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Enhanced electrocatalytic activity of carbon cloth by synergetic effect of plasma and acid treatment

Plasma Science and Technology 2021年第2期23卷 57-63页

作者： Tingting MEI Ming GAO Danni LIU Yu WANG Yifan HUANG Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055People's Republic of China University of Chinese Academy of Sciences Beijing 100049People's Republic of China

Commercial carbon cloth(CC)is an ideal electrocatalysis material to produce oxygen evolution reaction(OER)due to its high conductive and 3D flexible structure,but the lacked active sites limit its *** improving its OER performance,the present study proposed an effective method combining plasma and acid treatment to introduce oxygen-containing functional groups and produce more active sites on its *** to the pristine CC,the plasma and acid treated carbon cloth(PN-CC)delivers a reduced overpotential by 34.6%to achieve current density of 10 mA cm^(−2).The Tafel slope declines from 97.5 mV dec^(–1)(pristine CC)to 55.9 mV dec–1(PN-CC),showing an increased OER ***,PN-CC electrocatalyst shows outstanding stability after 5000 cycles or 25000 *** combination of plasma and acid treatment shows a significant potential in surface modification for electrocatalysts.

关键词： carbon cloth electrocatalytic activity plasma treatment acid oxidation

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Organically-Expanded Graphite/Octadecylamine: Structural, Thermal and Relaxation Evaluation

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Materials Sciences and Applications 2013年第5期4卷 281-286页

作者： Lilian G.Carreira Luis C.Mendes Maria R.G.Ribeiro Pedro J.Sebastião Instituto de Macromoléculas Professora Eloisa Mano(IMA) Universidade Federal do Rio de Janeiro(UFRJ)Rio de JaneiroBrasil Instituto Superior Técnico(IST) Universidade Técnica de Lisboa(UTL)LisboaPortugal

Natural graphite was chemically modified by an acid mixture (H2SO4/HNO3, 4:1) using sonication. The resulting material was then expanded with octadecylamine by the dispersion method. The sample was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG), wide-angle X-ray diffraction (WAXD) and relaxometry—low-field nuclear magnetic resonance (LFNMR). The SEM images revealed the expansion of the graphite layers. The presence of CH absorption was detected in the infrared spectrum of the expanded sample. The WAXD showed an additional diffraction peak at lower 2θ angle, indicating that intercalation of octadecylamine was successful. The thermogravimetry curve revealed three degradation steps. Two of them could be attributed to different structures (delaminated and exfoliated). The relaxometry showed that the relaxation time was dependon the frequency and the curve of the graphite/octadecylamine presented two peaks—approximately before 106 Hz and after 107 Hz. The results permitted inferring that organically modified graphite was achieved.

关键词： Graphite acid oxidation Octadecylamine Sonication

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