CIESC Journal ›› 2019, Vol. 70 ›› Issue (1): 319-326.DOI: 10.11949/j.issn.0438-1157.20180717

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Controllable preparation of Co-Fe-Pd nanoparticles and their catalytic activities toward oxygen reduction

Channa WANG1(),Ling LIU1,Huihua WANG1,2(),Tianpeng QU1,Jun TIAN1,Deyong WANG1,Zhenhui KANG2   

  1. 1. Shagang School of Iron and Steel, Soochow University, Suzhou 215021, Jiangsu, China
    2. Institute of Functional Nano and Soft Materials FUNSOM, Soochow University, Suzhou 215021, Jiangsu, China
  • Received:2018-07-02 Revised:2018-09-07 Online:2019-01-05 Published:2019-01-05
  • Contact: Huihua WANG

Co-Fe-Pd纳米粒子的可控制备及其氧还原催化性能

王婵娜1(),刘令1,王慧华1,2(),屈天鹏1,田俊1,王德永1,康振辉2   

  1. 1. 苏州大学沙钢钢铁学院, 江苏 苏州 215021
    2. 苏州大学纳米科学技术学院,江苏 苏州 215021
  • 通讯作者: 王慧华
  • 作者简介:王婵娜(1994—),女,硕士研究生,<email>18297112628@163.com</email>|王慧华(1976—),女,博士后,副教授,<email>hhwang@suda.edu.cn</email>
  • 基金资助:
    国家自然科学基金项目(51604179, 51674172, 51774208, 51704200)

Abstract:

Co(FeOH)2, FeCl3 and PdCl2 were used as raw materials, citric acid was used as stabilizer, and ethanol was used as accelerator. Ultrasonic-assisted preparation of Co-Fe-Pd metal nanoparticles was carried out, and the oxygen reduction reaction (ORR) electrocatalytic performance was evaluated. The results show that the average size of Co-Fe-Pd nanoparticles prepared by ultrasonic method is about 3—5 nm, and only Pd diffraction peaks are detected for the Co-Pd,Fe-Pd and Co-Fe-Pd nanoparticles because of the dissolution of Co and Fe into the Pd lattice. Compared to Co, Co-Fe Fe-Pd and Co-Pd nanoparticles, the lattice contraction of Co-Fe-Pd nanoparticles exhibited as the wide peaks is remarkable, which leads to increasing lattice defects and subsequent enhanced catalytic activities. The onset potential of oxygen reduction and the slop of Tafel for the Co-Fe-Pd nanoparticles are 1.03 V(vs RHE) and -87 mV/dec, respectively. The values obtained here are comparable to those of commercial Pt/C catalyst. The transferred electron-number of Co-Fe-Pd nanoparticles is 3.80±0.04 during the oxygen reduction, which is dominated by a four-electron pathway. Furthermore, the peroxide percentage (H2O2) is about 10% from the results of RRDE.

Key words: nanoparticles, catalyst, radiation, electrochemistry, transferred electron-number

摘要:

以Co(COOH)2、FeCl3和PdCl2为原料,柠檬酸为稳定剂,乙醇为加速剂,采用超声辅助制备Co-Fe-Pd金属纳米粒子,并评估其氧还原反应(ORR)电催化性能。研究结果表明,Co-Fe-Pd金属纳米粒子平均粒径约3~5 nm,由于Co、Fe固溶于Pd晶格,使Co-Pd、Fe-Pd和Co-Fe-Pd纳米粒子仅显示Pd衍射峰,且伴有不同程度的宽化;相比于Co-Fe、Fe-Pd或Co-Pd纳米粒子,三元Co-Fe-Pd晶格压缩更为明显,晶格缺陷诱使的活性位点增加,氧还原催化能力增强;其氧还原起峰电位为1.03 V(vs RHE),Tafel斜率为?87 mV/dec,可与商用Pt/C催化剂相媲美;氧还原过程中电子转移数为3.80±0.04,说明其主导四电子转移路径;此外,RRDE结果显示氧还原过程中的中间产物H2O2含量约10%。

关键词: 纳米粒子, 催化剂, 辐射, 电化学, 转移电子数

CLC Number: