燃料化学学报2021，Vol.49Issue(6)：835-843,9.DOI:10.1016/S1872-5813(21)60079-8
焙烧氧化PdCo非预期的乙二醇电催化氧化性能的研究
Oxidative calcination of PdCo with unexpected electrocatalytic performance for ethylene glycol oxidation
摘要
Abstract
Pd-based catalysts have been widely used in alkaline fuel cells. However, up to now, the effects of oxidation treatment of Pd-based catalysts on their application in alkaline fuel cells have been rarely reported. In this paper, PdCo nano-metal catalyst was prepared by calcination-oxidation treatment. It was found that the mass specific activity and area specific activity of the resulting PdO-Co3O4 nano-composite for electrocatalytic oxidation of ethylene glycol in alkaline solution were 3.8 and 2.4 times that of commercial Pt/C, respectively. Compared with PdCo nanometals, the mass specific activity and area specific activity of the PdO-Co3O4 nanocomposite for the electrocatalytic oxidation of ethylene glycol in the alkaline solution increased by 1.6 and 1.2 times, respectively. The experimental and calculated results showed that the surface morphology and active center of the catalyst changed after calcination and oxidation treatment. The adsorption energies of O2 and OH on the Co doped PdO (101) surface decreased, which was beneficial to stabilize the intermediate C2H4OHO*. As a result, the energy barrier for the O?H dissociation on the Co-doped surface was reduced. The strong binding of Co doped PdO (101) with ethylene glycol and its intermediate species led to different electrochemical kinetics and reaction path to produce excellent electric catalytic activity. The synergistic effect of PdO and Co3O4 significantly enhanced the interaction between active oxygen and catalyst surface, which not only facilitates the formation of superoxide species on the catalyst surface, but also improves the redox properties of the catalyst and promotes the electrocatalytic oxidation activity of ethylene glycol. The strategy of bi/multi-metallic oxidation proposed in this paper provides a general methodology for the construction of other catalysts.关键词
PdCo/焙烧氧化/PdO-Co3O4/异质结构界面/乙二醇电催化氧化Key words
PdCo/calcination and oxidation/PdO-Co3O4/heterogeneous interface/electro catalytic oxidation of ethylene glycol分类
化学化工引用本文复制引用
胡天军,赵瑾,贾文玉,王瀛,贾建峰..焙烧氧化PdCo非预期的乙二醇电催化氧化性能的研究[J].燃料化学学报,2021,49(6):835-843,9.基金项目
The project was supported by the Natural Science Foundation of Shanxi Province(201901D111277),the National Natural Science Foundation of China(21571119)and Shanxi Normal University Graduate Science and Technology Innovation Project(2019XSY026).山西省自然科学基金面上资助项目(201901D111277),国家自然科学基金面上资助项目(21571119)和山山西省自然科学基金面上资助项目(201901D111277),国家自然科学基金面上资助项目(21571119)和山西师范大学研究生科技创新项目(2019XSY026) （201901D111277）
