The ORR kinetics of ZIF-derived Fe-N-C electrocatalysts
文献类型：期刊论文
| 作者 | Song, Yiling; Zhang, Xiaohua; Cui, Xiangzhi; Shi, Jianlin |
| 刊名 | JOURNAL OF CATALYSIS
 |
| 出版日期 | 2019-04-01 |
| 卷号 | 372页码:174 |
| ISSN号 | 0021-9517 |
| 关键词 | Oxygen reduction reaction Kinetics Zeolitic imidazolate framework Hydrogen peroxide Apparent coverage ratio |
| DOI | 10.1016/j.jcat.2019.02.023 |
| 文献子类 | Article |
| 英文摘要 | Fe-N-C oxygen reduction reaction (ORR) catalysts, based on metal organic frameworks (MOFs) with highly-dispersed active sites embedded in porous carbon matrix, are presently regarded as the most promising noble metal-free ORR catalysts in acidic electrolyte. However, the detailed and specific ORR kinetics of the Fe-N-C catalysts in several successive steps of oxygen reduction, still remains unclear. In this study, a series of zeolitic imidazolate frameworks (ZIF)-derived and Fe-coordinated catalysts (Fe-ZIF-8) were prepared and investigated in much details of half-wave potentials, ring currents, H2O2 yields and apparent coverage ratios on catalyst surfaces, hydrogen peroxide reduction reaction (HPRR) activities and diffusion-limited current plateaus, in comparison to benchmark Pt/C catalyst. Specially, through intentionally introducing varied concentrations of H2O2 as the probe molecule into the acidic electrolyte during ORR tests, we verified an interesting phenomenon that relatively lower ORR catalytic activity of Fe-ZIF-8 is not associated with the over-production of intermediate H2O2 as compared to Pt, and in fact, Fe-ZIF-8 produced significantly lower H2O2 amount than that by Pt in the ORR. Based on the above studies and findings, this work attempts to clarify the possible underlying kinetics in ORR by using Fe-ZIF-8 as the ORR electro-catalysts. It is concluded that, the oxygen-involved kinetics, such as oxygen molecule adsorption, activation and reduction into H2O2 in the first 2e step, rather than the proton-related reactions such as superoxide anion protonation in the first 2e step, nor the HPRR in the second 2e step, is kinetically sluggish on Fe-ZIF-8, in comparison with Pt/C. (C) 2019 Elsevier Inc. All rights reserved. |
| WOS研究方向 | Chemistry ; Engineering |
| 语种 | 英语 |
| 出版者 | ACADEMIC PRESS INC ELSEVIER SCIENCE |
| 源URL | [http://ir.sic.ac.cn/handle/331005/27211]  |
| 专题 | 中国科学院上海硅酸盐研究所 |
| 推荐引用方式 GB/T 7714 | Song, Yiling,Zhang, Xiaohua,Cui, Xiangzhi,et al. The ORR kinetics of ZIF-derived Fe-N-C electrocatalysts[J]. JOURNAL OF CATALYSIS,2019,372:174. |
| APA | Song, Yiling,Zhang, Xiaohua,Cui, Xiangzhi,&Shi, Jianlin.(2019).The ORR kinetics of ZIF-derived Fe-N-C electrocatalysts.JOURNAL OF CATALYSIS,372,174. |
| MLA | Song, Yiling,et al."The ORR kinetics of ZIF-derived Fe-N-C electrocatalysts".JOURNAL OF CATALYSIS 372(2019):174. |
入库方式： OAI收割
来源：上海硅酸盐研究所
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