采用热分解法制备了一元、二元贵金属形稳阳极(DSA), 并用扫描电子显微镜(SEM)、X射线衍射(XRD)、能量散射X射线谱(EDS)等测试技术对所制备电极的表面形貌、成分组成等进行分析表征;在煤浆电解过程中,采用两电极体系,对所制备电极的电催化活性进行了测试.结果表明,催化涂层中Ru、Ir主要以氧化物或合金的形式存在,而Pt主要以金属单质或合金的形式存在,用所制备的电极作为阳极,电解煤浆10 h以后,电流大小和气体的生成速率比较稳定,在整个电解过程中,H_2气的电解效率一直接近100%,而此时阳极产物的电解效率为40%左右.与Ti/Pt电极相比,电极的催化活性均有较大的提高,其中Ti/Pt-RuO_2(1:1)和Ti/Pt-IrO_2(1:1)电极的活性最好.
Precious metal catalytic electrodes were prepared by thermal decomposition. The surface and the composition of the electrodes were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD) and energy dispersive X-ray spectroscopy(EDS). The electro-catalytic activity of the electrodes was tested for the electrolysis of coal slurry using the two-electrode system. The results show that in the catalytic coating, Pt exists in the form of Pt, but Ru, Ir exist in the form of oxides. After electrolysis with the electrodes for 10 h, the current and gas production rate were relatively stable, and in the whole process of electrolysis, hydrogen electrolysis efficiency was close to 100%, the anode electrolysis efficiency to 40%. Compared with that of the Ti/Pt electrode,the catalytic activity of the electrodes, especially the dual-dimensional Ti/Pt-RuO_2(1:1) and Ti/Pt-IrO_2(1:1) has been greatly improved.
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