Performance of a PEM water electrolyser using a TaC-supported iridium oxide electrocatalyst
Performance of a PEM water electrolyser using a TaC-supported iridium oxide electrocatalyst
复制标题
使用 TaC 负载氧化铱电催化剂的 PEM 水电解槽的性能
DOI：
10.1016/j.ijhydene.2013.12.085
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发表时间：
2014
影响因子：
7.2
通讯作者：
K. Bouzek
中科院分区：
文献类型：
--
作者：
J. Polonský;P. Mazúr;M. Paidar;E. Christensen;K. Bouzek
聚合物电解质膜(PEM)水电解是一种很有吸引力的无碳氢气制备方法。这种方法的缺点之一是需要贵金属基电催化剂。这就要求贵金属的高效利用，贵金属化合物分散在催化剂载体上即可获得。在实验室的PEM电解水器上测试了TAC载体上IrO2含量为50%、70%和90%的电催化剂，并与纯IrO2进行了比较。温度分别设置为90℃、110℃、120℃和130℃，电池电压在1.4~1.8℃之间变化，获得了一系列电催化剂的负载特性和电化学阻抗谱，并进行了比较。发现70%IrO2电催化剂的电流密度最高，电荷转移和电池电阻最小。相比之下，纯IrO2电催化剂表现出最低的电流密度和最高的电荷转移和电池电阻。例如，在130℃和1.7℃时，70wt.%IrO2与纯IrO2电催化剂的相对电流密度差达到36%。所有负载型电催化剂对贵金属的利用效率都高于纯IrO2。
Polymer electrolyte membrane (PEM) water electrolysis is an attractive way of producing carbon-free hydrogen. One of the drawbacks of this method is the need for precious metal-based electrocatalysts. This calls for a highly efficient utilization of the precious metal, which can be obtained by dispersing the precious metal compound onto a catalyst support. Electrocatalysts with 50, 70 and 90 wt.% of IrO2on a TaC support were tested in a laboratory PEM water electrolyser and compared with pure IrO2. The temperature was set at 90, 110, 120 and 130 °C respectively and the cell voltage was varied between 1.4 and 1.8 V. The load characteristics and electrochemical impedance spectra were obtained and compared for a range of electrocatalysts. The highest current densities and the lowest charge transfer and cell resistances were found for the 70 wt.% IrO2electrocatalyst. By contrast, the pure IrO2electrocatalyst showed the lowest current densities and the highest charge transfer and cell resistance. For example, the relative difference in current densities between the 70 wt.% IrO2and the pure IrO2electrocatalyst attained 36% at 130 °C and 1.7 V. All of the supported electrocatalysts showed a higher efficiency of utilization of the precious metal than the pure IrO2.