Boosting Oxygen Reduction Reaction Performance of Fe Single‐Atom Catalysts Via Precise Control of the Coordination Environment

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract Fe single‐atom on N‐doped carbon (FeN‐C) catalysts emerge as promising alternatives to commercial Pt/C for the oxygen reduction reaction. Heterogeneous atom doping is proposed be effective modulating catalyst performance. Despite this, relationship between fine coordination structure of doped atoms and catalytic activity central metal site remains poorly understood. Herein, with S in either first shell (FeSN–C) or second (FeN–SC) active are synthesized compare effects different structure. FeN–SC exhibits prominent performance a half‐wave potential 0.92 V rotating disk electrode peak power density 251 mW cm −2 zinc–air battery. Theoretical studies reveal that effectively modulates electronic charge transfer at center. Compared directly coordinated within shell, located more optimizing adsorption desorption energy barriers oxygen‐containing intermediates sites. This study provides new strategy adjust by engineering multilayer center catalyst.

Language: Английский

Triggering Synergistic Electronic Effect via Electron‐Directed Transfer within Pt_NPs‐Fe/NC Oxygen Reduction Catalyst for Zinc‐Air Batteries

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Abstract Rationally tuning Fe‐N‐C catalysts with synergistic nanoparticles for efficient oxygen reduction reaction (ORR) still remains challenging. Here, a nitrogen‐doped carbon‐supported bimetallic catalyst (Pt NPs ‐Fe/NC), combining atomically dispersed sites Pt nanoparticles, is synthesized. Experimental results reveal directional electron transfer between and Fe sites, which induces an effect, effectively modulating the density around sites. The modulation significantly enhances ORR catalytic activity of ‐Fe/NC. As result, ‐Fe/NC displays half‐wave potential 0.901 V (versus RHE) Tafel slope 59 mV dec −1 , surpassing performance commercial Pt/C demonstrating accelerated kinetics. In meantime, maintains excellent durability in terms stability as well. When assembled into liquid zinc‐air batteries (ZABs), delivers peak power 201.48 mW cm −2 specific capacity 809 mAh g . Additionally, ‐Fe/NC‐based flexible ZABs display outstanding discharge cycling stability. This work highlights effectiveness multiscale advancing provides valuable insights construction strategies energy storage applications.

Language: Английский

Engineering biomass into advanced carbon-based materials for Zn-air batteries

Science China Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 27, 2025

Language: Английский