Modulation of Single Atomic Co and Fe Sites on Hollow Carbon Nanospheres as Oxygen Electrodes for Rechargeable Zn–Air Batteries

Small Methods, Journal Year: 2020, Volume and Issue: 5(2)

Published: Oct. 9, 2020

Efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and evolution (OER) are required metal air batteries, to replace costly metals, such as Pt Ir/Ru based compounds, which typically used benchmarks ORR OER, respectively. Isolated single atomic sites coordinated with nitrogen on carbon supports (M-N-C) have promising performance replacement of precious catalysts. However, most monometallic M-N-C catalysts demonstrate unsatisfactory performance. Herein, a facile way preparing bimetallic Fe Co entrapped in nitrogen-doped hollow nanospheres (Fe,Co-SA/CS) is explored, drawing the unique structure pore characteristics Zeolitic imidazole frameworks molecular size Ferrocene, an containing species. Fe,Co-SA/CS showed onset potential half wave 0.96 0.86 V, For (Fe,Co)-SA/CS attained its anodic current density 10 mA cm-2 at overpotential 360 mV. Interestingly, electrode activity (ΔE) commercial Pt/C-RuO2 calculated be 0.73 exhibiting catalytic (Fe,Co)-SA/CS. evidenced desirable specific capacity cyclic stability than mixture when utilized cathode homemade Zinc-air battery.

Language: Английский

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Rational Design of Core@shell Structured CoS_x@Cu₂MoS₄ Hybridized MoS₂/N,S‐Codoped Graphene as Advanced Electrocatalyst for Water Splitting and Zn‐Air Battery

Advanced Energy Materials, Journal Year: 2020, Volume and Issue: 10(8)

Published: Jan. 29, 2020

Abstract A novel hybrid of small core@shell structured CoS x @Cu 2 MoS 4 uniformly hybridizing with a molybdenum dichalcogenide/N,S‐codoped graphene hetero‐network (CoS ‐MoS /NSG) is prepared by facile route. It shows excellent performance toward the oxygen reduction reaction (ORR), evolution (OER), and hydrogen (HER) in alkaline medium. The exhibits rapid kinetics for ORR high electron transfer number ≈3.97 exciting durability superior to commercial Pt/C. also demonstrates great potential remarkable stability HER OER, requiring low overpotential 118.1 351.4 mV, respectively, reach current density 10 mA cm −2 . An electrolyzer based on /NSG produces cell voltage 1.60 V long‐term stability, surpassing device Pt/C + RuO /C. In addition, Zn‐air battery using cathodic catalyst delivers ≈1.44 power 40 mW at 58 , better than state‐of‐the‐art catalyst. These achievements are due rational combination highly active large‐area high‐porosity produce unique physicochemical properties multi‐integrated centers synergistic effects. outperformances such suggest an advanced candidate multielectrocatalysis applications metal‐air batteries production.

Language: Английский

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Nitrogen-doped graphene encapsulated FeCoMoS nanoparticles as advanced trifunctional catalyst for water splitting devices and zinc–air batteries

Applied Catalysis B Environment and Energy, Journal Year: 2020, Volume and Issue: 279, P. 119381 - 119381

Published: Aug. 4, 2020

Language: Английский

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Superior Oxygen Electrocatalysis on Nickel Indium Thiospinels for Rechargeable Zn–Air Batteries

ACS Materials Letters, Journal Year: 2019, Volume and Issue: 1(1), P. 123 - 131

Published: May 29, 2019

Developing active bifunctional oxygen catalysts to eliminate/reduce the reliance on precious-metal-based ones in metal–air batteries is nowadays of great importance. Here, we report synthesis nickel indium thiospinel nanosheets supported carbon nanofibers (denoted as NiIn2S4/CNFs) via a facile situ solvothermal growth process and, for first time, demonstrate its superior electrocatalytic performances precatalyst. Electrocatalytic experiments show that NiIn2S4/CNFs not only exhibits positive half-wave potential 0.81 V reduction reaction (ORR) but also delivers lower overpotential 0.39 evolution (OER) at 10 mA cm–2, outperforming those monometallic Ni or In sulfides. Theoretical calculations confirm (220) and (111) plane NiIn2S4 are selectively ORR OER, respectively. Apart from intrinsic nature NiIn2S4, OER activity related oxide/hydroxide species in-situ-formed surface under condition. Moreover, developed pre-catalyst demonstrated be an efficient air-cathode Zn–air batteries. This work brings new perspective designing various ternary thiospinels energy conversion storage.

Language: Английский

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Hierarchically Porous Co/Co_xM_y (M = P, N) as an Efficient Mott–Schottky Electrocatalyst for Oxygen Evolution in Rechargeable Zn–Air Batteries

Small, Journal Year: 2019, Volume and Issue: 15(28)

Published: May 29, 2019

Abstract Tailoring composition and morphology of electrocatalysts is great importance in improving their catalytic performance. Herein, a salt‐templated strategy proposed to construct novel multicomponent Co/Co x M y (M = P, N) hybrids with outstanding electrocatalytic performance for the oxygen evolution reaction (OER). The obtained present porous sheet‐like architecture consisting many hierarchical secondary building‐units. synthetic depends on facile effective dissolution–recrystallization–pyrolysis process under NH 3 atmosphere precursors, which does not involve any surfactant or long‐time hydrothermal pretreatment. That different from conventional methods synthesis nitrides/phosphides. Benefitting unique composition/structure‐dependent merits, as typical Mott–Schottky electrocatalyst exhibit good OER an alkaline medium compared counterparts, evidenced by low overpotential 334 mV at 10 mA cm −2 small Tafel slope 79.2 dec −1 , well superior long‐term stability. More importantly, +Pt/C achieves higher voltaic efficiency several times longer cycle life than RuO 2 catalysts rechargeable Zn–air batteries. It envisioned that work can provide new avenue development sustainable energy storage.

Language: Английский

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Gd-induced electronic structure engineering of a NiFe-layered double hydroxide for efficient oxygen evolution

Journal of Materials Chemistry A, Journal Year: 2021, Volume and Issue: 9(5), P. 2999 - 3006

Published: Jan. 1, 2021

A novel rare earth hybrid electrocatalyst, consisting of a gadolinium-doped hierarchal NiFe-layered double hydroxide, is developed for improving the OER activity.

Language: Английский

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Oxygen Vacancy–Rich In‐Doped CoO/CoP Heterostructure as an Effective Air Cathode for Rechargeable Zn–Air Batteries

Small, Journal Year: 2019, Volume and Issue: 15(46)

Published: Sept. 27, 2019

Abstract An efficient and low‐cost electrocatalyst for reversible oxygen electrocatalysis is crucial improving the performance of rechargeable metal−air batteries. Herein, a novel vacancy–rich 2D porous In‐doped CoO/CoP heterostructure (In‐CoO/CoP FNS) designed developed by facile free radicals–induced strategy as an effective bifunctional Zn–air The electron spin resonance X‐ray absorption near edge spectroscopy provide clear evidence that abundant vacancies are formed in interface In‐CoO/CoP FNS. Owing to vacancies, heterostructure, multiple components, FNS exhibits excellent reduction reaction activity with positive half‐wave potential 0.81 V superior evolution low overpotential 365 mV at 10 mA cm −2 . Moreover, home‐made battery air cathode delivers large power density 139.4 mW , high energy 938 Wh kg Zn −1 can be steadily cycled over 130 h demonstrating great application metal–air

Language: Английский

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Composition-balanced trimetallic MOFs as ultra-efficient electrocatalysts for oxygen evolution reaction at high current densities

Applied Catalysis B Environment and Energy, Journal Year: 2020, Volume and Issue: 279, P. 119375 - 119375

Published: July 28, 2020

Language: Английский

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Superaerophobic/superhydrophilic surfaces as advanced electrocatalysts for the hydrogen evolution reaction: a comprehensive review

Journal of Materials Chemistry A, Journal Year: 2022, Volume and Issue: 10(10), P. 5147 - 5173

Published: Jan. 1, 2022

In this review, the application of superaerophobic/superhydrophilic nanostructured surfaces as efficient and durable electrocatalysts for hydrogen production form electrochemical water splitting have been reviewed discussed.

Language: Английский

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Engineering the abundant heterointerfaces of integrated bimetallic sulfide-coupled 2D MOF-derived mesoporous CoS2 nanoarray hybrids for electrocatalytic water splitting

Materials Today Nano, Journal Year: 2021, Volume and Issue: 17, P. 100146 - 100146

Published: Oct. 12, 2021

Language: Английский

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