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氧化石墨烯的电学和光催化性能与其还原程度的关系

Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction.

作者信息

Bakos László Péter, Sárvári Lőrinc, László Krisztina, Mizsei János, Kónya Zoltán, Halasi Gyula, Hernádi Klára, Szabó Anna, Berkesi Dániel, Bakos István, Szilágyi Imre Miklós

机构信息

Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary.

Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, Budafoki út 8. F. I. building, H-1111 Budapest, Hungary.

出版信息

Nanomaterials (Basel). 2020 Nov 22;10(11):2313. doi: 10.3390/nano10112313.

DOI:10.3390/nano10112313
PMID:33266500
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7700189/
Abstract

When graphene oxide is reduced, the functional groups are released and the structure becomes more ordered. The degree of reduction might be tunable with the process parameters. In our work, graphene oxide is prepared and the effect of thermal and chemical reduction is investigated. The samples are characterized with TG/DTA-MS, SEM-EDX, TEM, XPS, ATR-FTIR, Raman spectroscopy and XRD. Their electrical resistance, cyclic voltammetry and photocatalytic activity data are investigated. The conductivity can be varied by several orders of magnitude, offering a tool to match its electrical properties to certain applications. Low temperature reduction in air offers a material with the highest capacitance, which might be used in supercapacitors. The bare graphene oxide has considerably larger photocatalytic activity than P25 TiO. Reduction decreases the activity, meaning that reduced graphene oxide can be used as an electron sink in composite photocatalysts, but does not contribute to the photocatalytic activity by itself.

摘要

当氧化石墨烯被还原时，官能团被释放，结构变得更加有序。还原程度可能可通过工艺参数进行调节。在我们的工作中，制备了氧化石墨烯并研究了热还原和化学还原的效果。通过热重/差示热分析-质谱联用仪（TG/DTA-MS）、扫描电子显微镜-能谱仪（SEM-EDX）、透射电子显微镜（TEM）、X射线光电子能谱仪（XPS）、衰减全反射傅里叶变换红外光谱仪（ATR-FTIR）、拉曼光谱仪和X射线衍射仪（XRD）对样品进行表征。研究了它们的电阻、循环伏安法和光催化活性数据。其电导率可在几个数量级范围内变化，为使其电学性能与特定应用相匹配提供了一种手段。在空气中低温还原可得到具有最高电容的材料，该材料可用于超级电容器。裸露的氧化石墨烯具有比P25二氧化钛大得多的光催化活性。还原会降低活性，这意味着还原氧化石墨烯可用作复合光催化剂中的电子受体，但自身对光催化活性没有贡献。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/353dc3f11466/nanomaterials-10-02313-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/e09024525911/nanomaterials-10-02313-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/566c448c4969/nanomaterials-10-02313-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/41b0ed788df9/nanomaterials-10-02313-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/39c311b3de59/nanomaterials-10-02313-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/6de92875aae9/nanomaterials-10-02313-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/6455d08fb3b5/nanomaterials-10-02313-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/ed337c615fe0/nanomaterials-10-02313-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/6ca0518f9b43/nanomaterials-10-02313-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/55912306dc1f/nanomaterials-10-02313-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/353dc3f11466/nanomaterials-10-02313-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/e09024525911/nanomaterials-10-02313-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/566c448c4969/nanomaterials-10-02313-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/41b0ed788df9/nanomaterials-10-02313-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/39c311b3de59/nanomaterials-10-02313-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/6de92875aae9/nanomaterials-10-02313-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/6455d08fb3b5/nanomaterials-10-02313-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/ed337c615fe0/nanomaterials-10-02313-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/6ca0518f9b43/nanomaterials-10-02313-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/55912306dc1f/nanomaterials-10-02313-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da5d/7700189/353dc3f11466/nanomaterials-10-02313-g010.jpg

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