期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 42, 页码 38754-38761出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13447
关键词
nanosubstrate; carbon substrate; magnesiophilic; metal anode; Mg battery
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2019M3D1A2103932, NRF-2019R1A2C1084836, NRF-2018R1A4A1025169]
- KIST Institutional Program [2E29641]
- National Research Foundation of Korea [2019M3D1A2103932] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The high volumetric energy density of rechargeable Mg batteries (RMBs) gives them a competitive advantage over current Li ion batteries, which originates from the high volumetric capacity (similar to 3833 mA h cm(-3)) of bivalent Mg metal anodes (MMAs). On the other hand, despite their importance, there are few reports on research strategies to improve the electrochemical performance of MMAs. This paper reports that catalytic carbon nanosubstrates rather than metal-based substrates, such as Mo, Cu, and stainless steel, are essential in MMAs to improve the electrochemical performance of RMBs. In particular, three-dimensional macroporous graphitic carbon nanosubstrates (GC-NSs) with high electrical conductivities can accommodate Mg metal with significantly higher rate capabilities and Coulombic efficiencies than metal substrates, resulting in a more stable and longer-term cycling performance over 1000 cycles. In addition, while metal-based substrates suffered from undesirable Mg peeling-off, homogeneous Mg metal deposition is well-guided in GC-NSs owing to the better affinity of the Mg2+ ion. These results are supported by density functional theory calculations and ex-situ characterization.
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