Nanoporous bimetallic Zn/Fe–N–C for efficient oxygen reduction in acidic and alkaline media

Xue, Jinling; Li, Yinshi; Hu, Jue

doi:10.1039/c9ta13471a

Cited by 100 publications

(60 citation statements)

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“…Moreover, the E onset and E 1/2 of Fe 55 ‐N−C are also higher than those of the reported Zn/Fe 3 ‐N−C catalyst derived from hemin doped ZIF‐8, as well as most other reported Fe‐based catalysts (Figure 5B, 5 C, and Table 1). [21a] Strikingly, an exceptionally high kinetic current density ( J k ) of 17.5 mA cm −2 at 0.850 V further shows superior activity of Fe 55 ‐N−C, which is significantly larger than the value of 5.3 mA cm −2 displayed on Pt/C and 3.1‐fold higher than that of Zn/Fe 2 ‐N−C (5.67 mA cm −2 ). All these results above demonstrate that Fe doping put a positive effect on the improvement of ORR catalytic performance.…”

Section: Resultsmentioning

confidence: 90%

“…This is owing to more Fe addition could be conducive to more highly dispersive of Fe‐N x active sites. However, as x rising to 85, the obtained Fe 85 ‐N−C shows slightly lower ORR catalytic activity compared with Fe 55 ‐N−C, which is associated with the decrease of active sites resulted from large amounts of defects in Hemin 85 @ZIF‐8 hybrid structure [21a] . What is more, the effects of different annealing temperatures (800, 900, and 1000 °C) and different heating time on the activity of Fe 55 ‐N−C are also investigated (Figure S10).…”

Section: Resultsmentioning

confidence: 90%

“…Notably, compared with N−C (871 m 2 g −1 ), the specific surface area of Fe 55 ‐N−C (1007 m 2 g −1 ) is markedly enhanced (Table S1). Nevertheless, N−C sample shows a higher total pore volume ( V total =0.82 cm 3 g −1 ) than that of Fe 55 ‐N−C (0.65 cm 3 g −1 ), suggesting the introduction of Fe may reduce the defect density in the ZIF‐8 derived structure [21a] . The pore size distribution by Barrett‐Joyner‐Halenda (BJH) adsorption exhibits dominant microporous structures in Fe 55 ‐N−C catalysts (Figure 3D).…”

Section: Resultsmentioning

confidence: 96%

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Iron‐Nitrogen Co‐doped Carbon with a Tunable Composition as Efficient Electrocatalysts for Oxygen Reduction

Zhang

et al. 2021

ChemElectroChem

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Understanding the relationship between composition and activity is essential for the rational design of metal-nitrogen-Carbon (MÀ NÀ C) electrocatalysts for the oxygen reduction reaction (ORR). Here, a series of Fe-N co-doped porous carbon (Fe-NÀ C) electrocatalysts are successfully prepared through the pyrolysis of ZIF-8 doped with different amount of hemin. The catalyst (Fe 55-NÀ C) exhibits impressive ORR performance with an onset potential (E onset) of 1.02 V (vs. RHE) and a half-wave potential (E 1/2) of 0.892 V in alkaline media, outperforming commercial Pt/C. Meanwhile, the average kinetic current density (J k) of Fe 55-NÀ C at 0.850 V is 17.5 mA cm À 2 , which is 3.3fold higher than that of commercial Pt/C. Besides, it also delivers anti-methanol poisoning ability and high durability. The high performance stems from the hierarchical porous structure, large specific surface area, and high dispersion of Fe-N x active sites in Fe 55-NÀ C. These findings could inspire new perspectives for rationally designing and synthesizing economical and practical non-precious-metal oxygen reduction electrocatalysts.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 96%

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Iron‐Nitrogen Co‐doped Carbon with a Tunable Composition as Efficient Electrocatalysts for Oxygen Reduction

Zhang

et al. 2021

ChemElectroChem

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“…[ 38 ] Hemin, as a natural organic iron with six coordinated porphyrin, can introduce iron while preventing Fe massive accumulation. [ 39,40 ]…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic, Kinetic, and Mechanism Insights into the Oxygen‐Reduction Catalyzed Based on the Biomass‐Derived FeO_x@N‐Doped Porous Carbon Composites

Lü

Chen

Wang

et al. 2021

Small

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A valid strategy for amplifying the oxygen reduction reaction (ORR) efficiency of non‐noble electrocatalyst in both alkaline and acid electrolytes by decorated with a layer of biomass derivative nitrogen‐doped carbon (NPC) is proposed. Herein, a top‐down strategy for the generally fabricating NPC matrix decorated with trace of metal oxides nanoparticles (FeOx NPs) by a dual‐template assisted high‐temperature pyrolysis process is reported. A high‐activity FeOx/FeNC (namely Hemin/NPC‐900) ORR electrocatalyst is prepared via simply carbonizing the admixture of Mg5(OH)2(CO3)4 and NaCl as dual‐templates, melamine and acorn shells as nitrogen and carbon source, hemin as a natural iron and nitrogen source, respectively. Owing to its unique 3D porous construction, large BET areas (819.1 m2∙g−1), and evenly dispersed active sites (FeNx, CN, and FeO parts), the optimized Hemin/NPC‐900 catalyst displays comparable ORR catalytic activities, remarkable survivability to methanol, and preferable long‐term stability in both alkali and acid electrolyte compared with benchmark Pt/C. More importantly, density function theory computations certify that the interaction between Fe3O4 nanoparticles and arm‐GN (graphitic N at armchair edge) active sites can effectually promote ORR electrocatalytic performance by a lower overpotential of 0.81 eV. Accordingly, the research provides some insight into design of low‐cost non‐precious metal ORR catalysts in theory and practice.

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Section: Commonly Used Zifs In Zn-air Batteriesmentioning

confidence: 99%

Advances in Zeolite Imidazolate Frameworks (ZIFs) Derived Bifunctional Oxygen Electrocatalysts and Their Application in Zinc–Air Batteries

Arafat

Azhar

Zhong

et al. 2021

Advanced Energy Materials

170

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The fast growth in human population and the quick cultural advancement of human society leads to the tremendous increase in energy demand. [1] During the past, fossil fuels were used as the main energy sources, while their excessive use based on the conventional combustion technology releases excessive greenhouse gases into the environment, causing adverse impact on the sustainability of ecosystem. To cope with the challenges of stringent environmental legislations and the reliance on fossil fuels, renewable Secondary Zn-air batteries (ZABs) are recognized as one of the most promising power sources for the future with lucrative features of low cost, high energy density, eco-friendliness, and high safety. However, the widespread implementation of ZABs is still hampered by the sluggish oxygen redox reactions. Thus the deployment of cost-effective and highly efficient air electrodes to substitute precious metals (Pt/Ir), is highly challenging, however, highly desired. Zeolitic imidazolate frameworks (ZIFs) are emerging functional materials, which demonstrate several outstanding characteristics, such as high specific surface area, high conductivity, self-doped N, open pore structure, versatile compositions and favourable chemical stability. Through varying the metal/organic moiety or by employing different synthesis protocols, ZIFs with different properties could be obtained. Being adaptable, desired functionalities may be further incorporated into ZIFs through pre-treatment, in situ treatment, and post treatment. Thus, ZIFs are the ideal precursors for the preparation of variety of bi-functional air electrodes for ZABs by materials tuning, morphological control, or by materials hybridization. Here, the recent advances of ZIFs-based materials are critically surveyed from the perspective of synthesis, morphology, structure and properties, and correlated with performance indicators of ZABs. Finally, the major challenges and future prospects of ZIFs associated with ZABs are discussed.

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Nanoporous bimetallic Zn/Fe–N–C for efficient oxygen reduction in acidic and alkaline media

Abstract: ZIF-derived nanoporous bimetallic Zn/Fe–N–C exhibits high half-wave potentials in acidic (0.81 V vs. RHE) and alkaline (0.86 V vs. RHE) media, which are comparable to those of the commercial Pt/C catalyst and ranks among the top reported electrocatalysts.

Cited by 100 publications

References 55 publications

Iron‐Nitrogen Co‐doped Carbon with a Tunable Composition as Efficient Electrocatalysts for Oxygen Reduction

Iron‐Nitrogen Co‐doped Carbon with a Tunable Composition as Efficient Electrocatalysts for Oxygen Reduction

Electrocatalytic, Kinetic, and Mechanism Insights into the Oxygen‐Reduction Catalyzed Based on the Biomass‐Derived FeO_x@N‐Doped Porous Carbon Composites

Advances in Zeolite Imidazolate Frameworks (ZIFs) Derived Bifunctional Oxygen Electrocatalysts and Their Application in Zinc–Air Batteries

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Nanoporous bimetallic Zn/Fe–N–C for efficient oxygen reduction in acidic and alkaline media

Abstract: ZIF-derived nanoporous bimetallic Zn/Fe–N–C exhibits high half-wave potentials in acidic (0.81 V vs. RHE) and alkaline (0.86 V vs. RHE) media, which are comparable to those of the commercial Pt/C catalyst and ranks among the top reported electrocatalysts.

Cited by 100 publications

References 55 publications

Iron‐Nitrogen Co‐doped Carbon with a Tunable Composition as Efficient Electrocatalysts for Oxygen Reduction

Iron‐Nitrogen Co‐doped Carbon with a Tunable Composition as Efficient Electrocatalysts for Oxygen Reduction

Electrocatalytic, Kinetic, and Mechanism Insights into the Oxygen‐Reduction Catalyzed Based on the Biomass‐Derived FeOx@N‐Doped Porous Carbon Composites

Advances in Zeolite Imidazolate Frameworks (ZIFs) Derived Bifunctional Oxygen Electrocatalysts and Their Application in Zinc–Air Batteries

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Electrocatalytic, Kinetic, and Mechanism Insights into the Oxygen‐Reduction Catalyzed Based on the Biomass‐Derived FeO_x@N‐Doped Porous Carbon Composites