Zhang Chenyue, Chen Zhenyu, Yang Huanzheng, Luo Yuanyan, Qun Tian Zhi, Kang Shen Pei
Collaborative Innovation Center of Sustainable Energy Materials, School of Physical Science and Technology, Guangxi University, Institute of Science and Technology for Carbon Peak & Neutrality, Guangxi Key Laboratory of Electrochemical Energy Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China.
Collaborative Innovation Center of Sustainable Energy Materials, School of Physical Science and Technology, Guangxi University, Institute of Science and Technology for Carbon Peak & Neutrality, Guangxi Key Laboratory of Electrochemical Energy Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China.
J Colloid Interface Sci. 2023 Dec 15;652(Pt B):1597-1608. doi: 10.1016/j.jcis.2023.08.121. Epub 2023 Aug 25.
Platinum-based alloy nanowire catalysts demonstrates great promise as electrocatalysts to facilitate the cathodic oxygen reduction reaction (ORR) of proton exchange membrane fuel cells (PEMFCs). However, it is still challenge to further improve the Pt atom utilization of Pt based nanowires featuring inherent structural stability. Herein, a new structure of PtCo nanowire with nanodendrites was developed using CO-assistance solvent thermal method. The dendrite structure with an average length of about 7 nm are characterized by a Pt-rich surface and the high-index facets of {533}, {331} and {311}, and grows from the ultra-fine wire structure with an average diameter of about 3 nm. PtCo nanowires with nanodendrites developed in this work shows outstanding performance for ORR, in which its mass activity of 1.036 A/mg is 5.76 times, 1.74 times higher than that of commercial Pt/C (0.180 A/mg) and PtCo nanowires without nanodendrites (0.595 A/mg), and its mass activity loss is only 18% under the accelerated durability tests (ADTs) for 5k cycles. The significant improvement is attributed to high exposure of active sites induced by the dendrite structure with Pt-rich surface with the high-index facets and Pt-rich surface. This structure may provide a new idea for developing novel 1D Pt based electrocatalysts.
铂基合金纳米线催化剂作为促进质子交换膜燃料电池（PEMFC）阴极氧还原反应（ORR）的电催化剂展现出巨大潜力。然而，对于具有固有结构稳定性的铂基纳米线，进一步提高铂原子利用率仍是一项挑战。在此，采用CO辅助溶剂热法制备了一种具有纳米枝晶的新型PtCo纳米线结构。平均长度约为7nm的枝晶结构具有富铂表面以及{533}、{331}和{311}等高指数晶面，且从平均直径约为3nm的超细金属丝结构生长而来。本工作中制备的具有纳米枝晶的PtCo纳米线在ORR方面表现出优异性能，其质量活性为1.036A/mg，分别比商业Pt/C（0.180A/mg）和无纳米枝晶的PtCo纳米线（0.595A/mg）高5.76倍和1.74倍，并且在5k次循环的加速耐久性测试（ADT）下其质量活性损失仅为18%。这种显著的性能提升归因于具有富铂表面和高指数晶面的枝晶结构所诱导的活性位点的高度暴露。该结构可能为开发新型一维铂基电催化剂提供新思路。
