超细铂纳米颗粒复合多孔碳纳米纤维催化剂用于高效氧还原反应  

Constructing ultrafine Pt nanoparticles anchored on N-doped porous carbon nanofibers for efficient and stable oxygen reduction reaction

作　　者：李轩 李国栋 邓晨 景铃胭 冯超 孔艳 蒋兴星 周伟良 柴晓燕 杨恒攀 胡琪 何传新 Xuan Li;Guodong Li;Chen Deng;Lingyan Jing;Chao Feng;Yan Kong;Xingxing Jiang;Weiliang Zhou;Xiaoyan Chai;Hengpan Yang;Qi Hu;Chuanxin He(Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China;College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518071,China)

机构地区：[1]Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China [2]College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518071,China

出　　处：《Science China Materials》2023年第9期3509-3519,共11页中国科学（材料科学（英文版）

基　　金：supported by Shenzhen Science and Technology Program (JCYJ20200109105803806, SGDX20201103095802006, RCYX20200714114535052,JCYJ20190808150001775,and CYJ20190808143007479);the National Natural Science Foundation of China (U21A20312 and 21975162);Guangdong Basic and Applied Basic Research Foundation (2022B1515120084)。

摘　　要：合理设计铂纳米颗粒尺寸是制备高效氧还原电催化剂的关键.本工作中,我们借助静电纺丝和ZIF-8的双重限域作用合成了超细铂纳米颗粒锚定在多孔碳纳米纤维上的催化材料.低Pt负载(4.2 wt%)的Pt@PCNFs在碱性和酸性电解质中均表现出优异的氧还原反应活性,其质量活性分别为41和51 A gPt^(-1),分别是商业Pt/C催化剂相应值的8倍和10倍.在不同温度的碱性和酸性环境的计时安培试验和加速稳定性实验中, Pt@PCNFs的稳定性均优于Pt/C基准.该催化剂的优异性能可归因于小尺寸的Pt纳米颗粒、丰富多孔的纤维结构、Pt纳米颗粒与N掺杂碳纳米纤维之间的强金属载体相互作用以及碳壳层的保护作用.Synthesis of ultrafine Pt nanoparticles with high metal utilization is essential to achieve efficient oxygen reduction reaction(ORR)with a low mass loading of Pt;however,it remains challenging.Here,we propose a facile yet robust strategy to construct ultrafine Pt nanoparticles(~3 nm)anchored on porous carbon nanofibers(PCNFs)via electrospinning.It is found that the porous architecture facilitates mass transport and active sites exposure,thereby providing highly accessible Pt sites.As a result,the synthesized Pt@PCNFs with low Pt loading(4.2 wt%)display excellent ORR activity with a mass activity of 41 and 51 A gPt^(−1) at 0.9 V in alkaline and acidic electrolytes,8 times and 10 times that of the corresponding value for commercial Pt/C catalyst,respectively.More importantly,the strong metal-support interaction between Pt nanoparticles and N-doped carbon nanofibers,as well as carbon shell protection,significantly enhances the stability by suppressing the aggregation of Pt nanoparticles during ORR,and consequently the stability of Pt@PCNFs is much superior to that of the Pt/C benchmark in both alkaline and acid media at different temperatures.This work provides a facile approach to developing efficient and stable low-Pt-based electrocatalysts toward ORR.

关 键 词：铂纳米颗粒 氧还原反应 多孔碳纳米纤维 金属载体相互作用 PT/C催化剂 静电纺丝 纤维结构 催化材料 

分 类 号：O643.36[理学—物理化学] TQ340.64[理学—化学] TM911.4[化学工程—化纤工业]