Core-shell structured ZnCo/NC@MoS2 electrocatalysts for tunable hydrogen evolution reaction

Feng, Jianhui; Zhou, Hu; Chen, Danyang; Bian, Ting; Yuan, Aihua

doi:10.1016/j.electacta.2019.135445

Cited by 94 publications

(23 citation statements)

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“…After the pyrolysis of ZIF-67, the resultant Co/NC well inherits the cubic architecture ( Figure 2d), accompanied with a rough surface because of the decomposition and release of organic ligands in the framework during the thermal treatment. [12] The atomic percentage of Co species in the Co/NC sample is ∼ 10.1 at% calculated by EDS. TEM images ( Figure S3a, Figure S3c, Figure 2f) reveal that the Co/NC matrix clearly presents a porous structure, where most of Co NPs with a broad size distribution ranging from 10 to 30 nm are distributed and encapsulated in the carbon network.…”

Section: Resultsmentioning

confidence: 94%

“…[7][8][9][10][11] Very recently, our group has prepared MoS 2 nanosheets vertically aligned on ZnCo/NC dodecahedra, and the HER activities can be well adjusted by varying the Zn/Co ratio. [12] In spite of these advances on the fabrication of MoS 2 -based heterostructures, the activity and stability of catalysts need to be further improved and it's still in great demand to exploit more suitable matrixes for functionally decorating MoS 2 nanosheets.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Ultrathin MoS₂ Nanosheets on Co_xP/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution

et al. 2020

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Designing core‐shell heterostructures is essential for electrocatalytic hydrogen evolution reaction (HER). In this study, ultrathin MoS2 sheets are uniformly anchored on CoxP/nitrogen dual‐doped carbon nanocubes (CoxP/NC) through a template sacrificial method followed by a hydrothermal reaction. The resultant hybrid CoxP/NC@MoS2 possesses a core‐shell structure and superior catalytic activity to individual counterparts. The hybrid catalyst needs a low overpotential of 148 mV to drive the current density of 10 mA cm−2, together with an extremely small Tafel slope of 33 mV dec−1 and outstanding stability in acidic media. Most importantly, the best catalytic activity is achieved by coupling MoS2 nanosheets with the matrix CoxP/NC rather than Co/NC. The remarkably high HER activity of CoxP/NC@MoS2 mainly benefits from the core‐shell feature and strong synergistic interaction between CoxP/NC and MoS2. The present study inspires a continuous exploration of engineering MoS2 nanosheets on nanostructured metal phosphides for electrochemical applications.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Engineering Ultrathin MoS₂ Nanosheets on Co_xP/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution

et al. 2020

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“…In both cases combined surface, interface, and support engineering of materials lead to better performance of prepared materials in terms of activity, compared to Pt/C. In addition to PGM-free works, new reports with PGM-free supported catalysts that contain metallic phase(s) include carbon encapsulated Co nanoparticles [87]; cobalt and nitrogen-doped mesoporous graphitic carbon [88]; Au-NiS x heterostructures [89]; core-shell ZnCo/N-doped carbon@MoS 2 [90]; Co/CoP@N-doped carbon [91]; and Co, N, co-doped graphene [92]. It is important to note that non-noble transition metal nanoparticles are almost always oxidized to some extent, which when considering their electrocatalytic activity positions them between metal-based catalysts and (hydr)oxides, reviewed in next section.…”

Section: Supported Metallic Nanoparticlesmentioning

confidence: 99%

Hydrogen Evolution Reaction-From Single Crystal to Single Atom Catalysts

et al. 2020

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Hydrogen evolution reaction (HER) is one of the most important reactions in electrochemistry. This is not only because it is the simplest way to produce high purity hydrogen and the fact that it is the side reaction in many other technologies. HER actually shaped current electrochemistry because it was in focus of active research for so many years (and it still is). The number of catalysts investigated for HER is immense, and it is not possible to overview them all. In fact, it seems that the complexity of the field overcomes the complexity of HER. The aim of this review is to point out some of the latest developments in HER catalysis, current directions and some of the missing links between a single crystal, nanosized supported catalysts and recently emerging, single-atom catalysts for HER.

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“…In addition to PGM-free works, new reports with PGM-free supported catalysts that contain metallic phase(s) include carbon encapsulated Co nanoparticles [74], cobalt and nitrogen-doped mesoporous graphitic carbon [75], Au-NiSx heterostructures [76], core-shell ZnCo/N-doped carbon@MoS2 [77], Co/CoP@N-doped carbon [78], and Co, N, co-doped graphene [79]. It is important to note that non-noble transition metal nanoparticles are almost always oxidized to some extent which, when considering their electrocatalytic activity, positions them between metal-based catalysts and (hydr)oxides, reviewed in next section.…”

Section: Supported Metallic Nanoparticlesmentioning

confidence: 99%

Hydrogen Evolution Reaction - From Single Crystal to Single Atom Catalysts

Gutić¹,

Dobrota²,

Fako³

et al. 2020

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Hydrogen evolution reaction (HER) is one of the most important reaction in electrochemistry. This is not only because it is the simplest way to produce high purity hydrogen and the fact that it is the side reaction in many other technologies. HER actually shaped current electrochemistry because it was in focus of active research for so many years (and it still is). The number of catalysts investigated for HER is immense, and it is impossible to overview them all. In fact, it seems that the complexity of the field overcomes the complexity of HER. The aim of this review is to point out some of the latest developments in HER catalysis, current directions and some of the missing links between a single crystal, nanosized supported catalysts and, recently emerging, single atom catalysts for HER.3 of 36 HER at single crystal surfaces and bulk surfacesA crystalline solid can be considered as a series of mutually parallel lattice planes, arranged in a periodic way. Close to the surface, the spatial arrangement of the lattice planes, their crystallographic structure, as well as the dynamics of the constituent atoms may differ from the corresponding features in the bulk [1]. Most clean metals show the tendency to minimize their surface energy. One of the mechanisms is relaxation, the shift of one or more lattice planes located near to the surface, usually perpendicularly to the surface, so that the interlayer distance changes compared to the bulk lattice. The other one is reconstruction -change in equilibrium positions and bonding of surface atoms so that the projection of bulk unit cell to the given surface does not correspond to the surface unit cell. Different crystallographic planes (with different Miller indices) of the same metal exhibit unequal surface densities (number of atoms per surface area), and therefore undergo surface relaxation/reconstruction to different extents [2]. For example, Pt(100) has lower surface density compared to densely packed Pt(111) and therefore has a stronger tendency to relax/reconstruct. Since the main driving force for the mentioned surface modifications is the low coordination number (non-saturation) of surface atoms, it is obvious that atom/molecule adsorption on clean metal surfaces can have a significant effect on its surface structure, inducing relaxation/reconstruction changes. This is of huge importance for HER, as it involves adsorbed atomic hydrogen (Hads) as an intermediate. Additionally, in an electrochemical system, the electrode will be modified by adsorption of "spectator" species (ions/molecules from the electrolyte), so HER will not be taking place on clean metal surfaces, but rather on modified ones. Obviously, there is a complex dynamic interplay between the catalyst surface, reactants, intermediates, and electrolyte.According to the Sabatier principle, the interaction of the reaction reactants/intermediates with the catalyst has to be optimal in strength. If it is too weak, the reactants will not bind to the catalyst and the reaction will not be able to take place. In...

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Core-shell structured ZnCo/NC@MoS2 electrocatalysts for tunable hydrogen evolution reaction

Cited by 94 publications

References 55 publications

Engineering Ultrathin MoS₂ Nanosheets on Co_xP/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution

Engineering Ultrathin MoS₂ Nanosheets on Co_xP/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution

Hydrogen Evolution Reaction-From Single Crystal to Single Atom Catalysts

Hydrogen Evolution Reaction - From Single Crystal to Single Atom Catalysts

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Core-shell structured ZnCo/NC@MoS2 electrocatalysts for tunable hydrogen evolution reaction

Cited by 94 publications

References 55 publications

Engineering Ultrathin MoS2 Nanosheets on CoxP/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution

Engineering Ultrathin MoS2 Nanosheets on CoxP/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution

Hydrogen Evolution Reaction-From Single Crystal to Single Atom Catalysts

Hydrogen Evolution Reaction - From Single Crystal to Single Atom Catalysts

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Engineering Ultrathin MoS₂ Nanosheets on Co_xP/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution

Engineering Ultrathin MoS₂ Nanosheets on Co_xP/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution