| Autor: |
Niu, Xiaowei, Wei, Qingbin, Guan, Kunyu, Wang, Xiaoyi, Liu, Heng |
| Předmět: |
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| Zdroj: |
NANO; Jul2021, Vol. 16 Issue 7, pN.PAG-N.PAG, 10p |
| Abstrakt: |
Mechanical alloying is used to prepare the Co 0. 9 Cu 0. 1 Si alloy. Mesoporous silicon SBA-15 is employed as the template to synthesize mesoporous carbon CMK-3. For the purpose of improving the electrochemical properties of Co 0. 9 Cu 0. 1 Si alloy, Co 0. 9 Cu 0. 1 Si + x CMK-3 (x = 3 % , 6%, 9% and 12% mass fraction) alloys are fabricated via ball-milling. As the negative electrodes of Ni–MH batteries, the discharge capacities of alloys are tested by the LAND CT2001A tester and three-electrode system. Finally, the composite alloys show different properties for hydrogen storage. A maximum discharge capacity (558.7 mAh/g) is achieved for Co 0. 9 Cu 0. 1 Si + 6 % CMK-3 electrode. Superfluous CMK-3 is not beneficial to enhance the discharge capacity of Co 0. 9 Cu 0. 1 Si alloy. Moreover, Co 0. 9 Cu 0. 1 Si + x CMK-3 electrodes exhibit better corrosion and oxidation resistance, which leads to higher capacity retention for CMK-3/Co 0. 9 Cu 0. 1 Si composites. The comparative studies on HRD and kinetic properties of Co 0. 9 Cu 0. 1 Si and Co 0. 9 Cu 0. 1 Si + 6 % CMK-3 are also conducted. The R ct of Co 0. 9 Cu 0. 1 Si alloy reduces and I 0 increases after doping of CMK-3. The special structural characteristics and higher conductivity of CMK-3 can offer more electrochemical active sites and accelerate hydrogen diffusion. Accordingly, the electrochemical activity and kinetic properties are enhanced for CMK-3/Co 0. 9 Cu 0. 1 Si composites. Mesoporous silicon SBA-15 was employed as the template to synthesize mesoporous carbon CMK-3. Mechanical alloying was used to prepare the Co0.9Cu0.1Si alloy. Composites of Co0.9Cu0.1Si doped with 3%, 6%, 9% and 12% (mass fraction) of CMK-3 were fabricated by ball-milling. The large specific surface area, high conductivity and distinctive structure characteristics of CMK-3 could provide more electrochemical active sites and accelerate the hydrogen diffusion, thus improving the electrochemical performance of Co0.9Cu0.1Si electrode. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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