Optimally arranged TiO2@MoS2 heterostructures with effectively induced built-in electric field for high-performance lithium-sulfur batteries

Lee, Jeongyoub; Choi, Changhoon; Park, Jung Been; Yu, Seungho; Ha, Jinho; Lee, Hyungsoo; Jang, Gyumin; Park, Young Sun; Yun, Juwon; Im, Hayoung; Moon, Subin; Lee, Soo Bin; Choi, Jung Il; Kim, Dong-Wan; Moon, Jooho

doi:10.1016/j.jechem.2023.04.016

Cited by 35 publications

(10 citation statements)

References 74 publications

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“…Different from the van der Waals force of carbon materials, the adsorption of LiPSs by TiO 2 -based materials was due to chemical interaction. Surprisingly, TiO 2 –Ru not only inherited the LiPSs affinity of TiO 2 but also showed stronger trapping performance, which might be attributed to the internal strong electric field formed by its heterogeneous interface, and the electron redistribution caused more charge transfer of LiPSs on TiO 2 –Ru. , …”

Section: Resultsmentioning

confidence: 97%

“…Surprisingly, TiO 2 −Ru not only inherited the LiPSs affinity of TiO 2 but also showed stronger trapping performance, which might be attributed to the internal strong electric field formed by its heterogeneous interface, and the electron redistribution caused more charge transfer of LiPSs on TiO 2 −Ru. 23,24 XPS further analyzed the electronic interaction of LiPSs upon contact with TiO 2 −Ru (Figure 2d). For Ti 2p orbital, the two predominant characteristic peaks at ∼458.3 and ∼464.0 eV were attributed to Ti 2p 3/2 and Ti 2p 1/2 signals by spin− orbit splitting, indicating Ti 4+ in the Ti−O bond.…”

Section: Resultsmentioning

confidence: 99%

“…The capacity suddenly decreased after ∼600 cycles, which might be due to the deactivation of the Li anode. , The corresponding capacity loss was only ∼0.015% per cycle, which was lower than most previous TiO 2 -based sulfur-positive reports (Figure S12). ,− …”

Section: Resultsmentioning

confidence: 99%

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Interfacial Engineering of Ru Nanocluster-Modified TiO₂ Nanotube-Assisted Regulation of Lithium Polysulfide Reactions

Pu,

Zhu,

Chang

et al. 2023

Inorg. Chem.

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The inhibition of lithium polysulfide (LiPS) diffusion and the acceleration of reaction kinetics are two major challenges for the practical application of lithium−sulfur (Li−S) batteries. Herein, through an interface engineering strategy, a multifunctional sulfur host based on Ru nanocluster-modified TiO 2 nanotubes (TiO 2 −Ru) was designed. The TiO 2 −Ru interface field effect, combined with the hollow nanotube structure and the strong chemical action of TiO 2 , enhanced the LiPS trapping ability and inhibited the "shuttle effect". Furthermore, the high catalytic activity of Ru nanoclusters reduced the energy barrier of multistep LiPS reactions, thus speeding up the electrode kinetics. As a result, the TiO 2 −Ru-based composite sulfur cathode delivered excellent electrochemical performance, including an extremely low capacity loss of ∼0.015% per cycle and an increased areal capacity of ∼6.1 mAh cm −2 at 4.8 mg cm −2 . This work contributes to a better sulfur cathode design from insights into morphology and phase interface engineering.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Interfacial Engineering of Ru Nanocluster-Modified TiO₂ Nanotube-Assisted Regulation of Lithium Polysulfide Reactions

Pu,

Zhu,

Chang

et al. 2023

Inorg. Chem.

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“…25,26 According to reports, the directional migration of electrons between the two phase interfaces creates a built-in electric field, which can significantly boost the conversion efficiency of LiPSs. 27,28 This phenomenon is crucial in enhancing the redox kinetics of S species and maximizing the use of active substances. When compared to t-C 3 N 4 , MoO 2 /t-C 3 N 4 is able to reduce the energy barrier of the redox process of LiPSs and shows excellent bidirectional catalysis for the conversion of LiPSs and also has a positive effect on accelerating the migration of lithium ions.…”

Section: Introductionmentioning

confidence: 99%

“…The relatively high Mo 4d band in MoO 2 leads to increased conductivity . Meanwhile, MoO 2 also possesses distinctive metallic characteristics (such as thermal and chemical stability) that set it apart from other metal oxides. − After successful preparation of MoO 2 /t-C 3 N 4 heterostructures, the variation in work function creates a circumstance where electrons transfer from the t-C 3 N 4 side (4.4 eV) to the MoO 2 side (5.12 eV). , According to reports, the directional migration of electrons between the two phase interfaces creates a built-in electric field, which can significantly boost the conversion efficiency of LiPSs. , This phenomenon is crucial in enhancing the redox kinetics of S species and maximizing the use of active substances. When compared to t-C 3 N 4 , MoO 2 /t-C 3 N 4 is able to reduce the energy barrier of the redox process of LiPSs and shows excellent bidirectional catalysis for the conversion of LiPSs and also has a positive effect on accelerating the migration of lithium ions.…”

Section: Introductionmentioning

confidence: 99%

MoO₂/t-C₃N₄ Heterogeneous Materials with Bidirectional Catalysis for the Rapid Conversion of S Species in Li–S Batteries

He,

Luo,

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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Li−S batteries have drawn a lot of attention for their high theoretical specific capacity and significant economic benefits. However, the shuttle effect of polysulfides prevents them from being used widely. To tackle this difficulty, a heterogeneous structure based on tubular carbon nitride with evenly dispersed molybdenum dioxide nanoparticles (MoO 2 /t-C 3 N 4 ) as the S host is constructed in this work. As a polar material with a large specific surface area, MoO 2 /t-C 3 N 4 has a strong anchoring effect on polysulfide. Additionally, the heterogeneous material has excellent bidirectional catalytic ability for the redox process of S species based on the action of the built-in electric field formed by electron directional transfer. Not only does it improve the reaction kinetics of the redox process of the polysulfides but it also prevents polysulfides from accumulating on the surface of the modified material and deactivating it, further improving the utilization of the active material. Thus, MoO 2 /t-C 3 N 4 /S shows the high initial-discharge specific capacity of 812.7 mAh g −1 at the current density of 5C, and the Coulombic efficiency is maintained at more than 95% after 400 charge/discharge cycles. Moreover, MoO 2 /t-C 3 N 4 /S achieved a capacity retention of 89% after 100 cycles at the current density of 0.1C under the high S loading. Therefore, the research results of this work provide a trustworthy reference for the future commercial application of Li−S batteries.

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Built‐In Electric Field Enhancement Strategy Induced by Cross‐Dimensional Nano‐Heterointerface Design for Electromagnetic Wave Absorption

Li,

Wang,

et al. 2024

Adv Funct Materials

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Nano‐heterointerface engineering has been demonstrated to influence interfacial polarization by expanding the interface surface area and constructing a built‐in electric field (BEF), thus regulating electromagnetic (EM) wave absorption. However, the dielectric‐responsive mechanism of the BEF needs further exploration to enhance the comprehensive understanding of interfacial polarization, particularly in terms of quantifying and optimizing the BEF strength. Herein, a “1D expanded 2D structure” carbon matrix is designed, and semiconductor ZnIn2S4 (ZIS) is introduced to construct a carbon/ZIS heterostructure. The cross‐dimensional nano‐heterointerface design increases interface coupling sites by expanding the interface surface area and induces an increase in the Fermi level difference on both sides of the interface to modulate the distribution of interface charges, thereby strengthening the BEF at the interface. The synergistic effect leads to excellent EM absorption performance (minimum reflection coefficient RCmin = −67.4 dB, effective absorption bandwidth EAB = 6.0 GHz) of carbon/ZIS heterostructure. This work introduces a general modification model for enhancing interfacial polarization and inspires the development of new strategies for EM functional materials with unique electronic behaviors through heterointerface engineering.

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Optimally arranged TiO2@MoS2 heterostructures with effectively induced built-in electric field for high-performance lithium-sulfur batteries

Cited by 35 publications

References 74 publications

Interfacial Engineering of Ru Nanocluster-Modified TiO₂ Nanotube-Assisted Regulation of Lithium Polysulfide Reactions

Interfacial Engineering of Ru Nanocluster-Modified TiO₂ Nanotube-Assisted Regulation of Lithium Polysulfide Reactions

MoO₂/t-C₃N₄ Heterogeneous Materials with Bidirectional Catalysis for the Rapid Conversion of S Species in Li–S Batteries

Built‐In Electric Field Enhancement Strategy Induced by Cross‐Dimensional Nano‐Heterointerface Design for Electromagnetic Wave Absorption

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Optimally arranged TiO2@MoS2 heterostructures with effectively induced built-in electric field for high-performance lithium-sulfur batteries

Cited by 35 publications

References 74 publications

Interfacial Engineering of Ru Nanocluster-Modified TiO2 Nanotube-Assisted Regulation of Lithium Polysulfide Reactions

Interfacial Engineering of Ru Nanocluster-Modified TiO2 Nanotube-Assisted Regulation of Lithium Polysulfide Reactions

MoO2/t-C3N4 Heterogeneous Materials with Bidirectional Catalysis for the Rapid Conversion of S Species in Li–S Batteries

Built‐In Electric Field Enhancement Strategy Induced by Cross‐Dimensional Nano‐Heterointerface Design for Electromagnetic Wave Absorption

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Interfacial Engineering of Ru Nanocluster-Modified TiO₂ Nanotube-Assisted Regulation of Lithium Polysulfide Reactions

Interfacial Engineering of Ru Nanocluster-Modified TiO₂ Nanotube-Assisted Regulation of Lithium Polysulfide Reactions

MoO₂/t-C₃N₄ Heterogeneous Materials with Bidirectional Catalysis for the Rapid Conversion of S Species in Li–S Batteries