Wang Cui, Wu Chenshuo, Xing Lixiang, Duan Wenchao, Zhang Xiang, Cao Yi, Xia Haibing
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.
ACS Appl Mater Interfaces. 2020 Sep 2;12(35):39033-39042. doi: 10.1021/acsami.0c08914. Epub 2020 Aug 18.
In this work, a series of Au aerogels with different percentages of {110} facets (from ∼12 to 36%) were controllably prepared and then used to investigate their performance (specific activity and long-term stability) toward ethylene glycol oxidation reaction (EGOR), in which PNR represents the particle number ratio of 6 nm Au NPs to 50 nm Au NPs. It is found that their specific activity and long-term stability highly depend on the sum of the percentage of the {100} and {111} facets and the percentage of {110} facets, respectively. In addition, Au aerogels with the highest percentage of {110} facets can possess excellent long-term stability (retaining about 95% of the initial current) but still have excellent specific activity (about 90.42 mA cm). Thus, the specific activity and long-time stability of Au aerogels toward EGOR can be well balanced by controlling the proper percentage of {110} facets on their surfaces. Therefore, the successful fabrication of Au aerogels with greatly improved long-term stability and excellent specific activity not only provides a novel method for the design of electrocatalysts but also would boost the commercial development of direct ethylene glycol fuel cells.
在这项工作中，可控地制备了一系列具有不同{110}面百分比（从~12%到36%）的金气凝胶，然后用于研究它们对乙二醇氧化反应（EGOR）的性能（比活性和长期稳定性），其中PNR表示6 nm金纳米颗粒与50 nm金纳米颗粒的颗粒数比。研究发现，它们的比活性和长期稳定性分别高度依赖于{100}面和{111}面百分比之和以及{110}面百分比。此外，{110}面百分比最高的金气凝胶可具有出色的长期稳定性（保留约95%的初始电流），但仍具有出色的比活性（约90.42 mA/cm²）。因此，通过控制其表面{110}面的适当百分比，可以很好地平衡金气凝胶对EGOR的比活性和长期稳定性。因此，成功制备出具有大大提高的长期稳定性和出色比活性的金气凝胶，不仅为电催化剂的设计提供了一种新方法，也将推动直接乙二醇燃料电池的商业发展。
