摘要
采用基于FeI_2/Ni(NO_3)_2溶液的温和化学法还原制备低成本的纸张型石墨烯,并对其导电与催化性能进行了研究。研究结果表明:在pH=1.5,温度为95℃的条件下处理6 h,得到电导率高达30231 S/m的纸张型石墨烯,这是由于作为强路易斯酸的Fe^(2+)促进了亲核取代反应,提高了还原效率,从而提高了纸张型石墨烯的电导率;而Ni^(2+)通过减少溶液中的H^+来抑制Fe^(2+)的水解,从而保证Fe^(2+)对石墨烯的充分还原以及达到保护环境的目的。此外,基于此还原工艺制备的纸张型石墨烯在I^-/I^(3-)电解液中可以获得接近铂电极的电流密度,表明制备出的纸张型石墨烯具有较好的催化性能,并可以为电子提供快速的传出通道,使其在太阳能电池中表现出较好的应用前景。
A novel method to produce reductive graphene oxide （RGO） with FeI2/Ni2＋ applied as reductive agent was reported. This method provides a cheap, effective and environmentally friendly route for the large-scale production of RGO without losing its high conductivity and catalytic activity. An extremely high conductivity of 30231 S/m was obtained affer the optimized FeI2/Ni（NO3）2 solution treatment. The enhancement of bulk conductivity was clue to the promotion of the nucleophilic substitution reaction induced by Fe2＋ （a strong Lewis acid）. Ni2＋ was introduced to optimize the reductive process by reducing the concentration of hydrogen ions, which would inhibit the hydrolysis of Fe2＋. Furthermore, a high cathodic peak current density was observed when applying the free-standing RGO paper as counter electrode in I-/I3- electrolyte system, indicating the high catalytic performance of the RGO paper and providing electron transporting pathway. These outstanding features exhibit a promising prospect of application in solar cells.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第9期997-1003,共7页
Journal of Inorganic Materials
基金
Ministry of Science&Technology of China:Sino-Italy International Cooperation on Innovation(2016YFE0104000)
International Cooperation and Exchanges(NSFC,51561145007)
National Energy Novel Materials Center(NENMC-Ⅱ-1705)
关键词
石墨烯
金属离子
化学还原
电导率
催化
graphene oxide metal iodides chemical reduction bulk conductivity catalytic
