Effect of reduced graphene oxide-supported copper addition on electrochemical properties of La0.7Mg0.3Ni2.8Co0.5 electrodes |
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Authors: | Xiantun Huang Zhiqiang Lan Jiacheng Li Hao Zhang Jin Guo |
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Affiliation: | 1. Department of Materials Science and Engineering, Baise College, Baise 533000, China;2. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, College of Physics Science and Technology, Guangxi University, Nanning 530004, China |
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Abstract: | The reduced graphene oxide-supported copper (email protected]) nanocomposite was introduced to improve the electrochemical properties of La0.7Mg0.3Ni2.8Co0.5 alloy electrodes. Experimental results show that adding email protected] nanocomposite with mass fractions of x wt% (x = 0, 3, 6 and 9) to the alloy electrodes provides electrodes with maximum discharge capacities of 368.9 mAh/g (x = 0), 373.2 mAh/g (x = 3), 407.3 mAh/g (x = 6) and 398.6 mAh/g (x = 9), and high-rate dischargeabilities at a discharge current density of 1200 mA/g of 40.5% (x = 0), 64.0% (x = 3), 82.0% (x = 6) and 76.0% (x = 9). The addition of email protected] nanocomposite also provides alloy electrodes with hydrogen diffusion coefficients of 3.7 × 10?10 cm2/s (x = 0), 4.1 × 10?10 cm2/s (x = 3), 4.2 × 10?10 cm2/s (x = 6) and 4.0 × 10?10 cm2/s (x = 9). Clearly, the addition of 6 wt%email protected] nanocomposite not only increases the electrochemical capacity of La0.7Mg0.3Ni2.8Co0.5 alloy electrodes, but also improves their electrochemical kinetic properties. |
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Keywords: | Corresponding author Kinetic properties Alloy electrode Electrochemical properties Graphene Rare earths |
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