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Hierarchical Hollow Co 9 S 8 Microspheres: Solvothermal Synthesis, Magnetic, Electrochemical, and Electrocatalytic Properties

2010; Wiley; Volume: 16; Issue: 39 Linguagem: Inglês

10.1002/chem.200903263

1521-3765

Yuxue Zhou, Hong‐Bin Yao, Yi Wang, Huili Liu, Min‐Rui Gao, Pei Kang Shen, Shu‐Hong Yu,

Quantum Dots Synthesis And Properties

Abstract A simple solvothermal route in a binary solution of triethylenetetramine (TETA) and deionized water (DIW) has been used to synthesize hierarchical hollow Co 9 S 8 microspheres with high surface area (80.38 m 2 g −1 ). An appropriate volume ratio of TETA:DIW has been found to be essential for the formation of hollow Co 9 S 8 microspheres. The magnetic study indicated that the Co 9 S 8 hollow microspheres are paramagnetic at high temperature and antiferromagnetic at low temperature. The oxygen reduction reaction experiments demonstrated that the onset potential of the Co 9 S 8 sample is 0.88 V, which is comparable to the value predicted for Co 9 S 8 (0.74 V) from the theoretical simulation. The discharge capability of Co 9 S 8 hollow microspheres as cathode materials for lithium ion batteries and their electrocatalytic activity for the oxygen reduction reaction (ORR) have been studied.