School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China.
Shenzhen Key Laboratory of Flexible Printed Electronics Technology, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China.
Small. 2022 Jun;18(25):e2202071. doi: 10.1002/smll.202202071. Epub 2022 May 23.
The development of low-Pt catalysts with high activity and durability is critical for fuel cells. Here, Pt-skin wrapped sub-5 nm PtCo intermetallic nanoparticles are successfully mounted on single atom Co-N-C support by exploiting the barrier effect of Co-anchor. According to a collaborative experimental and computational investigation, the increased oxygen reduction reaction activity of PtCo/Co-N-C arises from the direct electron transfer from PtCo to Co-N-C, and the resulting optimal d-band center of Pt. Owing to such unique electronic structure interaction and synergistic effect, the specific and mass activities of PtCo/Co-N-C are up to 4.20 mA cm and 2.71 A mg , respectively, with barely degraded stability after 40 000 CV cycles. The PtCo/Co-N-C also exhibits outstanding activity as an ethanol electrocatalyst. This work shows a new and effective route to boost the overall efficiency of direct ethanol fuel cells in acidic media by integrating intermetallic low-Pt alloys and single atom carbon support.
开发具有高活性和耐久性的低铂催化剂对于燃料电池至关重要。在这里，通过利用 Co 锚的阻挡效应，成功地将包裹在 Pt 皮中的亚 5nm PtCo 金属间化合物纳米颗粒负载在单原子 Co-N-C 载体上。根据协同实验和计算研究，PtCo/Co-N-C 的氧还原反应活性的提高源于 PtCo 向 Co-N-C 的直接电子转移，以及由此产生的 Pt 的最佳 d 带中心。由于这种独特的电子结构相互作用和协同效应，PtCo/Co-N-C 的比活性和质量活性分别高达 4.20 mA cm 和 2.71 A mg ，经过 40000 次 CV 循环后稳定性几乎没有下降。PtCo/Co-N-C 作为乙醇电催化剂也表现出优异的性能。这项工作展示了一种新的有效途径，通过整合金属间低铂合金和单原子碳载体，提高酸性介质中直接乙醇燃料电池的整体效率。
