Two-Dimentional Porous Carbons And Carbon-Based Composite Materials:Preparation And Application Research

With the increasing requirement of energy and the sluggish petroleum supply,Identifying and building a sustainable energy system are perhaps two of the most critical issues that today's society must address.Replacing our current energy carrier mix with a sustainable fuel is one of the key pieces in that system.Hydrogen as an energy carrier,primarily derived from water,can address issues of sustainability,environmental emissions,and energy security.Hydrogen fuel cells may provide electric power for the aircraft electrical generating system and drive vehicles,so the research and development of electrochemical catalysts for oxygen reduction reaction and hydrogen evolution reaction will promote the aeronautics industry undoubtedly.This research subjects as follow aim at developing two-dimensional?2D?porous carbons and carbon-based composites.1.Nitrogen-doped nanostructured carbon materials represent important candidates as metal-free electrocatalysts for ORR because of their unique electronic properties and structural features.Firstly,we developed a new 2D graphene-based Schiff base porous polymer?TPP?by the condensation of melamin,1,4-phthalaldehyde and aminated graphene oxide.The as-prepared 2D nitrogen-doped porous carbons,gotten through the direct pyrolysis of the sandwich-like two-dimentional porous polymer,shows high microporosity and efficient ORR electrocatalytic activity in 0.1M KOH.And among all of them,the TPC-800 shows the best performance.2.Recent studies have proven that the carbon materials doped with heteroatom may show pronounced catalytic activity.we have developed a simple approach?one pot polymerization without any template and then pyrolysis?towards N/S co-doped microporous carbon nanosheets,with large surface area(up to 953.2 m² g^-1),showing excellent ORR catalytic performance with mainly 4e^-transfer pathway in alkaline condition.The synthetic strategy described in this work provides a new and easy access to2D heteroatom doped microporous carbon nanosheets with excellent electrochemical performance.3.We prepared a new family of two-dimensional?2D?molybdenum phosphide-containing porous carbons?TPC-MoPs?by using the as-prepared TPP as 2D template,and low-cost diammonium phosphate and ammonium molybdate as precursors through stepwise self-assembly and pyrolysis performances.The resulting TPC-MoPs feature layered and porous structures with the high specific surface areas up to 72 m² g^-1.The unique mophorlogy characters render such kinds of materials with the inceased active catalytic sites and better conductivity as compared with the other MoPs-based composites.As a consequence,the as-prepared composites exhibit superior electrocatalytic performance in the hydrogen evolution reaction?HER?under acidic conditions.