduction catalysts(ORR)to improve microbial fuel cell(MFC)performance remains extremely challenging.Herein,the nitrogen-doped iron-based porous carbon nanotube Fe/N@MC-T ORR catalysts were derived from Fe/N-MOF by pyrolyzation using acetonitrile as the nitrogen precursor in a low-cost organic solvent.The Fe/N@MC-T catalysts under different pyrolysis temperatures were characterized by SEM,TEM,BET,XRD,and XPS techniques.Fe/N-MOF showed a smooth rice-like structure with a particle size of about 400×50 nm^(2).The Fe species in Fe/N@MC-T mainly exists in the form of zero-valent iron with a small amount of Fe3C.The results of electrochemical tests revealed that the onset and half-wave potentials of Fe/N@MC-700 were 0.89 V and 0.80 V,respectively,which were only slightly lower than those of the commercial Pt/C(0.92 V and 0.82 V).The MFC with Fe/N@MC-700 showed a highest power density of 864.1 mW/m^(2),which was about 2.25 times that of MFC with carbon cloth,and was slightly lower than that of MFC with Pt/C(20%)(1002.0 mW/m^(2)),which demonstrated that the Fe particles wrapped in carbon nanotubes possessed a relatively high ORR activity.展开更多
山东是中国农业大省,农产品供应安全和价格稳定直接关系山东经济发展和民生冷暖,建立并完善山东省农产品全产业链监测预警机制意义重大。利用B/S结构、 XML数据支持、 Web Service技术、组件化设计方法、跨应用系统信息共享与数据交换...山东是中国农业大省,农产品供应安全和价格稳定直接关系山东经济发展和民生冷暖,建立并完善山东省农产品全产业链监测预警机制意义重大。利用B/S结构、 XML数据支持、 Web Service技术、组件化设计方法、跨应用系统信息共享与数据交换技术等,基于J2EE平台,应用MySql数据库,采用国际流行和通用的三层架构以及面向对象的技术进行设计和实现,研发了山东农产品全产业链监测预警平台,将为农业管理部门和相关从业者及时了解市场行情、有效研判市场走势、合理引导市场预期提供重要的信息支撑。展开更多
文摘The development of non-noble metal oxidation reduction catalysts(ORR)to improve microbial fuel cell(MFC)performance remains extremely challenging.Herein,the nitrogen-doped iron-based porous carbon nanotube Fe/N@MC-T ORR catalysts were derived from Fe/N-MOF by pyrolyzation using acetonitrile as the nitrogen precursor in a low-cost organic solvent.The Fe/N@MC-T catalysts under different pyrolysis temperatures were characterized by SEM,TEM,BET,XRD,and XPS techniques.Fe/N-MOF showed a smooth rice-like structure with a particle size of about 400×50 nm^(2).The Fe species in Fe/N@MC-T mainly exists in the form of zero-valent iron with a small amount of Fe3C.The results of electrochemical tests revealed that the onset and half-wave potentials of Fe/N@MC-700 were 0.89 V and 0.80 V,respectively,which were only slightly lower than those of the commercial Pt/C(0.92 V and 0.82 V).The MFC with Fe/N@MC-700 showed a highest power density of 864.1 mW/m^(2),which was about 2.25 times that of MFC with carbon cloth,and was slightly lower than that of MFC with Pt/C(20%)(1002.0 mW/m^(2)),which demonstrated that the Fe particles wrapped in carbon nanotubes possessed a relatively high ORR activity.
文摘山东是中国农业大省,农产品供应安全和价格稳定直接关系山东经济发展和民生冷暖,建立并完善山东省农产品全产业链监测预警机制意义重大。利用B/S结构、 XML数据支持、 Web Service技术、组件化设计方法、跨应用系统信息共享与数据交换技术等,基于J2EE平台,应用MySql数据库,采用国际流行和通用的三层架构以及面向对象的技术进行设计和实现,研发了山东农产品全产业链监测预警平台,将为农业管理部门和相关从业者及时了解市场行情、有效研判市场走势、合理引导市场预期提供重要的信息支撑。
