An extremely facile route to Co2P encased in N,P-codoped carbon layers: Highly efficient bifunctional electrocatalysts for ORR and OER

Li, Jun; Liu, Guiyu; Liu, Beibei; Min, Ziyan; Qian, Dong; Jiang, Jianbo; Li, Junhua

doi:10.1016/j.ijhydene.2017.11.102

Cited by 124 publications

(46 citation statements)

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“…The Ta fel slope of FeNi@C/NG (105 mV dec À1 )i ss imilar to that of RuO 2 (91 mV dec À1 ), implying the FeNi@C/NG catalyst possessed excellent OER kinetics and efficiency. [36,37] From the EIS measurementsf or OER at 1.62 V, it can be seen that the charge transfer resistance of FeNi@C/NG is smaller than that of the as-prepared catalysts ( Figure S14 in the Supporting Information). The overall oxygen electrode performances forO RR/OER are assessedb yt he potential gap (DE, DE = E OER ÀE 1/2 )a ss hown in Figure6ca nd the values are listed in Ta ble S2 (in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Yang

et al. 2020

Chemistry A European J

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The development of cost‐effective and durable oxygen electrocatalysts remains highly critical but challenging for energy conversion and storage devices. Herein, a novel FeNi alloy nanoparticle core encapsulated in carbon shells supported on a N‐enriched graphene‐like carbon matrix (denoted as FeNi@C/NG) was constructed by facile pyrolyzing the mixture of metal salts, glucose, and dicyandiamide. The in situ pyrolysis of dicyandiamide in the presence of glucose plays a significant effect on the fabrication of the porous FeNi@C/NG with a high content of doped N and large specific surface area. The optimized FeNi@C/NG catalyst displays not only a superior catalytic performance for the oxygen reduction reaction (ORR, with an onset potential of 1.0 V and half‐wave potential of 0.84 V) and oxygen evolution reaction (OER, the potential at 10 mA cm−2 is 1.66 V) simultaneously in alkaline, but also outstanding long‐term cycling durability. The excellent bifunctional ORR/OER electrocatalytic performance is ascribed to the synergism of the carbon shell and FeNi alloy core together with the high‐content of nitrogen doped on the large specific surface area graphene‐like carbon.

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Section: Resultsmentioning

confidence: 99%

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Yang

et al. 2020

Chemistry A European J

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“…The number of electron transfer was calculated from the following Koutecky‐Levich (K−L) equations [Eqs. (2)–]:

true \frac{1}{J} = \frac{1}{{normalJ}_{normalL}} + \frac{1}{{normalJ}_{normalk}} = \frac{1}{normalB ω^{1 / 2}} + \frac{1}{{normalJ}_{normalk}}

true J_{k} = normaln normalF normalk C_{0}

true normalB = 0.62 normaln normalF C_{0} D_{0}^{2 / 3} υ^{- 1 / 6}

…”

Section: Methodsmentioning

confidence: 99%

“…The Tafel slope for linear sweep voltammogram of both ORR and OER were evaluated based on Tafel relation [Eq. ]:

true η = normala + normalb normall normalo normalg ((), j)

…”

Section: Methodsmentioning

confidence: 99%

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Metal Silicide Nanosphere Decorated Carbon‐Rich Polymer‐Derived Ceramics: Bifunctional Electrocatalysts towards Oxygen and their Application in Anion Exchange Membrane Fuel Cells

et al. 2019

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The current hindrance in the commercialization of electrochemical devices such as fuel cells and metal–air batteries is the high cost and poor stability of widely employed noble‐metal‐based electrocatalysts. In this report, a new intermetallic nickel/cobalt silicide‐decorated carbon‐rich silica‐based ceramic composites (Co/SiOC or Ni/SiOC) were successfully synthesized as alternative bifunctional electrocatalysts. The oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) kinetics of the prepared composite materials were evaluated by electrochemical characterization. Co/SiOC exhibited more positive ORR kinetics with the onset potential of 0.87 V vs. RHE compared to that of Ni/SiOC, which is slightly lower compared to Pt/C. Conversely, Ni/SiOC exhibits a 50 mV more positive OER onset potential compared to Co/SiOC with almost similar OER kinetics to RuO2. The bifunctional ability concluded that Ni/SiOC was a good bifunctional catalyst with an oxygen electrode potential 0.89 V. As Co/SiOC performs as a better ORR catalyst, it was utilized as a cathode catalyst for the construction of anion exchange membrane fuel cell and its fuel cell performance was evaluated. The Co/SiOC composites produce a peak power density of 54 mW/cm2, representing a satisfactory result when compared with Pt/C. The results reveal that the intermetallic nickel/cobalt silicide nanosphere decorated ceramic materials can have a promising future as efficient alternative electrocatalysts in electrochemical devices.

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“…The peaks of Co 2p 3/2 and Co 2p 1/2 at 778.7 and 793.9 eV with spin-orbit splitting of % 15 eV indicatet he existence of Co 3 + ,w hile the peaks at 781.2 and 796.2 eV demonstrating the presence of Co 2 + . [32] In addition, two weak satellitep eaks of Co 2 + at binding energies of 786.13 and 803.5 eV also can be observed. [33] For the S2 p spectrum in Figure5D, binding energiesa t1 62.1 and 163.5 eV correspond to the S2 p 3/2 and S2 p 1/2 ,r espectively,d emonstrating the presence of S 2À .T he peak at 165.3 eV is attributed to metal-sulfur bonds, andt he peak at 168.8 eV corresponds to a shakeup satellite.…”

Section: Resultsmentioning

confidence: 93%

Hierarchical FeCo₂S₄ Nanotube Arrays Deposited on 3D Carbon Foam as Binder‐free Electrodes for High‐performance Asymmetric Pseudocapacitors

Huang

Cui

Hua

et al. 2018

Chemistry An Asian Journal

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The ever-increasing global demand for green energy resources calls for more research attention on the development of cheap and efficient energy storage systems. Herein, we propose the rational design of a 3D carbon foam electrode deposited with perpendicularly oriented FeCo S nanotubes arrays (FeCo S /CMF) for high-performance asymmetric supercapacitors. In this work, the macroporous CMF served as conducting backbone not only to enhance the electrical conductivity of the composite, but also to promote the uniform growth of FeCo S nanotubes. Deposited hierarchical FeCo S nanotubes arrays with open hollow structures can afford numerous exposed electroactive sites for Faradaic redox reaction and provide short interior channels for fast electrolyte transmission. Due to these unique features, obtained 3D hierarchical FeCo S /CMF composite foam exhibits a high specific capacitance of 2430 F g (specific capacity of 337.5 mAh g ) at 1 A g , and excellent capacitance retention of 91 % after 5000 cycles at a high current density of 9 A g , which is superior to most of those previously reported binary metal sulfide-based electrodes. Moreover, asymmetric supercapacitor device assembled using the FeCo S /CMF as positive electrode also delivers a high energy density of 78.7 W h kg at a power density of 800.3 W kg . Therefore, this work provides a new strategy for the low-cost synthesis of 3D foam electrodes towards high-performance supercapacitor devices.

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An extremely facile route to Co2P encased in N,P-codoped carbon layers: Highly efficient bifunctional electrocatalysts for ORR and OER

Cited by 124 publications

References 50 publications

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Metal Silicide Nanosphere Decorated Carbon‐Rich Polymer‐Derived Ceramics: Bifunctional Electrocatalysts towards Oxygen and their Application in Anion Exchange Membrane Fuel Cells

Hierarchical FeCo₂S₄ Nanotube Arrays Deposited on 3D Carbon Foam as Binder‐free Electrodes for High‐performance Asymmetric Pseudocapacitors

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An extremely facile route to Co2P encased in N,P-codoped carbon layers: Highly efficient bifunctional electrocatalysts for ORR and OER

Cited by 124 publications

References 50 publications

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Metal Silicide Nanosphere Decorated Carbon‐Rich Polymer‐Derived Ceramics: Bifunctional Electrocatalysts towards Oxygen and their Application in Anion Exchange Membrane Fuel Cells

Hierarchical FeCo2S4 Nanotube Arrays Deposited on 3D Carbon Foam as Binder‐free Electrodes for High‐performance Asymmetric Pseudocapacitors

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Hierarchical FeCo₂S₄ Nanotube Arrays Deposited on 3D Carbon Foam as Binder‐free Electrodes for High‐performance Asymmetric Pseudocapacitors