Anchoring Fe Species on the Highly Curved Surface of S and N Co-Doped Carbonaceous Nanosprings for Oxygen Electrocatalysis and a Flexible Zinc-Air Battery

作者：Wang, Yanzhi; Yang, Taimin; Fan, Xing; Bao, Zijia; Tayal, Akhil; Tan, Huang; Shi, Mengke; Liang, Zuozhong; Zhang, Wei; Lin, Haiping^*; Cao, Rui; Huang, Zhehao^*; Zheng, Haoquan^*

来源：Angewandte Chemie - International Edition, 2024.

DOI：10.1002/anie.202313034

• Curved Surface
• Iron
• Nanospring
• Oxygen Reduction Reaction
• Zn-Air Battery

Oxygen reduction reaction (ORR) is of critical significance in the advancement of fuel cells and zinc-air batteries. The iron-nitrogen (Fe-Nx) sites exhibited exceptional reactivity towards ORR. However, the task of designing and controlling the local structure of Fe species for high ORR activity and stability remains a challenge. Herein, we have achieved successful immobilization of Fe species onto the highly curved surface of S, N co-doped carbonaceous nanosprings (denoted as FeNS/Fe3C@CNS). The induction of this twisted configuration within FeNS/Fe3C@CNS arose from the assembly of chiral templates. For electrocatalytic ORR tests, FeNS/Fe3C@CNS exhibits a half-wave potential (E1/2) of 0.91 V in alkaline medium and a E1/2 of 0.78 V in acidic medium. The Fe single atoms and Fe3C nanoparticles are coexistent and play as active centers within FeNS/Fe3C@CNS. The highly curved surface, coupled with S substitution in the coordination layer, served to reduce the energy barrier for ORR, thereby enhancing the intrinsic catalytic activity of the Fe single-atom sites. We also assembled a wearable flexible Zn-air battery using FeNS/Fe3C@CNS as electrocatalysts. This work provides new insights into the construction of highly curved surfaces within carbon materials, offering high electrocatalytic efficacy and remarkable performance for flexible energy conversion devices. @@@ Anchoring Fe species on the highly curved surface of S and N co-doped carbonaceous nanosprings has been achieved (denoted as FeNS/Fe3C@CNS). FeNS/Fe3C@CNS exhibits high activities and stabilities in both alkaline and acidic medium. The excellent performance is attributed to the high curved surface and the incorporation of S that enhances the inherent catalytic activity of Fe single-atom active sites.+image

• 单位
  北京大学; 四川大学