Increased utilization and mass activity of PtRu on reduced graphene oxide by heat treatment of its aerogel followed by composite with nanomaterials
Increased utilization and mass activity of PtRu on reduced graphene oxide by heat treatment of its aerogel followed by composite with nanomaterials
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DOI：
10.1016/j.crcon.2023.02.007
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发表时间：
2023-03
影响因子：
6
通讯作者：
Kenta Dejima;H. Ishitobi;He Gao;Mai Saito;N. Nakagawa
中科院分区：
文献类型：
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作者：
Kenta Dejima;H. Ishitobi;He Gao;Mai Saito;N. Nakagawa
为了开发直接甲醇燃料电池的活性催化剂，提出了一种通过避免PtRu重堆积来提高PtRu利用率及其催化活性的方法。采用冷冻干燥法制备的GO气凝胶(GOA)在200℃下进行热处理，以减弱GO片间氢键的吸引力，然后在不同的质量比下与纳米粒子Kb、TiO2和Ti4O7复合。与PtRu/RGO催化剂相比，热处理后的催化剂PtRu/RGOA在一定程度上提高了PtRu的利用率，同时也提高了ECSA和质量活性。RGOA的含氧基团较少，尤其是环氧基团。经过处理和复合，PtRu的利用率从PtRu/RGO的66.5%提高到PtRu/RGO+Ti4O7(4：1)的128.6%，质量活度从PtRu/RGO的50.7A/g-PtRu提高到130.5 A/g-PtRuPtRu/RGO+Ti4O7(1：1)。Ti4O7纳米粒子对复合材料的催化性能最好，这表明Ti4O7与铂纳米粒子之间的强相互作用是有效的，因为它具有较高的电子导电性。
The method to increase PtRu utilization and its catalytic activity of PtRu nanoparticles supported on reduced graphene oxide (RGO) by avoiding its restacking was proposed with the aim of developing an active catalyst for a direct methanol fuel cell. The heat treatment at 200 °C of the GO aerogel (GOA) prepared by freeze drying of GO ice was introduced to weaken the attractive force of the hydrogen bonding between the GO sheets followed by the composite with the nanoparticles, i.e., ketjenblack (KB), TiO2and Ti4O7, at different weight ratios. The catalyst supported on the heat-treated GOA (RGOA), PtRu/RGOA, improved the PtRu utilization to some extent and also increased the ECSA and mass activity compared to that of PtRu/RGO. RGOA had fewer oxygen functional groups, especially the epoxy groups. Due to the treatment and composite, the PtRu utilization was increased from 66.5% for PtRu/RGO to 128.6 % for PtRu/RGOA + Ti4O7(4:1) and the mass activity was improved from 50.7 A/g-PtRufor PtRu/RGO to 130.5 A/g-PtRufor PtRu/RGOA + Ti4O7(1:1). The Ti4O7nanoparticles showed the best catalytic performance for the composite suggesting that the strong interaction between Ti4O7and the Pt nanoparticles was effective due to its high electronic conductivity.