Electrochemical studies of mesoporous and copper-modified mesoporous TiO2 -anode material R. Ajay Kumar, A. Venkateswara Rao and Ch. Rajesh Eur. Phys. J. Plus, 133 5 (2018) 179 Published online: 09 May 2018 DOI: 10.1140/epjp/i2018-11992-1