| Global issues such as the energy and environment problems are deepening with the development of society.The increasingly growing demand on energy is difficult to satisfy which is attributed to the excessive consumption of fossil and coal resources.Due to the inherent defect of commercial rechargeable energy storing device,such as low theory capacity,high production cost and adverse impact on the environment,the development of these technologies was greatly hinderd.Hence,developing green and high efficiency energy strorage and conversion device has become a research hotspot for recent years.As an emerging class of porous materials,covalent organic porous polymers also called porous organic polymers(POPs)have exhibited great application potential in numerous research fields.Ultrahigh BET surface area,high carbon content and the diversity of elemental compositions make POPs star materials in the field of energy and environment.It has many special properties,for instance,the flexibility in the monomer deign,the diversity of reaction species and tunability of pore structure.Furthermore,evenly distributed atoms together with the facility in the heteroatoms doping enable POPs available in energy storage and conversion field.Our work aimed to design and prepare special function group(such as2,2,6,6-tetramethyl-1-piperidine N-oxyl and Ferrocene)contained POPs that are applicable in energy field.The as-prepared 2,2,6,6-tetramethyl-1-piperidine N-oxyl(TEMPO)covalent linked POPs prepared from the sonogashira reaction were used as the host materials of lithium-sulphur(Li-S)batteries.The synergistic effect of physical and chemcical focrce could restrin the shuttle effect of polysfide lithium effectively,leading to excellent cycle performance of Li-S batteries.Oxygen reduction reaction(ORR),as one of the most critical reactions for energy conversion,has attracted increasing research interest.We devoted to develop new series of porous carbon using low-cost porous organic polymers insteading the high-cost organic reactions such as the Sonagashira reaction used in the TEMPO-POPs.Via the elaborate design,N and Fe atoms were successfully introduced into the porous polymers.By simple pyrolysis of synthesized polymers,N and Fe codoped porous carbon catalysts were obtained.Then we investigated the electrocatalysis performance of prepared catalysts.N-Fc-800 exhibits prominent ORR catalytic activity in alkaline conditions.In addition,compared with commercial Pt/C,N-Fc-800 exhibits better long term stability and methanol immunity.Furthermore,N-Fc-800 also shows great application potential in rechargeable Zn-air batteries.We developed a facile and efficient strategy to improve the special surface area and physical performce of polymers.Ternary polymerization method was intially applied to introduce different kinds of heteropatoms into the prous skeletons.The vast usage of organic solvents is inevitable for the synthesis of the majority of POPs.Herein,we reported a versatile method for effective utilization of organic solvent.The solvent was utilized simultaneously with the annealing of porous organic polymers(POPs)gels prepared via co-monomoer polymerization strategy.By virtue of this strategy,porous polymers with specific functions and structure could be facilely fabricated.The catalyst obtained from the 4-trifluoromethyl-ferrocene-melamine-POP(abbreviated to TF-POP)with optimized composition and carbonization temperature(TF-C-900)featured hierarchical porous structure and presented prominent catalytic activity toward ORR both in alkaline and neutral conditions.Besides,TF-C-900 also showed superior stability and methanol tolerance in basic conditions.Moreover,we also demonstrated the as-synthesized catalysts hold potential in rechargeable Zn-air batteries. |
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