静电纺丝法制备载钯多孔炭纳米纤维及其电化学性能研究

Electrochemical properties of palladium-decorated porous carbon nanofibers synthesized by electrospinning

采用同轴静电纺丝法和后续热处理工艺,制备了具有多孔结构的载钯炭纳米纤维,将其作为质子交换膜燃料电池阴极催化剂,使用SEM、TEM、Raman、XPS等对其微观结构进行了表征,并进一步测试了其电化学性能。结果表明,所制备的载钯多孔炭纳米纤维催化剂具有比商业钯炭更优的电化学活性,电化学表面积达到商业钯炭的1.6倍,质量比活性和面积比活性分别达到商业钯炭的2.75倍和1.7倍,且氧还原过程遵循四电子过程,这主要得益于炭纳米纤维的多孔隙结构和氮掺杂。因此,本文提供了一种简单高效、无需造孔剂制备多孔炭纳米纤维的新方法。

In this paper, Pd/CB-CNF catalysts are prepared via coaxial electrospinning and following heat treatment. The microstructure of the sample is characterized by SEM, TEM, Raman and XPS, and the electrochemical performances are studied. The ECSA of Pd/CB-CNF is improved due to the mesoporous structure of carbon support. The SA@-0.1 V of Pd/CB-CNF is 1.7 times of that of Pd/C, and the MA@-0.1 V of Pd/CB-CNF is 2.75 times of that of Pd/C. The analysis results show that both the porous structure and the self-nitrogen-doping result in excellent electrocatalytic performance by increasing active sites and enhancing the interaction between noble nanoparticles and carbon support. Herein, this work provides a facial and novel method to synthesize porous structured catalysts for ORR without adding pore formers.