Cheng Aozhi, Wang Yuan, Ma Liang, Lin Ling, Zhou Haibo
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong 510006, People's Republic of China.
Nanotechnology. 2020 Oct 23;31(43):435403. doi: 10.1088/1361-6528/aba3da. Epub 2020 Jul 8.
The high cost of Pt-based catalysts impedes the practical large-scale commercial application of fuel cells. Controlling the morphology of Pt nanostructure is one of the most promising approaches to promote the electrocatalytical activity and stability toward methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). Herein, we report a facile method for the synthesis of Pt nanodendrites consisting a dense array of dendrites using KPtCl as metal resource, L-ascorbic acid as reducing agent and hexadecyltrimethylammonium chloride as capping agent in aqueous solution at 96 °C for 30 min. Owing to the novel structure, the obtained Pt nanodendritic electrocatalyst exhibites superior MOR catalytic performance and particularly long-term stability both in acid and alkaline conditions. the Pt nanodendrites also exhibited a higher half wave potential of 0.86 V and lower tafel slope of 51.69 mV dec when compared with 20% Pt/C (0.83 V, 93.55 mV dec) in acid conditions toward ORR. This work provides a promising way for the rational design of efficient and robust catalysts for sustainable energy conversion.
铂基催化剂的高成本阻碍了燃料电池在实际中的大规模商业应用。控制铂纳米结构的形态是提高其对甲醇氧化反应（MOR）和氧还原反应（ORR）的电催化活性及稳定性最具前景的方法之一。在此，我们报道了一种简便的合成铂纳米枝晶的方法，该方法以氯铂酸钾为金属源、L-抗坏血酸为还原剂、十六烷基三甲基氯化铵为封端剂，在96℃的水溶液中反应30分钟，合成出由密集枝晶阵列组成的铂纳米枝晶。由于其新颖的结构，所制备的铂纳米枝晶电催化剂在酸性和碱性条件下均表现出优异的MOR催化性能以及特别长的稳定性。在酸性条件下，与20% Pt/C（0.83 V，93.55 mV dec）相比，铂纳米枝晶对ORR还表现出更高的半波电位0.86 V和更低的塔菲尔斜率51.69 mV dec。这项工作为合理设计用于可持续能源转换的高效且稳定的催化剂提供了一条有前景的途径。
