Solvothermal synthesis of NiAl double hydroxide microspheres on a nickel foam-graphene as an electrode material for pseudo-capacitors oleh Damilola Momodu, Abdulhakeem Bello, Julien Dangbegnon, Farshad Barzeger, Fatimeh Taghizadeh, Mopeli Fabiane, A. T. Charlie Johnson, Ncholu Manyala