P.O. Box 447, Arusha, Tanzania. 2 Ifakara Health Institute, P.O. Box 78373, Dar es Salaam, Tanzania. 3 Dar es Salaam Institute of Technology, P. O. Box 2958, Dar es Salaam, Tanzania. 4 National Institute for Medical Research, Amani Medical Research Centre, P.O. Box 81, Muheza, Tanga, Tanzania. 5 Genome Science Centre and Department of Veterinary Microbiology and Parasitology, Sokoine University...

The electrochemical behaviour of Co3O4 with sodium is reported here. Upon cycling in the voltage window of 0.01-3.0 V, Co3O4 undergoes a conversion reaction and exhibits a reversible capacity of 447 mA h g(-1) after 50 cycles. Therefore, nanostructured Co3O4 presents feasible electrochemical sodium storage, offering possibilities to develop new anode materials for sodium-ion batteries.

Mingrui Lao 1,2 and Jun Tang 1,3,* 1 Science and Technology on Information Systems Engineering Laboratory, National University of Defense Technology, Changsha 410073, China; [email protected] 2 The School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China 3 Department of Telecommunication and System Engineering, Universitat Autònoma de Barcelona, Sabadel...