Preparation Of Non-noble Metal Carbon-based Electro-catalysts And The Investigation Of Their Properties

Fuel cell is a system that can directly convert the chemical energy into electricity through the oxygen reduction reaction(ORR).It has been considered to be the most promising,high efficient and clean energy due to its advantages such as high energy conversion efficiency and high power density,environmentally friendly as well as the quick startup at low temperature.It is most likely to be applied to business,military and aerospace on a large scale.However,the commercial production of fuel cells has a long way to go because it can be affected by many factors.As one of the most important key materials for fuel cells,the cathodic catalyst commonly used the platinum-based catalyst,which is the best electrochemical catalyst for oxygen reduction reaction.However,due to the high price,high cost and low reserves of the noble metal Pt,it has become an important factor hindering the further development and commercialization of fuel cell technology.Therefore,researching and developing alternative electro-catalysts with high efficiency and low price is the only way to achieve the sustainable development of fuel cells.A large number of studies have shown that the morphology,composition,microstructure and physicochemical properties of carbon materials can be optimized by hetero-doping modification.Thus,electro-catalysts with high electrochemical activity and high stability can be prepared.In addition,the electro-catalysts of the transition metal organic framework with multi-element doped also have excellent electrochemical catalytic activity and high stability.In this paper,triblock copolymers(P123)were used as the main raw materials,and different nitrogen sources(including melamine,urea,ethylenediamine and ammonia)were added.A series of nitrogen-doped ordered mesoporous carbon nanomaterials were prepared by optimizing the doping method.Electrochemical characterization was carried out to confirm the good electrochemical performances of the sample.The influence of carbonation temperature on the electrochemical activity and the metal-supported properties of the carbon carrier were also investigated.The catalyst was characterized by TEM,XRD,XPS and rotating disk electrode measurements.The results show that by exploring the effects of different nitrogen doping methods and carbonation temperatures on the materials,we finally found a low-cost,pollution-free and easy-to-operate synthetic method to prepare the graphene sheet-like mesoporous carbon nanomaterial that possessed a uniform structure and high specific surface area.It had a better electrochemical catalytic activity at 950 ~oC.In addition,we also prepared a transition metal organic framework and investigated the effects of carbonation temperature,doping element types and other factors on the material.Finally,we obtained a carbon-coating,phosphorus-doped,transition metal cobalt-based organic carbon nanomaterial through a simple one-step method.It was characterized with SEM,EDS,XRD and rotating disk electrode measurements.The results show that the material not only had good ORR catalytic performance but also held good catalytic activity of oxygen evolution.It is a promising bifunctional electro-catalyst.