Preparation Of N-doped Porous Carbon Composite Nanoscale Catalysts And The Performance Of Zinc Air Battery

With the increasing demand for renewable energy,metal-air batteries,especially zinc-air batteries,are considered to be potential alternatives for lithium ion batteries because of their good environment,low cost,safety,rechargeable and excellent durability.The cathode oxygen reduction catalyst of the zinc empty battery has a great influence on its performance.This paper addresses this issue,the main tasks are as follows:(1)Using dicyandiamide,ferrocene and chitosan as raw materials,carbon precursors were obtained by uniform mixing and freeze-drying,and macro-specific surface preparations of N are prepared under the conditions of an NH3 atmosphere annealing at 950? for 60 min.Co-doped carbon material(NFe-C-HSA).The typical product has a three-dimensional network structure and is a N-and Fe-doped composite nanoporous carbon material with high specific surface area and total pore volume(specific surface area of 1776.68 m2g-1,total pore volume of 1.58 cm3g-1).A typical product exhibited excellent cell performance in the assembled zinc-air battery test,with a maximum power density of 170.0 mWcm-2 at a current density of 209.9 mAcm-2,and a.specific product capacity of 100 mAcm-2 at a typical product.697 mAhg-1,compared to commercial Pt/C(20%),produced a typical product with better catalytic performance.(2)The performance of cobalt-graphene-co-doped CMK3 composite nanomaterials(CMK3-G-Co)in zinc-air cells was studied,and the products prepared under several different conditions and commercial Pt/C(20%)in alkali were compared in detail.The battery performance was measured in the medium by the assembled battery.According to the test results,the battery performance of the composite nanomaterial(CMK3-G-Co)tested at 900? is similar to that of the commercial Pt/C(20%).However,the typical products we prepared are rich in raw materials,simple in preparation,and inexpensive,so it is entirely possible.Instead of commercial Pt/C(20%)as a zinc empty battery cathode catalyst.(3)Using biomass Typha as raw material and a small amount of FeCl3 and NiCl2 as the source of doping elements(without adding melamine,ferrocene,etc.)directly synthesized carbon nanotubes doped by a small amount of Fe and Ni(CNT-N-Fe-Ni).The optimal reaction conditions of this material were calcinated at 800? under NH3 atmosphere and a 1 hour insult.The outside diameter of the obtained nanotubes was 145±5nm,and the thickness was 15±2nm.The nitrogen content reached 2.77%,Fe and Ni.The contents of 0.3%and 0.22%,respectively,can further prove that we successfully doped iron and nickel into carbon nanotubes.