以水热法合成的FeCo-MOF为前驱体获得FeCo/NC,以硫脲为硫源对FeCo/NC进行硫化处理合成FeCoS/NC.XRD测试结果显示,随着硫脲添加量的增加,来自于FeS和Co9S8衍射峰的强度明显增强,对应于FeCo合金和Fe1-xS的衍射峰逐渐消失,而来自石墨烯的衍射峰则未见明显变化.电化学性能测试结果显示,FeCoS/NC-0.7具有较为优异的HER和OER性能,析氢反应过程中,在电流密度为10 mA cm-2处的过电位为200 mV,Tafel斜率为152.1 mV dec-1;析氧反应过程中,在电流密度为10 mA cm-2处的过电位268 mV,Tafel斜率为55.8 mV dec-1.FeCoS/NC-0.7的电荷转移电阻(Rct)和电化学活性表面积分别为12.6 Ω和399.25 cm-2.
Preparation of FeCoS/N Doped Porous Carbon and Its Electrocatalytic Hydrogen and Oxygen Evolution Performance
FeCo/NC was obtained using FeCo-MOF synthesized by hydrothermal method as a precursor.FeCoS/NC was synthesized by sulfurization treatment of FeCo/NC with thiourea as the sulfur source.The XRD results show that with the increasing amount of thiourea,the intensity of diffraction peaks from FeS and Co9S8 significantly increases,while the diffraction peaks corresponding to FeCo alloy and Fe1-xS gradually disappear,and no significant change is observed in the diffraction peaks from graphene.Electrochemical performance tests reveal that FeCoS/NC-0.7 exhibits excellent HER and OER performance,with an overpotential of 200 mV at a current density of 10 mA cm-2 during the hydrogen evolution reaction,and a Tafel slope of 152.1 mV dec-1;during the oxygen evolution reaction,the overpotential is 268 mV at the same current density,with a Tafel slope of 55.8 mV dec-1.The charge transfer resistance(Rct)and electrochemical active surface area of FeCoS/NC-0.7 are 12.6 Ω and 399.25cm-2 respectively.
万方数据
维普
