Life Cycle Greenhouse Gas Emissions of Long and Pure Carbon Nanotubes Synthesized via On-Substrate and Fluidized-Bed Chemical Vapor Deposition

Heng Yi Teah*, Toshihiro Sato, Katsuya Namiki, Mayu Asaka, Kaisheng Feng, Suguru Noda

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

Improvement in chemical vapor deposition (CVD) methods to efficiently synthesize high-quality carbon nanotubes (CNTs) is critical to realize the full potential of commercial application of CNTs. Meanwhile, methods with less environmental impact from the synthesis process and the use of material and energy are preferable for sustainable chemistry. However, they are rarely quantified in material sciences. Here, we provide a systematic investigation on the life cycle greenhouse gas (GHG) emissions of two emerging CNT synthesis methods: on-substrate and fluidized-bed CVD. Based on years-long experiments, we show the impacts of important configurations that include oxidative additives selection (CO2 or H2O), growth modes in reactors [two-dimensional (2D) flat-plate or three-dimensional (3D) spherical], catalyst deposition methods (sputtering or CVD), and carrier/purging gases (Ar or N2). We find that the life cycle GHG emissions of CNT production ranged from 28.55 (on-substrate) to 0.48 (fluidized-bed) kg CO2e/g CNTs. Considering scaling up to industrial processes, the CNT production can be as low as present carbon fiber (0.02 kg CO2e/g materials). The downstream stages of CNT are unclear as the practical usage is still in development. We therefore outline the impacts and prospects of some selected bulk, ensemble, and individual uses of CNTs in the closing remarks.

本文言語English
ページ(範囲)1730-1740
ページ数11
ジャーナルACS Sustainable Chemistry and Engineering
8
4
DOI
出版ステータスPublished - 2020 2 3

ASJC Scopus subject areas

  • 化学 (全般)
  • 環境化学
  • 化学工学(全般)
  • 再生可能エネルギー、持続可能性、環境

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