Boosting Oxygen Electrocatalysis by Combining Iron Nanoparticles with Single Atoms

Liu, Bowen; Wang, Sihong; Song, Fang; Liu, Qinglei

doi:10.3390/catal12060585

Cited by 5 publications

(5 citation statements)

References 33 publications

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“…Additionally, a homogeneous dispersion of nanoparticles, as witnessed in the FE-SEM image of C/Fe.S.N, is possibly the reason for this high activity. The doping mechanism thus leads to improved activity (60-70 mV positively shifted onsets), better dispersion, as reported earlier [46,47], and smaller particles that can optimize ORR processes, which is in line with previous studies [48].…”

Section: Electrochemistrysupporting

confidence: 90%

Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction

et al. 2023

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Electrochemical crosslinking of alginate strands by in situ iron oxidation was explored using a potentiostatic regime. Carbon-based materials co-doped with iron, nitrogen, and/or sulfur were prepared via electrolyte composition variation with a nitrogen-rich compound (rivanol) or through post-treatments with sodium sulfide. Nanometer-sized iron particles were confirmed by transmission and field emission scanning electron microscopy in all samples as a consequence of the homogeneous dispersion of iron in the alginate scaffold and its concomitant growth-limiting effect of alginate chains. Raman spectra confirmed a rise in structural disorder with rivanol/Na2S treatment, which points to more defect sites and edges known to be active sites for oxygen reduction. Fourier transform infrared (FTIR) spectra confirmed the presence of different iron, nitrogen, and sulfur species, with a marked difference between Na2S treated/untreated samples. The most positive onset potential (−0.26 V vs. saturated calomel electrode, SCE) was evidenced for the sample co-doped with N, S, and Fe, surpassing the activity of those with single and/or double doping. The mechanism of oxygen reduction in 0.1 M KOH was dominated by the 2e− reduction pathway at low overpotentials and shifted towards complete 4e− reduction at the most negative explored values. The presented results put forward electrochemically formed alginate gels functionalized by homogeneously dispersed multivalent cations as an excellent starting point in nanomaterial design and engineering.

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Section: Electrochemistrysupporting

confidence: 90%

Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction

et al. 2023

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“…During the preparation process, conditions such as high temperatures tend to promote the formation of metal clusters. Liu et al [123] proposes a new possibility for the development of SACs: the single-atom sites do not need to be uniformly dispersed or maintained for a long time, and in time, the formation of nanoclusters can be synergized with a small number of singleatom sites to enhance the activity of the catalysts. Meanwhile, the design idea also solves the stability problem of SACs.…”

Section: Synergism Between Nanoparticles and Single Atommentioning

confidence: 99%

“…Liu et al. [ 123 ] synthesized Fe@Fe‐SAC composites by a simple two‐step method using sodium alginate as the carbon precursor. TEM images show well‐dispersed nanoparticles embedded in carbon fibers (≈7 nm).…”

Section: Structural Regulation Of Sacs For Oermentioning

confidence: 99%

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Design Principles of Single‐Atom Catalysts for Oxygen Evolution Reaction: From Targeted Structures to Active Sites

Jiang,

Li,

Pan

2023

Advanced Materials

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Hydrogen production from electrolytic water is considered a viable method for hydrogen production with significant social value due to its clean and pollution‐free nature, high hydrogen production efficiency and purity, but the anode oxygen evolution reaction (OER) process is complex and kinetically slow. Single atom catalysts (SACs) with 100% atom utilization and homogeneous active sites often exhibit high catalytic activity and are expected to be extensively applied. The catalytic performance of OER can be further improved by precise regulation of the structure through electronic effects, coordination environment, hybrid atom doping and so on. In this review, we introduce the mechanisms of OER under different conditions, systematically summarize the latest research progress of SACs in the field of OER, then discuss the effects of various structural regulation strategies on catalytic performance, and propose principles and ideas for the design of SACs for OER. In the end, we summarize the outstanding issues and current challenges in this field.This article is protected by copyright. All rights reserved

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“…[ 30 ‐– 33 ] Recently, it has been demonstrated that single metal atoms could synergy with metal nanoparticles to collaboratively improve the performance of electrocatalysts by modifying the electronic structure of metals. [ 34 ‐– 36 ] For example, Yang et al. investigated the synergistic effect of PtSA and CoPt nanoparticles for HER.…”

Section: Introductionmentioning

confidence: 99%

Boosting the Electrocatalytic Performance of CoPt Alloy with Enhanced Electron Transfer via Atomically Dispersed Cobalt Sites

Xue

et al. 2023

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Designing electrocatalysts with strong electronic metal‐support interaction can effectively regulate the electronic properties of metal active centers, therefore maximizing the catalytic performance. As a proof of concept, heteroatoms doped carbon with CoPt alloy and isolated Co single atoms (CoPtCoSA@NSC) are synthesized using CoPt bimetallic metal‐organic framework as the precursor in this work. The existence of CoSA on the carbon substrate leads to more electron transfer between CoPt and the support, and appropriate upward shift of the d band center of the catalysts, which can effectively reduce the reaction barrier of rate determine step and boost the catalytic performance of CoPt alloy. The enhanced catalytic activity and stability of CoPtCoSA@NSC are demonstrated experimentally. Remarkably, the overpotential for hydrogen evolution reaction is only 23 mV at 10 mA cm−2 and the half‐wave potential for oxygen reduction reaction is 0.90 V, both exceeding the commercial Pt/C benchmark. In addition, CoPtCoSA@NSC also exhibits great potential as a cathode electrocatalyst for Zn–air battery, in terms of large open circuit potential of 1.53 V, high power density of 184 mW cm−2, as well as superior cycling stability. This work provides a novel strategy for regulating the electronic structure and catalytic performance of alloy based electrocatalysts.

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Boosting Oxygen Electrocatalysis by Combining Iron Nanoparticles with Single Atoms

Cited by 5 publications

References 33 publications

Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction

Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction

Design Principles of Single‐Atom Catalysts for Oxygen Evolution Reaction: From Targeted Structures to Active Sites

Boosting the Electrocatalytic Performance of CoPt Alloy with Enhanced Electron Transfer via Atomically Dispersed Cobalt Sites

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