The research and development of hydrogen oxidation reaction catalysts in alkaline media is a prerequisite for the commercialization of alkaline polymer electrolyte fuel cell. PtRu bimetallic catalyst was found to be more active towards HOR than Pt in alkaline, but the composition-activity relationship of PtRu alloys is still lacking. Herein, a series of PtRu alloy planar electrodes with 14 different compositions were prepared in a high-throughput fashion using an improved magnetron sputtering method. The atomic ratio of Pt was controlled from 6.7% to 99.7% within the samples. The corresponding electro-catalytic activities towards the HOR in alkaline were systematically measured by rotating disc electrode method. A volcano-shape relationship between the HOR exchange current density and the Ru atomic fraction was revealed, and maximum activity was observed at ca. 55% content of Ru. The enhancement in electro-catalytic activity is attributed to a reduction in the electronic charge density of Pt upon Ru doping.

碱性介质中氢氧化反应催化剂的研究和开发是碱性聚合物电解质燃料电池商业化的前提。发现Pt Ru双金属催化剂对HOR的活性比碱性Pt高，但仍缺乏Pt Ru合金的组成-活性关系。在这里，一系列的铂使用改进的磁控溅射方法以高通量方式制备具有14种不同组成的Ru合金平面电极。样品中Pt的原子比控制在6.7％至99.7％之间。通过转盘电极法系统地测量了碱性条件下对HOR的相应电催化活性。揭示了HOR交换电流密度与Ru原子分数之间的火山形状关系，并在约1200℃观察到了最大活性。钌含量55％。电催化活性的提高归因于Ru掺杂时Pt的电荷密度的降低。