Wan Jinxin, Liu Zhenyuan, Yang Xiaoyu, Cheng Peng, Yan Chao
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
Nanomaterials (Basel). 2021 Dec 13;11(12):3382. doi: 10.3390/nano11123382.
It is important to develop cost-efficient electrocatalysts used in the oxygen reduction reaction (ORR) for widespread applications in fuel cells. Palladium (Pd) is a promising catalyst, due to its more abundant reserves and lower price than platinum (Pt), and doping an earth-abundant 3-transition metal M into Pd to form Pd-M bimetallic alloys may not only further reduce the use of expensive Pd but also promote the electrocatalytic performance of ORR, owing to the synergistic effect between Pd and M. Here we report a cyanogel-derived synthesis of PdFe alloys with porous nanostructure via a simple coinstantaneous reduction reaction by using KPdCl/KFe(CN) cyanogel as precursor. The synthesized PdFe alloys possess hydrangea-like morphology and porous nanostructure, which are beneficial to the electrochemical performance in ORR. The onset potential of the porous PdFe nanohydrangeas is determined to be 0.988 V, which is much more positive than that of commercial Pt/C catalyst (0.976 V) and Pd black catalyst (0.964 V). Resulting from the unique structural advantages and synergetic effect between bimetals, the synthesized PdFe nanohydrangeas with porous structure have outstanding electrocatalytic activity and stability for ORR, compared with the commercial Pd black and Pt/C.
开发用于氧还原反应（ORR）的具有成本效益的电催化剂对于在燃料电池中的广泛应用很重要。钯（Pd）是一种很有前景的催化剂，因为其储量比铂（Pt）更丰富且价格更低，并且将储量丰富的3d过渡金属M掺杂到Pd中形成Pd-M双金属合金，不仅可以进一步减少昂贵Pd的使用，还由于Pd和M之间的协同效应而促进ORR的电催化性能。在此，我们报告了一种通过使用KPdCl/KFe(CN)氰凝胶作为前体，经由简单的同时还原反应，由氰凝胶衍生合成具有多孔纳米结构的PdFe合金。合成的PdFe合金具有绣球花状形态和多孔纳米结构，这有利于ORR中的电化学性能。多孔PdFe纳米绣球花的起始电位确定为0.988 V，这比商业Pt/C催化剂（0.976 V）和Pd黑催化剂（0.964 V）的起始电位更正。由于独特的结构优势和双金属之间的协同效应，与商业Pd黑和Pt/C相比，合成的具有多孔结构的PdFe纳米绣球花对ORR具有出色的电催化活性和稳定性。
