Nanoporous-carbon as a potential host material for reversible Mg ion intercalation [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 648.8 Storage

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. National Nuclear Security Administration ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016

Mô tả vật lý: Size: 6 p. : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 255804

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Here, we study nanoporous-carbon (NPC) grown via pulsed laser deposition (PLD) as an electrically conductive anode host material for Mg
2+
intercalation. NPC has high surface area, and an open, accessible pore structure tunable via mass density that can improve diffusion. We fabricate 2032 coin cells using NPC coated stainless-steel disk anodes, metallic Mg cathodes, and a Grignard-based electrolyte. NPC mass density is controlled during growth, ranging from 0.06?1.3 g/cm
3
. The specific surface area of NPC increases linearly from 1,000 to 1,700 m
2
/g as mass density decreases from 1.3 to 0.26 g/cm
3
, however, the surface area falls off dramatically at lower mass densities, implying a lack of mechanical integrity in such nanostructures. These structural characterizations correlate directly with coin cell electrochemical measurements. In particular, cyclic voltammetry (CV) scans for NPC with density ~0.5 g/cm
3
and BET surface area ~1500 m
2
/g infer the possibility of reversible Mg-ion intercalation. Higher density NPC yields capacitive behavior, most likely resulting from the smaller interplanar spacings between graphene sheet fragments and tighter domain boundaries
lower density NPC results in asymmetrical CV scans, consistent with the likely structural degradation resulting from mass transport through soft, low-density carbon materials.

1. 30 direct energy conversion
2. 75 condensed matter physics, superconductivity and superfluidity

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