Issue 48, 2020

Engineering efficient bifunctional electrocatalysts for rechargeable zinc–air batteries by confining Fe–Co–Ni nanoalloys in nitrogen-doped carbon nanotube@nanosheet frameworks

Abstract

Developing precious-metal-free bifunctional oxygen reduction and evolution reaction (ORR/OER) electrocatalysts is of great significance for several key energy conversion and storage systems, yet remains a formidable challenge. Herein, we systematically designed Fe–Co–Ni trimetallic nanoalloys encapsulated in nitrogen-doped carbon nanotube@nanosheet frameworks (FeCoNi-NC) for application as effective bifunctional ORR/OER electrocatalysts. The rational structural design of FeCoNi-NC provides hierarchical porosity coupled with greatly increased effective electrochemical specific area for exposing abundant active sites and enhanced mass-transfer capability toward the ORR/OER. Experimental observations and theoretical calculations confirmed that Fe–Co–Ni nanoalloys interacting with pyridinic nitrogen-rich carbon synergistically optimized the adsorption/desorption free energies of oxygen intermediates, thus significantly enhancing the intrinsic ORR/OER activity. Consequently, FeCoNi-NC exhibits remarkable bifunctionality for the ORR (half-wave potential of 0.89 V) and OER (1.54 V at 10 mA cm−2) with ΔE = 0.65 V, and even outperforms Pt/C–RuO2 benchmarks. Moreover, the corresponding zinc–air battery shows large power density (315.2 mW cm−2), high capacity (803.78 mA h g−1 at 100 mA cm−2) and excellent cycling durability (over 100 hours at 50 mA cm−2), further testifying its practical applications. This work demonstrates an effective pathway to highly active non-precious-metal bifunctional catalysts toward sustainable energy technologies.

Graphical abstract: Engineering efficient bifunctional electrocatalysts for rechargeable zinc–air batteries by confining Fe–Co–Ni nanoalloys in nitrogen-doped carbon nanotube@nanosheet frameworks

Supplementary files

Article information

Article type
Paper
Submitted
30 Sep 2020
Accepted
14 Nov 2020
First published
18 Nov 2020

J. Mater. Chem. A, 2020,8, 25919-25930

Engineering efficient bifunctional electrocatalysts for rechargeable zinc–air batteries by confining Fe–Co–Ni nanoalloys in nitrogen-doped carbon nanotube@nanosheet frameworks

X. Tang, R. Cao, L. Li, B. Huang, W. Zhai, K. Yuan and Y. Chen, J. Mater. Chem. A, 2020, 8, 25919 DOI: 10.1039/D0TA09580J

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