多孔纳米碳纤维与炭黑复合载体负载Pt对氧还原反应活性和耐久性的影响  

Effect of Pt supported on the hybrid of porous carbon nanofibers and carbon black on oxygen reduction reaction activity and durability

作　　者：黄歆榕 李光[1] HUANG Xinrong;LI Guang(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201620

出　　处：《复合材料学报》2025年第3期1459-1467,共9页Acta Materiae Compositae Sinica

摘　　要：进一步提高Pt催化剂对氧还原反应(ORR)的催化活性和稳定性是促进质子交换膜燃料电池(PEMFC)商业化的关键。采用静电纺丝结合高温碳化的方法制备了直径约200 nm的多孔纳米碳纤维(PCNF),将其与炭黑(CB)混合作为Pt催化剂的复合载体,并使用乙二醇还原法制备了催化剂Pt/PCNF-CB,通过与商业Pt/C催化剂的对比,研究了Pt/PCNF-CB对ORR的催化活性与稳定性。当载体中CB含量为40wt%时,PCNF与CB能相互分散均匀,构建独特的三维贯通结构,以此混合载体制备的催化剂Pt/PCNF-CB-40在酸性电解液中表现出优良的ORR电催化活性,与Pt/C相比具有更高的起始电位(0.975 V)与半波电位(0.781 V)。同时,基于Pt/PCNF-CB-40的膜电极(MEA)表现出优良的输出性能,在铂载量较低的条件下其峰值功率密度高达599 mW·cm^(-2),较商业Pt/C催化剂提升19%,并且在加速应力测试(AST)(0.6 V和0.95 V)30000次循环后最大功率密度仅损失21%,而商业Pt/C催化剂损失了41%,证明了PCNF与CB形成的复合载体对提高催化剂活性和稳定性具有积极作用。Further improving the activity and stability of Pt catalysts for oxygen reduction reaction(ORR)is the key to promote the commercialization of proton exchange membrane fuel cells(PEMFCs).In this paper,porous carbon nanofibers(PCNF)with a diameter of about 200 nm were prepared by electrospinning and followed carbonization,which were mixed with carbon black(CB)as a hybrid support for Pt catalysts,and the catalysts Pt/PCNF-CB were prepared by means of ethylene glycol reduction method.The electrocatalytic activity and stability of Pt/PCNF-CB for ORR was investigated by comparing it with commercial Pt/C.When the CB content in the support was 40wt%,PCNF and CB could disperse uniformly to construct a unique three-dimensional through structure,and the Pt/PCNF-CB-40 prepared from this hybrid support shows excellent ORR electrocatalytic activity in acidic electrolyte with higher onset potential(0.975 V)and half-wave potential(0.781 V)compared with commercial Pt/C.Meanwhile,the Pt/PCNF-CB-40-based membrane electrode assembly(MEA)exhibits higher output performance with a peak power density of up to 599 mW·cm^(−2)at low Pt loading,which is a 19%improvement over the commercial Pt/C,and the maximum power density is only lost by 21%after 30 k of accelerated stress test(AST)(0.6 V and 0.95 V),compared with the loss of the commercial Pt/C by 41%,demonstrating that the hybrid support formed by PCNF and CB has a positive effect on improving electrocatalytic activity and stability.

关 键 词：质子交换膜燃料电池 多孔纳米碳纤维 电催化剂 膜电极 氧还原反应 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TB333[一般工业技术—材料科学与工程]