Experimental confirmation that reduced graphene oxide bismuth nanocomposite reach theoretical capacity value WangJ SillerL HassanK HuntM CharlesA BrectanuO TangJ WalkerD SunY 2016 Data include FTIR, SEM, XRD, XPS, CV, TEM, Nyquist plot, specific capacity, DTA, TGA, nitrogen adsorption - desorption isotherms