Impermeable Graphene Skin Increases the Heating Efficiency and Stability of an MXene Heating Element
- Authors
- Kang, Dong Jun; Lee, Ki Hyun; Noh, Sung Hyun; Shin, Hwansoo; Jeong, Woojae; Lee, Hyeonhoo; Seo, Yeongbhin; Han, Tae Hee
- Issue Date
- Nov-2023
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- convective heat loss; corrosive resistance; electrothermal materials; graphene skin; hydrophobic coating; low-voltage heating; MXene
- Citation
- SMALL, v.19, no.44, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- SMALL
- Volume
- 19
- Number
- 44
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/193001
- DOI
- 10.1002/smll.202301077
- ISSN
- 1613-6810
- Abstract
- A Joule heater made of emerging 2D nanosheets, i.e., MXene, has the advantage of low-voltage operation with stable heat generation owing to its highly conductive and uniformly layered structure. However, the self-heated MXene sheets easily get oxidized in warm and moist environments, which limits their intrinsic heating efficiencies. Herein, an ultrathin graphene skin is introduced as a surface-regulative coating on MXene to enhance its oxidative stability and Joule heating efficiency. The skin layer is deposited on MXene using a scalable solution-phased layer-by-layer assembly process without deteriorating the excellent electrical conductivity of the MXene. The graphene skin comprises narrow and hydrophobic channels, which results in & AP;70 times higher water impermeability of the hybrid film of graphene and MXene (GMX) than that of the pristine MXene. A complementary electrochemical analysis confirms that the graphene skin facilitates longer-lasting protection than conventional polymer coatings owing to its tortuous pathways. In addition, the sp(2) planar carbon surface with a low heat loss coefficient improves the heating efficiency of the GMX, indicating that this strategy is promising for developing adaptive heating materials with a tractable voltage range and high Joule heating efficiency.
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