TY - GEN
T1 - Effects of the pre-freezing time on the structures and electrochemical performances of Co-B alloys
AU - Wu, Chuan
AU - Pang, Chun Hui
AU - Wu, Feng
AU - Bai, Ying
AU - Chen, Chi
AU - Zhong, Yu
PY - 2012
Y1 - 2012
N2 - A series of Co-B alloys with uniform nanoparticles were prepared via a vacuum freeze-drying method, which the precursors of Co-B alloys were prepared by the reduction of bivalent cobalt chloride with aqueous sodium borohydride solution. The alloys were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and brunauer emmett teller (BET) surface area measurement. The electrochemical activities of Co-B samples were examined by charge-discharge test. This work studied the influence of pre-freezing time on the microstructure and electrochemical performance. The sample pre-freezing for 3 hours exhibits the best cycling performance than others, the discharge capacity increase to its maximum 438mAh/g, and it still remained 232 mAh/g after 60 cycles at a current of 50 mAh/g; while those of samples pre-freezing for 1 hour and 5 hours are 399 mAh/g and 413mAh/g, respectively.
AB - A series of Co-B alloys with uniform nanoparticles were prepared via a vacuum freeze-drying method, which the precursors of Co-B alloys were prepared by the reduction of bivalent cobalt chloride with aqueous sodium borohydride solution. The alloys were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and brunauer emmett teller (BET) surface area measurement. The electrochemical activities of Co-B samples were examined by charge-discharge test. This work studied the influence of pre-freezing time on the microstructure and electrochemical performance. The sample pre-freezing for 3 hours exhibits the best cycling performance than others, the discharge capacity increase to its maximum 438mAh/g, and it still remained 232 mAh/g after 60 cycles at a current of 50 mAh/g; while those of samples pre-freezing for 1 hour and 5 hours are 399 mAh/g and 413mAh/g, respectively.
KW - Alkaline secondary battery
KW - Co-B
KW - Dehydrogenation
KW - Electrochemical performance
KW - Hydrogenation
KW - Vacuum freeze-drying
UR - http://www.scopus.com/inward/record.url?scp=84455189250&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.391-392.1085
DO - 10.4028/www.scientific.net/AMR.391-392.1085
M3 - Conference contribution
AN - SCOPUS:84455189250
SN - 9783037853337
T3 - Advanced Materials Research
SP - 1085
EP - 1089
BT - Chemical Engineering and Material Properties
T2 - 2011 International Symposium on Chemical Engineering and Material Properties, ISCEMP 2011
Y2 - 4 November 2011 through 6 November 2011
ER -