12 3 2006 8 ELECTROCHEM ISTRY Vol. 12 No. 3 Aug. 2006 : 100623471 (2006) 03203332005 NiO 1, 3 1, 1, 1, 1, 2 (1., 150001; 2., 132022) : Y N io. XRD, Y N io,. Y2N io 5 mol L - 1 KOH.,, N io Y 2 O 3 1 0. 1, 363 F g - 1, 2. 02., Y,,. : ; ; ; : O 646; TM 911 : A ( Supercapacitor),, [ 1 ]., [ 2 ]., RuO 2 IrO 2 MnO 2 N io CoO V 2 O 5 SnO 2 [ 327 ].,,,,,,., N io [ 829 ],,, ( ph ) ( ), N io [ 10211 ]., [ 12214 ],.,. 1 1. 1 ( 6000), ( PTFE). 1. 2 0. 5 mol L - 1, 0. 25 mol L - 1, 0. 1 mol L - 1., 0. 4 g ml - 1, 50,, 3 h, 12 h, 80., 300 3 h. 1. 3 XRD D /Max2 A X ( ), K, 0. 154 18 nm, 40 kv, 20 ma, 0. 1 ( ) s 1, 10 85. 1. 4 N io ( PTFE) : 2006201224, : 2006204213 3, Tel: 13059004260, E2mail: chenye@ hrbeu. edu. cn (20050217019)
334 2006 (70 15 l0 5),,,, ( 1 cm 2 ), ( 4 cm 2 ), ( SCE), 5 mol L - 1 KOH, KCl, Im6eX ( ZAHNER Elektrik ). 2 2. 1 X 1 Y N io XRD. Y, ( 37. 3 43. 3 62. 9 ) ( a),, JCPDS(7321523), Y N io,, Y, Y,, Y,,. 1,,,, [ 15 ],. 1 Y N io XRD Fig. 1 XRD patterns of the N io with different yttrium2 doped contents Y/N ic ratio: a) 0, b) 0. 01, c) 0. 05, d) 0. 1, e) 0. 15, f) 0. 2 2. 2 1) 2 Y N io 5 mol L - 1 KOH, 10 mv s - 1., 0. 05 0. 4 V, I E,. 2 N io Fig. 2 Cyclic voltammograns of the Y2doped N io electrode scan rate: 10 mv s - 1 Venkat [ 16 ], : N io + zoh - zn iooh + (1 - z) N io + ze - (1), N io N i 2 + + e - N i 3 +, 2, 0. 30 V 0. 15 V,. Y 0. 21 V, Y. C = I/V,, C E. 3 Y 10% N io C E,,,,,,,. 2) 4 Y,
3 : N io 335 3 Y 10% N io Fig. 3 C E curves of the Y =N00 (10% ) coiposita elec2 trode with different scm rate 4 Y N io Fig. 4 The impedance curves of Y doped N io Yttriom 2doped com tent/% a) 20, b) 1, c) 5, d) 10, e) 15, f) 0, W arburg., Y, Y,.,,, Y,, Y N io,,, [ 17 ]. 3) 5 Y 10% N io.,,. 5mA 20mA 361. 09 F g - 1 266. 67 F g - 1,,,,, [ 18 ]., 5 ma cm - 2, Y 10%, 2. 02, Y,, OH - N io,, [ 19 ]. 3, 5 Y2N io (0. 1 1) ( a) ( b) Fig. 5 Charge ( a) and discharge ( b) curves of the Y2N io (10% ) composite electrode under different working currents
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3 : N io 337 Preparation and Supercapacitor Properties of Y ttrium Doped NiO HAN Dan2dan 1, CHEN Ye 3 1, ZHANG M i2lin 1, SHU Chang 1, ZHANG Chun2xia 1, XU Peng2cheng 2 (1. School of Chem ica l Engineering, Harbin Engineering U n iversity, Harbin 150001, Heilongjiang, China, 2. J ilin Institute of Chem ical Technology, J ilin 132022, J ilin, China) Ab s tra c t: Yttrium doped Nano2N io were synthesized by chem ical p recip itation m ethod. Characterization and perform ance of the samp les were studied by X2ray diffraction, the results showed that the dop ing Yttrium did not change the crystal structure of N io, but the size of crystalline grain was reduced. of the electrode materials were m easured in the three electrode system. The electrochem ical p roperties Electrochem ical p roperties of N io were researched by cyclic voltammetry, constant current charge / discharge and AC impedance m ethods. It could be seen that the chem ical dop ing imp roved the specific capacitance and the utilization of active materials. W hen the weight ratio of N io with Y 2 O 3 was 1 0. 1, the composite material had the best p roperties. The maximum dis2 charge specific capacitance was 363F g - 1 in the 5 mol L - 1 KOH solution. The result of AC impedance showed that the dop ing could imp rove the electrochem ical reversibility, reduce the resistance of cations transfered be2 tween the electrode and electrolyte which made the electrodes show the better capacitive behavior. Ke y wo rd s: Supercapacitor, N ickel oxide, Yttrium, Dop ing