College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, China.
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu, 215123, China.
Adv Mater. 2018 Mar;30(11). doi: 10.1002/adma.201706962. Epub 2018 Jan 16.
The development of highly active and stable electrocatalysts for ethanol electroxidation is of decisive importance to the successful commercialization of direct ethanol fuel cells. Despite great efforts invested over the past decade, their progress has been notably slower than expected. In this work, the facile solution synthesis of 2D PdAg alloy nanodendrites as a high-performance electrocatalyst is reported for ethanol electroxidation. The reaction is carried out via the coreduction of Pd and Ag precursors in aqueous solution with the presence of octadecyltrimethylammonium chloride as the structural directing agent. Final products feature small thickness (5-7 nm) and random in-plane branching with enlarged surface areas and abundant undercoordinated sites. They exhibit enhanced electrocatalytic activity (large specific current ≈2600 mA mgPd-1) and excellent operation stability (as revealed from both the cycling and chronoamperometric tests) for ethanol electroxidation. Control experiments show that the improvement comes from the combined electronic and structural effects.
开发高效稳定的乙醇电氧化电催化剂对于直接乙醇燃料电池的商业化至关重要。尽管在过去十年中投入了巨大的努力，但它们的进展明显比预期的要慢。在这项工作中，我们报道了二维 PdAg 合金纳米树枝状结构作为高性能电催化剂通过简单的溶液法合成，用于乙醇电氧化。该反应是通过在含有十八烷基三甲基氯化铵的水溶液中，钯和银前驱体的共还原来进行的，十八烷基三甲基氯化铵作为结构导向剂。最终产物具有小的厚度（5-7nm）和随机的面内分支，具有较大的表面积和丰富的低配位位。它们表现出增强的电催化活性（大的比电流≈2600 mA mgPd-1）和优异的操作稳定性（从循环和计时安培测试中可以看出），用于乙醇电氧化。对照实验表明，这种改进来自于电子和结构的综合效应。
