PVP-assisted transformation of a metal–organic framework into Co-embedded N-enriched meso/microporous carbon materials as bifunctional electrocatalysts

Liang, Zuozhong; Zhang, Chaochao; Yuan, Haitao; Zhang, Wei; Zheng, Haoquan; Cao, Rui

doi:10.1039/c8cc02646g

Cited by 175 publications

(66 citation statements)

References 46 publications

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“…[18] Upon the addition of PVP,t he ZIF-8 crystalsc ould be encapsulatedb yr GO, leadingt ot he rGO-Fe-ZIF-8 composite structure rather than the mixture of two separated phases. Therefore, as hort-time solvothermal reaction that enables in situ doping and in situ assembly was employed in this work.…”

Section: Resultsmentioning

confidence: 99%

Bottom‐Up Fabrication of a Sandwich‐Like Carbon/Graphene Heterostructure with Built‐In FeNC Dopants as Non‐Noble Electrocatalyst for Oxygen Reduction Reaction

Xue

Gan

et al. 2020

Chemistry An Asian Journal

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High-performance non-noble electrocatalysts for oxygen reduction reaction( ORR) are the prerequisite for large-scale utilization of fuel cells. Herein, at ype of sandwiched-liken on-noblee lectrocatalyst with highly dispersed FeN x active sites embedded in ah ierarchically porous carbon/graphene heterostructure was fabricated using a bottom-up strategy.T he in situ ion substitution of Fe 3 + in a nitrogen-containing MOF (ZIF-8) allows the Fe-heteroatoms to be uniformly distributed in the MOF precursor,a nd the assembly of Fe-doped ZIF-8 nano-crystals with grapheneoxide and in situ reduction of graphene-oxide afford as andwiched-like Fe-doped ZIF-8/graphene heterostructure. This type of heterostructuree nables simultaneous optimization of FeN x active sites, architecture and interfacep roperties for obtaining an electron-catalyst after ao ne-step carbonization. The synergistic effect of these factorsr ender the resulting catalysts with excellent ORR activities. The half-wave potential of 0.88 Vv s. RHE outperforms most of the none-noble metal catalysta nd is comparable with the commercial Pt/C (20 wt %) catalyst. Apart from the high activity,t his catalyst exhibits excellent durability and good methanol-tolerance. Detailed investigations demonstrate that am oderatec ontent of Fe dopantsc an effectively increaset he intrinsic activities, andt he hybridization of graphene can enhancet he reaction kinetics of ORR. The strategy proposed in this work gives an inspiration towards developing efficient noblemetal-free electrocatalysts for ORR.[a] Dr.

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Section: Resultsmentioning

confidence: 99%

Bottom‐Up Fabrication of a Sandwich‐Like Carbon/Graphene Heterostructure with Built‐In FeNC Dopants as Non‐Noble Electrocatalyst for Oxygen Reduction Reaction

Xue

Gan

et al. 2020

Chemistry An Asian Journal

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“…The satellite peak of Co 2p 3/2 at 785.2 eV waso bserved, which was similar to those of Co@NC ( Figure S6 in the Supporting Information). [74,85,86] The Nc ontentsi nC uCo@NC, Co@NC, and NC are calculated to be 3.83, 3.71, and 1.04 at %, respectively,w hich are much higher than that in Co encapsulated with N-doped carbon derived from ZIF-L. [73] NC was derived from ZIF-L-Zn at 900 8Ci n Ar,w hich has the same topological structure as ZIF-L-Co and is used as ar eference. The Cu 2p satellite peak at 944.2 eV can be attributed to Cu II species in CuCo@NC owing to the unfilled electron state of Cu 3d 9 orbitals.…”

Section: Resultsmentioning

confidence: 99%

“…[11,[67][68][69][70][71][72][73] Recently,Z heng and co-workers re-portedC u,Co@NC derivedf rom ZIF-67 and Cu(OH) 2 .I nstead of CuCo alloy nanoparticles,t he Cu and Co nanoparticles were separately but homogeneously distributed in NC framework. [11,[67][68][69][70][71][72][73] Recently,Z heng and co-workers re-portedC u,Co@NC derivedf rom ZIF-67 and Cu(OH) 2 .I nstead of CuCo alloy nanoparticles,t he Cu and Co nanoparticles were separately but homogeneously distributed in NC framework.…”

Section: Introductionmentioning

confidence: 99%

2D Metal–Organic Framework Derived CuCo Alloy Nanoparticles Encapsulated by Nitrogen‐Doped Carbonaceous Nanoleaves for Efficient Bifunctional Oxygen Electrocatalyst and Zinc–Air Batteries

Huo

Wang

Zhang

et al. 2019

Chemistry A European J

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The development of efficient bifunctional electrocatalysts for the oxygen reduction reaction( ORR) and oxygen evolution reaction( OER) still remains ac hallenge in aw ide range of renewable energy technologies. Herein, CuCo alloy nanoparticlese ncapsulatedb yn itrogen-doped carbonaceous nanoleaves (CuCo-NC) have been synthesized from aC u(OH) 2 /2D leaf-like zeolitic imidazolate framework (ZIF-L)-pyrolysis approach. Leaf-like Cu(OH) 2 is first prepared by the ultrasound-induced self-assembly of Cu(OH) 2 nanowires. The efficient encapsulation of Cu(OH) 2 in ZIF-L is ob-tained owing to the morphologyf itting between the leaflike Cu(OH) 2 and ZIF-L. CuCo-NC catalysts present superior electrocatalytic activity and stability toward ORR and OER over the commercial Pt/C and IrO 2 ,r espectively,w hich are furtheru sed as bifunctionalo xygen electrocatalysts in Zn-air batteries and exhibit impressive performance,w ith ah igh peak powerdensity of 303.7 mW cm À2 ,large specific capacity of up to 751.4 mAh g À1 at 20 mA cm À2 ,a nd as uperior recharge stability.

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“…More recently, Liang et al. reported a PVP‐assisted pyrolysis method to transform ZIF‐67 into a Co‐embedded N‐enriched meso/microporous carbon (P−Co−NC) material . Various porous structures were prepared by adjusting the amount of PVP.…”

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

confidence: 99%

“…However, it is still difficult to compare the ORR activities with different morphologies due to the difference of the corresponding system. The larger BET surface area of the materials results in a higher ORR performance within the same system ,. Therefore, designing M−N−C electrocatalysts with single metal atoms and high BET surface area is an efficient way to obtain a high ORR performance.…”

Section: 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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PVP-assisted transformation of a metal–organic framework into Co-embedded N-enriched meso/microporous carbon materials as bifunctional electrocatalysts

Cited by 175 publications

References 46 publications

Bottom‐Up Fabrication of a Sandwich‐Like Carbon/Graphene Heterostructure with Built‐In FeNC Dopants as Non‐Noble Electrocatalyst for Oxygen Reduction Reaction

Bottom‐Up Fabrication of a Sandwich‐Like Carbon/Graphene Heterostructure with Built‐In FeNC Dopants as Non‐Noble Electrocatalyst for Oxygen Reduction Reaction

2D Metal–Organic Framework Derived CuCo Alloy Nanoparticles Encapsulated by Nitrogen‐Doped Carbonaceous Nanoleaves for Efficient Bifunctional Oxygen Electrocatalyst and Zinc–Air Batteries

Importance of Electrocatalyst Morphology for the Oxygen Reduction Reaction

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