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Guo Y, Wang S, Zhang H, Guo H, He M, Ruan K, Yu Z, Wang GS, Qiu H, Gu J. Consistent Thermal Conductivities of Spring-Like Structured Polydimethylsiloxane Composites under Large Deformation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2404648. [PMID: 38970529 DOI: 10.1002/adma.202404648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2024] [Revised: 06/30/2024] [Indexed: 07/08/2024]
Abstract
Flexible and highly thermally conductive materials with consistent thermal conductivity (λ) during large deformation are urgently required to address the heat accumulation in flexible electronics. In this study, spring-like thermal conduction pathways of silver nanowire (S-AgNW) fabricated by 3D printing are compounded with polydimethylsiloxane (PDMS) to prepare S-AgNW/PDMS composites with excellent and consistent λ during deformation. The S-AgNW/PDMS composites exhibit a λ of 7.63 W m-1 K-1 at an AgNW amount of 20 vol%, which is ≈42 times that of PDMS (0.18 W m-1 K-1) and higher than that of AgNW/PDMS composites with the same amount and random dispersion of AgNW (R-AgNW/PDMS) (5.37 W m-1 K-1). Variations in the λ of 20 vol% S-AgNW/PDMS composites are less than 2% under a deformation of 200% elongation, 50% compression, or 180° bending, which benefits from the large deformation characteristics of S-AgNW. The heat-transfer coefficient (0.29 W cm-2 K-1) of 20 vol% S-AgNW/PDMS composites is ≈1.3 times that of the 20 vol% R-AgNW/PDMS composites, which reduces the temperature of a full-stressed central processing unit by 6.8 °C compared to that using the 20 vol% R-AgNW/PDMS composites as a thermally conductive material in the central processing unit.
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Affiliation(s)
- Yongqiang Guo
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Shuangshuang Wang
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Haitian Zhang
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Hua Guo
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - MuKun He
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Kunpeng Ruan
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Ze Yu
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Guang-Sheng Wang
- School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Hua Qiu
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Junwei Gu
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
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2
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Yang TY, Gu SW, Zhang YX, Zheng F, Kong D, Dunin-Borkowski RE, Wu D, Ge ZH, Feng J, Jin L. Pseudopolymorphic Phase Engineering for Improved Thermoelectric Performance in Copper Sulfides. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2308353. [PMID: 37903494 DOI: 10.1002/adma.202308353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 10/26/2023] [Indexed: 11/01/2023]
Abstract
Polymorphism (and its extended form - pseudopolymorphism) in solids is ubiquitous in mineralogy, crystallography, chemistry/biochemistry, materials science, and the pharmaceutical industries. Despite the difficulty of controlling (pseudo-)polymorphism, the realization of specific (pseudo-)polymorphic phases and associated boundary structures is an efficient route to enhance material performance for energy conversion and electromechanical applications. Here, this work applies the pseudopolymorphic phase (PP) concept to a thermoelectric copper sulfide, Cu2- x S (x ≤ 0.25), via CuBr2 doping. A peak ZT value of 1.25 is obtained at 773 K in Cu1.8 S + 3 wt% CuBr2 , which is 2.3 times higher than that of a pristine Cu1.8 S sample. Atomic-resolution scanning transmission electron microscopy confirms the transformation of pristine Cu1.8 S low digenite into PP-engineered high digenite, as well as the formation of (semi-)coherent interfaces between different PPs, which is expected to enhance phonon scattering. The results demonstrate that PP engineering is an effective approach for achieving improved thermoelectric performance in Cu-S compounds. It is also expected to be useful in other materials.
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Affiliation(s)
- Tian-Yu Yang
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Shi-Wei Gu
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Yi-Xin Zhang
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Fengshan Zheng
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
- Electron Microscopy Center, South China University of Technology, Guangzhou, 511442, China
| | - Deli Kong
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
| | - Rafal E Dunin-Borkowski
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
| | - Di Wu
- Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China
| | - Zhen-Hua Ge
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Jing Feng
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Lei Jin
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
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Liu G, Sun Z, Shi X, Wang X, Shao L, Liang Y, Lu X, Liu J, Guo Z. 2D-Layer-Structure Bi to Quasi-1D-Structure NiBi 3 : Structural Dimensionality Reduction to Superior Sodium and Potassium Ion Storage. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2305551. [PMID: 37549373 DOI: 10.1002/adma.202305551] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 07/27/2023] [Indexed: 08/09/2023]
Abstract
Layer-structured bismuth (Bi) is an attractive anode for Na-ion and K-ion batteries due to its large volumetric capacity and suitable redox potentials. However, the cycling stability and rate capability of the Bi anode are restricted by the large volume expansion and sluggish Na/K-storage kinetics. Herein, a structural dimensionality reduction strategy is proposed and developed by converting 2D-layer-structured Bi into a quasi-1D structured NiBi3 with enhanced reaction kinetics and reversibility to realize high-rate and stable cycling performance for Na/K-ion storage. As a proof of concept, the quasi-1D intermetallic NiBi3 with low formation energy, metallic conductivity, and 3D Na/K-ion diffusion pathways delivers outstanding capacity retention of 94.1% (332 mAh g-1 ) after 15 000 cycles for Na-ion storage, and high initial coulombic efficiency of 93.4% with improved capacity retention for K-ion storage. Moreover, investigations on the highly reversible Na/K-storage reaction mechanisms and cycling-driven morphology reconstruction further reveal the origins of the high reversibility and the accommodation to volume expansion. The finding of this work provides a new strategy for high-performance anode design by structural dimensionality manipulation and cycling-driven morphology reconstruction.
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Affiliation(s)
- Guoping Liu
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
| | - Zhipeng Sun
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
| | - Xiaoyan Shi
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
| | - Xinying Wang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
| | - Lianyi Shao
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yaohua Liang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
| | - Xiaoyi Lu
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
| | - Jianwen Liu
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China
| | - Zaiping Guo
- School of Chemical Engineering and Advanced Materials, University of Adelaide, Adelaide, South Australia, 5005, Australia
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Mei J, Shang J, Zhang C, Qi D, Kou L, Wijerathne B, Hu C, Liao T, MacLeod J, Sun Z. MAX-phase Derived Tin Diselenide for 2D/2D Heterostructures with Ultralow Surface/Interface Transport Barriers toward Li-/Na-ions Storage. SMALL METHODS 2022; 6:e2200658. [PMID: 35802910 DOI: 10.1002/smtd.202200658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/15/2022] [Indexed: 06/15/2023]
Abstract
2D tin diselenide and its derived 2D heterostructures have delivered promising potentials in various applications ranging from electronics to energy storage devices. The major challenges associated with large-scale fabrication of SnSe2 crystals, however, have hindered its engineering applications. Herein, a tin-extraction synthetic method is proposed for producing large-size SnSe2 bulk crystals. In a typical synthesis, a Sn-containing MAX phase (V2 SnC) and a Se source are heat-treated under a reducing atmosphere, by which Sn is extracted from the V2 SnC phase as a rectified Sn source to form SnSe2 crystals in the cold zone. After the following liquid exfoliation, the obtained 2D SnSe2 nanosheets have a lateral size of a few centimeters and an atomic thickness. Furthermore, by coupling with 2D graphene to form 2D/2D SnSe2 /graphene heterostructured electrodes, as validated by theoretical calculation and experimental studies, the superior Li-/Na-ion storage performance with ultralow surface/interface ion transport barriers are achieved for rechargeable Li-/Na-ion batteries. This innovative synthetic strategy opens a new avenue for the large-scale synthesis of selenides and offers more options into the practical application of emerging 2D/2D heterostructure for electrochemical energy storage.
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Affiliation(s)
- Jun Mei
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Jing Shang
- School of Mechanical, Medical & Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
- School of Materials Science & Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, China
| | - Chao Zhang
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Dongchen Qi
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Liangzhi Kou
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
- School of Mechanical, Medical & Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Binodhya Wijerathne
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Chunfeng Hu
- School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
| | - Ting Liao
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
- School of Mechanical, Medical & Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Jennifer MacLeod
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Ziqi Sun
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4000, Australia
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Xu Z, Li M, Sun W, Tang T, Lu J, Wang X. An Ultrafast, Durable, and High-Loading Polymer Anode for Aqueous Zinc-Ion Batteries and Supercapacitors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2200077. [PMID: 35355338 DOI: 10.1002/adma.202200077] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 03/01/2022] [Indexed: 06/14/2023]
Abstract
Zn metal has shown promise as an anode material for grid-level energy storage, yet is challenged by dendritic growth and low Coulombic efficiency. Herein, an ultrafast, stable, and high-loading polymer anode for aqueous Zn-ion batteries and capacitors (ZIBs and ZICs) is developed by engineering both the electrode and electrolyte. The anode polymer is rationally prepared to have a suitable electronic structure and a large π-conjugated structure, whereas the electrolyte is manufactured based on the superiority of triflate anions over sulfate anions, as analyzed and confirmed via experiments and simulations. This dual engineering results in an optimal polymer anode with a low discharge potential, near-theoretical capacity, ultrahigh-loading capability (≈50 mg cm-2 ), ultrafast rate (100 A g-1 ), and ultralong lifespan (one million cycles). Its mechanism involves reversible Zn2+ /proton co-storage at the carbonyl site. When the polymer anode is coupled with cathodes for both ZIB and ZIC applications, the devices demonstrate ultrahigh power densities and ultralong lifespans, far surpassing those of corresponding Zn-metal-based devices.
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Affiliation(s)
- Zhixiao Xu
- Department of Chemical and Materials Engineering, University of Alberta, 9211-116 Street NW., Edmonton, Alberta, T6G 1H9, Canada
| | - Matthew Li
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 Cass Ave, Lemont, IL, 60439, USA
| | - Wenyuan Sun
- Department of Mechanical Engineering, University of Alberta, 9211-116 Street NW., Edmonton, Alberta, T6G 1H9, Canada
| | - Tian Tang
- Department of Mechanical Engineering, University of Alberta, 9211-116 Street NW., Edmonton, Alberta, T6G 1H9, Canada
| | - Jun Lu
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 Cass Ave, Lemont, IL, 60439, USA
| | - Xiaolei Wang
- Department of Chemical and Materials Engineering, University of Alberta, 9211-116 Street NW., Edmonton, Alberta, T6G 1H9, Canada
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6
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Mei J, Liao T, Peng H, Sun Z. Bioinspired Materials for Energy Storage. SMALL METHODS 2022; 6:e2101076. [PMID: 34954906 DOI: 10.1002/smtd.202101076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/23/2021] [Indexed: 06/14/2023]
Abstract
Nature offers a variety of interesting structures and intriguing functions for researchers to be learnt for advanced materials innovations. Recently, bioinspired materials have received intensive attention in energy storage applications. Inspired by various natural species, many new configurations and components of energy storage devices, such as rechargeable batteries and supercapacitors, have been designed and innovated. The bioinspired designs on energy devices, such as electrodes and electrolytes, have brought about excellent physical, chemical, and mechanical properties compared to the counterparts at their conventional forms. In this review, the design principles for bioinspired materials ranging from structures, synthesis, and functionalization to multi-scale ordering and device integration are first discussed, and then a brief summary is given on the recent progress on bioinspired materials for energy storage systems, particularly the widely studied rechargeable batteries and supercapacitors. Finally, a critical review on the current challenges and brief perspective on the future research focuses are proposed. It is expected that this review can offer some insights into the smart energy storage system design by learning from nature.
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Affiliation(s)
- Jun Mei
- School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4000, Australia
| | - Ting Liao
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4000, Australia
- School of Mechanical Medical and Process Engineering, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4000, Australia
| | - Hong Peng
- School of Chemical Engineering, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Ziqi Sun
- School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4000, Australia
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7
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Mei J, Wang T, Qi D, Liu J, Liao T, Yamauchi Y, Sun Z. Three-Dimensional Fast Na-Ion Transport in Sodium Titanate Nanoarchitectures via Engineering of Oxygen Vacancies and Bismuth Substitution. ACS NANO 2021; 15:13604-13615. [PMID: 34355881 DOI: 10.1021/acsnano.1c04479] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Layered sodium titanates (NTO), one of the most promising anode materials for advanced sodium-ion batteries (SIBs), feature high theoretical capacity and no serious safety concerns. The pristine NTO electrode, however, has unfavorable Na+ transport kinetics, due to the dominant two-dimensional (2D) Na-ion transport channels within the crystal along the low energy barrier octahedron layers, which impedes the practical application of this class of potential materials. Herein, an interesting concept of opening three-dimensional (3D) fast ion transport channels within the intrinsic NTO frameworks is proposed to enhance the electrochemical performance through a combination of oxygen vacancy generation and cation substitution strategies, by which the interlayer spacing of the NTO frameworks is expanded for fast 3D Na-ion transport. It is evidenced that the oxygen-deficient and bismuth-substituted HBNTO (BixNa2-xTi3Oy, 0 < x < 2, 0 < y < 7, HBNTO) exhibits obvious enhancements on the reversible capacity (∼145% enhancement at 20 mAh g-1 compared with NTO), the rate capability (∼200% enhancement at 500 mAh g-1 compared with NTO), and the cycling stability (∼210% enhancement of retention capacity after 150 cycles at 20 mAh g-1 compared with NTO). The molecular dynamic simulations and theoretical calculations demonstrate that the enhanced performance of HBNTO is contributed by the multiplied sodium diffusion pathways and the increased ion migration rates with the successful opening of 3D internal ion transport channels. This work demonstrates the effectiveness of the strategies in opening the 3D intercrystal ion transport channels for boosting the electrochemical performance of SIBs.
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Affiliation(s)
- Jun Mei
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
| | - Tiantian Wang
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dongchen Qi
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
| | - Jianjun Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Ting Liao
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
| | - Yusuke Yamauchi
- Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
- JST-ERATO Yamauchi Materials Space-Tectonics and International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Ziqi Sun
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
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Xiao F, Wang H, Yao T, Zhao X, Yang X, Yu DYW, Rogach AL. MOF-Derived CoS 2/N-Doped Carbon Composite to Induce Short-Chain Sulfur Molecule Generation for Enhanced Sodium-Sulfur Battery Performance. ACS APPLIED MATERIALS & INTERFACES 2021; 13:18010-18020. [PMID: 33822575 DOI: 10.1021/acsami.1c02301] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Dissolution of intermediate sodium polysulfides (Na2Sx; 4≤x≤8) is a crucial obstacle for the development of room-temperature sodium-sulfur (Na-S) batteries. One promising strategy to avoid this issue is to load short-chain sulfur (S2-4), which could prohibit the generation of soluble polysulfides during the sodiation process. Herein, unlike in the previous reported cases where short-chain sulfur was stored by confinement within a small-pore-size (≤0.5 nm) carbon host, we report a new strategy to generate short-chain sulfur in larger pores (>0.5 nm) by the synergistic catalytic effect of CoS2 and appropriate pore size. Based on density functional theory calculations, we predict that CoS2 can serve as a catalyst to weaken the S-S bond in the S8 ring structure, facilitating the formation of short-chain sulfur molecules. By experimentally tuning the pore size of the CoS2-based hosts and comparing their performances as cathodes in Na-S and Li-S batteries, we conclude that such a catalytic effect depends on the proximity of sulfur to CoS2. This avoids the generation of soluble polysulfides and results in superior electrochemical properties of the composite materials introduced here for Na-S batteries. As a result, the optimized CoS2/N-doped carbon/S electrode showed excellent electrochemical performance with high reversible specific capacities of 488 mA h g-1 (962 mA h g(s)-1) after 100 cycles (0.1 A g-1) and 403 mA h g-1 after 1000 cycles (1 A g-1) with a superior rate performance (262 mA h g-1 at 5.0 A g-1).
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Affiliation(s)
- Fengping Xiao
- Department of Materials Science and Engineering, and Center for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong S.A.R., P. R. China
| | - Hongkang Wang
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Tianhao Yao
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Xin Zhao
- Department of Materials Science and Engineering, and Center for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong S.A.R., P. R. China
| | - Xuming Yang
- Department of Materials Science and Engineering, Southern University of Science and Technology, 1088 Xueyuan Road, Shenzhen, Guangdong 518055, P. R. China
| | - Denis Y W Yu
- School of Energy and Environment, and Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong S.A.R., P. R. China
| | - Andrey L Rogach
- Department of Materials Science and Engineering, and Center for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong S.A.R., P. R. China
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Enhancing the understanding of the redox properties of lithium-inserted anthraquinone derivatives by regulating molecular structure. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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