Nitrogen-modified metal-organic framework-based carbon: An effective non-precious electrocatalyst for oxygen reduction reaction

Tan, Ting; Tao, Pengyu; Li, Xiang; Imhanria, Sarah; Deng, Jie; Wang, Wei

doi:10.1016/j.catcom.2020.106135

Cited by 12 publications

(6 citation statements)

References 26 publications

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“…In recent years, there has been an increase in the use of MOFs as sacrificial templates or precursors to produce porous materials . Primarily, various metal oxides and sulfides obtained from MOFs have been presented as notable electrocatalysts. − The electrocatalysts derived from the pyrolysis of MOFs have a specific feature of a large surface area, which is responsible for the increased exposure of the active sites and enables the fast charge and mass transport. , …”

Section: Introductionmentioning

confidence: 99%

Co₉S₈ Nanoparticles for Hydrogen Evolution

Mujtaba

Zhu

et al. 2021

ACS Appl. Nano Mater.

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The exploration of electrocatalysts for hydrogen evolution, that are stable and efficient in both acidic and alkaline media, is of the momentous importance in the advancement of clean energy production. This paper describes a modest, low-cost, and feasible method to synthesize hierarchical structures of Co 9 S 8 nanoparticles cocooned in the N-doped carbon layer (Co 9 S 8 -NDCL). First, the metal−organic framework, zeolitic imidazolate framework-67, was synthesized and then morphed into Co 9 S 8 -NDCL nanocomposites by thermal treatment with sulfur powder in an argon environment. The nanocomposite electrocatalyst boosts the efficient functioning in acidic (0.5 M sulfuric acid, H 2 SO 4 , pH = 0) and basic (1 M potassium hydroxide, KOH, pH = 14) conditions toward the hydrogen evolution reaction (HER). The improved electrocatalytic activity can be ascribed to the hierarchical, porous structure and synergy of Co 9 S 8 nanoparticles and the N-doped carbon layer. The Co 9 S 8 -NDCL nanocomposite electrode attains the current density of 20 mA.cm −2 for the HER, requiring very low overpotentials of 149 and 219 mV in 0.5 M H 2 SO 4 and 1 M KOH aqueous solutions, respectively. It is also observed that the Co 9 S 8 -NDCL nanocomposites, even after 2000 cycles, exhibited good stability and a small Tafel slope in both media. This study presents a mark in the race of achieving low-cost and highly efficient pristine Co 9 S 8 nanocomposites without doping of any precious metals.

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Section: Introductionmentioning

confidence: 99%

Co₉S₈ Nanoparticles for Hydrogen Evolution

Mujtaba

Zhu

et al. 2021

ACS Appl. Nano Mater.

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“…It is well known that the carbonization process facilitates the vanish of defects in GNs and thus decrease the doping sites for N atoms, which is responsible for the decreased N content of the NGNs with the increased annealing temperature. Comparisons of the N‐loading content between NGNs‐900 and previously reported carbon‐based ORR electrocatalysts are shown in Figure 4c [15,33–38] . It indicates that the NGNs‐900 possessed apparently higher N content.…”

Section: Resultsmentioning

confidence: 75%

“…Comparisons of the N-loading content between NGNs-900 and previously reported carbon-based ORR electrocatalysts are shown in Fig- ure 4c. [15,[33][34][35][36][37][38] It indicates that the NGNs-900 possessed apparently higher N content. It is well known that graphitic-N and pyridinic-N sites are catalytically active to ORR.…”

Section: Resultsmentioning

confidence: 99%

Edge‐Rich Graphene Nanospheres with Ultra‐High Nitrogen Loading Metal‐Free Electrocatalysts for Boosted Oxygen Reduction

et al. 2022

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Nitrogen (N) doping in graphene‐based materials has been demonstrated as an effective strategy in constructing active sites of metal‐free catalysts for oxygen reduction reaction (ORR). The practical applications of metal‐free electrocatalysts in metal‐air batteries or fuel cells, nevertheless, have been hampered by their unsatisfactory catalytic performance due to insufficient catalytic active sites. In this work, a novel N‐rich graphene nanospheres (NGNs) have been achieved by adopting an edge engineering strategy through annealing the mixture of graphitic carbon nitride (g‐C3N4) and edge‐rich graphene nanospheres (GNs) composed of graphene nanoflakes. Benefiting from the exposure of edge defects in the GNs, the N loading surprisingly achieved as high as 14.01 at%. The half‐wave potential and limiting current density of the synthesized NGNs‐900 catalyst can reach 0.872 V and 4.25 mA cm−2, respectively, which are superior to that of the commercial Pt/C. Based on the experimental and theoretical results, the synergistic effect of graphitic‐N and pyridinic‐N in NGNs catalysts has been distinguished as the origin of the boosted ORR performance. This work proposes a facile synthesis strategy to optimize the N‐doped carbon‐based catalysts for ORR, which have great potential to replace noble‐metal catalysts.

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“…[3][4] Nowadays, noble metals of such Pt-based matrix are reported to be the most efficient commercial ORR/ HER catalysts while Ir/Ru-based matrix is the ideal commercial OER electrocatalysts, due to their outstanding electrocatalytic activities and working stabilities. [5][6] However, the main drawbacks of them including high costs, raw material scarcity, and poor stability restrict their large-scale productions, [7][8] making it utmost urgency to exploring other potential alternatives.Synergetic contributions from the hybrid carbonous (etc., graphene, [9] carbon nanotubes (CNTs), [10] and polypyrrole [11] ) electrocatalysts had been demonstrated as the most promising strategy, [12][13] due to its satisfactory electron conduction, good catalytic activities, and also the exposed active sites. [14][15][16] For example, porous rGO-Co 5.47 N electrocatalysts [17] was demonstrated with high half-wave potential and excellent cycling stabilities; and B, N-doped carbon nanotube is used to disperse atomically Co sites to significantly improve ORR properties [18] Zou et al [19] reported the 2D Fe/Co and N/B Co-doped mesoporous carbon nanosheets (FeCo/NB-Cs) that were synthesized to strategically boost kinetics of oxygen reduction/evolution reaction (ORR/OER).…”

mentioning

confidence: 99%

“…Synergetic contributions from the hybrid carbonous (etc., graphene, [9] carbon nanotubes (CNTs), [10] and polypyrrole [11] ) electrocatalysts had been demonstrated as the most promising strategy, [12][13] due to its satisfactory electron conduction, good catalytic activities, and also the exposed active sites. [14][15][16] For example, porous rGO-Co 5.47 N electrocatalysts [17] was demonstrated with high half-wave potential and excellent cycling stabilities; and B, N-doped carbon nanotube is used to disperse atomically Co sites to significantly improve ORR properties [18] Zou et al [19] reported the 2D Fe/Co and N/B Co-doped mesoporous carbon nanosheets (FeCo/NB-Cs) that were synthesized to strategically boost kinetics of oxygen reduction/evolution reaction (ORR/OER).…”

mentioning

confidence: 99%

Processing Agricultural Cornstalks toward High‐Efficient Stable Bifunctional ORR/OER Electrocatalysts

Chao-cheng

Cui

et al. 2021

Advanced Sustainable Systems

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Reaction (ORR) are two crucial reactions for cathode materials, playing a significant role in emerging electrochemical energy technologies. [3][4] Nowadays, noble metals of such Pt-based matrix are reported to be the most efficient commercial ORR/ HER catalysts while Ir/Ru-based matrix is the ideal commercial OER electrocatalysts, due to their outstanding electrocatalytic activities and working stabilities. [5][6] However, the main drawbacks of them including high costs, raw material scarcity, and poor stability restrict their large-scale productions, [7][8] making it utmost urgency to exploring other potential alternatives.Synergetic contributions from the hybrid carbonous (etc., graphene, [9] carbon nanotubes (CNTs), [10] and polypyrrole [11] ) electrocatalysts had been demonstrated as the most promising strategy, [12][13] due to its satisfactory electron conduction, good catalytic activities, and also the exposed active sites. [14][15][16] For example, porous rGO-Co 5.47 N electrocatalysts [17] was demonstrated with high half-wave potential and excellent cycling stabilities; and B, N-doped carbon nanotube is used to disperse atomically Co sites to significantly improve ORR properties [18] Zou et al. [19] reported the 2D Fe/Co and N/B Co-doped mesoporous carbon nanosheets (FeCo/NB-Cs) that were synthesized to strategically boost kinetics of oxygen reduction/evolution reaction (ORR/OER). Although the resulting ORR or/and OER electrocatalyst activities are satisfactory, there is still under debate on their practical applications due to the disadvantages of Bifunctional oxygen reduction/oxidation reaction (ORR/OER) electrocatalysts derived from biomass are one of the most valuable materials in terms of sustainability, ecological economy and industrial manufacturing, and are emerging as a desired alternative to the commercial Pt/C and IrO 2 catalysts. This work demonstrates the processing of agricultural cornstalk waste of cornstalks into stable bifunctional ORR/OER catalysts with high-performance by a simple and costeffective strategy. Rich hydrophilic active groups (e.g., hydroxyl groups) in the hierarchical porous structures of the native cornstalks enable the sufficient facile combination with transition metals (e.g., Co, Fe, Zn) and heteroatoms (e.g., B, N) from soluble Co(NO 3 ) 2 , ZnCl 2 , H 3 BO 3 , NH 4 Cl in a hydrothermal reaction. The pyrolytic evaporation of Zn 2+ in a high-temperature carbonization process facilitates the generation of abundant micropores and mesopores to increase specific surface areas (941.44 m 2 g −1 ) and also hinders aggregation between neighboring transition metals. The synergistic effects of N, B, Fe and Co doping in hierarchical porous biochar-structures contributes to outstanding bifunctional ORR/OER activities and working stabilities, outperforming commercial Pt/C and IrO 2 catalysts. Computational results further verify the valuable synergistic contributions based on density-functional theory (DFT). This approach opens up a new possibility for the fabrication of bifunction...

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Nitrogen-modified metal-organic framework-based carbon: An effective non-precious electrocatalyst for oxygen reduction reaction

Cited by 12 publications

References 26 publications

Co₉S₈ Nanoparticles for Hydrogen Evolution

Co₉S₈ Nanoparticles for Hydrogen Evolution

Edge‐Rich Graphene Nanospheres with Ultra‐High Nitrogen Loading Metal‐Free Electrocatalysts for Boosted Oxygen Reduction

Processing Agricultural Cornstalks toward High‐Efficient Stable Bifunctional ORR/OER Electrocatalysts

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Nitrogen-modified metal-organic framework-based carbon: An effective non-precious electrocatalyst for oxygen reduction reaction

Cited by 12 publications

References 26 publications

Co9S8 Nanoparticles for Hydrogen Evolution

Co9S8 Nanoparticles for Hydrogen Evolution

Edge‐Rich Graphene Nanospheres with Ultra‐High Nitrogen Loading Metal‐Free Electrocatalysts for Boosted Oxygen Reduction

Processing Agricultural Cornstalks toward High‐Efficient Stable Bifunctional ORR/OER Electrocatalysts

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Co₉S₈ Nanoparticles for Hydrogen Evolution

Co₉S₈ Nanoparticles for Hydrogen Evolution