Issue 24, 2019

N,P co-coordinated Fe species embedded in carbon hollow spheres for oxygen electrocatalysis

Abstract

The increasing interest in fuel cell technology and metal–air batteries has led to the need for stable and effective catalyst materials to replace noble metal (such as Pt) based benchmarks for the oxygen reduction reaction (ORR). In this study, carbon hollow spheres with highly dispersed nitrogen and phosphorus co-coordinated iron atoms (FeNPC) on their surface have been successfully fabricated, exhibiting exceptional ORR activity in both alkaline and acidic solutions. Specifically, the obtained FeNPC catalyst is capable of catalyzing the ORR with an onset potential of 1.03 V and a half-wave potential of 0.88 V (both vs. the reversible hydrogen electrode) in alkaline solution, outperforming the commercial Pt/C catalyst under identical conditions. Experimental results and theoretical simulations reveal that the quasi-octahedral O2-FeNxPy species are the active sites of the FeNPC composite. These species modify the electronic configuration of Fe centers and weaken the adsorption of the OH* intermediate, thereby promoting the ORR process. Additionally, the FeNPC catalyst also displays a catalytic activity towards the anodic oxygen evolution reaction (OER), making it an active air electrode catalyst in rechargeable Zn–air batteries with a high peak power density of 233.2 mW cm−2 and an excellent cycling stability at 3 mA cm−2 for over 15 h.

Graphical abstract: N,P co-coordinated Fe species embedded in carbon hollow spheres for oxygen electrocatalysis

Supplementary files

Article information

Article type
Paper
Submitted
20 Нау. 2019
Accepted
22 Мам. 2019
First published
22 Мам. 2019

J. Mater. Chem. A, 2019,7, 14732-14742

N,P co-coordinated Fe species embedded in carbon hollow spheres for oxygen electrocatalysis

X. Zhu, X. Tan, K. Wu, C. Chiang, Y. Lin, Y. Lin, D. Wang, S. Smith, X. Lu and R. Amal, J. Mater. Chem. A, 2019, 7, 14732 DOI: 10.1039/C9TA03011E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements