Improved Electrocatalytic Performance of Tailored Metal‐Free Nitrogen‐Doped Ordered Mesoporous Carbons for the Oxygen Reduction Reaction

Zhong, Haihong; Zhang, Shuwei; Jiang, Jiawei; Li, Dianqing; Tang, Pinggui; Alonso‐Vante, Nicolas; Feng, Yongjun

doi:10.1002/celc.201700910

Cited by 17 publications

(12 citation statements)

References 42 publications

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“…The peak assignments and relative abundances are labeled in that diagram and are based on recent XPS literature. − The peaks at 288.7 and 290.6 eV in Figure E are assigned to C–O and CO, respectively. Slight increases in these peaks for N′-GUITAR/KB as shown in Figure B can be attributed to CN and C–N from the doping process . The sp 2 /sp 3 (85/15%) ratio in Figure B,E is in agreement with a previous study on GUITAR …”

Section: Resultssupporting

confidence: 91%

“…Figure A shows an N abundance of 0.9% in N′-GUITAR/KB. In the literature, N-doped carbon materials typically range from 1.2 to 11.3 atomic %. ,,,,,− The N′-GUITAR/KB XPS indicates the presence of pyridinic (398.2 eV), pyrrolic (400.4 eV), and N-oxides (404.3 eV) (see Figure C); however, graphitic nitrogen (401.5 eV) is notably absent. It is unusual to find such selectively nitrogen-doped carbon materials in the literature.…”

Section: Resultsmentioning

confidence: 99%

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Highly Stable, Low-Cost Metal-Free Oxygen Reduction Reaction Electrocatalyst Based on Nitrogen-Doped Pseudo-Graphite

et al. 2021

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There have been many advancements in the search for an oxygen reduction reaction (ORR) catalyst that exhibits strong performance and exceptional durability using low-cost materials. Although recent advancements have focused on matching or surpassing the ORR performance of Pt/C, exploring ways to improve the durability of electrocatalysts on longer time scales has not been adequately addressed. In this work, a high-performance and stable ORR electrocatalyst was produced using a simple nitrogen-doping protocol on GUITAR (pseudo-Graphite from the University of Idaho Thermolyzed Asphalt Reaction)-coated Ketjen black (N′-GUITAR/KB). X-ray photoelectron spectroscopy indicates selective doping of pyridinic and pyrrolic moieties (total N abundance of 0.9%). Voltammetric experiments in O2-saturated 0.1 M KOH indicate that the electrocatalyst is exceptionally stable and one of the highest performers regarding overvoltage and current density. The system maintained its electrocatalytic performance throughout the Department of Energy stress protocol, which consists of 30,000 convective cyclic voltammetry cycles in O2-saturated 0.1 M KOH. This remarkable stability, along with the low-cost synthesis, represents an important milestone in overcoming the challenges that prevent wide-scale adoption of fuel cell technology.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Highly Stable, Low-Cost Metal-Free Oxygen Reduction Reaction Electrocatalyst Based on Nitrogen-Doped Pseudo-Graphite

et al. 2021

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“…grade and were directly used as received from Beijing Chemical Co. Ltd (Beijing, China). CMK-3 was synthesized as reported previously [20].…”

Section: Chemicalsmentioning

confidence: 99%

“…In addition, the doping heteroatom, such as nitrogen [14,15], phosphor [16,17], sulfur [18] and boron [19], can further improve electrocatalytic performance towards oxygen electrode reactions due to new active species. In a previous report, we developed N-doped ordered mesoporous carbons (CMK-3) with high ORR activity, long stability, and outstanding methanol tolerance in 0.1 M KOH [20]. Therefore, it is possible to explore high-performance, low-cost electrocatalysts using N-doped ordered mesoporous carbon as a substrate to support cobalt-based chalcogenides.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-Doped Ordered Mesoporous Carbons Supported Co3O4 Composite as a Bifunctional Oxygen Electrode Catalyst

et al. 2019

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It is increasingly useful to develop bifunctional catalysts for oxygen reduction and oxygen evolution reaction (ORR and OER) for fuel cells, metal-air rechargeable batteries, and unitized regenerative cells. Here, based on the excellent conductivity and stability of ordered mesoporous carbons, and the best ORR and OER activity of Co3O4, the composite Co3O4/N-HNMK-3 was designed and manufactured by means of a solvothermal method, using ordered N-doped mesoporous carbon (N-HNMK-3) as substrate, and then the bifunctional electrocatalytic performance corresponding to ORR, OER in alkaline media was carefully investigated. The results showed that Co3O4/N-HNMK-3 composite, a non-precious metal centered electrocatalyst, displayed excellent ORR performance (activity, selectivity, and stability) close to that of commercial 20 wt.% Pt/C and a promising OER activity near 20 wt.% RuO2/C. The outstanding bifunctional activities of Co3O4/N-HNMK-3 was assessed with the lowest △E value of 0.86 V (EOER,10 mA cm−2-EORR,−3 mA cm−2) with respect to the two commercial precious metal-based electrocatalysts.

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“…The following inorganic silica templates are generally used for producing OMCs, such as SBA‐1, SBA‐15, SBA‐16, KIT‐5, KIT‐6, MCM‐41, MCM‐48 and MCM‐50 . Among these, SBA‐15 silica template possesses hexagonal arrangement (p6 mm), with high BET surface area (690‐920 m 2 /g), uniform pores size (2‐50 nm) and low wall thickness (3.1‐5.3 nm). Such type of wall thickness present in supports helps to improve the thermal and mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Template Etching Process of SBA‐15 Derived Ordered Mesoporous Carbon on Electrocatalytic Oxygen Reduction Reaction

et al. 2019

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Ordered mesoporous carbon (OMC) is a promising material for oxygen reduction reaction (ORR) in fuel cells owing to its high surface area and more number of catalytic active sites. Herein, OMC was synthesized by hard template method, i. e., nanocasting of sacrificial silica template (SBA-15) and then the sacrificial template was abolished using three different etching chemicals namely, hydrofluoric acid (HF), sodium hydroxide (NaOH) and polyvinylidene fluoride (PVDF) respectively, in order to study the etching effect. The etched OMCs derived from the SBA-15 template was confirmed by various characterization techniques. In OMC, the porous nature, surface morphology and defect density changes with respect to etching chemicals were evidently determined. From the electrochemical studies, it has been concluded that the NaOH etched OMC showed higher electrocatalytic activity than others by exhibiting more positive onset (0.83 V), half-wave potential (0.75 V), high current density (3.3 mA/cm 2 ), Tafel slope (83 mV/ dec) and n-value (2.4). Eventually, the electrochemical impedance study (EIS) was performed to determine the charge transfer resistance (R ct ) of various etched OMCs and has been found that NaOH etched OMC shows the lowest R ct value due to the presence of more defective sites and result in enhancing oxygen adsorption during ORR.[a] V.

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Improved Electrocatalytic Performance of Tailored Metal‐Free Nitrogen‐Doped Ordered Mesoporous Carbons for the Oxygen Reduction Reaction

Cited by 17 publications

References 42 publications

Highly Stable, Low-Cost Metal-Free Oxygen Reduction Reaction Electrocatalyst Based on Nitrogen-Doped Pseudo-Graphite

Highly Stable, Low-Cost Metal-Free Oxygen Reduction Reaction Electrocatalyst Based on Nitrogen-Doped Pseudo-Graphite

Nitrogen-Doped Ordered Mesoporous Carbons Supported Co3O4 Composite as a Bifunctional Oxygen Electrode Catalyst

Investigation on Template Etching Process of SBA‐15 Derived Ordered Mesoporous Carbon on Electrocatalytic Oxygen Reduction Reaction

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