Ultrafine Co nanodots embedded in N-doped carbon nanotubes grafted on hexagonal VN for highly efficient overall water splitting

Huang, Chao; Wu, Donghai; Qin, Ping; Ding, Kang; Pi, Chaoran; Ruan, Qingdong; Song, Hao; Gao, Biao; Chen, Houyang; Chu, Paul K.

doi:10.1016/j.nanoen.2020.104788

Cited by 76 publications

(42 citation statements)

References 39 publications

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“…Besides the characteristic peaks of CoSe 2 , the other peaks can be assigned to the planes of CoNi LDH (JCPDS 33-0429). [30,31] Simultaneously, the 2b), corresponding to Co 2p 3/2 and Co 2p 1/2 of Co-Se bond, [32,33] while the peaks at 779.1 and 794.3 eV of Co 2p 3/2 and Co 2p 1/2 belong to Co-O bond for CoNi LDH. Obviously, the binding energies of Co 2p 3/2 and Co 2p 1/2 for B-CoSe 2 @CoNi LDH are higher than that of B-CoSe 2 , but lower than that of CoNi LDH.…”

Section: Resultsmentioning

confidence: 89%

“…The surface composition of B‐CoSe 2 @CoNi LDH HNA was then investigated via X‐ray photoelectron spectrometer (XPS) and X‐ray absorption fine structure (XAFS) characterization. The Co 2p spectrum of B‐CoSe 2 deconvolutes with two peaks at 778.4 and 793.3 eV along with two satellite peaks at 783.1 and 799.3 eV (Figure 2b), corresponding to Co 2p 3/2 and Co 2p 1/2 of Co–Se bond, [ 32,33 ] while the peaks at 779.1 and 794.3 eV of Co 2p 3/2 and Co 2p 1/2 belong to Co–O bond for CoNi LDH. Obviously, the binding energies of Co 2p 3/2 and Co 2p 1/2 for B‐CoSe 2 @CoNi LDH are higher than that of B‐CoSe 2 , but lower than that of CoNi LDH.…”

Section: Resultsmentioning

confidence: 99%

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Heterointerface Engineering of Hierarchically Assembling Layered Double Hydroxides on Cobalt Selenide as Efficient Trifunctional Electrocatalysts for Water Splitting and Zinc‐Air Battery

et al. 2022

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Engineering of structure and composition is essential but still challenging for electrocatalytic activity modulation. Herein, hybrid nanostructured arrays (HNA) with branched and aligned structures constructed by cobalt selenide (CoSe2) nanotube arrays vertically oriented on carbon cloth with CoNi layered double hydroxide (CoSe2@CoNi LDH HNA) are synthesized by a hydrothermal‐selenization‐hybridization strategy. The branched and hollow structure, as well as the heterointerface between CoSe2 and CoNi LDH guarantee structural stability and sufficient exposure of the surface active sites. More importantly, the strong interaction at the interface can effectively modulate the electronic structure of hybrids through the charge transfer and then improves the reaction kinetics. The resulting branched CoSe2@CoNi LDH HNA as trifunctional catalyst exhibits enhanced electrocatalytic performance toward oxygen evolution/reduction and hydrogen evolution reaction. Consequently, the branched CoSe2@CoNi LDH HNA exhibits low overpotential of 1.58 V at 10 mA cm−2 for water splitting and superior cycling stability (70 h) for rechargeable flexible Zn‐air battery. Theoretical calculations reveal that the construction of heterostructure can effectively lower the reaction barrier as well as improve electrical conductivity, consequently favoring the enhanced electrochemical performance. This work concerning engineering heterostructure and topography‐performance relationship can provide new guidance for the development of multifunctional electrocatalysts.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Heterointerface Engineering of Hierarchically Assembling Layered Double Hydroxides on Cobalt Selenide as Efficient Trifunctional Electrocatalysts for Water Splitting and Zinc‐Air Battery

et al. 2022

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“…Vanadium (V)‐based electrocatalysts (such as VS 2 , [ 10,11 ] VN, [ 12–15 ] VP, [ 16 ] and V 2 O 3 [ 17–19 ] ) are conducive for its application in catalysis fields, because of its more valence state diversity. Catalytic activities of the vanadium‐based electrocatalyst are closely related with its electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Maximized Schottky Effect: The Ultrafine V₂O₃/Ni Heterojunctions Repeatedly Arranging on Monolayer Nanosheets for Efficient and Stable Water‐to‐Hydrogen Conversion

Zhang

Liu

et al. 2021

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electrochemical water splitting is an advocated way to meet the requirement for future fuel applications. [3] But its shortcomings, such as the considerable overpotential and sluggish anodic oxygen evolution reaction (OER) kinetics, still remain. To give rise to energy-saving H 2 production, using more readily oxidized molecules to replace the formidable OER may be a feasible solution to overcome this limitation. [4,5] Following this strategy, several molecules such as glycerol, [6] urea, [2,7] hydrazine, [8] have been recently developed. Using urea electrolysis instead of water splitting can not only offer a prospect of wastewater purification, but also change the thermodynamic potential from 1.23 to just 0.37 V. [5] However, the complex 6e − transfer process in the half-reaction causes the urea oxidation reaction (UOR) to suffer from inherent kinetic retardation. [9] Therefore, to promote the anodic urea oxidation process, highly efficient catalysts are actually required to boost the intrinsically sluggish UOR kinetics. Vanadium (V)-based electrocatalysts (such as VS 2 , [10,11] VN, [12-15] VP, [16] and V 2 O 3 [17-19]) are conducive for its application in catalysis fields, because of its more valence state diversity. Catalytic activities of the vanadium-based electrocatalyst are closely related with its electronic structure. [16] Thus, it is widely accepted that adjusting the behavior of electrons and phonons more precisely is the key to optimizing the catalyst performance. [16] Schottky heterojunction, formed at the semiconductor metal interface, could generate the built-in electric field and enhance the charge transportation as well as separation. [20-22] To balance the differences of Fermi levels between semiconductor and metal sides, charge flow would spontaneously transfer across the interface, leading to form the stable local nucleophilic/electro region. [20] Hence, preparing ingenious V-based Schottky catalyst is the proof-of-concept way to simultaneously promote the hydrogen evolution reaction (HER) and UOR activities. For example, Fu et al. reported that construction of heterointerfaces of Ni 3 NVN and Ni 2 PVP 2 can improve the HER and OER activities significantly. [16] However, most of the reported works only focus on the construction The Mott-Schottky heterojunction formed at the interface of ultrafine metallic Ni and semiconducting V 2 O 3 nanoparticles is constructed, and the heterojunctions are "knitted" into the tulle-like monolayer nanosheets on nickel foam (NF). The greatly reduced particle sizes of both Ni and V 2 O 3 on the Mott-Schottky heterojunction highly enhance the number of Schottky heterojunctions per unit area of the materials. Moreover, arranging the heterojunctions into the monolayer nanosheets makes the heterojunctions repeat and expose to the electrolyte sufficiently. The Schottky heterojunctions are like countless selfpowered charge transfer workstations embedded in the tulle-like monolayer nanosheets, promoting maximum of the materials to participate into the electron trans...

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“…Engineering heterojunction is considered as a feasible approach to regulate the electronic structure and optimize the absorption of active species [26][27][28]. Particularly, the hybridization of early-transition metals (W, Mo, V) with Co-based composites can promote the HER kinetics owing to the synergistic effect of the two components [29][30][31]. Vanadium (V) has rich reserves, low price and atomic radius close to Co [32].…”

Section: Introductionmentioning

confidence: 99%

One-dimensional CO9S8-V3S4 heterojunctions as bifunctional electrocatalysts for highly efficient overall water splitting

et al. 2021

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responds to the enhancement of oxygen evolution reaction (OER) activity. Co 9 S 8 -V 3 S 4 /CC exhibits low overpotentials of 85 and 232 mV at 10 mA cm −2 and small Tafel slopes of 51 and 59 mV dec −1 for HER and OER, respectively. Especially, the electrolyzer with Co 9 S 8 -V 3 S 4 /CC as both the anode and cathode requires low onset voltage of 1.35 V and cell voltage of 1.53 V at 10 mA cm −2 and exhibits high Faradaic efficiencies and robust stability. It can be driven by a solar cell (1.53 V) for continuous production of hydrogen and oxygen. This study highlights the design of 1D sulfide heterojunction in pursuit of highly efficient electrocatalysts for overall water splitting.

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Ultrafine Co nanodots embedded in N-doped carbon nanotubes grafted on hexagonal VN for highly efficient overall water splitting

Cited by 76 publications

References 39 publications

Heterointerface Engineering of Hierarchically Assembling Layered Double Hydroxides on Cobalt Selenide as Efficient Trifunctional Electrocatalysts for Water Splitting and Zinc‐Air Battery

Heterointerface Engineering of Hierarchically Assembling Layered Double Hydroxides on Cobalt Selenide as Efficient Trifunctional Electrocatalysts for Water Splitting and Zinc‐Air Battery

Maximized Schottky Effect: The Ultrafine V₂O₃/Ni Heterojunctions Repeatedly Arranging on Monolayer Nanosheets for Efficient and Stable Water‐to‐Hydrogen Conversion

One-dimensional CO9S8-V3S4 heterojunctions as bifunctional electrocatalysts for highly efficient overall water splitting

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Ultrafine Co nanodots embedded in N-doped carbon nanotubes grafted on hexagonal VN for highly efficient overall water splitting

Cited by 76 publications

References 39 publications

Heterointerface Engineering of Hierarchically Assembling Layered Double Hydroxides on Cobalt Selenide as Efficient Trifunctional Electrocatalysts for Water Splitting and Zinc‐Air Battery

Heterointerface Engineering of Hierarchically Assembling Layered Double Hydroxides on Cobalt Selenide as Efficient Trifunctional Electrocatalysts for Water Splitting and Zinc‐Air Battery

Maximized Schottky Effect: The Ultrafine V2O3/Ni Heterojunctions Repeatedly Arranging on Monolayer Nanosheets for Efficient and Stable Water‐to‐Hydrogen Conversion

One-dimensional CO9S8-V3S4 heterojunctions as bifunctional electrocatalysts for highly efficient overall water splitting

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Maximized Schottky Effect: The Ultrafine V₂O₃/Ni Heterojunctions Repeatedly Arranging on Monolayer Nanosheets for Efficient and Stable Water‐to‐Hydrogen Conversion