“Wiring” redox-active polyoxometalates to carbon nanotubes using a sonication-driven periodic functionalization strategy

Hu, Jun; Ji, Yanyan; Chen, Wei; Streb, Carsten; Song, Yu‐Fei

doi:10.1039/c5ee03084f

Cited by 133 publications

(104 citation statements)

References 44 publications

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“…[16][17][18] Functionalizing CNTs with suitable OER and ORR catalysts could therefore be a feasible approach to overcome the inherent low catalytic activity of CNTs. Carbon nanomaterials such as carbon nanotubes (CNTs), have received significant interest as nanostructured electrodes as they feature electrical conductivity as well as mechanical and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Composite Metal Oxide‐Carbon Nanotube Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions

Luo

Wang

et al. 2018

ChemElectroChem

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Electrocatalysts capable of performing both the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) are key components for energy technologies including fuel cells, and water electrolysis. High-performance catalysts based on earth abundant components are therefore a prime research theme. Herein, we report the development of a series of novel composites based on nanostructured iron-doped CoWO 4 particles electrically linked to conductive carbon nanotubes (CNTs) using a facile one-pot hydrothermal method. It is shown that tuning of the iron content of Co 1-x Fe x WO 4 ÀCNT composites (x = 0-1) allows structural and reactivity control. The Co 1-x Fe x WO 4 ÀCNT composites are active and stable OER and ORR electrocatalysts, and follow the Sabatier principle. For Co 0.5 Fe 0.5 WO 4 ÀCNT, minimum overpotentials of h = 290 mV and low Tafel slopes of 42 mV dec À1 are achieved at a current density of j = 10 mA cm À2 for OER, and the Co 0.5 Fe 0.5 WO 4 ÀCNT shows high catalytic activity for ORR with half-wave potential of 0.74 V. As such, the composites show high potential as OER and ORR electrocatalysts, so that technologically viable, noble-metal-free, tunable electrocatalysts with relevance for alkaline water electrolysis can be designed from the bottom up.

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Section: Introductionmentioning

confidence: 99%

Composite Metal Oxide‐Carbon Nanotube Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions

Luo

Wang

et al. 2018

ChemElectroChem

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“…Multiwalled carbon nanotubes (MWCNTs) werep retreated with concentrated HNO 3 (65 %) to introduce oxidized surfacec arbon groups (e.g., ÀCOH, ÀCOOH) suitable for metal oxide anchoring. [33,40] Stable anchoring of the metal oxidesa nd carbides on the MWCNTsw as then achievedb yc alcination of the composite at 600, 750, and 900 8C. [39] For the deposition of the precursor on multiwalled CNTs, we used ar ecently established mild sonication route.…”

Section: Synthesismentioning

confidence: 99%

Transition‐Metal Oxides/Carbides@Carbon Nanotube Composites as Multifunctional Electrocatalysts for Challenging Oxidations and Reductions

Xing

Liu

Cao

et al. 2019

Chemistry A European J

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Ther apid development of renewable-energy technologies such as water splitting, rechargeable metal-air batteries, and fuel cells requires highly efficient electrocatalysts capable of the oxygen-reduction reaction( ORR) and the oxygen-evolution reaction( OER). Herein, we report af acile sonication-driven synthesis to deposit the molecular manganese vanadium oxide precursor [Mn 4 V 4 O 17 (OAc) 3 ] 3À on multiwalled carbon nanotubes (MWCNTs). Thermal conversion of this composite at 900 8Cg ives nanostructured manganese vanadium oxides/carbides, which are stably linked to the MWCNTs. The resulting composites show excellent electrochemical reactivity for ORR and OER, and significant reactivi-ty enhancements compared with the precursors and aP t/C reference are reported.N otably,e ven under harsh acidic conditions, long-term OER activity at low overpotential is reported. In addition, we report exceptional activity of the composites for the industrially important Cl 2 evolution from an aqueous HCl electrolyte. The new composite material showsh ow molecular deposition routes leading to highly active and stable multifunctional electrocatalysts can be developed.T he facile design could in principle be extended to multiple catalystc lasses by tuning of the molecular metal oxide precursor employed.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.Scheme1.Schematicillustration of the synthesized composites( MC x / MO x = Mn 7 C 3 /V 8 C 7 /MnO).Figure 1. PowderX-ray diffraction of a) composites prepared at different temperatures and b) 1-900 with specified peaks.

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“…Polyoxometalates (POMs), as a class of anionic transition metal oxides, which show a rich diversity of structural types and reversible multi‐electron redox behaviours . Owing to their unique electron sponge behaviour, POMs exhibit proton‐coupled multi‐electron transfers .…”

Section: Introductionmentioning

confidence: 99%

Devisable POM/Ni Foam Composite: Precisely Control Synthesis toward Enhanced Hydrogen Evolution Reaction at High pH

Jia

Streb

Song

2019

Chemistry A European J

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Polyoxometalates (POMs) are promising catalysts for the electrochemical hydrogen production from water owing to their high intrinsic catalytic activity and chemical tunability.H owever,p oor electrical conductivity and easy detachment of the POMs from the electrode cause significant challenges under operating condition. Herein, as imple onestep hydrothermal methodi sr eportedt os ynthesize as eries of Dexter-Silverton POM/Ni foam composites (denoted as NiM-POM/Ni; M = Co, Zn, Mn), in which the stable linkage between the POM catalysts and the Ni foam electrodes lead to high activity for the hydrogen evolution reaction (HER).Amongthem, the highest HER performance can be observed in the NiCo-POM/Ni, featuring an overpotential of 64 mV (at 10 mA cm À2 ,v s. reversible hydrogen electrode), and aT afel slope of 75 mV dec À1 in 1.0 m aqueous KOH. Moreover, the NiCo-POM/Ni catalyst showedahigh faradaic efficiency % 97 %f or HER. Post-catalytic of NiCo-POM/Ni analyses showedv irtually no mechanical or chemical degradation. The findings propose af acile and inexpensivem ethodt o designs table and effective POM-based catalysts for HER in alkaline water electrolysis.

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“Wiring” redox-active polyoxometalates to carbon nanotubes using a sonication-driven periodic functionalization strategy

Abstract: A universal one-step strategy for the periodic deposition of redox-active polyoxometalate nanocrystals on single-walled carbon nanotubes is reported, giving access to high-performance electrodes for lithium-ion batteries.

Cited by 133 publications

References 44 publications

Composite Metal Oxide‐Carbon Nanotube Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions

Composite Metal Oxide‐Carbon Nanotube Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions

Transition‐Metal Oxides/Carbides@Carbon Nanotube Composites as Multifunctional Electrocatalysts for Challenging Oxidations and Reductions

Devisable POM/Ni Foam Composite: Precisely Control Synthesis toward Enhanced Hydrogen Evolution Reaction at High pH

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