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首页> 外文期刊>RSC Advances >The effect of hydrothermal treatment time and level of carbon coating on the performance of PtRu/C catalysts in a direct methanol fuel cell
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The effect of hydrothermal treatment time and level of carbon coating on the performance of PtRu/C catalysts in a direct methanol fuel cell

机译：直接甲醇燃料电池中水热处理时间和碳涂层量对PtRu / C催化剂性能的影响

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摘要

A carbon-riveted PtRu/C catalyst of high stability has been prepared by in situ glucose carbonization using a hydrothermal method (GICH). Its mode of action and its practical application have been investigated by Xray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, a single-fuel cell test, and by conventional electrochemical measurements. The single-fuel cell test has demonstrated that the GICH hydrothermal method has high applicational usefulness. After 100 h the maximum power density of a single cell using carbon-riveted PtRu/C as anode catalyst fell by only 12.0%, from 76.6 to 67.4 mW cm(-2), compared with 28.4%, from 73.2 to 52.4 mW cm(-2), for traditionally prepared PtRu/C. In addition, when the optimal hydrothermal treatment time was 4 h and the level of carbon coating was 9%, a carbon-riveted PtRu/C catalyst with a 3.5 nm carbon coating gave the best stability, with similar initial activity to traditionally prepared PtRu/C. The significantly increased stability of carbon-riveted PtRu/C may be attributed to two factors: (1) the anchoring effect of the carbon nanolayer formed during in situ glucose carbonization by the hydrothermal method; and (2) the increased content of Pt(0), Ru(0), sp(3)-hybridized carbon and the C-OR group composition, and the clear decrease in PtO2 and RuOxHy following the carbon-riveting procedure.
机译：使用水热法（GICH）通过原位葡萄糖碳化制备了具有高稳定性的碳铆接PtRu / C催化剂。通过X射线衍射，高分辨率透射电子显微镜，X射线光电子能谱，单燃料电池测试和常规电化学测量研究了其作用方式及其实际应用。单燃料电池测试表明，GICH水热法具有很高的应用价值。 100小时后，使用碳铆接的PtRu / C作为阳极催化剂的单个电池的最大功率密度仅下降了12.0％，从76.6降至67.4 mW cm（-2），而下降了28.4％，从73.2降至52.4 mW cm（-2） -2），用于传统制备的PtRu / C。此外，当最佳水热处理时间为4小时且碳涂层水平为9％时，具有3.5 nm碳涂层的碳铆接PtRu / C催化剂具有最佳的稳定性，其初始活性与传统制备的PtRu / C。碳铆接的PtRu / C的稳定性显着提高可能归因于两个因素：（1）通过水热法原位葡萄糖碳化过程中形成的碳纳米层的锚固作用; （2）碳铆接后，Pt（0），Ru（0），sp（3）杂化碳和C-OR基团的含量增加，而PtO2和RuOxHy明显降低。

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