Nitrogen-doped hollow carbon spheres with highly graphitized mesoporous shell: Role of Fe for oxygen evolution reaction

Song, Min Young; Yang, Dae Soo; Singh, Kiran; Yuan, Jinliang; Yu, Jong-Sung

doi:10.1016/j.apcatb.2016.03.031

Cited by 85 publications

(47 citation statements)

References 54 publications

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“…This is largely due to the enhanced electrical conductivity of N‐doped carbon which aids in promoting charge transfer and eventually higher OER performance. Moreover, the rate determining step, i. e. the electrochemical adsorption of OH − , would be accelerated as the pyridinic N shares lone pairs of electrons with the adjacent carbon atom …”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the rate determining step, i. e. the electrochemical adsorption of OH À , would be accelerated as the pyridinic N shares lone pairs of electrons with the adjacent carbon atom. [25] In order to ascertain the optimal N-NiFe-S/C@CC, we prepared six samples with different n(Ni)/n(Fe) ratios. Original MOF (NiFe-MOF-8/2@CC) was also tested as comparison.…”

Section: Resultsmentioning

confidence: 99%

“…Another method to promote OER activity is through doping of heteroatom such as nitrogen into carbon matrix due to the synergistic effects between metal species and nitrogen dopants based on charge redistribution . In particular, graphitic N and pyridinic N have been shown to contribute positively towards OER performance .…”

Section: Introductionmentioning

confidence: 99%

“…[24] Another method to promote OER activity is through doping of heteroatom such as nitrogen into carbon matrix due to the synergistic effects between metal species and nitrogen dopants based on charge redistribution. [25] In particular, graphitic N and pyridinic N have been shown to contribute positively towards OER performance. [26] Due to its electron-withdrawing nature, pyridinic N is able to promote OH À , OOH À adsorption (which is considered the rate determining step in OER [27] ) due to its ability to accept electrons from adjacent carbon atoms (δ +).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Metal‐Organic‐Framework‐Derived Nitrogen‐Doped Hybrid Nickel‐Iron‐Sulfide Architectures on Carbon Cloth as Efficient Electrocatalysts for the Oxygen Evolution Reaction

et al. 2019

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Metal‐organic framework (MOF)‐derived nitrogen‐doped NiFe‐sulfides/carbon hybrid architectures were successfully constructed on carbon cloth (CC) with different n(Ni)/n(Fe) ratios through a simultaneous carbonization and sulfurization procedure from the corresponding bimetal NiFe‐based MOFs. The samples were directly utilized as the working electrodes for the oxygen evolution reaction (OER). The optimal sample N‐NiFe‐S/C‐8/2@CC possessed superior OER electrocatalytic activity with a remarkably low overpotential of 232 mV at a current density of 10 mA cm−2 in 1 M KOH aqueous solution. At the same time, a small Tafel slope of 58 mV dec−1 was achieved and excellent durability was also demonstrated. Such superior OER activity and durability of N‐NiFe‐S/C@CC may originate from a synergetic effect between Fe and Ni, the nitrogen‐doped carbon matrix derived from MOFs, and the direct growth of active materials on CC. This facile approach of preparing bimetal sulfide compounds derived from MOFs may be a viable method for designing and preparing high‐performing electrocatalytic materials for wider applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metal‐Organic‐Framework‐Derived Nitrogen‐Doped Hybrid Nickel‐Iron‐Sulfide Architectures on Carbon Cloth as Efficient Electrocatalysts for the Oxygen Evolution Reaction

et al. 2019

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“…Hollow structures are favorable to the mass diffusion during the catalytic process, which have been extensively applied in the supercapacitor, fuel cell and water splitting etc. [9,[174][175][176][177] Compared to 3D MÀ NÀ C NPs, 3D hollow structures have large hollow cavities, permeable shells, and uniform morphologies. [178] However, the volumetric activity of 3D hollow materials might be low in fuel cell testing.…”

Section: D Metal-nitrogen-carbon Materials For the Oxygen Reduction mentioning

confidence: 99%

Importance of Electrocatalyst Morphology for the Oxygen Reduction Reaction

2019

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Proton/anion‐exchange membrane fuel cells (PEMFC and AEMFC), generating electricity from the H2 energy with zero‐carbon emission, have become very promising energy conversion devices to meet the increasing energy demand and reduce the dependence on fossil fuels. Currently, platinum (Pt) based materials have proven to be the most efficient electrocatalysts for the oxygen reduction reaction (ORR) at the cathode of the PEMFC and AEMFC. However, the high price and the limited reserve of Pt greatly hinder their industrial applications. Recently, transition metal‐nitrogen‐carbon (M−N−C) based material, as an efficient alternative to replace the precious metal Pt‐based material, has attracted researchers’ attention. Great contributions have been devoted to develop M−N−C based electrocatalysts. This review summarizes recent advances on M−N−C based electrocatalysts used for ORR from the point view of morphology. One‐dimensional (1D), two‐dimensional (2D), three‐dimensional (3D) and multi‐dimensional (MD) M−N−C materials were discussed thoroughly with particular attention on the relationship between the structure and the catalytic activity.

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Gas Pickering Emulsion Templated Hollow Carbon for High Rate Performance Lithium Sulfur Batteries

Zhang

Wang

et al. 2016

Adv Funct Materials

103

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wileyonlinelibrary.comsulfur into the electrolyte, followed by its subsequent diffusion to the anode or more commonly known as the polysulfide (PS) shuttle effect. This causes unwanted side reactions ultimately resulting in poor cycle durability, low energy density, and low coulombic efficiency. [6b,7] A common strategy to mitigate the PS shuttle effect is to confine the PS within the cathode with host materials such as graphene foams, [8] various types of porous carbon, [6b,9] in addition to doped-carbon materials exhibiting PS adsorptive capabilities. [10] While LIS's stability and energy density is crucial, a high rate performance should be considered to be equally important and put under more scrutiny in the scientific community. In the case of electric vehicles (EV), the rate capability of the battery can influence the recharge time, acceleration, and regenerative braking efficiency. All of these parameters directly affect the final user experience of the vehicle and can cause serious damage to the reputation of EVs if poorly implemented. Often researchers have achieved LIS with impressive cycle durability, coulombic efficiency, and capacity, but do not fare well when subjected to higher rate performance tests. Indeed, a complex pore network will limit PS diffusion and provide enhanced durability, but the very same tortuous diffusion pathway out of the cathode will inevitably increase lithium ion diffusion resistance. When combined with the known electrolyte viscosity/resistance increase upon PS dissolution, [11] it is understandable as to why the rate performance is poor. Recent research into the rate performance of LIS revolves around providing efficient lithium ion and electron mass transfer pathways [12] or additional battery components such as an interlayer to provide additional surface area for faster PS reduction kinetics. [13] Interestingly, hollow structures, which have been previously used to successfully address the stability problems of LIS, commonly demonstrate excellent rate performances. [9,14] The distinct difference between hollow porous structures and regular porous carbon lies in the separation of the core electrolyte from the bulk electrolyte phases. The shell can act as a physical barrier to encapsulate PS, limiting dissolution of active sulfur material into the bulk electrolyte. More importantly, the hollow structures can serve as a electrolyte reservoir [15] to redirect PS diffusion inwards and reduce the PS concentration in the bulk electrolyte. This mitigates the effects of the PS dissolution induced viscosity increase. Accordingly, A CO 2 in water nanoparticle stabilized Pickering emulsion is used to template micrometer sized hollow porous nitrogen doped carbon particles for high rate performance lithium sulfur battery. For the first time, nanoparticles serve the dual role of an emulsion stabilizer and a pore template for the shell, directly utilizing in situ generated CO 2 bubbles as template for the core. The minimalistic nature of this method does not require expensive surfac...

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Nitrogen-doped hollow carbon spheres with highly graphitized mesoporous shell: Role of Fe for oxygen evolution reaction

Cited by 85 publications

References 54 publications

Metal‐Organic‐Framework‐Derived Nitrogen‐Doped Hybrid Nickel‐Iron‐Sulfide Architectures on Carbon Cloth as Efficient Electrocatalysts for the Oxygen Evolution Reaction

Metal‐Organic‐Framework‐Derived Nitrogen‐Doped Hybrid Nickel‐Iron‐Sulfide Architectures on Carbon Cloth as Efficient Electrocatalysts for the Oxygen Evolution Reaction

Importance of Electrocatalyst Morphology for the Oxygen Reduction Reaction

Gas Pickering Emulsion Templated Hollow Carbon for High Rate Performance Lithium Sulfur Batteries

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