Electrocatalysis in water electrolysis with solid polymer electrolyte
Electrocatalysis in water electrolysis with solid polymer electrolyte
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DOI：
10.1016/j.electacta.2003.04.001
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发表时间：
2003-11-15
影响因子：
6.6
通讯作者：
Tunold, R
中科院分区：
文献类型：
--
作者：
Rasten, E;Hagen, G;Tunold, R
IrO2 粉末被用作固体聚合物电解质 (SPE) 水电解池的阳极催化剂。该催化剂通过在340℃的硝酸盐熔体中热解工艺制备，然后在440至540℃的不同温度下退火。将催化剂材料应用于电极膜组件（MEA），并使用循环伏安法（CV）、电化学阻抗谱（EIS）和稳态电流密度-电位关系在电解池中进行原位研究。阻抗结果清楚地表明，未退火的材料具有最高的电催化活性，并且该活性随着退火温度的升高而恶化。然而，电导率通过增加退火温度而增加。最佳退火条件为490℃，在实际条件下，总极化在高电流密度范围(1-2Acm(-2))内达到最小值。通过透射电子显微镜（TEM）观察到随着退火温度的增加，颗粒的结晶度和尺寸增加。在阳极侧使用 IrO2、阴极侧使用 Vulcan XC-72 上的 Pt 的水电解池中获得了非常高的电化学性能，对应于 1.60 V 下 1 A cm(-2) 的电流密度。(C) 2003 Elsevier Ireland Ltd。保留所有权利。
Powders of IrO2 were used as anode catalysts in water electrolysis cells with solid polymer electrolyte (SPE). The catalyst was prepared by a pyrolysis process in a nitrate melt at 340 degreesC and then annealed at different temperatures from 440 to 540 degreesC. The catalyst materials were applied to an electrode membrane assembly (MEA) and studied in situ in an electrolysis cell using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and stationary current density-potential relations. The impedance results clearly show that the non-annealed material possesses the highest electrocatalytic activity and that this activity deteriorates with increasing annealing temperature. The electrical conductivity, however, increases by increasing annealing temperature. Optimum annealing conditions were found at 490 C, where the total polarisation reaches a minimum in the high current density range (1-2 A cm(-2)), at the actual conditions. Increased crystallinity and size of the particles with increasing annealing temperature was observed by transmission electron microscopy (TEM). A very high electrochemical performance was obtained in a water electrolysis cell using IrO2 on the anode side and Pt on Vulcan XC-72 on the cathode side, corresponding to a current density of 1 A cm(-2) at 1.60 V. (C) 2003 Elsevier Ireland Ltd. All rights reserved.