Spontaneous Delithiation under Operando Condition Triggers Formation of an Amorphous Active Layer in Spinel Cobalt Oxides Electrocatalyst toward Oxygen Evolution
文献类型：期刊论文
| 作者 | Zhang, S; Gu, SQ; Wang, Y; Liang, C; Yu, Y; Han, L; Zheng, S; Zhang, N; Liu, XS; Zhou, J |
| 刊名 | ACS CATALYSIS
 |
| 出版日期 | 2019 |
| 卷号 | 9期号:8页码:7389-7397 |
| 关键词 | X-RAY-ABSORPTION SELF-RECONSTRUCTION ANIONIC REDOX OXIDATION WATER ADSORPTION CATALYSTS SURFACE LICOO2 PHASE |
| ISSN号 | 2155-5435 |
| DOI | 10.1021/acscatal.9b00928 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Understanding the dynamic surface self-reconstruction of transition metal oxides (TMOs) under operando condition is the key for the rational design of oxygen evolution reaction (OER) electrocatalysts. Herein, we aimed toward spinel Li2Co2O4, as a desirable system because of the pure Co3+ ions in the as-prepared sample, to clarify the origin of its enhanced activity during in situ evolution. It was discovered that spontaneous extraction of lithium occurs upon the electrochemical condition to generate an amorphous active layer Li2-xCo2O4-delta(OH)(delta) (Co3+/Co4+), resulting in a progressively increased OER reactivity. Additionally, operando X-ray spectroscopy combined with ex situ techniques unraveled that the appearance of Co4+ and oxidized oxygen ions (oxygen sites with electronic hole) is tightly accompanied by this surface reconstruction. Finally, density functional theory calculations further suggested a possible reconstruction pathway and addressed the importance of oxidized oxygen ions that are triggered by Co4+ ions. These new insights are helpful for understanding why high activity occurs in the system with Co4+ ions and thereby developing efficient OER electrocatalysts. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/32214]  |
| 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.Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Ctr Excellence Superconducting Elect, Shanghai 200050, Peoples R China 2.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China; 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 4.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China; 5.Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Zhang, S,Gu, SQ,Wang, Y,et al. Spontaneous Delithiation under Operando Condition Triggers Formation of an Amorphous Active Layer in Spinel Cobalt Oxides Electrocatalyst toward Oxygen Evolution[J]. ACS CATALYSIS,2019,9(8):7389-7397. |
| APA | Zhang, S.,Gu, SQ.,Wang, Y.,Liang, C.,Yu, Y.,...&Li, J.(2019).Spontaneous Delithiation under Operando Condition Triggers Formation of an Amorphous Active Layer in Spinel Cobalt Oxides Electrocatalyst toward Oxygen Evolution.ACS CATALYSIS,9(8),7389-7397. |
| MLA | Zhang, S,et al."Spontaneous Delithiation under Operando Condition Triggers Formation of an Amorphous Active Layer in Spinel Cobalt Oxides Electrocatalyst toward Oxygen Evolution".ACS CATALYSIS 9.8(2019):7389-7397. |
入库方式： OAI收割
来源：上海应用物理研究所
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