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大连交通大学Hong Zhao课题组-- 石墨烯调制的静电纺丝法合成三维海绵状纳米纤维Fe-NC催化剂
      这里通过石墨烯调制的静电纺丝方法,构造了三维(3D)海绵状纳米纤维结构Fe-NC催化剂。其中以Fe(NO3)3·9H2O为金属源,PVP为聚合物电解质,DMF为有机溶剂,引入石墨烯来增加前驱物溶液的导电性。所获得的催化剂的框架被重建成碳纳米管,中孔和大孔,并且大多数Fe3C在碳化过程中转化为Fe2N。这里所制备的3D SNS Fe–NC催化剂显示出很好的ORR催化性质(均优于商业Pt / C)和耐甲醇性。如此的高活性揭示了静电纺丝法制备的3D海绵状纳米纤维在能源储存和催化剂制备领域中有着广乏的应用前景。
 
Figure 1. 静电纺丝制备的3D SNS催化剂在加热过程中发生框架重建和催化组分转换的示意图。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
 
Figure 2.(a-b)Fe–NC800在碳化后的SEM图以及横截面SEM图,(c-d)Fe–NC800在更大放大倍数下的SEM图,(e-f)Fe–NC800的TEM图和HRTEM图。
 

Figure 3. (a)N2吸脱附等温曲线,表明了孔径大小情况,(b)XRD图比较,在不同温度煅烧后,有多种不同的物相产生。
 

Figure 4. (a)稳态ORR极化曲线,(b)极限电流密度和(c)Tafel斜率曲线,(d)不同样品(Fe–NC700,Fe–NC800,Fe–NC900,20wt%Pt/C)在不同电压下的电子转移数比较。
 
     该研究工作由大连交通大学Hong Zhao课题组于2020年发表在Chem. Commun.期刊上。原文:3D spongy nanofiber structure Fe–NC catalysts built by a graphene regulated electrospinning method
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