Nano Research ( IF 9.9 ) Pub Date : 2020-01-03 , DOI: 10.1007/s12274-019-2609-z Xiaolei Yuan , Bei Jiang , Muhan Cao , Congyang Zhang , Xiaozhi Liu , Qinghua Zhang , Fenglei Lyu , Lin Gu , Qiao Zhang
Abstract
High-quality Pt-based catalysts are highly desirable for ethanol oxidation reaction (EOR), which is of critical importance for the commercial applications of direct ethanol fuel cells (DEFCs). However, most of the Pt-based catalysts have suffered from high cost and low operation durability. Herein a two-step method has been developed to synthesize porous Pt nanoframes decorated with Bi(OH)3, which show excellent catalytic activity and operation durability in both alkaline and acidic media. For example, the nanoframes show a mass activity of 6.87 A·mgPt−1 in alkaline media, which is 13.5-fold higher than that of commercial Pt/C. More importantly, the catalyst can be reactivated simply, which shows negligible activity loss after running for 180,000 s. Further in situ attenuated total reflection-infrared (ATR-IR) absorption spectroscopy and CO-stripping experiments indicate that surface Bi(OH)3 species can greatly facilitate the formation of adsorbed OH species and subsequently remove carbonaceous poison, resulting in a significantly enhanced stability towards EOR. This work may favor the tailoring of desired electrocatalysts with high activity and durability for future commercial application of DEFCs.
中文翻译:
Bi(OH)3修饰的多孔Pt纳米框架是乙醇氧化反应的高效稳定的电催化剂
摘要
对于乙醇氧化反应(EOR),非常需要高质量的Pt基催化剂,这对于直接乙醇燃料电池(DEFCs)的商业应用至关重要。然而,大多数Pt基催化剂遭受了高成本和低操作耐久性的困扰。在本文中,已开发出一种两步法来合成装饰有Bi(OH)3的多孔Pt纳米框架,该框架在碱性和酸性介质中均具有出色的催化活性和操作耐久性。例如,纳米框架在碱性介质中显示出6.87 A·mg Pt -1的质量活性,比市售Pt / C的质量活性高13.5倍。更重要的是,催化剂可以简单地重新活化,在运行180000 s后,其活性损失可忽略不计。进一步原位衰减全反射红外(ATR-IR)吸收光谱和CO剥离实验表明,表面Bi(OH)3物质可大大促进吸附的OH物质的形成,并随后除去含碳毒物,从而显着增强了对EOR。这项工作可能有助于定制所需的具有高活性和耐久性的电催化剂,以用于DEFC的未来商业应用。