MnxOy/NC and CoxOy/NC Nanoparticles Embedded in a Nitrogen‐Doped Carbon Matrix for High‐Performance Bifunctional Oxygen Electrodes

Masa, Justus; Xia, Wei; Sinev, Ilya; Zhao, Anqi; Sun, Zhenyu; Grützke, Stefanie; Weide, Philipp; Mühler, Martin; Schuhmann, Wolfgang

doi:10.1002/anie.201402710

Cited by 498 publications

(377 citation statements)

References 32 publications

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“…It is believed that the introduction of cobalt sulfide and N, S dopants results in the adjacent carbon atoms positively charged, which can not only facilitate the adsorption of OH ions, but also promote the electron transfer between the catalyst surfaces and reaction intermediates. [75][76][77] Significantly, the potential acquired for the current density of 10 mA cm -2 of Co x S y @C-1000 is comparable to those of other reported OER catalysts (as shown in Table S3). Furthermore, in the chronoamperometric test, the sample Co x S y @C-1000 can remain 80% its relative current after 10000 s (Fig.…”

Section: Resultssupporting

confidence: 82%

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

et al. 2015

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Exploring highly-efficient and low-cost bifunctional electrocatalysts for both oxygen reduction reaction (ORR) and oxygen evolution reactions (OER) in the renewable energy area has gained its momentum but still remains a significant challenge. Here we represent a simple but efficient way that utilizes ZIF-67 as the precursor and template for the one-step generation of homogeneous dispersed cobalt sulfide/N,S-codoped porous carbon nanocomposites as high-performance electrocatalysts. Due to the favourable molecular-like structural features and uniform dispersed active sites in the precursor, the resulting nanocomposites featured with unique core-shell structure, high porosity, homogeneous dispersion active components together with N and S-doping effect, not only show excellent electrocatalytic activity towards ORR with the high onset potential (around -0.04 V vs -0.02 V for benchmark Pt/C catalyst) and four-electron pathway, and OER with a small overpotential of 0.47 V for 10 mA cm −2 current density, but also exhibit superior stability (92%) to commercial Pt/C catalyst (74%) in ORR and promising OER stability (80%) with good methanol tolerance. Our findings suggest that the transition metal sulfide-porous carbon nanocomposites derived from the one-step simultaneously sulfurization and carbonization of zeolitic imidazolate frameworks are excellent alternative bifuncitonal electrocatalysts towards ORR and OER in the next generation of energy storage and conversion technologies.With the depletion of hydrocarbon-based energy resources and the increasing global energy demands, it is imperative to develop green and sustainable energy storage and conversion technologies as alternatives to currently widely used fossil fuels. 1-3 Electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play key roles in several important next-generation energy storage and conversion technologies, such as fuel cells, metal-air batteries and water splitting. [4][5][6][7][8][9][10][11][12][13] Hitherto, most efficient electrocatalysts for ORR/OER contain precious metals including Pt or Ir; however, due to the prohibitive cost, poor stability of precious metals, the sluggish kinetics for ORR and the large polarisation, it is highly desirable to discover highly efficient and low-cost earthabundant non-precious electroactive materials that can rival the performances of precious metal-based catalysts. 14-17Many efforts have, therefore, been devoted to transition metal oxides/sulfides based materials, as many transition metals like cobalt, manganese have been widely considered to be electrochemical active for ORR and OER. Particularly, cobalt sulfides (Co x S y ) with different phases have been previously investigated as ORR and OER electrode catalysts and exhibited attractive electrocatalytic performance among different nonprecious and late transition metal chalcogenides.18 Co 9 S 8 is a good catalyst for ORR. 21 However, the complicated preparation procedures coupled with the low electrical conductivities of cobalt s...

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Section: Resultssupporting

confidence: 82%

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

et al. 2015

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“…The core-level spectrum of Co is divided into two main signals assigned to Co2p 1/2 and Co2p 3/2 , and the spin-orbit doublets confirm the presence of Co 2+ and Co 3+ . [30][31][32] Hence, both Co 9 S 8 and NSPC are expected to act as potential active sites for OER and ORR.…”

Section: Resultsmentioning

confidence: 99%

In situ anchoring of Co9S8 nanoparticles on N and S co-doped porous carbon tube as bifunctional oxygen electrocatalysts

et al. 2016

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The development of cost-effective yet highly active and robust bifunctional electrocatalyst for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) has been at the forefront of research into regenerative fuel cells and metal-air batteries. Here we report Co 9 S 8 nanoparticles grown in situ on nitrogen-and sulfur-doped porous carbon (Co 9 S 8 /NSPC) as a bifunctional catalyst for OER and ORR using poly(2-aminothiazole) as a novel all-in-one multifunctional precursor. Unexpectedly, Co 9 S 8 /NSPC exhibits a low OER overpotential, positive ORR half-wave potential, small potential gap and high durability, thus making it one of the best bifunctional OER and ORR catalysts. This may be attributed to the heteroatom doping, porous structure and synergistic effects of Co 9 S 8 and NSPC, as confirmed by density functional theory calculations. More importantly, as a proof-of-concept application, the air electrode with Co 9 S 8 /NSPC9-45 endows the Zn-air battery with a low discharge/charge overpotential and good cycling stability.

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“…[1] Although Pt-, Ru-, or Ir-based materials have been widely accepted as the most active catalysts for the ORR or OER, the scarcity and high cost have limited their widespread applications in clean energy technology. [2] Recently,p recious-metal-free bifunctional oxide catalysts have attracted considerable attention, including Co 3 O 4 nanowire arrays, [3] perovskite Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3Àd, [4] Co 3 O 4 /graphene, [5] Co x O y /NC, [6] and spinel oxides Co x Mn 3Àx O 4 .…”

mentioning

confidence: 99%

Integrating NiCo Alloys with Their Oxides as Efficient Bifunctional Cathode Catalysts for Rechargeable Zinc–Air Batteries

et al. 2015

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The lack of high-efficient, low-cost, and durable bifunctional electrocatalysts that act simultaneously for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is currently one of the major obstacles to commercializing the electrical rechargeability of zinc-air batteries. A nanocomposite CoO-NiO-NiCo bifunctional electrocatalyst supported by nitrogen-doped multiwall carbon nanotubes (NCNT/CoO-NiO-NiCo) exhibits excellent activity and stability for the ORR/OER in alkaline media. More importantly, real air cathodes made from the bifunctional NCNT/CoO-NiO-NiCo catalysts further demonstrated superior performance to state-of-the-art Pt/C or Pt/C+IrO2 catalysts in primary and rechargeable zinc-air batteries.

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Mn_xO_y/NC and Co_xO_y/NC Nanoparticles Embedded in a Nitrogen‐Doped Carbon Matrix for High‐Performance Bifunctional Oxygen Electrodes

Cited by 498 publications

References 32 publications

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

In situ anchoring of Co9S8 nanoparticles on N and S co-doped porous carbon tube as bifunctional oxygen electrocatalysts

Integrating NiCo Alloys with Their Oxides as Efficient Bifunctional Cathode Catalysts for Rechargeable Zinc–Air Batteries

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