Trifunctional Co nanoparticle confined in defect-rich nitrogen-doped graphene for rechargeable Zn-air battery with a long lifetime

Wang, Ansheng; Zhao, Chunning; Yu, Meng; Wang, Weichao

doi:10.1016/j.apcatb.2020.119514

Cited by 151 publications

(78 citation statements)

References 59 publications

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“…Furthermore, distortions occurred on the first metal layer with the doping of P atoms on the warped carbon layer. This result also agrees with literature reporting that the active sites for ORR are located on the carbon shells, and the presence of metallic phase can reduce the work function of the graphene shell, dropping the energy barrier required for ORR [14,17,31].…”

Section: Resultssupporting

confidence: 92%

“…The high-resolution TEM image in Fig. 1b shows that the FeCo-based nanoparticles were wrapped by carbon layers, thus validating that the metallic phase is formed during the pyrolysis process, and its presence catalyzes the formation of carbon shells on it [31]. The d-spacing of the lattice fringe in the wrapped carbons was calculated to be 3.4 Å, which can be assigned to the (002) plane of the graphitic carbon [5,32].…”

Section: Resultsmentioning

confidence: 57%

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Integration of partially phosphatized bimetal centers into trifunctional catalyst for high-performance hydrogen production and flexible Zn-air battery

et al. 2022

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The development of robust and efficient trifunctional catalysts showing excellent oxygen evolution reaction (OER), oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) kinetics has been challenging. Herein, we prepared a hybrid iron and cobalt-based metal alloy phosphide on a phosphorus and nitrogen co-doped carbon substrate (FeCo-P/PNC) as a catalyst using a one-step Pregulation method. The catalyst exhibited a positive half-wave potential of 0.86 V versus the reversible hydrogen electrode (RHE) for ORR, and low overpotentials of 350 and 158 mV for OER and HER, respectively, to achieve a current density of 10 mA cm −2 . Density functional theory calculations demonstrated the dominant role of P in both FeCo phosphide and carbon matrix, which led to the good ORR, OER and HER kinetics. The assembled aqueous and flexible Zn-air batteries with FeCo-P/PNC as the air cathode displayed excellent peak power densities of 195.1 and 90.8 mW cm -2 , respectively, as well as outstanding charging-discharging performance, long lifetime, and high flexibility. Moreover, the self-powered overall water-splitting cell exhibited a low working voltage of 1.71 V to achieve a current density of 10 mA cm −2 , confirming its excellent multifunctional OER/ORR/HER activity.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 57%

Integration of partially phosphatized bimetal centers into trifunctional catalyst for high-performance hydrogen production and flexible Zn-air battery

et al. 2022

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“…As expected, the cubic FeCo-MOFs precursor was uniformly covered with several robust carbon layers, which could avoid the oxidation and aggregation of FeCo alloy, prohibit its structural deterioration under a severe environment, and improve the conductivity of the precursor. [27,28] Ultimately, after being calcined at 800 °C in NH 3 , these FeCo-MOFs/PDA nanoparticles were carbonized and transformed into FeCo alloy nanoparticles encapsulated in N-doped hollow carbon nanocubes (denoted as FeCo-NPs/NC). Meanwhile, bimetallic FeNi-NPs/NC, CoNi-NPs/NC, FeCo-NPs/ NC-700, FeCo-NPs/NC-900 at different pyrolysis temperatures, and FeCo-NPs calcinated in H 2 /Ar were also prepared.…”

Section: Resultsmentioning

confidence: 99%

Dual‐Active Sites Engineering of N‐Doped Hollow Carbon Nanocubes Confining Bimetal Alloys as Bifunctional Oxygen Electrocatalysts for Flexible Metal–Air Batteries

Xie

Hao

et al. 2021

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Since the sluggish kinetic process of oxygen reduction (ORR)/evolution (OER) reactions, the design of highly‐efficient, robust, and cost‐effective catalysts for flexible metal–air batteries is desired but challenging. Herein, bimetallic nanoparticles encapsulated in the N‐doped hollow carbon nanocubes (e.g., FeCo‐NPs/NC, FeNi‐NPs/NC, and CoNi‐NPs/NC) are rationally designed via a general heat‐treatment strategy of introducing NH3 pyrolysis of dopamine‐coated metal–organic frameworks. Impressively, the resultant FeCo‐NPs/NC hybrid exhibits superior bifunctional electrocatalytic performance for ORR/OER, manifesting exceptional discharging performance, outstanding lifespan, and prime flexibility for both Zn/Al–air batteries, superior to those of state‐of‐the‐art Pt/C and RuO2 catalysts. X‐ray absorption near edge structure and density functional theory indicate that the strong synergy between FeCo alloy and N‐doped carbon frameworks has a distinctive activation effect on bimetallic Fe/Co atoms to synchronously modify the electronic structure and afford abundant dual‐active Fe/Co–Nx sites, large surface area, high nitrogen doping level, and conductive carbon frameworks to boost the reversible oxygen electrocatalysis. Such N‐doped carbon with bimetallic alloy bonds provides new pathways for the rational creation of high‐efficiency energy conversion and storage equipment.

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“…In the Co@N‐C/PCNF composite, the N‐doped carbon shell not only protects Co nanoparticles from alkaline electrolyte corrosion, but also provides Co—N—C moiety with Co atoms in the well‐coupled interface. [ 28 , 29 , 30 ] The fabricated composite offers unique advantages including high graphitization degree, homogeneous distribution of Co nanoparticles without aggregation, and large specific surface area with an ultrathin carbon layer, which is beneficial for enlarging active sites exposure and promotes the mass transfer rate. [ 31 , 32 ] The experimental and theoretical results suggest that the local environmental and electrical structure of Co in the composite can be modulated in the Co—N—C moiety, which optimizes its adsorption/desorption energies and in turn boosts intrinsic OER/ORR activities.…”

Section: Introductionmentioning

confidence: 99%

Encapsulating Cobalt Nanoparticles in Interconnected N‐Doped Hollow Carbon Nanofibers with Enriched CoNC Moiety for Enhanced Oxygen Electrocatalysis in Zn‐Air Batteries

et al. 2021

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Rational design of bifunctional efficient electrocatalysts for both oxygen reduction (ORR) and oxygen evolution reactions (OER) is desirable-while highly challenging-for development of rechargeable metal-air batteries. Herein, an efficient bifunctional electrocatalyst is designed and fabricated by encapsulating Co nanoparticles in interconnected N-doped hollow porous carbon nanofibers (designated as Co@N-C/PCNF) using an ultrafast high-temperature shock technology. Benefiting from the synergistic effect and intrinsic activity of the Co-N-C moiety, as well as porous structure of carbon nanofibers, the Co@N-C/PCNF composite shows high bifunctional electrocatalytic activities for both OER (289 mV at 10 mA cm −2 ) and ORR (half-wave potential of 0.85 V). The Co-N-C moiety in the composite can modulate the local environmental and electrical structure of the catalysts, thus optimizing the adsorption/desorption kinetics and decreasing the reaction barriers for promoting the reversible oxygen electrocatalysis. Co@N-C/PCNF-based aqueous Zn-air batteries (AZAB) provide high power density of 292 mW cm −2 , and the assembled flexible ZAB can power wearable devices.

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Trifunctional Co nanoparticle confined in defect-rich nitrogen-doped graphene for rechargeable Zn-air battery with a long lifetime

Cited by 151 publications

References 59 publications

Integration of partially phosphatized bimetal centers into trifunctional catalyst for high-performance hydrogen production and flexible Zn-air battery

Integration of partially phosphatized bimetal centers into trifunctional catalyst for high-performance hydrogen production and flexible Zn-air battery

Dual‐Active Sites Engineering of N‐Doped Hollow Carbon Nanocubes Confining Bimetal Alloys as Bifunctional Oxygen Electrocatalysts for Flexible Metal–Air Batteries

Encapsulating Cobalt Nanoparticles in Interconnected N‐Doped Hollow Carbon Nanofibers with Enriched CoNC Moiety for Enhanced Oxygen Electrocatalysis in Zn‐Air Batteries

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