Electrochemical behavior of cubic titanium carbide for lithium-air batteries
Titanium carbide(TiC)nanoparticles were synthesized <i>in situ</i> by direct current(DC)arc-discharge method under the mixture of methane and argon gas atmosphere. The physical characterization including X-ray diffraction(XRD)and transmission electron microscope(TEM)show that TiC nanopar...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2019-02-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/Y2019/V47/I2/34 |
| Summary: | Titanium carbide(TiC)nanoparticles were synthesized <i>in situ</i> by direct current(DC)arc-discharge method under the mixture of methane and argon gas atmosphere. The physical characterization including X-ray diffraction(XRD)and transmission electron microscope(TEM)show that TiC nanoparticles have cubic structure with grain sizes of 40-90nm. Cyclic voltammetry(CV)measurement indicates that TiC nanoparticles are efficient bi-functional catalysts toward both oxygen reduction reaction(ORR)and oxygen evolution reaction (OER)for Li-O<sub>2</sub> batteries, which can effectively compensate for the weak catalytic activity of OER of carbon materials. The results of galvanostatic charge-discharge measurement present that the TiC nanoparticles can reduce the charge-overpotential by 280mV compared to general carbon materials(Super-P), and the TiC electrode delivers an initial discharge capacity of 1267mAh·g<sup>-1</sup> at 50mA·g<sup>-1</sup>. Even at a high current density of 150mA·g<sup>-1</sup>, the discharge capacity still maintains 778mAh·g<sup>-1</sup>, indicating excellent rate performance of lithium-air batteries with TiC nanoparticles as catalysts. The TiC electrode displays 10 cycles at a fixed capacity of 500mAh·g<sup>-1</sup> and at a current density of 100mA·g<sup>-1</sup>.The characterization of XRD, Fourier transform infrared(FT-IR)and scanning electron microscopy(SEM)show that the formation and decomposition of Li<sub>2</sub>O<sub>2</sub> have great reversibility under the bi-functional catalysis of TiC nanoparticles, which can significantly alleviate the accumulation of undesired byproducts, and eventually improve the electrochemical performance of Li-air batteries. |
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| ISSN: | 1001-4381 1001-4381 |