Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 43, Issue 10, Pages 5104-5111Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.01.112
Keywords
Hydrogen storage alloys; Surface modification; Polyaniline; Electrochemical properties; Kinetics
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Funding
- National Natural Science Foundation of China [21303157, 51771164, 51571173]
- Scientific Research Projects in Colleges and Universities in Hebei Province [QN2016002]
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In this study polyaniline (PANI) was coated on Nd-Mg-Ni-based alloy surface via an evaporation-polymerization method. SEM-EDX results show that PANI coats on the alloy particle surface, and remains stable during charging/discharging cycles. With assistance of PANI in improving kinetics, high rate dischargeability at 1500 mA/g increases by 12.7% (The treating time is 45 min). Cyclic voltammogram and infrared tests on charged and discharged electrodes shows that transformation between benzene-quinone oxidation species and benzene-benzene reduction species in the charging/discharging electrochemical windows of metal hydride electrodes helps to improve high rate dischargeability by facilitating charge transfer and subsequent hydrogen diffusion. The PANI not only works as an electro-catalytic layer but also as a protective layer to improve cycling stability of Nd-Mg Ni-based alloy electrodes. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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