期刊
ACS APPLIED ENERGY MATERIALS
卷 1, 期 5, 页码 1846-1852出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b00258
关键词
carbon nanotemplate; macroporous carbon; sulfur doping; metal anode; sodium ion battery
资金
- Industrial Strategic Technology Development Program [10050477]
- Ministry of Trade, Industry & Energy (MI, Korea)
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1A2B4009601, NRF-2017R1C1B1004167]
Sodium metal is a good candidate as an anode for a large-scale energy storage device because of the abundance of sodium resources and its high theoretical capacity (similar to 1166 mA h g(-1)) in a low redox potential (-2.71 V versus the standard hydrogen electrode). In this study, we report effects of sulfur doping on highly efficient macroporous catalytic carbon nanotemplates (MC-CNTs) for a metal anode. MC-CNTs resulted in reversible and stable sodium metal deposition/stripping cycling over similar to 200 cycles, with average Coulombic efficiency (CE) of similar to 99.7%. After heat treatment with elemental sulfur, the sulfur-doped MC-CNTs (S-MC-CNTs) showed significantly improved cycling performances over 2400 cycles, with average CEs of similar to 99.8%. In addition, very small nucleation overpotentials from similar to 6 to similar to 14 mV were achieved at current densities from 0.5 to 8 mA cm(-2), indicating highly efficient catalytic effects for sodium metal nucleation and high rate performances of S-MC-CNTs. These results provide insight regarding a simple but feasible strategy based on bioabundant precursors and an easy process to design a high-performance metal anode.
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