Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China.
Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China; Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China.
J Colloid Interface Sci. 2023 May;637:173-181. doi: 10.1016/j.jcis.2023.01.082. Epub 2023 Jan 20.
Platinum-based (Pt) catalysts are the most common commercial catalysts for oxygen reduction reactions (ORR). Unfortunately, their high price, scarcity and poor durability hinder their further development. Therefore, the development of effective and economical ORR electrocatalysts has received increasing attention. Here, carbon dots (CDs) enriched in amino functional groups were successfully loaded onto carbon nanotubes (CNTs) with a large surface area and helical structure through a surface state engineering strategy. The resulting composites (CD/CNTs) are 0D/1D nano heterojunction structures. The CD/CNTs showed superior ORR activity compared with CNTs and CDs (E = 0.95 V, E = 0.81 V and limiting current density = 4.74 mA cm). In addition, the stability of CD/CNTs in an alkaline medium was up to 30000 s. The excellent ORR performance of CD/CNTs can be attributed to the dominant role of amino-N, the synergistic effect of heterojunctions formed by CDs and CNTs, and the high Lewis basicity. The composite electrocatalyst synthesized by the CD-regulated CNT strategy is expected to be a reliable cathode candidate for future energy conversion devices.
铂（Pt）基催化剂是最常见的用于氧还原反应（ORR）的商业催化剂。然而，其高价格、稀缺性和较差的耐久性阻碍了它们的进一步发展。因此，开发有效且经济的 ORR 电催化剂受到了越来越多的关注。在这里，通过表面态工程策略，成功地将富含氨基官能团的碳点（CDs）负载到具有大表面积和螺旋结构的碳纳米管（CNTs）上。得到的复合材料（CD/CNTs）是 0D/1D 纳米异质结结构。与 CNTs 和 CDs 相比，CD/CNTs 表现出优异的 ORR 活性（E=0.95 V，E=0.81 V 和极限电流密度=4.74 mA cm）。此外，CD/CNTs 在碱性介质中的稳定性高达 30000 s。CD/CNTs 优异的 ORR 性能归因于氨基-N 的主导作用、CDs 和 CNTs 形成的异质结的协同效应以及高路易斯碱性。通过 CD 调控 CNT 策略合成的复合电催化剂有望成为未来能源转换设备中可靠的阴极候选材料。
