Fine adjustment of catalyst agglomerate for the controllable construction of Co/Fe–N–C catalyst layers

Pei, Yabiao; Zhu, Weikang; Yue, Runfei; Yao, Jie; Liu, Xin; Wang, Lianqin; Zhang, Xiangwen; Yin, Yan; Guiver, Michael D.

doi:10.1016/j.jpowsour.2023.232904

Cited by 5 publications

(5 citation statements)

References 49 publications

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“…The varied pore structure and ionomer distribution within the CL formed under the solvent effects would influence the hydroxide ion conductivity and mass-transport properties of the CL and eventually affect the cell performance. 26,28,48 Solvent Effects on AEMFC Performance. We measured the performance of AEMFCs with cathodes made by using various ink solvents and correlated the results to their CL microstructures.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In this case, the ionomers connecting or covering these branched Pt/C structures distribute evenly as a thin but well-connected network without forming large aggregates. The varied pore structure and ionomer distribution within the CL formed under the solvent effects would influence the hydroxide ion conductivity and mass-transport properties of the CL and eventually affect the cell performance. ,, …”

Section: Resultsmentioning

confidence: 99%

“…All of these structure-determined factors contribute to the polarization behavior of the fuel cell. Therefore, well-designed CL microstructures are essential to high-performing AEMFCs. ,, However, systematic understanding and design of the CL microstructures for AEMFC is still rare and urgently needed …”

Section: Introductionmentioning

confidence: 99%

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Solvent Effects on the Catalyst Ink and Layer Microstructure for Anion Exchange Membrane Fuel Cells

Han,

Shi,

Huang

et al. 2024

ACS Appl. Mater. Interfaces

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Understanding the complex solvent effects on the microstructures of ink and catalyst layer (CL) is crucial for the development of high-performance anion exchange membrane fuel cells (AEMFCs). Herein, we study the solvent effects within the binary solvent ink system composed of water, isopropyl alcohol (IPA), commercial anion exchange ionomer, and Pt/C catalyst. The results show that the Pt/C particles and ionomer tend to form large aggregates wrapped with a thick ionomer layer in IPA-rich ink and promote the formation of large mesopores within the CL. With the increase of the water content in the ink, Pt/C particles are more likely to bridge to each other through wrapped FAA to form a well-connected three-dimensional network. The CL fabricated using water-rich ink shows smaller pores, higher porosity, and a more homogeneous ionomer network without the formation of large aggregates. Based on these results, we propose that the properties of the solvent mixture, including dielectric constant (ε) and solubility parameter (δ), affect the coulomb interaction of charged particles and surface tension at interfaces, which in turn affects the microstructure of ink and CL. By leveraging the solvent effects, we optimize the CL microstructures and improve the performance of AEMFC. These results may guide the rational design and fabrication of AEMFCs.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Solvent Effects on the Catalyst Ink and Layer Microstructure for Anion Exchange Membrane Fuel Cells

Han,

Shi,

Huang

et al. 2024

ACS Appl. Mater. Interfaces

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“…Increasing the Pt content may enhance the catalytic activity, though biological safety is compromised due to the cytotoxicity of Pt. Therefore, improving the atomic utilisation rate of Pt is crucial for enhancing the enzymatic activity of Pt NPs [ 15 , 16 ]. Research on single-atom (SA) nanozymes with a 100% atom utilisation rate, rich active sites, high selectivity, and perfect matching with natural enzymes can help provide novel insights into the construction of highly bioactive Pt NPs [ [17] , [18] , [19] , [20] ].…”

Section: Introductionmentioning

confidence: 99%

NIR-enhanced Pt single atom/g-C3N4 nanozymes as SOD/CAT mimics to rescue ATP energy crisis by regulating oxidative phosphorylation pathway for delaying osteoarthritis progression

Xiang,

Yang,

Tan

et al. 2024

Bioactive Materials

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“…Furthermore, this technique enables versatile introduction of different transition metals (TMs) and their compounds into CNFs, which have been confirmed to provide the active sites for ORR (e.g., TM-Nx) and OER (e.g., TM oxides) [ 8 , 9 , 13 , 14 ]. Despite the problems with uniform distribution of several TMs at once in one nanocarbon catalyst, multiple TM-containing materials have been proposed to be more efficient non-PGM bifunctional oxygen catalysts than single TM-based ones [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. In addition to dual TM-embedded CNF catalysts employed for RZAB air electrode application [ 23 , 24 , 25 ], triple TM combination with various nanocarbon supports have been also investigated [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Iron, Cobalt, and Nickel Phthalocyanine Tri-Doped Electrospun Carbon Nanofibre-Based Catalyst for Rechargeable Zinc–Air Battery Air Electrode

et al. 2023

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The goal of achieving the large-scale production of zero-emission vehicles by 2035 will create high expectations for electric vehicle (EV) development and availability. Currently, a major problem is the lack of suitable batteries and battery materials in large quantities. The rechargeable zinc–air battery (RZAB) is a promising energy-storage technology for EVs due to the environmental friendliness and low production cost. Herein, iron, cobalt, and nickel phthalocyanine tri-doped electrospun carbon nanofibre-based (FeCoNi-CNF) catalyst material is presented as an affordable and promising alternative to Pt-group metal (PGM)-based catalyst. The FeCoNi-CNF-coated glassy carbon electrode showed an oxygen reduction reaction/oxygen evolution reaction reversibility of 0.89 V in 0.1 M KOH solution. In RZAB, the maximum discharge power density (Pmax) of 120 mW cm−2 was obtained with FeCoNi-CNF, which is 86% of the Pmax measured with the PGM-based catalyst. Furthermore, during the RZAB charge–discharge cycling, the FeCoNi-CNF air electrode was found to be superior to the commercial PGM electrocatalyst in terms of operational durability and at least two times higher total life-time.

show abstract

Fine adjustment of catalyst agglomerate for the controllable construction of Co/Fe–N–C catalyst layers

Cited by 5 publications

References 49 publications

Solvent Effects on the Catalyst Ink and Layer Microstructure for Anion Exchange Membrane Fuel Cells

Solvent Effects on the Catalyst Ink and Layer Microstructure for Anion Exchange Membrane Fuel Cells

NIR-enhanced Pt single atom/g-C3N4 nanozymes as SOD/CAT mimics to rescue ATP energy crisis by regulating oxidative phosphorylation pathway for delaying osteoarthritis progression

Iron, Cobalt, and Nickel Phthalocyanine Tri-Doped Electrospun Carbon Nanofibre-Based Catalyst for Rechargeable Zinc–Air Battery Air Electrode

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