Fe/N/S-doped mesoporous carbon nanostructures as electrocatalysts for oxygen reduction reaction in acid medium

Kwak, Da-Hee; Han, Sang-Beom; Lee, Young-Woo; Park, Hyun-Suk; Choi, In-Ae; Ma, Kyeng-Bae; Kim, Min‐Cheol; Kim, Si-Jin; Kim, Do-Hyoung; Sohn, Jung-Inn; Park, Kyung-Won

doi:10.1016/j.apcatb.2016.10.084

Cited by 180 publications

(70 citation statements)

References 112 publications

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“…Accordingly, to maximize the electrocatalytic activity and improve durability in wide pH condition, hybrids of transition metal or compound with conductive heteroatoms (N, S, B, etc.) doped nanocarbons have been developed . For instance, the Fe–N–C hybrid electrocatalysts are demonstrated to hold the most impressive activity toward ORR in base and acid electrolytes .…”

Section: Introductionmentioning

confidence: 99%

Fe Vacancies Induced Surface FeO₆ in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction

Huang

et al. 2018

Adv Funct Materials

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Developing high-active, good-stable, and cost-effective electrocatalyst for oxygen reduction reaction (ORR) in all-pH medium is highly desired for the application of various fuel cell systems. Here, a network architecture hybrid with porous nitrogen-doped graphene encapsulated β-FeOOH nanoparticals (β-FeOOH/PNGNs) as ORR electrocatalyst, which exhibits remarkable enhancement ORR performance in terms of activity and stability in pHuniversal medium is reported. Systematic characterization combining with X-ray absorption fine structure analysis and the first principles simulations reveal that the as-formed surface FeO 6 active sites that induced by a mass of Fe vacancies in β-FeOOH/PNGNs can significantly lower the thermodynamic barrier of the total reaction, and hence contribute to a remarkable enhancement in ORR activity.

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Section: Introductionmentioning

confidence: 99%

Fe Vacancies Induced Surface FeO₆ in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction

Huang

et al. 2018

Adv Funct Materials

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“…[1] Forexample,S-doped Fe/N/C catalysts exhibit better ORR activity than undoped Fe/N/C in acidic electrolyte. [11] Thee nhanced ORR properties have been ascribed to iron-containing active sites surrounded by sulfur species; [12] however, the precise role of sulfur during the ORR is still unclear. Herein, we designed an ovel S-doped Fe/N/C catalyst by atemplate casting procedure (see the Supporting, Scheme S1).…”

mentioning

confidence: 99%

Synergistic Effects between Atomically Dispersed Fe−N−C and C−S−C for the Oxygen Reduction Reaction in Acidic Media

et al. 2017

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Various advanced catalysts based on sulfur-doped Fe/N/C materials have recently been designed for the oxygen reduction reaction (ORR); however, the enhanced activity is still controversial and usually attributed to differences in the surface area, improved conductivity, or uncertain synergistic effects. Herein, a sulfur-doped Fe/N/C catalyst (denoted as Fe/SNC) was obtained by a template-sacrificing method. The incorporated sulfur gives a thiophene-like structure (C-S-C), reduces the electron localization around the Fe centers, improves the interaction with oxygenated species, and therefore facilitates the complete 4 e ORR in acidic solution. Owing to these synergistic effects, the Fe/SNC catalyst exhibits much better ORR activity than the sulfur-free variant (Fe/NC) in 0.5 m H SO .

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“…[24] However,m ost of the non-preciousc atalysts present poorer catalytic activity in acidm edia than in alkaline electrolyteb ecause of lowreactionkinetics. [24] However,m ost of the non-preciousc atalysts present poorer catalytic activity in acidm edia than in alkaline electrolyteb ecause of lowreactionkinetics.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to alkaline electrolyte, we also measuredt he electrocatalytic performance for ORR in O 2 -saturated 0.5 m H 2 SO 4 ,c onsidering the proton-exchange membrane fuel cells (PEMFC)o perated with acid electrolyte that show high energyconversion efficiency,e co-friendliness, and low operating temperatures. [24] However,m ost of the non-preciousc atalysts present poorer catalytic activity in acidm edia than in alkaline electrolyteb ecause of lowreactionkinetics. As shown in Figure 4a, CoÀP/CoÀNÀC/NPC presents the highest E 1/2 (0.7 V) compared with PC, CoÀP/PC, and CoÀN/NC, indicating the best catalytic performance for ORR in 0.5 m H 2 SO 4 with the exception of the reference Pt/C.…”

Section: Resultsmentioning

confidence: 99%

Cobalt–Tannin‐Framework‐Derived Amorphous Co−P/Co−N−C on N, P Co‐Doped Porous Carbon with Abundant Active Moieties for Efficient Oxygen Reactions and Water Splitting

et al. 2019

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It remains a tremendous challenge to develop a low‐cost, earth‐abundant, and efficient catalyst with multifunctional activities for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). Herein, a facile and scalable avenue was developed to prepare amorphous Co−P/Co−N−C supported on N, P co‐doped porous carbon (Co−P/Co−N−C/NPC) with a large specific surface area (1462.9 m2 g−1) and abundant reactive sites including Co−P, Co−N and NPC. The prepared electrocatalyst exhibits outstanding catalytic performance for HER (η=234 mV at 10 mA cm−2), OER (η=374 mV at 10 mA cm−2), and ORR (E1/2=0.89 V, vs. reversible hydrogen electrode). Benefiting from the excellent HER performance and outstanding OER activity, the Co−P/Co−N−C/NPC delivers a current density of 10 mA cm−2 for overall water splitting at a cell voltage of 1.59 V, which is comparable with the IrO2–Pt/C couple electrode.

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Fe/N/S-doped mesoporous carbon nanostructures as electrocatalysts for oxygen reduction reaction in acid medium

Cited by 180 publications

References 112 publications

Fe Vacancies Induced Surface FeO₆ in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction

Fe Vacancies Induced Surface FeO₆ in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction

Synergistic Effects between Atomically Dispersed Fe−N−C and C−S−C for the Oxygen Reduction Reaction in Acidic Media

Cobalt–Tannin‐Framework‐Derived Amorphous Co−P/Co−N−C on N, P Co‐Doped Porous Carbon with Abundant Active Moieties for Efficient Oxygen Reactions and Water Splitting

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Fe/N/S-doped mesoporous carbon nanostructures as electrocatalysts for oxygen reduction reaction in acid medium

Cited by 180 publications

References 112 publications

Fe Vacancies Induced Surface FeO6 in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction

Fe Vacancies Induced Surface FeO6 in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction

Synergistic Effects between Atomically Dispersed Fe−N−C and C−S−C for the Oxygen Reduction Reaction in Acidic Media

Cobalt–Tannin‐Framework‐Derived Amorphous Co−P/Co−N−C on N, P Co‐Doped Porous Carbon with Abundant Active Moieties for Efficient Oxygen Reactions and Water Splitting

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Fe Vacancies Induced Surface FeO₆ in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction

Fe Vacancies Induced Surface FeO₆ in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction