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Chung DY, Park S, Lopes PP, Stamenkovic VR, Sung YE, Markovic NM, Strmcnik D. Electrokinetic Analysis of Poorly Conductive Electrocatalytic Materials. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00960] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dong Young Chung
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Subin Park
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, Seoul National University (SNU), Seoul 08826, Republic of Korea
| | - Pietro P. Lopes
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Vojislav R. Stamenkovic
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Yung-Eun Sung
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, Seoul National University (SNU), Seoul 08826, Republic of Korea
| | - Nenad M. Markovic
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Dusan Strmcnik
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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Nam DH, Kim JY, Kang S, Joo W, Lee SY, Seo H, Kim HG, Ahn IK, Lee GB, Choi M, Cho E, Kim M, Nam KT, Han S, Joo YC. Anion Extraction-Induced Polymorph Control of Transition Metal Dichalcogenides. NANO LETTERS 2019; 19:8644-8652. [PMID: 31671269 DOI: 10.1021/acs.nanolett.9b03240] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Controlled phase conversion in polymorphic transition metal dichalcogenides (TMDs) provides a new synthetic route for realizing tunable nanomaterials. Most conversion methods from the stable 2H to metastable 1T phase are limited to kinetically slow cation insertion into atomically thin layered TMDs for charge transfer from intercalated ions. Here, we report that anion extraction by the selective reaction between carbon monoxide (CO) and chalcogen atoms enables predictive and scalable TMD polymorph control. Sulfur vacancy, induced by anion extraction, is a key factor in molybdenum disulfide (MoS2) polymorph conversion without cation insertion. Thermodynamic MoS2-CO-CO2 ternary phase diagram offers a processing window for efficient sulfur vacancy formation with precisely controlled MoS2 structures from single layer to multilayer. To utilize our efficient phase conversion, we synthesize vertically stacked 1T-MoS2 layers in carbon nanofibers, which exhibit highly efficient hydrogen evolution reaction catalytic activity. Anion extraction induces the polymorph conversion of tungsten disulfide (WS2) from 2H to 1T. This reveals that our method can be utilized as a general polymorph control platform. The versatility of the gas-solid reaction-based polymorphic control will enable the engineering of metastable phases in 2D TMDs for further applications.
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Affiliation(s)
- Dae-Hyun Nam
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Ji-Yong Kim
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Sungwoo Kang
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Wonhyo Joo
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Seung-Yong Lee
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Hongmin Seo
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Hyoung Gyun Kim
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - In-Kyoung Ahn
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Gi-Baek Lee
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Minjeong Choi
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Eunsoo Cho
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Miyoung Kim
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
- Research Institute of Advanced Materials (RIAM) , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
- Research Institute of Advanced Materials (RIAM) , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Seungwu Han
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
- Research Institute of Advanced Materials (RIAM) , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Young-Chang Joo
- Department of Materials Science and Engineering , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
- Research Institute of Advanced Materials (RIAM) , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea
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Jia X, Ren H, Hu H, Song YF. 3D Carbon Foam Supported Edge-Rich N-Doped MoS 2 Nanoflakes for Enhanced Electrocatalytic Hydrogen Evolution. Chemistry 2019; 26:4150-4156. [PMID: 31750955 DOI: 10.1002/chem.201904669] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Revised: 11/15/2019] [Indexed: 11/11/2022]
Abstract
Molybdenum disulfide (MoS2 ) is one of the most promising alternatives to the Pt-based electrocatalysts for the hydrogen evolution reaction (HER). However, its performance is currently limited by insufficient active edge sites and poor electron transport. Hence, enormous efforts have been devoted to constructing more active edge sites and improving conductivity to obtain enhanced electrocatalytic performance. Herein, the 3D carbon foam (denoted as CF) supported edge-rich N-doped MoS2 nanoflakes were successfully fabricated by using the commercially available polyurethane foam (PU) as the 3D substrate and PMo12 O40 3- clusters (denoted as PMo12 ) as the Mo source through redox polymerization, followed by sulfurization. Owing to the uniform distribution of nanoscale Mo sources and 3D carbon foam substrate, the as-prepared MoS2 -CF composite possessed well-exposed active edge sites and enhanced electrical conductivity. Systematic investigation demonstrated that the MoS2 -CF composite showed high HER performance with a low overpotential of 92 mV in 1.0 m KOH and 155 mV in 0.5 m H2 SO4 at a current density of 10 mA cm-2 . This work offers a new pathway for the rational design of MoS2 -based HER electrocatalysts.
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Affiliation(s)
- Xueying Jia
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Hongyuan Ren
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Hanbin Hu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Yu-Fei Song
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
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Wang Y, Wang K, Zhang C, Zhu J, Xu J, Liu T. Solvent-Exchange Strategy toward Aqueous Dispersible MoS 2 Nanosheets and Their Nitrogen-Rich Carbon Sphere Nanocomposites for Efficient Lithium/Sodium Ion Storage. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1903816. [PMID: 31532922 DOI: 10.1002/smll.201903816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 09/03/2019] [Indexed: 06/10/2023]
Abstract
Major challenges in developing 2D transition-metal disulfides (TMDs) as anode materials for lithium/sodium ion batteries (LIBs/SIBs) lie in rational design and targeted synthesis of TMD-based nanocomposite structures with precisely controlled ion and electron transport. Herein, a general and scalable solvent-exchange strategy is presented for uniform dispersion of few-layer MoS2 (f-MoS2 ) from high-boiling-point solvents (N-methyl-2-pyrrolidone (NMP), N,N-dimethyl formaldehyde (DMF), etc.) into low-boiling-point solvents (water, ethanol, etc.). The solvent-exchange strategy dramatically simplifies high-yield production of dispersible MoS2 nanosheets as well as facilitates subsequent decoration of MoS2 for various applications. As a demonstration, MoS2 -decorated nitrogen-rich carbon spheres (MoS2 -NCS) are prepared via in situ growth of polypyrrole and subsequent pyrolysis. Benefiting from its ultrathin feature, largely exposed active surface, highly conductive framework and excellent structural integrity, the 2D core-shell architecture of MoS2 -NCS exhibits an outstanding reversible capacity and excellent cycling performance, achieving high initial discharge capacity of 1087.5 and 508.6 mA h g-1 at 0.1 A g-1 , capacity retentions of 95.6% and 94.2% after 500 and 250 charge/discharge cycles at 1 A g-1 , for lithium/sodium ion storages, respectively.
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Affiliation(s)
- Yufeng Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Kai Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Chao Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Jixin Zhu
- Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an, 710072, P. R. China
| | - Jingsan Xu
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Tianxi Liu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
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Li J, Cheng Y, Zhang J, Fu J, Yan W, Xu Q. Confining Pd Nanoparticles and Atomically Dispersed Pd into Defective MoO 3 Nanosheet for Enhancing Electro- and Photocatalytic Hydrogen Evolution Performances. ACS APPLIED MATERIALS & INTERFACES 2019; 11:27798-27804. [PMID: 31305977 DOI: 10.1021/acsami.9b07469] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Interface engineering of two-dimensional (2D) transition-metal composites for activating plane and edge sites is a significant yet step challenging in boosting their performance for hydrogen evolution reaction (HER). Herein, two-dimensional (2D) MoO3 with petal-shaped nanosheets confining Pd nanoparticles (Pd@MoO3 heterostructure) was prepared via an efficient solvothermal and subsequently hydrogen reduction processes. The atomically dispersed Pd-substituted sites in the interface of Pd nanoparticles and 2D MoO3 lattices significantly play an important role in enhancing the electrocatalytic and photocatalytic performances of the Pd@MoO3 heterostructure. As a result, the Pd@MoO3 heterostructure exhibits a high HER catalytic activity with an overpotential (η) of 71 mV to achieve a current density of 10 mA cm-2 and an extremely low Tafel slope of 42.8 mV dec-1 in 0.5 M H2SO4 solution. Furthermore, the photoresponse of the Pd@MoO3 heterostructure is about 3 times higher than that of the MoO3 nanosheets. This work highlighted a strategy of interface engineering for highly efficient cost-effective catalyst for hydrogen evolution by electric and solar energy conversion.
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Affiliation(s)
- Jin Li
- College of Materials Science and Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Yong Cheng
- College of Materials Science and Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Jianan Zhang
- College of Materials Science and Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Jianwei Fu
- College of Materials Science and Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Wenfu Yan
- State Key Laboratory of Inorganic Synthesis and Preparation , Jilin University , Changchun 130012 , P. R. China
| | - Qun Xu
- College of Materials Science and Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
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Optimization of the Hydrogen‐Adsorption Free Energy of Ru‐Based Catalysts towards High‐Efficiency Hydrogen Evolution Reaction at all pH. Chemistry 2019; 25:8579-8584. [DOI: 10.1002/chem.201900790] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 04/18/2019] [Indexed: 12/14/2022]
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Active Pore-Edge Engineering of Single-Layer Niobium Diselenide Porous Nanosheets Electrode for Hydrogen Evolution. NANOMATERIALS 2019; 9:nano9050751. [PMID: 31100855 PMCID: PMC6567302 DOI: 10.3390/nano9050751] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/29/2019] [Accepted: 05/01/2019] [Indexed: 12/19/2022]
Abstract
Two-dimensional transition-metal dichalcogenides (TMDs) possess interesting catalytic properties for the electrochemical-assisted hydrogen-evolution reaction (HER). We used niobium diselenide (NbSe2) as a representative TMD, and prepared single-layer NbSe2 porous nanosheets (PNS) by a double-sonication liquid-phase exfoliation, with H2O2 as a pore-forming agent. The single-layer NbSe2 PNS were drop-cast on carbon foam (CF) to fabricate a three-dimensional robust NbSe2 PNS/CF electrode. The NbSe2 PNS/CF electrode exhibits a high current density of -50 mA cm-2 with an overpotential of 148 mV and a Tafel slope of 75.8 eV dec-1 for the HER process. Little deactivation is detected in continuous CV testing up to 20,000 cycles, which suggests that this novel NbSe2 PNS/CF is a promising catalytic electrode in the HER application. The porous structure of single-layer NbSe2 nanosheets can enhance the electrochemical performance compared with that of pore-free NbSe2 nanosheets. These findings illustrate that the single-layer NbSe2 PNS is a potential electrocatalytic material for HER. More importantly, the electrochemical performance of the NbSe2 PNS/CF expands the use of two-dimensional TMDs in electrocatalysis-related fields.
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Batzill M. Mirror twin grain boundaries in molybdenum dichalcogenides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:493001. [PMID: 30457114 DOI: 10.1088/1361-648x/aae9cf] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Mirror twin grain boundaries (MTBs) exist at the interface between two grains of 60° rotated hexagonal transition metal dichalcogenides (TMDC). These grain boundaries form a regular atomic structure that extends in one dimension and thus may be described as a one-dimensional (1D) lattice embedded in the 2D TMDC. In this review, the different atomic structures and compositions of these MTBs are discussed. The obvious formation of MTBs is by coalescence of two twinned grains. In addition, however, in MoSe2 and MoTe2 a different formation mechanism has been revealed for the formation of Mo-rich MTBs. It has been shown that excess Mo can be incorporated into the TMDC lattices. These excess Mo atoms can then reorganize into closed, triangular MTB-loops that can grow in size by adding more Mo atoms to them. This mechanism allows the formation of dense MTB networks in MoSe2 and MoTe2. Such MTB networks have been observed in samples grown by molecular beam epitaxy (MBE) and consequently their presence needs to be considered in understanding the properties of MBE grown MoSe2 and MoTe2. Density functional theory as well as photoemission spectroscopy of MTB networks have shown that MTBs exhibit dispersing 1D-bands that intersect the Fermi-level, thus suggesting that these are 1D electron systems. Consequently, experimental data have been interpreted to reveal a charge density wave (or Peierls) instability, as well as a Tomonaga-Luttinger liquid behavior for electrons confined in 1D. We discuss these observations and the controversies that remain in the interpretation of some data. The metallic properties of the MTBs and their formation in dense networks also sparked the potential use of such crystal modifications for making metallic contacts to MoTe2 or MoSe2. Moreover, these crystal modifications may also boost the catalytic properties of these materials.
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Affiliation(s)
- Matthias Batzill
- Department of Physics, University of South Florida, Tampa, FL 33620, United States of America
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