Preparation And Characterization Of Collagen Based Nitrogen Doped Porous Carbon Materials

As the fast development of society, science and technology, the requirement of energy increased rapidly day by day. Due to the increasing depletion and serious pollution of traditional fossil fuels, finding a renewable and clean energy is an important way to solve The Energy Lesson. Porous carbon materials, with a high specific surface area and large total pore volume, can effectively absorb carbon dioxide, and it also has contribution to the storage of hydrogen. The supercapacitor has a good performance in many aspects of energy conversion and storage, and it is a hot spot in the current research of electrochemistry. Porous carbon is always used as electrode of the supercapacitor, it has well developed pore structure, and rich surface functional groups which is attribute to the electrical properties. In this paper, we adopt pigskin collagen as raw material because it contains rich protein and amino acid, so this material can be both carbon source and nitrogen source. The activated agent calcium carbonate or calcium oxalate and potassium nitrate will be precipitation with pigskin collagen. It is also use SiO2 microspheres as the template to obtained porous carbon. At last, we studied the effect of carbonization temperature on the electrochemical properties and adsorption properties.(1) Collagen as carbon source and nitrogen source, calcium carbonate and potassium nitrate mixed into collagen by liquid phase precipitation method, porous carbon will be obtained after one-step carbonization under the different temperature. With the increase of carbonization temperature, the specific surface area of the samples is increased (1165m2·g-1-2799 m2·g-1), a large increasing in the mesoporous, decreasing the content of ultramicropoles, the amount of hydrogen adsorption increased, while the one of carbon dioxide is decreased. The nitrogen content of the sample is decreased with the temperature rise (10.4wt%-1.59wt%). In the electrochemical test, the specific capacitance shows the same trend, decreased from 292F·g-1 to 218 F·g-1.(2) We still use collagen as carbon source and nitrogen source, calcium oxalate and potassium nitrate mixed into collagen by liquid phase precipitation method, porous carbon will be obtained after one-step carbonization under the different temperature. Because the calcium oxalate can be decomposed at 400? with the releasing of carbon monoxide, the as-prepared porous carbon has small density. Also with the rise of carbonization temperature, specific surface area increased significantly (1661m2·g-1-2432 m2·g-1) and nitrogen content up to a maximum of 11.4wt%, the amount of carbon dioxide adsorption is 4.7mmol·g-1 under 0?. The highest hydrogen adsorption is 2.29wt% and the best specific capacitance reach to 252F·g-1 with a high rate capability.(3) In this part, we use collagen as raw material, SiO2 microspheres as template, in order to get porous carbon with a special morphology by changing the ratio of silica spheres and pigskin collagen. When the ratio of silica spheres and collagen change into 10:1, the as-prepared carbon samples have cellular morphology. The highest specific surface area of about 119m2·g-1, maximum pore volume is 0.58 cm3·g-1, the marcopores take great part of its pore structure, which leading to the low specific surface area pore volume. The best specific capacitance up to 160 F·g-1 with a good rate capability.