在“双碳”背景下,将超级电容器领域中的研究成果与实验教学相互融合,打造了一个适用于高等院校工科专业大学一年级学生的普通化学实验。从氧化锰电极材料的合成和储能原理出发,引导学生掌握电沉积技术和电化学性能评估方法,鼓励学生进...在“双碳”背景下,将超级电容器领域中的研究成果与实验教学相互融合,打造了一个适用于高等院校工科专业大学一年级学生的普通化学实验。从氧化锰电极材料的合成和储能原理出发,引导学生掌握电沉积技术和电化学性能评估方法,鼓励学生进行交流与讨论。实验的开设有助于学生了解科学研究的基本方法,培养创新意识和团队协作精神,为新时代高校普通化学实验课程的有效开展提供了宝贵经验。Under the background of “Double Carbon” goal, a general chemistry experiment for first-year students majoring in engineering at the university has been developed by integrating research achievements in the field of supercapacitors with experimental teaching. Starting from the synthesis and energy storage mechanism of manganese oxide electrode materials, this experiment guides students to master electrodeposition technology and electrochemical performance evaluation methods. Meanwhile, students are encouraged to engage in communication and discussion during experimental process. The establishment of this experiment not only helps students understand the basic method of scientific research but also fosters their innovative mindset and teamwork spirit, providing valuable experience for the effective delivery of general chemistry experimental courses in college in the new era.展开更多
本文通过简单的电荷吸附制备了高分散的氧化石墨烯含锰化合物(Mn-GO),利用高温驱动下氧化锰的生长以及热运动同时实现了GO的还原、刻蚀和纳米氧化锰的负载,即成功构筑了纳米氧化锰-多孔石墨烯复合材料(MnO-PGNSs).对影响GO分散性的Mn2+...本文通过简单的电荷吸附制备了高分散的氧化石墨烯含锰化合物(Mn-GO),利用高温驱动下氧化锰的生长以及热运动同时实现了GO的还原、刻蚀和纳米氧化锰的负载,即成功构筑了纳米氧化锰-多孔石墨烯复合材料(MnO-PGNSs).对影响GO分散性的Mn2+的添加量、影响GO层数的分散液浓度以及影响MnO热运动的烧结条件进行了详细的考察.研究发现,当Mn-GO同时满足优异的分散性、适合的片层厚度和烧结条件(>800oC,>2h),才能在GNSs表面刻蚀成孔制备得到MnO-PGNSs.本文进一步将MnO-PGNSs作为锂空气电池正极材料,结果表明在50 mA·g-1的电流密度下深度放电后容量达到5100 mA h·g-1,相比于GNSs和PGNSs,MnO-PGNSs具有更高的比容量.锂空气电池性能的提高得益于GNSs表面的多孔结构和MnO优异的催化活性.展开更多
Uniform manganese oxide octahedral molecular sieve（OMS-2） nanorods were synthesized by adding a small quantity of K2S2O8 to the solution containing MnSO4·H2O and KMnO4,and used for complete oxidation of formald...Uniform manganese oxide octahedral molecular sieve（OMS-2） nanorods were synthesized by adding a small quantity of K2S2O8 to the solution containing MnSO4·H2O and KMnO4,and used for complete oxidation of formaldehyde.According to the results of N2 adsorption and X-ray diffraction,the material is a manganese oxide octahedral molecular sieve with the cryptomelane type structure.TEM observation shows that the diameters of the nanorods range from 15 to 25 nm, and the lengths are 300～400 nm.Complete conversion of HCHO to CO2 and H2O can be achieved at 353 K over OMS-2,and the same conversion is obtained at 373 K on the MnOx powder under the same conditions,which demonstrates that the catalytic activity is closely related to the morphology of the catalysts.展开更多
文摘在“双碳”背景下,将超级电容器领域中的研究成果与实验教学相互融合,打造了一个适用于高等院校工科专业大学一年级学生的普通化学实验。从氧化锰电极材料的合成和储能原理出发,引导学生掌握电沉积技术和电化学性能评估方法,鼓励学生进行交流与讨论。实验的开设有助于学生了解科学研究的基本方法,培养创新意识和团队协作精神,为新时代高校普通化学实验课程的有效开展提供了宝贵经验。Under the background of “Double Carbon” goal, a general chemistry experiment for first-year students majoring in engineering at the university has been developed by integrating research achievements in the field of supercapacitors with experimental teaching. Starting from the synthesis and energy storage mechanism of manganese oxide electrode materials, this experiment guides students to master electrodeposition technology and electrochemical performance evaluation methods. Meanwhile, students are encouraged to engage in communication and discussion during experimental process. The establishment of this experiment not only helps students understand the basic method of scientific research but also fosters their innovative mindset and teamwork spirit, providing valuable experience for the effective delivery of general chemistry experimental courses in college in the new era.
文摘本文通过简单的电荷吸附制备了高分散的氧化石墨烯含锰化合物(Mn-GO),利用高温驱动下氧化锰的生长以及热运动同时实现了GO的还原、刻蚀和纳米氧化锰的负载,即成功构筑了纳米氧化锰-多孔石墨烯复合材料(MnO-PGNSs).对影响GO分散性的Mn2+的添加量、影响GO层数的分散液浓度以及影响MnO热运动的烧结条件进行了详细的考察.研究发现,当Mn-GO同时满足优异的分散性、适合的片层厚度和烧结条件(>800oC,>2h),才能在GNSs表面刻蚀成孔制备得到MnO-PGNSs.本文进一步将MnO-PGNSs作为锂空气电池正极材料,结果表明在50 mA·g-1的电流密度下深度放电后容量达到5100 mA h·g-1,相比于GNSs和PGNSs,MnO-PGNSs具有更高的比容量.锂空气电池性能的提高得益于GNSs表面的多孔结构和MnO优异的催化活性.
文摘Uniform manganese oxide octahedral molecular sieve（OMS-2） nanorods were synthesized by adding a small quantity of K2S2O8 to the solution containing MnSO4·H2O and KMnO4,and used for complete oxidation of formaldehyde.According to the results of N2 adsorption and X-ray diffraction,the material is a manganese oxide octahedral molecular sieve with the cryptomelane type structure.TEM observation shows that the diameters of the nanorods range from 15 to 25 nm, and the lengths are 300～400 nm.Complete conversion of HCHO to CO2 and H2O can be achieved at 353 K over OMS-2,and the same conversion is obtained at 373 K on the MnOx powder under the same conditions,which demonstrates that the catalytic activity is closely related to the morphology of the catalysts.
