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学科主题: 物理化学
题名: Carbon supported PdO with improved activity and stability for oxygen reduction reaction in alkaline solution
作者: Wu, Qiumei1;  Rao, Zhaoxia1;  Yuan, Lizhi3;  Jiang, Luhua3;  Sun, Gongquan3;  Ruan, Jianming1;  Zhou, Zhongcheng1;  Sang, Shangbin2
通讯作者: ShangbinSang
关键词: Oxygen reduction reaction ;  electrocatalysis ;  palladium oxide ;  manganese oxides
刊名: ELECTROCHIMICA ACTA
发表日期: 2014-12-20
DOI: 10.1016/j.electacta.2014.10.147
卷: 150, 期:1, 页:157-166
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: A series of PdO/C catalysts were prepared by using the PdCl2 and Mn3O4/C as the precursors. The physical properties and the catalytic activity toward the oxygen reduction reaction (ORR) in alkaline media of the prepared PdO/C catalysts were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), as well as transmission electron microscopy (TEM) and the electrochemical techniques. The results show that, with the reaction time increasing, the main species PdO forms on the surface of carbon accompanied by a decreasing of the Mn content, implying a replacement of Mn3O4 with PdO on the carbon surface. The morphology of the irregular aggregates composed of PdO nanoparticles (about 2.3 nm) is similar to that of Mn3O4 particles. The PdO/C catalyst with the reaction time of 4 h and the Mn content of 0.03 wt.% (PdO/C-4 h) exhibits the highest activity toward the ORR, with the onset potential and the half-wave potential of the ORR shifting positively about 0.017 V and 0.020 V, respectively, compared to those on the commercial Pd/C (20 wt. %, E-TEK). The specific and mass current densities for he ORR obtained at 0.850 V (vs. RHE) on the PdO/C-4 h catalyst are about 2.64 mAcm(Pd) (2) and 1.11 mA mu g(Pd) (1), respectively, being about 2.67 and 2.18 times to those on the Pd/C. After 2000 potential cycles between 0.424 V and 1.124 V for accelerated aging tests, the better catalytic stability of the PdO/C-4 h catalyst toward the ORR over the Pd/C is observed, with the half-wave potential of the ORR shifting negatively only about 0.013 V, less than that on the latter one. All these findings demonstrate that the catalytic activity and stability of PdO/C-4 h catalyst for the ORR are superior to those of the commercial Pd/C, and the PdO/C-4 h catalyst would be a promising candidate for the non-platinum catalysts in alkaline media. (C) 2014 Elsevier Ltd. All rights reserved.
关键词[WOS]: NITROGEN-DOPED GRAPHENE ;  ELECTROCHEMICAL REDUCTION ;  ELECTROCATALYTIC ACTIVITY ;  FUEL-CELLS ;  ENHANCED PERFORMANCE ;  CATHODE CATALYSTS ;  SURFACE-AREA ;  NANOPARTICLES ;  PALLADIUM ;  OXIDE
语种: 英语
WOS记录号: WOS:000346185000021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/144109
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
2.Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China

Recommended Citation:
Wu, Qiumei,Rao, Zhaoxia,Yuan, Lizhi,et al. Carbon supported PdO with improved activity and stability for oxygen reduction reaction in alkaline solution[J]. ELECTROCHIMICA ACTA,2014,150(1):157-166.
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