CoSe2 nanoparticles were synthesized via a facile hydrothermal method, and characterized by means of X-ray diffraction（XRD）, scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. The syn- ...CoSe2 nanoparticles were synthesized via a facile hydrothermal method, and characterized by means of X-ray diffraction（XRD）, scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. The syn- thesized CoSe2 was composed of crystalline orthorhombic phase and displayed a morphology of short and thin nano- belts. The results of the catalyst experiment demonstrate that the CoSe2 nanocrystals show high catalytic activity and methanol tolerance in oxygen reduction reaction（OR_K） with an open circuit potential（OCP） of 0.80 V（vs. NHE） in 0.5 mol/L HzSO4 at 25 ℃. The transfer process of about 3.7 electrons per oxygen molecule was determined during the reduction process and the transfer coefficient and Tafel slope were 0.50 and 118 mV, respectively, in the potential region of 0.64-0.75 V（vs. NHE）. The high catalytic activity might be related to the high crystallization of the CoSe2 powder and the modification of selenium on the cobalt element.展开更多
基金the Natural Science Foundation of Heilongjiang Province of China（No.B201423）, the Science and Technology Project of Suihua City of China（No.KJZD20130086）, the Scientific Research Fund of Heilongjiang Provincial Education Department, China（No 12541938） and the Doctor Scientific Research Fund of Suihua University, China（No. SD 13001）.
文摘CoSe2 nanoparticles were synthesized via a facile hydrothermal method, and characterized by means of X-ray diffraction（XRD）, scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. The syn- thesized CoSe2 was composed of crystalline orthorhombic phase and displayed a morphology of short and thin nano- belts. The results of the catalyst experiment demonstrate that the CoSe2 nanocrystals show high catalytic activity and methanol tolerance in oxygen reduction reaction（OR_K） with an open circuit potential（OCP） of 0.80 V（vs. NHE） in 0.5 mol/L HzSO4 at 25 ℃. The transfer process of about 3.7 electrons per oxygen molecule was determined during the reduction process and the transfer coefficient and Tafel slope were 0.50 and 118 mV, respectively, in the potential region of 0.64-0.75 V（vs. NHE）. The high catalytic activity might be related to the high crystallization of the CoSe2 powder and the modification of selenium on the cobalt element.
