Partially sulfurated ultrathin nickel-iron carbonate hydroxides nanosheet boosting the oxygen evolution reaction
| Autor: | Xin Zhang, Huihui Zhao, Xiaoping Dai, Jiaxi Yong, Yang Yang, Jing Zhang, Lei Yu, Hongyan Qiao, Junhui Han, Xuebin Luan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science General Chemical Engineering chemistry.chemical_element 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Bimetal Catalysis chemistry.chemical_compound Nickel chemistry Chemical engineering Electrochemistry Carbonate Hydroxide 0210 nano-technology Nanosheet |
| Zdroj: | Electrochimica Acta. 309:57-64 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2019.04.091 |
| Popis: | Ultrathin nickel-iron carbonate hydroxides nanosheets/sulfides (denoted as NixFeyS/CH) are fabricated by sulfurizing treatment of nickel-iron carbonate hydroxide (NixFeyCH). The partial sulfuration of NiFe carbonate hydroxides by replacing the CO3/OH groups with the S group can well remain the hexagonal morphology, regulate the electronic structure and expose more electrochemical active sites. Benefiting from the ultrathin-layered sheet with mesoporous structure for more available active sites, the strong coupling between metal carbonate hydroxides/sulfides, as well as bimetal synergism for modulation the composition and electronic structure, the optimal NixFeyS/CH exhibits excellent OER catalytic performance, which reaches 20 mA cm−2 at an ultra-small overpotential of 261 mV, lower Tafel slope (103 mV dec−1) and outstanding stability. This work highlights the importance regarding the modulation of composition and electronic structure by the interface coupling and bimetal synergism for boosting OER performance. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect