Cu2Se-ZnSe heterojunction encapsulated in carbon fibers for high-capacity anodes of sodium-ion batteries
| Autor: | Hongcheng He, Mengqiu Cai, Pengchao Li, Shuangshuang Ding, Yong Cai, Xutao Ning, Qi Gao, Ming Zhang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Carbon nanofiber General Chemical Engineering General Engineering General Physics and Astronomy Nanoparticle Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Energy storage 0104 chemical sciences Anode Chemical engineering Transition metal General Materials Science 0210 nano-technology Current density |
| Zdroj: | Ionics. 26:5525-5533 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-020-03686-3 |
| Popis: | Transition metal chalcogenides have been one of the research hotspots in sodium-ion batteries (SIBs). In this work, Cu2Se-ZnSe heterojunction nanoparticles were embedded in carbon nanofibers to obtain the composites (Cu2Se-ZnSe-CNFs). As anodes for SIBs, Cu2Se-ZnSe-CNFs showed a reversible capacity of 310 mAh g−1 after 100 cycles at 0.1 A g−1. Their rate capacity is 237 mAh g−1 at 2 A g−1. The high specific capacities of Cu2Se-ZnSe-CNFs at a wide range of current density can be attributed to the type-I heterojunction between Cu2Se and ZnSe in composites, which can speed up electron transport. In addition, the protection from CNFs is another factor to ensure the long lifetime of Cu2Se-ZnSe-CNF anodes. The strategy of using heterojunction to promote the electrochemical properties of multi-metal sulfides may be helpful for the application of carbon composites in electrochemical catalysts and other batteries. |
| Databáze: | OpenAIRE |
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