Clarifying the polyaniline effect on superior electrochemical performances of hydrogen storage alloys
| Autor: | Miao Miao Li, Yi Tong Zhou, Chun Cheng Yang, Chang Chun Wang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydride Graphene General Chemical Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences law.invention Hydrogen storage chemistry.chemical_compound chemistry Chemical engineering Polymerization law Electrode Polyaniline In situ polymerization 0210 nano-technology |
| Zdroj: | Electrochimica Acta. 365:137336 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2020.137336 |
| Popis: | Nanoparticle-shaped polyaniline (PANI) is coated uniformly on the surface of hydrogen storage alloys (HSAs) by in situ polymerization of aniline using an electroless method. PANI has a strong attractive interaction with hydrogen during electrochemical reactions, which has been validated by the density functional theory simulations. Moreover, it is easy to form a nickel-rich layer on HSAs surface with the presence of acid during the fast polymerization process of aniline, which is beneficial for the enhancement of electrochemical reaction kinetics. Both of which contribute to the excellent electrochemical performances of the composite of HSAs/PANI as a negative electrode material in nickel-metal hydride (Ni-MH) battery. Compared with the bare HSAs electrode, the maximum discharge capacity of the HSAs/PANI electrode increases from 302.6 to 330.8 mAh g−1 and the capacity retentions enhances from 13.5 to 30.9% at a discharge current density of 3000 mA g−1. The extended systems of HSAs/Ni-doped PANI and HSAs/graphene/PANI composites also show improved high-rate dischargeability properties. |
| Databáze: | OpenAIRE |
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