Chitosan cross-linked poly(aminoanthraquinone)/Prussian blue ternary nitrogen precursor-derived Fe–N–C oxygen reduction catalysts for microbial fuel cells and zinc–air batteries

Zhang, Guoquan; Li, Li; Chen, Mengyao; Yang, Fenglin

doi:10.1039/d0ta00306a

Cited by 41 publications

(14 citation statements)

References 54 publications

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“…The high‐resolution Fe 2p signals of Fe–Ni ANC@NSCA catalysts (Figure 3C) can be deconvoluted into seven peaks, corresponding to Fe 0 2p 3/2 (708.1 eV) and Fe 0 2p 1/2 (721.4 eV), Fe 2p 3/2 (Fe 2+ /Fe 3+ ions, 713.9 eV) and Fe 2p 1/2 (Fe 2+ /Fe 3+ ions, 724.8 eV), satellite peaks (717.7 and 729.3 eV), and Fe‐N x species (711 eV), respectively. [ 29,56 ] The presence of the peak at about 711 eV further indicates the presence of the Fe‐N x species in Fe–Ni ANC@NSCA catalysts. [ 57,58 ] However, it is rather difficult to distinguish 2p signals of Fe 2+ ions from those of Fe 3+ ions.…”

Section: Resultsmentioning

confidence: 99%

Fe–Ni Alloy Nanoclusters Anchored on Carbon Aerogels as High‐Efficiency Oxygen Electrocatalysts in Rechargeable Zn–Air Batteries

Shu

Tong

et al. 2021

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In this work, Fe–Ni alloy nanoclusters (Fe–Ni ANCs) anchored on N, S co‐doped carbon aerogel (Fe–Ni ANC@NSCA catalysts) are successfully prepared by the optimal pyrolysis of polyaniline (PANI) aerogels derived from the freeze‐drying of PANI hydrogel obtained by the polymerization of aniline monomers in the co‐presence of tannic acid (TA), Fe3+, and Ni2+ ions. In addition, the optimal molar ratio of the TA, Fe3+, and Ni2+ ions for synthesis of Fe–Ni ANC@NSCA catalysts are 1:2:5, which can guarantee the formation of carbon aerogel composed of quasi‐2D porous carbon sheets and the formation of high‐density Fe–Ni ANCs with an ultrasmall size between 2 to 2.8 nm. These Fe–Ni ANCs consisting of N4–Fe–O–Ni–N4 moiety are proposed as a new type of active species for the first time, to the best of the authors’ knowledge. Thanks to their unique features, the Fe–Ni ANC@NSCA catalysts show excellent performance in oxygen reduction reaction with a half‐wave potential (E1/2) of 0.891 V and oxygen evolution reaction (260 mV @ 10 mA cm−2) in alkaline media as bifunctional catalysts, which are better than the state‐of‐the‐art commercial Pt/C catalysts and RuO2 catalysts. Moreover, Zn–air battery assembled with the Fe–Ni ANC@NSCA catalysts also shows a remarkable performance and exceptionally high stability over 500 h at 5 mA cm−2.

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Section: Resultsmentioning

confidence: 99%

Fe–Ni Alloy Nanoclusters Anchored on Carbon Aerogels as High‐Efficiency Oxygen Electrocatalysts in Rechargeable Zn–Air Batteries

Shu

Tong

et al. 2021

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“…In addition to compositional modification, optimizing structures with aid of other components could also boost the oxygen electrocatalytic performance of the PBA‐derived metal catalysts. Zhang and co‐workers [ 252 ] developed a combined chemical polymerization—spontaneous redox—pyrolysis approach to prepare ternary nitrogen precursor chitosan crosslinked poly(1,5‐diaminoanthraquinone)/Prussian blue (PDAA/PB) nanocomposite (Figure 19G). PDAA offered a homogenous aggregated wrinkle structure, which upon pyrolysis connected PB‐derived Fe nanoparticles and improved the charge conductivity (Figure 19H).…”

Section: Pyrolyzed Prussian Blue Analogs For Oxygen Electrocatalysismentioning

confidence: 99%

Metal–Organic Frameworks and Metal–Organic Gels for Oxygen Electrocatalysis: Structural and Compositional Considerations

2021

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Increasing demand for sustainable and clean energy is calling for the next‐generation energy conversion and storage technologies such as fuel cells, water electrolyzers, CO2/N2 reduction electrolyzers, metal–air batteries, etc. All these electrochemical processes involve oxygen electrocatalysis. Boosting the intrinsic activity and the active‐site density through rational design of metal–organic frameworks (MOFs) and metal–organic gels (MOGs) as precursors represents a new approach toward improving oxygen electrocatalysis efficiency. MOFs/MOGs afford a broad selection of combinations between metal nodes and organic linkers and are known to produce electrocatalysts with high surface areas, variable porosity, and excellent activity after pyrolysis. Some recent studies on MOFs/MOGs for oxygen electrocatalysis and their new perspectives in synthesis, characterization, and performance are discussed. New insights on the structural and compositional design in MOF/MOG‐derived oxygen electrocatalysts are summarized. Critical challenges and future research directions are also outlined.

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“…In the last years, the conversion of biomasses [25,[43][44][45][46][47][48][49][50] or waste polymers [42] into activated carbon has become a promising approach for the synthesis of self-templating M-N-C catalysts. In this paper, we present the synthesis and characterization of Fe-N x doped MCs by thermochemical conversion of a preconditioned hydrogel, prepared from a refined biomass, i.e., chitosan, without the use of any additional template or carbon black support.…”

Section: Introductionmentioning

confidence: 99%

Highly Graphitized Fe-N-C Electrocatalysts Prepared from Chitosan Hydrogel Frameworks

et al. 2021

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The development of platinum group metal-free (PGM-free) electrocatalysts derived from cheap and environmentally friendly biomasses for oxygen reduction reaction (ORR) is a topic of relevant interest, particularly from the point of view of sustainability. Fe-nitrogen-doped carbon materials (Fe-N-C) have attracted particular interest as alternative to Pt-based materials, due to the high activity and selectivity of Fe-Nx active sites, the high availability and good tolerance to poisoning. Recently, many studies focused on developing synthetic strategies, which could transform N-containing biomasses into N-doped carbons. In this paper, chitosan was employed as a suitable N-containing biomass for preparing Fe-N-C catalyst in virtue of its high N content (7.1%) and unique chemical structure. Moreover, the major application of chitosan is based on its ability to strongly coordinate metal ions, a precondition for the formation of Fe-Nx active sites. The synthesis of Fe-N-C consists in a double step thermochemical conversion of a dried chitosan hydrogel. In acidic aqueous solution, the preparation of physical cross-linked hydrogel allows to obtain sophisticated organization, which assure an optimal mesoporosity before and after the pyrolysis. After the second thermal treatment at 900 °C, a highly graphitized material was obtained, which has been fully characterized in terms of textural, morphological and chemical properties. RRDE technique was used for understanding the activity and the selectivity of the material versus the ORR in 0.5 M H2SO4 electrolyte. Special attention was put in the determination of the active site density according to nitrite electrochemical reduction measurements. It was clearly established that the catalytic activity expressed as half wave potential linearly scales with the number of Fe-Nx sites. It was also established that the addition of the iron precursor after the first pyrolysis step leads to an increased activity due to both an increased number of active sites and of a hierarchical structure, which improves the access to active sites. At the same time, the increased graphitization degree, and a reduced density of pyrrolic nitrogen groups are helpful to increase the selectivity toward the 4e- ORR pathway.

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Chitosan cross-linked poly(aminoanthraquinone)/Prussian blue ternary nitrogen precursor-derived Fe–N–C oxygen reduction catalysts for microbial fuel cells and zinc–air batteries

Abstract: A chitosan cross-linked poly(1,5-diaminoanthraquinone)/Prussian blue (PDAA/PB) ternary nitrogen precursor-derived Fe–N–C/800-HT2 catalyst shows highly efficient ORR activity for MFCs and Zn–air batteries.

Cited by 41 publications

References 54 publications

Fe–Ni Alloy Nanoclusters Anchored on Carbon Aerogels as High‐Efficiency Oxygen Electrocatalysts in Rechargeable Zn–Air Batteries

Fe–Ni Alloy Nanoclusters Anchored on Carbon Aerogels as High‐Efficiency Oxygen Electrocatalysts in Rechargeable Zn–Air Batteries

Metal–Organic Frameworks and Metal–Organic Gels for Oxygen Electrocatalysis: Structural and Compositional Considerations

Highly Graphitized Fe-N-C Electrocatalysts Prepared from Chitosan Hydrogel Frameworks

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