Lukas Heinius, Malte Klingenhof, Gregor Weiser, Pierre Schröer, Lukas Metzler, Susanne Koch, Sören Selve, Severin Vierrath, Peter Strasser
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引用次数: 0
Abstract
The influence of the nature of carbon-support materials on the structure and the electrochemical performance of NiMo cathode catalysts is investigated. Carbon materials addressed in this study include Ketjen Black, Vulcan and MWCNT-COOH. A one pot, easily scalable, hydrothermal microwave synthesis with a subsequent hydrogen reduction step was applied for the preparation of the catalyst materials. The structures and compositions of the catalysts were characterized by TEM/SEM, XRD, ICP-OES, BET and STEM-EDX. The performance of the catalysts was tested using rotating disc electrode (RDE) and anion exchange membrane (AEM) single-cell electrolyser to downselect the most active material. The influence of pH, catalyst loading and type of carbon support was investigated to optimize the operating conditions. By increasing the KOH concentration from 0.1 to 1 M in an AEM electrolysis cell, the current density could be more than doubled, whereas the introduction of a carbon support raised the current density by a factor of seven. Finally, it is demonstrated how applying a novel bar-coating preparation of the electrodes in a PGM-free AEM electrolyser enabled a favourable current density of 1 A cm−2 at 2.04 V. This performance is comparable to earlier systems but requires only a fraction of the catalyst loading.
研究了碳载体材料的性质对镍氧化物阴极催化剂结构和电化学性能的影响。本研究涉及的碳材料包括Ketjen Black、Vulcan和MWCNT-COOH。采用一锅,易于扩展,水热微波合成和随后的氢还原步骤制备催化剂材料。采用TEM/SEM、XRD、ICP-OES、BET和STEM-EDX对催化剂的结构和组成进行了表征。采用旋转圆盘电极(RDE)和阴离子交换膜(AEM)单电池电解槽对催化剂的性能进行了测试,筛选出活性最高的材料。考察了pH、催化剂负载和碳载体类型对反应的影响,优化了反应条件。通过将AEM电解池中的KOH浓度从0.1 M增加到1m,电流密度可以增加一倍以上,而碳载体的引入将电流密度提高了7倍。最后,演示了如何在无pgm的AEM电解槽中应用新型棒状涂层制备电极,从而在2.04 V下实现1 a cm - 2的有利电流密度。这种性能与早期的系统相当,但只需要一小部分催化剂负载。