Title of article :
Microstructures and electrochemical hydrogen storage performances of La0.75Ce0.25Ni3.80Mn0.90Cu0.30(V0.81Fe0.19)x (x = 0–0.20) alloys
Author/Authors :
Fan، نويسنده , , Yanping and Peng، نويسنده , , Xianyun and Liu، نويسنده , , Baozhong and Zhang، نويسنده , , Baoqing and Peng، نويسنده , , Qiuming and Ji، نويسنده , , Liqiang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
8
From page :
7042
To page :
7049
Abstract :
Electrochemical hydrogen storage performances of a La0.75Ce0.25Ni3.80Mn0.90Cu0.30 alloy are improved by adding V0.81Fe0.19 combined with hyper-stoichiometry, and microstructures and electrochemical characteristics of La0.75Ce0.25Ni3.80Mn0.90Cu0.30(V0.81Fe0.19)x (x = 0–0.20) hydrogen storage alloys are investigated. X-ray diffraction and backscattered electron results indicate that all alloys are a LaNi5 phase with a hexagonal CaCu5-type structure and the lattice parameters a, c and cell volume V of the LaNi5 phase decrease with increasing x value. The alloy electrodes keep excellent activation performance with increasing V0.81Fe0.19 content. Maximum discharge capacity of alloy electrodes first increases from 330.2 (x = 0) to 335.4 (x = 0.10) mAh/g, and then decreases to 328.8 mAh/g (x = 0.20) with further increasing x value. The high-rate dischargeability at the discharge current density of 1200 mA/g first increases from 67.2% (x = 0) to 76.7% (x = 0.10), and then decreases to 65.3% (x = 0.20). The cycling capacity retention rate at the 100th cycle increases from 52.3% (x = 0) to 77.9% (x = 0.20), which is mainly ascribed to the improvement of anti-pulverization.
Keywords :
Hydrogen storage alloys , X-ray diffraction , Nickel/metal hydride battery , Kinetics , Electrochemical properties
Journal title :
International Journal of Hydrogen Energy
Serial Year :
2014
Journal title :
International Journal of Hydrogen Energy
Record number :
1868196
Link To Document :
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