Trifunctional Self‐Supporting Cobalt‐Embedded Carbon Nanotube Films for ORR, OER, and HER Triggered by Solid Diffusion from Bulk Metal

Yang, Zhengkun; Zhao, Changming; Qu, Yunteng; Zhou, Huang; Zhou, Fangyao; Wang, Jing; Wu, Yuen; Li, Yadong

doi:10.1002/adma.201808043

Cited by 335 publications

(198 citation statements)

References 35 publications

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“…In the plot of geometry area–normalized current density versus iR corrected potential, Figure a shows the OER polarization curves of NP Au/CoMoN x , Au/CoMoO 4 , Au/CoN x , and Au/RuO 2 electrodes, as well as free CoMoN x nanosheets on GC electrode. For comparison, the OER polarization curve of commercially available RuO 2 catalyst immobilized on GC electrode is also included in this plot, with the overpotential of 330 mA at 10 mA cm −2 and the Tafel slope of 63 mV dec −1 , which are in agreement with the values reported previously (Table S1, Supporting Information) . This indicates the validation of the OER experimental measurement.…”

supporting

confidence: 85%

Flexible Co–Mo–N/Au Electrodes with a Hierarchical Nanoporous Architecture as Highly Efficient Electrocatalysts for Oxygen Evolution Reaction

et al. 2020

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Designing highly active and robust electrocatalysts for oxygen evolution reaction (OER) is crucial for many renewable energy storage and conversion devices. Here, self‐supported monolithic hybrid electrodes that are composed of bimetallic cobalt–molybdenum nitride nanosheets vertically aligned on 3D and bicontinuous nanoporous gold (NP Au/CoMoNx) are reported as highly efficient electrocatalysts to boost the sluggish reaction kinetics of water oxidation in alkaline media. By virtue of the constituent CoMoNx nanosheets having large accessible CoMoOx surface with remarkably enhanced electrocatalytic activity and the nanoporous Au skeleton facilitating electron transfer and mass transport, the NP Au/CoMoNx electrode exhibits superior OER electrocatalysis in 1 m KOH, with low onset overpotential (166 mV) and Tafel slope (46 mV dec−1). It only takes a low overpotential of 370 mV to reach ultrahigh current density of 1156 mA cm−2, ≈140‐fold higher than free CoMoNx nanosheets. The electrocatalytic performance makes it an attractive candidate as the OER catalyst in the water electrolysis.

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confidence: 85%

Flexible Co–Mo–N/Au Electrodes with a Hierarchical Nanoporous Architecture as Highly Efficient Electrocatalysts for Oxygen Evolution Reaction

et al. 2020

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“…Especially, metal–organic frameworks (MOFs) are considered to be promising due to the abundant carbon, nitrogen, and transition‐metals along with the uniform porous structure . And their derivatives often remain excellent porous architectures with abundant heteroatoms dopants and active metal centers, which contribute to the catalytic activity for oxygen electrochemical reactions . For example, carbon polyhedral encased core/shell CoO x nanoparticles and Co‐decorated N‐doped graphitic carbon nanocages derived from zeolitic‐imidazolate frameworks (ZIFs) exhibited bifunctional electrocatalytic performance for ORR and OER .…”

Section: Introductionmentioning

confidence: 99%

2D Nitrogen‐Doped Carbon Nanotubes/Graphene Hybrid as Bifunctional Oxygen Electrocatalyst for Long‐Life Rechargeable Zn–Air Batteries

Deng

Chen

et al. 2019

Adv Funct Materials

218

141

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The rational construction of efficient bifunctional oxygen electrocatalysts is of immense significance yet challenging for rechargeable metal-air batteries. Herein, this work reports a metal-organic framework derived 2D nitrogendoped carbon nanotubes/graphene hybrid as the efficient bifunctional oxygen electrocatalyst for rechargeable zinc-air batteries. The as-obtained hybrid exhibits excellent catalytic activity and durability for the oxygen electrochemical reactions due to the synergistic effect by the hierarchical structure and heteroatom doping. The assembled rechargeable zinc-air battery achieves a high power density of 253 mW cm −2 and specific capacity of 801 mAh g Zn −1 with excellent cycle stability of over 3000 h at 5 mA cm −2 .Moreover, the flexible solid-state rechargeable zinc-air batteries assembled by this hybrid oxygen electrocatalyst exhibits a high discharge power density of 223 mW cm −2 , which can power 45 light-emitting diodes and charge a cellphone. This work provides valuable insights in designing efficient bifunctional oxygen electrocatalysts for long-life metal-air batteries and related energy conversion technologies.

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“…Thec omposite nanoparticles are inspired by carbonsupported non-noble metal electrocatalysts. [10] Thew elldefined molecular structure and morphology of the ZIF-67 nanocrystals allow precise quantification of the number of Co atoms in the N-doped carbon composite (Co À N/C). [11] The poor stability of the commonly used miniaturized Ag-based "quasi-reference/counter electrode (QRCE)" systems,h ere chloridized silver wires,a th igher current densities and at alkaline pH values leads to aconsiderable drift in the working electrode potential making the nanoscale voltammetric measurements unreliable.…”

mentioning

confidence: 99%

Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media

et al. 2019

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“Single entity” measurements are central for an improved understanding of the function of nanoparticle‐based electrocatalysts without interference arising from mass transfer limitations and local changes of educt concentration or the pH value. We report a scanning electrochemical cell microscopy (SECCM) investigation of zeolitic imidazolate framework (ZIF‐67)‐derived Co−N‐doped C composite particles with respect to the oxygen evolution reaction (OER). Surmounting the surface wetting issues as well as the potential drift through the use of a non‐interfering Os complex as free‐diffusing internal redox potential standard, SECCM could be successfully applied in alkaline media. SECCM mapping reveals activity differences relative to the number of particles in the wetted area of the droplet landing zone. The turnover frequency (TOF) is 0.25 to 1.5 s−1 at potentials between 1.7 and 1.8 V vs. RHE, respectively, based on the number of Co atoms in each particle. Consistent values at locations with varying number of particles demonstrates OER performance devoid of macroscopic film effects.

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Trifunctional Self‐Supporting Cobalt‐Embedded Carbon Nanotube Films for ORR, OER, and HER Triggered by Solid Diffusion from Bulk Metal

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201808043.

Cited by 335 publications

References 35 publications

Flexible Co–Mo–N/Au Electrodes with a Hierarchical Nanoporous Architecture as Highly Efficient Electrocatalysts for Oxygen Evolution Reaction

Flexible Co–Mo–N/Au Electrodes with a Hierarchical Nanoporous Architecture as Highly Efficient Electrocatalysts for Oxygen Evolution Reaction

2D Nitrogen‐Doped Carbon Nanotubes/Graphene Hybrid as Bifunctional Oxygen Electrocatalyst for Long‐Life Rechargeable Zn–Air Batteries

Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media

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