Yan Xiaoxiao, Hu Xuejiao, Fu Gengtao, Xu Lin, Lee Jong-Min, Tang Yawen
Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.
School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore.
Small. 2018 Mar;14(13):e1703940. doi: 10.1002/smll.201703940. Epub 2018 Feb 6.
Exploring highly efficient electrocatalysts is greatly important for the widespread uptake of the fuel cells. However, many newly generated nanocrystals with attractive nanostructures often have extremely limited surface area or large particle-size, which leads them to display limited electrocatalytic performance. Herein, a novel anode catalyst of hollow and porous Pd Pt half-shells with rich "active sites" is synthesized by using urea as a guiding surfactant. It is identified that the formation of Pd Pt half-shells involves the combination of bubble guiding, in situ deposition of particles and bubble burst. The obtained Pd Pt half-shells demonstrate a rich edge area with abundant exposed active sites and surface defects, indicating great potential for the electrocatalysis. When used as an electrocatalyst, the Pd Pt half-shells exhibit remarkably improved electrocatalytic performance for formic acid oxidation (FAO), where it promotes the dehydrogenation process of FAO by suppressing the formation of poisonous species CO via the electronic effect and ensemble effect.
探索高效的电催化剂对于燃料电池的广泛应用至关重要。然而，许多具有吸引人的纳米结构的新生成纳米晶体往往表面积极其有限或粒径较大，这导致它们表现出有限的电催化性能。在此，通过使用尿素作为导向表面活性剂，合成了一种具有丰富“活性位点”的新型空心多孔Pd Pt半壳阳极催化剂。据确定，Pd Pt半壳的形成涉及气泡导向、颗粒原位沉积和气泡破裂的结合。所获得的Pd Pt半壳显示出具有丰富暴露活性位点和表面缺陷的边缘区域，表明其在电催化方面具有巨大潜力。当用作电催化剂时，Pd Pt半壳对甲酸氧化（FAO）表现出显著改善的电催化性能，通过电子效应和协同效应抑制有毒物种CO的形成，促进了FAO的脱氢过程。
