In:
Small, Wiley, Vol. 18, No. 26 ( 2022-07)
Abstract:
Electrochemical reduction of oxygen plays a critical role in emerging electrochemical energy technologies. Multiple electron transfer processes, involving adsorption and activation of O 2 and generation of protons from water molecules, cause the sluggish kinetics of the oxygen reduction reaction (ORR). Herein, a double‐active‐site catalyst of Fe 3 C nanoparticles coupled to paulownia wood‐derived N‐doped carbon (Fe 3 C@NPW) is fabricated via an active‐site‐uniting strategy. One site on Fe 3 C nanoparticles contributes to activating water molecules, while another site on N‐doped carbon is responsible for activating oxygen molecules. Benefiting from the synergistic effect of double active sites, Fe 3 C@NPW delivers a remarkable catalytic activity for ORR with a half‐wave potential of 0.87 V (vs. RHE) in alkaline electrolyte, outperforming commercial Pt/C catalyst. Moreover, zinc–air batteries (ZABs) assembled with Fe 3 C@NPW as a catalyst on cathode achieve a large specific capacity of 804.4 mA h g Zn −1 and a long‐term stability of 780 cycles. The model solid‐state ZABs also display satisfactory performances with an open‐circuit voltage of 1.39 V and a high peak power density of 78 mW cm −2 . These outstanding performances reach the level of first‐rank among the non‐noble metal electrode materials. This work offers a promising approach to creating double‐active‐site catalysts by the active‐site‐uniting strategy for energy conversion fields.
Type of Medium:
Online Resource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.202202014
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2168935-0
Permalink