Construction of hierarchical bundle-like CoNi layered double hydroxides for the efficient oxygen evolution reaction
| Autor: | Ming Song, Xihua Du, Hengxuan Wo, Kun Wang, Lin Tian, Zhao Li, Jing Li, Tongxiang Li |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Oxygen evolution Layered double hydroxides chemistry.chemical_element 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences Oxygen Hydrothermal circulation 0104 chemical sciences Catalysis Chemical engineering chemistry engineering Water splitting 0210 nano-technology |
| Zdroj: | Journal of the Taiwan Institute of Chemical Engineers. 96:273-280 |
| ISSN: | 1876-1070 |
| Popis: | Electrochemical water splitting is a promising approach for the production of H2 fuel while greatly limited by the sluggish anodic oxygen evolution reaction (OER). In this regard, searching for a highly efficient and durable OER catalyst with low cost, abundant active sites, and excellent durability is increasingly demanded. Herein, a facile one-pot hydrothermal method that using urea as pH regulator is demonstrated to engineer nanobundle-like CoNi layered double hydroxides (CoNi LDHs) with high surface areas and rich oxygen vacancies. As a result, by virtue of the nanobundle-like structure, abundant oxygen vacancies, as well as the modified electronic structures, the optimized Co1Ni0.3 LDHs can deliver the current density of 10 mA/cm2 with the overpotentials of only 266 mV, much superior than those of Ir/C, Co(OH)2, and Ni(OH)2 catalysts. More importantly, the resultant Co1Ni0.3 LDHs also possesses excellent stability catalytic activity without negligible activity decay for at least 22 h. Our work not only establishes a potential OER electrocatalyst, but also open up a new avenue for the design and development of highly active electrocatalysts with controlled shapes. |
| Databáze: | OpenAIRE |
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