Nitrogen-doped hollow mesoporous carbon spheres as a highly active and stable metal-free electrocatalyst for oxygen reduction

Zhou, Tingsheng; Zhou, Yao; Ma, Ruguang; Zhou, Zhenhua; Liu, Guanghui; Liu, Qian; Zhu, Yufang; Wang, Jiacheng

doi:10.1016/j.carbon.2016.12.011

Cited by 123 publications

(57 citation statements)

References 65 publications

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“…Additionally, the diffraction peaks at 43° of the two samples indicate the low degree of graphitization. In addition to the diffraction peaks at 23.5° and 43°, no other peaks of crystalline phases, such as metallic Fe (≈45° and 65°), Fe 3 C (43.7°), and Fe 4 N (≈33 o ), are detected in the XRD pattern of Fe/N‐G (curve a), which further confirms the absence of metallic iron crystalline, Fe 3 C, and Fe 4 N in Fe/N‐G.…”

Section: Resultssupporting

confidence: 57%

Vertical‐Space‐Limit Synthesis of Bifunctional Fe, N‐Codoped 2D Multilayer Graphene Electrocatalysts for Zn‐Air Battery

et al. 2019

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Developing a green, cost‐efficient air‐cathode catalyst with high oxygen evolution and reduction reaction (OER/ORR) performance for rechargeable Zn‐air batteries (ZABs) has gained attention. Iron‐containing nitrogen‐doped graphene (Fe/N‐G) that contains Fe‐Nx coordination sites is prepared by pyrolyzing the complex of iron ion and PANI sheets intercalated with the unique layer gaps of H‐montmorillonite nanoreactors. The transmission electron microscopy (TEM), X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy (XPS) analysis confirm that there are no crystalline materials, such as iron lattice, iron carbide, or iron nitride. The as‐prepared Fe/N‐G show a high electrocatalytic activity in ORR with a 4e− transfer process and the half‐wave potential of Fe/N‐G (0.877 V vs reversible hydrogen electrode—RHE), which is better than that of Pt/C in oxygen saturated 0.1 m KOH solution. In an acid electrolyte, the Fe/N‐G possesses a half‐wave potential similar to that of 20 wt% Pt/C. For OER, the Fe/N‐G exhibits the overpotential of 400 mV versus RHE at 10 mA cm−2. However, the Fe/N‐G as the air‐cathode of the homemade rechargeable ZABs exhibits a high power density (156.8 mW cm−2) and an excellent long discharge–charge cycling stability (787 cycles) at 20 mA cm−2. This work provides an inspiring guideline to prepare a high‐performance bifunctional air‐cathode for a rechargeable ZAB.

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Section: Resultssupporting

confidence: 57%

Vertical‐Space‐Limit Synthesis of Bifunctional Fe, N‐Codoped 2D Multilayer Graphene Electrocatalysts for Zn‐Air Battery

et al. 2019

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“…In addition, the productivity of HO 2 À and the n were determined based on the data obtained with the RRDE. The calculation formula is as follows: [41] HO 2 À ð%Þ¼200IR=ðNI D þ I R Þð 4Þ…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Yang

et al. 2020

Chemistry A European J

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The development of cost‐effective and durable oxygen electrocatalysts remains highly critical but challenging for energy conversion and storage devices. Herein, a novel FeNi alloy nanoparticle core encapsulated in carbon shells supported on a N‐enriched graphene‐like carbon matrix (denoted as FeNi@C/NG) was constructed by facile pyrolyzing the mixture of metal salts, glucose, and dicyandiamide. The in situ pyrolysis of dicyandiamide in the presence of glucose plays a significant effect on the fabrication of the porous FeNi@C/NG with a high content of doped N and large specific surface area. The optimized FeNi@C/NG catalyst displays not only a superior catalytic performance for the oxygen reduction reaction (ORR, with an onset potential of 1.0 V and half‐wave potential of 0.84 V) and oxygen evolution reaction (OER, the potential at 10 mA cm−2 is 1.66 V) simultaneously in alkaline, but also outstanding long‐term cycling durability. The excellent bifunctional ORR/OER electrocatalytic performance is ascribed to the synergism of the carbon shell and FeNi alloy core together with the high‐content of nitrogen doped on the large specific surface area graphene‐like carbon.

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“…Alien nitrogen atom doped into the graphitic framework changes electronic density of carbon surface and thus favors the oxygen molecule adsorption and further reduction ,. Despite of the high activity of N‐doped carbons, their performances are still far from satisfactory ,,. This is mainly because of their relatively low exposed nitrogen contents, low surface utilization, and unfavorable mass‐transferring ability.…”

Section: Introductionmentioning

confidence: 99%

Biomass Derived Graphene‐Like Carbons for Electrocatalytic Oxygen Reduction Reaction

et al. 2019

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Two‐dimensional carbons synthesis through sustainable bio‐manufacturing methods has attracted much attention in the past decade. This process facilitates low cost and facile manufacturing of porous carbon materials with specific characteristics, as well as chemical functions that differ from their bulk counterparts due to the low dimensionality. Herein, a unique graphene‐like carbon framework composed of three‐dimensionally interconnected nanosheets has been successfully fabricated via carbonization of a biomass precursor guanine and colloidal silica. The obtained two‐dimensional carbon materials, consisting of carbon nanosheets with varying sizes, can provide huge exposed areas. Owing to the merits of in situ nitrogen‐doping, particularly the optimization of nitrogen species and significant improvement in porosity, the sample GHS‐1000‐2.5 delivers the outstanding electrochemical activity towards oxygen reduction reaction in both acid and alkaline conditions, which are comparable to the commercial Pt/C catalyst and show even better performance under the same conditions. This highly efficient, facile and low‐cost strategy is expected to meet the requirements for the commercialization for fuel cells.

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Nitrogen-doped hollow mesoporous carbon spheres as a highly active and stable metal-free electrocatalyst for oxygen reduction

Cited by 123 publications

References 65 publications

Vertical‐Space‐Limit Synthesis of Bifunctional Fe, N‐Codoped 2D Multilayer Graphene Electrocatalysts for Zn‐Air Battery

Vertical‐Space‐Limit Synthesis of Bifunctional Fe, N‐Codoped 2D Multilayer Graphene Electrocatalysts for Zn‐Air Battery

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Biomass Derived Graphene‐Like Carbons for Electrocatalytic Oxygen Reduction Reaction

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