Cobalt hydroxide-black phosphorus nanosheets: A superior electrocatalyst for electrochemical oxygen evolution
| Autor: | Weihong Qi, Yejun Li, Kai Yin, Chundong Wang, Kewei Tang, Haipeng Xie, Ning Zhang, Yongli Gao, Chengan Liao, Jun He |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Cobalt hydroxide General Chemical Engineering Fermi level Oxygen evolution Charge density 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis symbols.namesake Chemical engineering symbols 0210 nano-technology |
| Zdroj: | Electrochimica Acta. 297:40-45 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2018.11.171 |
| Popis: | Black phosphorus (BP), a new rediscovered 2-dimensional material, has gained enormous attention in the field of electrocatalysis, particularly for oxygen evolution reactions. However, its easily being oxidized nature and the bulk crystal structure restricts sufficient active sites, which severely hinders its potential applications in catalysis. Herein, BP nanosheets are prepared and deposited with Co(OH)2 nanosheets to construct the Co(OH)2/BP interfaces. Owing to the high Fermi level of Co(OH)2 than that of BP, the electrons are transferred initiatively from Co(OH)2 to BP, affording remarkable oxygen evolution reaction performance with an overpotential of 276 mV at a current density of 10 mA cm−2. Moreover, the potentiostatic tests present decent electrocatalytic stability of the synthesized Co(OH)2/BP nanosheets. It is further anticipated that engineering the interface towards manipulating the charge density on BP surface and/or interface by depositing other kind of catalysts could be a straightforward strategy to design outstanding hybrid electrocatalysts. |
| Databáze: | OpenAIRE |
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