NiMo/Cu-nanosheets/Ni-foam composite as a high performance electrocatalyst for hydrogen evolution over a wide pH range
| Autor: | Zhuangzhuang Chang, Deyou Chen, Hongjia Gao, Jian Zhao, Peiwen Chen, Lianjie Zhu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Tafel equation
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element Exchange current density 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst 01 natural sciences Copper 0104 chemical sciences Catalysis Fuel Technology chemistry X-ray photoelectron spectroscopy Chemical engineering Surface layer 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 46:3493-3503 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.11.007 |
| Popis: | We designed and fabricated non-precious and highly efficient electrocatalysts of nickelmolybdenum/copper-nanosheets/nickel-foam composites (NiMo/Cu-NS/NF) by step electrodepositions, combining with chemical oxidation method. The catalysts were charaterized by means of SEM, XRD and XPS spectra. Their electrocatalytic activities were assessed by hydrogen evolution reactions (HER) over a wide pH range, where acidic, neutral and alkaline electrolytes were used, respectively. Benefiting from the unique midlayer Cu nanosheets (NS) architecture and optimum Mo–Ni composition at the surface layer which led to high electronic conductivity and large electrochemically active surface area (ECSA), the NiMo/Cu-NS/NF-2 catalyst displayed superior electrocatalytic activities with low overpotentials of η10 = 43, 86 and 89 mV in 0.5 M H2SO4, 1.0 M PBS and 1.0 M KOH electrolyte, respectively. Especially in the acidic condition, it exhibited the best electrocatalytic activity with smaller Tafel slope of 54 mV dec−1 and higher exchange current density of 1.93 mA cm−2. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect