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Three-Dimensional Engineering of Nanoparticles To Fabricate a Pd–Au Aerogel as an Advanced Supportless Electrocatalyst for Low-Temperature Direct Ethanol Fuel Cells
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-08 00:00:00 , DOI: 10.1021/acsaem.0c00928 Abdollatif Shafaei Douk 1 , Hamideh Saravani 1 , Mehdi Zareie Yazdan Abad 1 , Meissam Noroozifar 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-08 00:00:00 , DOI: 10.1021/acsaem.0c00928 Abdollatif Shafaei Douk 1 , Hamideh Saravani 1 , Mehdi Zareie Yazdan Abad 1 , Meissam Noroozifar 1
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Porous noble metal aerogels have emerged as an attractive target in the scientific community owing to their diverse applications. Nonetheless, their formation and development still face vital problems such as complexity and long gelation times. In this paper, we report a facile, one-pot, and short gelation time strategy for making a Pd–Au aerogel consisting of extended metal backbones by using a self-assembly process. The Pd–Au aerogel is achieved by reducing H2PdCl4 and HAuCl4·3H2O as metal precursors in the presence of sodium carbonate by using glyoxylic acid monohydrate as a reductant, followed by supercritical CO2 drying. In this process, the kinetics and the type of reaction product are controlled by sodium carbonate concentration. Characterization of the highly porous three-dimensional network is performed by utilizing field emission scanning electron microscopy, high-resolution transmission electron microscopy, selected area electron diffraction, transmission electron microscopy, nitrogen isotherm, X-ray diffraction, and inductively coupled plasma–atomic emission spectroscopy analyses. The resultant aerogel is applied as an advanced three-dimensional supportless catalyst for the oxidation reaction of ethanol in direct ethanol fuel cells at low temperatures (25 and 40 °C) in alkaline media and depicts an extraordinary electrocatalytic performance compared to that of Pd/C. The excellent efficiency of the three-dimensional architecture as an advanced electrocatalyst is ascribed to its amazing characteristics such as being supportless, macroporous, mesoporous, and microporous. In addition, the existence of a cometal (Au) in the structure of the Pd–Au aerogel can increase the chance for improving the adsorption of OHads onto the aerogel surface, thus helping to improve the oxidation process of ethanol. Undoubtedly, the resultant aerogel can be utilized as a promising anode component for direct ethanol fuel cells.
中文翻译：
纳米粒子的三维工程，以制造Pd-Au气凝胶作为用于低温直接乙醇燃料电池的高级无载体电催化剂
多孔贵金属气凝胶由于其广泛的用途已成为科学界的一个有吸引力的目标。然而，它们的形成和发展仍然面临诸如复杂性和长胶凝时间的重要问题。在本文中，我们报告了一种通过自组装过程制备由扩展金属骨架组成的Pd-Au气凝胶的简便，一锅又短的胶凝时间策略。在碳酸钠存在下，通过使用乙醛酸一水合物作为还原剂，还原H 2 PdCl 4和HAuCl 4 ·3H 2 O作为金属前体来实现Pd-Au气凝胶，然后使用超临界CO 2烘干。在此过程中，动力学和反应产物的类型由碳酸钠浓度控制。通过利用场发射扫描电子显微镜，高分辨率透射电子显微镜，选定区域电子衍射，透射电子显微镜，氮等温线，X射线衍射和电感耦合等离子体-原子发射来进行高度多孔三维网络的表征光谱分析。所得气凝胶被用作先进的三维无载体催化剂，用于碱性介质中低温（25和40°C）下直接乙醇燃料电池中乙醇的氧化反应，与Pd / C相比具有非凡的电催化性能。 。三维结构作为高级电催化剂的出色效率归因于其惊人的特性，例如无载体，大孔，中孔和微孔。此外，Pd–Au气凝胶结构中存在彗星（Au）可以增加改善OH吸附的机会广告在气凝胶上的表面上，从而有助于提高的乙醇的氧化过程。毫无疑问，所得的气凝胶可用作直接乙醇燃料电池的有希望的阳极组分。
更新日期：2020-07-08
中文翻译：
纳米粒子的三维工程，以制造Pd-Au气凝胶作为用于低温直接乙醇燃料电池的高级无载体电催化剂
多孔贵金属气凝胶由于其广泛的用途已成为科学界的一个有吸引力的目标。然而，它们的形成和发展仍然面临诸如复杂性和长胶凝时间的重要问题。在本文中，我们报告了一种通过自组装过程制备由扩展金属骨架组成的Pd-Au气凝胶的简便，一锅又短的胶凝时间策略。在碳酸钠存在下，通过使用乙醛酸一水合物作为还原剂，还原H 2 PdCl 4和HAuCl 4 ·3H 2 O作为金属前体来实现Pd-Au气凝胶，然后使用超临界CO 2烘干。在此过程中，动力学和反应产物的类型由碳酸钠浓度控制。通过利用场发射扫描电子显微镜，高分辨率透射电子显微镜，选定区域电子衍射，透射电子显微镜，氮等温线，X射线衍射和电感耦合等离子体-原子发射来进行高度多孔三维网络的表征光谱分析。所得气凝胶被用作先进的三维无载体催化剂，用于碱性介质中低温（25和40°C）下直接乙醇燃料电池中乙醇的氧化反应，与Pd / C相比具有非凡的电催化性能。 。三维结构作为高级电催化剂的出色效率归因于其惊人的特性，例如无载体，大孔，中孔和微孔。此外，Pd–Au气凝胶结构中存在彗星（Au）可以增加改善OH吸附的机会广告在气凝胶上的表面上，从而有助于提高的乙醇的氧化过程。毫无疑问，所得的气凝胶可用作直接乙醇燃料电池的有希望的阳极组分。
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