Geometric Occupancy and Oxidation State Requirements of Cations in Cobalt Oxides for Oxygen Reduction Reaction
文献类型：期刊论文
| 作者 | Liu, J; Bao, HL; Zhang, BS; Hua, QF; Shang, MF; Wang, JQ; Jiang, LH |
| 刊名 | ACS APPLIED MATERIALS & INTERFACES
 |
| 出版日期 | 2019 |
| 卷号 | 11期号:13页码:12525—12534 |
| 关键词 | SIZE-DEPENDENT ACTIVITY BIFUNCTIONAL ELECTROCATALYST CARBON MATRIX NANOPARTICLES PERFORMANCE GRAPHENE CO3O4 MN NANOCRYSTALS EFFICIENT |
| ISSN号 | 1944-8244 |
| DOI | 10.1021/acsami.9b00481 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Cobalt oxides, including spinel Co3O4 and rock-salt CoO, have been widely reported as promising catalysts for oxygen reduction reaction (ORR). However, three types of cobalt ions, i.e., Co2+ in the tetrahedral site (Co-Td(2+)), Co3+ in the octahedral site (Co-Oh(3+)), and Co2+ in the octahedral site (Co-Oh(2+)), are included in these oxides, and the roles of cobalt geometric occupancy and valance states have remained elusive. Here, for the first time, we investigated the effects of cobalt geometric occupancy on the ORR activity by substituting Co-Td(2+) and Co-Oh(3+) of Co3O4 with inactive Zn2+ and Al3+, respectively. The ORR activity decreases in the order of Co3O4 (Co-Oh(3+), Co-Td(2+)) < ZnCo2O4 (Co-Oh(3+)) << CoAl2O4 (Co-Td(2+)) in accordance with the ORR overpotentials at the current density of 0.1 mA cm(Ox)(-2). Furthermore, by comparatively investigating the activity and stability of Co3O4 (Co-Oh(3+)) and CoO (Co-Oh(2+)) nanoparticles, by virtue of the electrochemical technique, the high-resolution transmission electron microscopy, and the in operando fuel cell-X-ray absorption spectroscopy techniques, it was revealed that Co-Oh(2+), in CoO is the main active site, which under electrochemical conditions tends to transform into Co-Oh(3+), and form Co3O4 with a hollow structure due to the Kirkendall effect; nevertheless, it retains decent ORR activity due to the formation of the unique hollow structure. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/31647]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Qingdao Univ Sci & Technol, Coll Mat Sci & Engn, Nanomat & Electrocatalysis Lab, 53 Zhengzhou Rd, Qingdao 266042, Shandong, Peoples R China; 2.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China 3.Chinese Acad Sci, Shanghai Inst Appl Phys, 239 Zhangheng Rd, Shanghai 201204, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Liu, J,Bao, HL,Zhang, BS,et al. Geometric Occupancy and Oxidation State Requirements of Cations in Cobalt Oxides for Oxygen Reduction Reaction[J]. ACS APPLIED MATERIALS & INTERFACES,2019,11(13):12525—12534. |
| APA | Liu, J.,Bao, HL.,Zhang, BS.,Hua, QF.,Shang, MF.,...&Jiang, LH.(2019).Geometric Occupancy and Oxidation State Requirements of Cations in Cobalt Oxides for Oxygen Reduction Reaction.ACS APPLIED MATERIALS & INTERFACES,11(13),12525—12534. |
| MLA | Liu, J,et al."Geometric Occupancy and Oxidation State Requirements of Cations in Cobalt Oxides for Oxygen Reduction Reaction".ACS APPLIED MATERIALS & INTERFACES 11.13(2019):12525—12534. |
入库方式： OAI收割
来源：上海应用物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。