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Zhou S, Zhao Y, Zhang K, Xun Y, Tao X, Yan W, Zhai W, Ding J. Impact-resistant supercapacitor by hydrogel-infused lattice. Nat Commun 2024; 15:6481. [PMID: 39090118 PMCID: PMC11294459 DOI: 10.1038/s41467-024-50707-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Accepted: 07/15/2024] [Indexed: 08/04/2024] Open
Abstract
The safety of energy storage devices is increasingly crucial due to the growing requirements for application under harsh conditions. Effective methods for enhancing robustness without compromising functionality are necessary. Here we present an impact-resistant, ready-to-use supercapacitor constructed from self-healable hydrogel electrolyte-infused lattice electrodes. Three-dimensional-printed carbon-coated silicon oxycarbide current collectors provide mechanical protection, with compressive stress, Young's modulus, and energy absorption up to 70.61 MPa, 2.75 GPa, and 92.15 kJ/m3, respectively. Commercially viable polyaniline and self-healable polyvinyl alcohol hydrogel are used as active coatings and electrolytes. I-wrapped package structured supercapacitor electrode exhibits a static specific capacitance of 585.51 mF/cm3 at 3 mA/cm3, with an energy density of 97.63 μWh/cm3 at a power density of 0.5 mW/cm3. It maintains operational integrity under extreme conditions, including post-impact with energy of 0.3 J/cm3, dynamic loading ranging from 0 to 18.83 MPa, and self-healing after electrolyte damage, demonstrating its promise for applications in extreme environments.
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Affiliation(s)
- Shixiang Zhou
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Yijing Zhao
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Kaixi Zhang
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Yanran Xun
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Xueyu Tao
- School of Materials and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China
| | - Wentao Yan
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Wei Zhai
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Jun Ding
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore.
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2
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Pan T, Jiang X, van Doremaele ERW, Li J, van der Pol TPA, Yan C, Ye G, Liu J, Hong W, Chiechi RC, van de Burgt Y, Zhang Y. Over 60 h of Stable Water-Operation for N-Type Organic Electrochemical Transistors with Fast Response and Ambipolarity. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2400872. [PMID: 38810112 PMCID: PMC11304290 DOI: 10.1002/advs.202400872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 03/28/2024] [Indexed: 05/31/2024]
Abstract
Organic electrochemical transistors (OECTs) are of great interest in low-power bioelectronics and neuromorphic computing, as they utilize organic mixed ionic-electronic conductors (OMIECs) to transduce ionic signals into electrical signals. However, the poor environmental stability of OMIEC materials significantly restricts the practical application of OECTs. Therefore, the non-fused planar naphthalenediimide (NDI)-dialkoxybithiazole (2Tz) copolymers are fine-tuned through varying ethylene glycol (EG) side chain lengths from tri(ethylene glycol) to hexa(ethylene glycol) (namely P-XO, X = 3-6) to achieve OECTs with high-stability and low threshold voltage. As a result, the NDI-2Tz copolymers exhibit ambipolarity, rapid response (<10 ms), and ultra-high n-type stability. Notably, the P-6O copolymers display a threshold voltage as low as 0.27 V. They can operate in n-type mode in an aqueous solution for over 60 h, maintaining an on-off ratio of over 105. This work sheds light on the design of exceptional n-type/ambipolar materials for OECTs. It demonstrates the potential of incorporating these ambipolar polymers into water-operational integrated circuits for long-term biosensing systems and energy-efficient brain-inspired computing.
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Affiliation(s)
- Tao Pan
- The Institute of Flexible Electronics (IFE, Future Technologies) & IKKEM & State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005P. R. China
| | - Xinnian Jiang
- The Institute of Flexible Electronics (IFE, Future Technologies) & IKKEM & State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005P. R. China
| | - Eveline R. W. van Doremaele
- MicrosystemsDepartment of Mechanical Engineering & Institute for Complex Molecular SystemsEindhoven University of TechnologyEindhoven5600 MBThe Netherlands
| | - Junyu Li
- Sinopec Shanghai Research Institute of Petrochemical TechnologyShanghai201028P. R. China
| | - Tom P. A. van der Pol
- Molecular Materials and Nanosystems & Institute for Complex Molecular SystemsEindhoven University of TechnologyEindhoven5600 MBThe Netherlands
| | - Chenshuai Yan
- The Institute of Flexible Electronics (IFE, Future Technologies) & IKKEM & State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005P. R. China
| | - Gang Ye
- Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei Key Laboratory of Polymer MaterialsSchool of Materials Science and EngineeringHubei UniversityYouyi Road 368Wuhan430062P. R. China
| | - Jian Liu
- State Key Laboratory of Polymer Physics and ChemistryChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin130022P. R. China
| | - Wenjing Hong
- The Institute of Flexible Electronics (IFE, Future Technologies) & IKKEM & State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005P. R. China
| | - Ryan C. Chiechi
- Department of Chemistry & Organic and Carbon Electronics ClusterNorth Carolina State UniversityRaleighNC27695‐8204USA
| | - Yoeri van de Burgt
- MicrosystemsDepartment of Mechanical Engineering & Institute for Complex Molecular SystemsEindhoven University of TechnologyEindhoven5600 MBThe Netherlands
| | - Yanxi Zhang
- The Institute of Flexible Electronics (IFE, Future Technologies) & IKKEM & State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005P. R. China
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3
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Tong Y, Wei Y, Song AJ, Ma Y, Yang J. Polyaniline/Tungsten Trioxide Organic-Inorganic Hybrid Anode for Aqueous Proton Batteries. Chemistry 2024; 30:e202401257. [PMID: 38709195 DOI: 10.1002/chem.202401257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 05/02/2024] [Accepted: 05/06/2024] [Indexed: 05/07/2024]
Abstract
Aqueous proton batteries have received increasing attention due to their outstanding rate performance, stability and high capacity. However, the selection of anode materials in strongly acidic electrolytes poses a challenge in achieving high-performance aqueous proton batteries. This study optimized the proton reaction kinetics of layered metal oxide WO3 by introducing interlayer structural water and coating polyaniline (PANI) on its surface to prepare organic-inorganic hybrid material (WO3 ⋅ 2H2O@PANI). We constructed an aqueous proton battery with WO3 ⋅ 2H2O@PANI anode and MnO2@GF cathode. After 1500 cycles at a current density of 10 A g-1, the capacity retention rate can still reach 80.2 %. These results can inspire the development of new aqueous proton batteries.
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Affiliation(s)
- Yuhao Tong
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Yuan Wei
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - AJing Song
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Yuanyuan Ma
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Jianping Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
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4
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Zhang H, Wang X, Zhou J, Tang W. Azo-Linkage Redox Metal-Organic Framework Incorporating Carbon Nanotubes for High-Performance Aqueous Energy Storage. Molecules 2023; 28:7479. [PMID: 38005202 PMCID: PMC10673354 DOI: 10.3390/molecules28227479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/24/2023] [Accepted: 10/31/2023] [Indexed: 11/26/2023] Open
Abstract
The design of well-defined hierarchical free-standing electrodes for robust high-performance energy storage is challenging. We report herein that azo-linkage redox metal-organic frameworks (MOFs) incorporate single-walled carbon nanotubes (CNTs) as flexible electrodes. The in situ-guided growth, crystallinity and morphology of UiO-66-NO2 MOFs were finely controlled in the presence of CNTs. The MOFs' covalent anchoring to CNTs and solvothermal grafting anthraquinone (AQ) pendants endow the hybrid (denoted as CNT@UiO-66-AQ) with greatly improved conductivity, charge storage pathways and electrochemical dynamics. The flexible CNT@UiO-66-AQ displays a highest areal specific capacitance of 302.3 mF cm-2 (at 1 mA cm-2) in -0.4~0.9 V potential window, together with 100% capacitance retention over 5000 cycles at 5 mA cm-2. Its assembled symmetrical supercapacitor (SSC) achieves a maximum energy density of 0.037 mWh cm-2 and a maximum power density of 10.4 mW cm-2, outperforming many MOFs-hybrids-based SSCs in the literature. Our work may open a new avenue for preparing azo-coupled redox MOFs hybrids with carbaneous substrates for high-performance robust aqueous energy storage.
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Affiliation(s)
- Hualei Zhang
- College of Materials, Xiamen University, Xiamen 361005, China
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xinlei Wang
- College of Materials, Xiamen University, Xiamen 361005, China
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jie Zhou
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Weihua Tang
- College of Materials, Xiamen University, Xiamen 361005, China
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Zhong L, Zhang Y, Li J, Fang L, Liu C, Wang X, Zhang Z, Yu D. Unveiling the Role of Charge Dilution and Anionic Chemistry in Enabling High-Rate p-Type Polymer Cathodes for Dual-Ion Batteries. ACS NANO 2023; 17:18190-18199. [PMID: 37706655 DOI: 10.1021/acsnano.3c05077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/15/2023]
Abstract
Herein, we introduce a p-type redox conjugated covalent organic polymer (p-PNZ) as a universal and high-rate cathode for diverse dual-ion batteries. By constructing an n-type redox counterpart (n-PNZ) with an analogous reticular structure and redox-site composition, we also attain a comparative platform to probe how the redox-site nature and counterion chemistry affect the rate performance of polymer cathodes. It is disclosed that the charge dilution in p-type redox sites and bulky anions engenders their weak interaction and rapid anion diffusion in electrodes, while the trivial interaction of the solvent with anions facilitates anion desolvation and interfacial charge transfer. Thus, p-PNZ possesses rapid surface-controlled redox kinetics with a high anion diffusion coefficient regardless of its inferior porosity and conductivity relative to n-PNZ. Along with a long cycle life of over 50000 cycles, the p-PNZ-engaged Zn-based dual-ion battery with a dilute electrolyte delivers nearly constant capacities of ∼149 mAh g-1 at various rates of ≤10 A g-1─such an unusual rate capability has rarely been observed previously─and retains ∼99 mAh g-1 at 40 A g-1, surpassing the n-PNZ counterpart and most existing p-type organic cathodes. The p-PNZ cathode can also be applied to build high-rate Li-based batteries, signifying its universality, while the "ready-to-charge" character of p-PNZ enables anode-free dual-ion batteries with a high-rate capability and long lifespan.
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Affiliation(s)
- Linfeng Zhong
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High-Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Yang Zhang
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High-Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Jing Li
- Guangdong-Hong Kong-Macau Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macao SAR 999078, People's Republic of China
| | - Long Fang
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High-Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Cong Liu
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High-Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Xiaotong Wang
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High-Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Zishou Zhang
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High-Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Dingshan Yu
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High-Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
- GBRCE for Functional Molecular Engineering, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
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6
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Cavassin P, Holzer I, Tsokkou D, Bardagot O, Réhault J, Banerji N. Electrochemical Doping in Ordered and Disordered Domains of Organic Mixed Ionic-Electronic Conductors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2300308. [PMID: 37086157 DOI: 10.1002/adma.202300308] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 04/17/2023] [Indexed: 05/03/2023]
Abstract
Conjugated polymers are increasingly used as organic mixed ionic-electronic conductors in electrochemical applications for neuromorphic computing, bioelectronics, and energy harvesting. The design of efficient electrochemical devices relies on large modulations of the polymer conductivity, fast doping/dedoping kinetics, and high ionic uptake. In this work, structure-property relations are established and control of these parameters by the co-existence of order and disorder in the phase morphology is demonstrated. Using in situ time-resolved spectroelectrochemistry, resonant Raman, and terahertz (THz) conductivity measurements, the electrochemical doping in the different morphological domains of poly(3-hexylthiophene) (P3HT) is investigated. The main finding is that bipolarons are found preferentially in disordered polymer regions, where they are formed faster and are thermodynamically more favored. On the other hand, polarons show a preference for ordered domains, leading to drastically different bipolaron/polaron ratios and doping/dedoping dynamics in the distinct regions. A significant enhancement of the electronic conductivity is evident when bipolarons start forming in the disordered regions, while the presence of bipolarons in the ordered regions is detrimental for transport. This study provides significant advances in the understanding of the impact of morphology on the electrochemical doping of conjugated polymers and the induced increase in conductivity.
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Affiliation(s)
- Priscila Cavassin
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Isabelle Holzer
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Demetra Tsokkou
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Olivier Bardagot
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Julien Réhault
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Natalie Banerji
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
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7
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Sun H, Yang L, Hu E, Feng M, Fan C, Wang W, Li H, Wang X, Liu Z. Rose-like VS 2 Nanosheets Chemically Anchored on Carbon Nanotubes for Flexible Zinc-Ion Batteries with Enhanced Properties. ACS APPLIED MATERIALS & INTERFACES 2022; 14:40247-40256. [PMID: 35998888 DOI: 10.1021/acsami.2c11317] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Rechargeable aqueous zinc-ion batteries (ZIBs) are an attractive alternative for flexible energy storage devices due to their excellent safety and low cost. One of the main challenges that plagues their practical applications is the restricted variety of cathode materials with fast reaction kinetics and good mechanical properties. Herein, we prepared rose-like VS2 nanosheets which have decent specific capacities, metallic conductivity, and open-enough channels and further incorporated them into a single-walled carbon nanotube (SWCNT) network, achieving a C-V chemical-bonded freestanding VS2@SWCNT (C-VS2) composite. Such chemical bonding in the composites builds a bridge for rapid electron transfer and ion diffusion in the longitudinal direction from one layer to another layer. As a result, the reversible Zn/C-VS2 system in core cells exhibits a high specific capacity (205.3 mA h g-1 at 0.1 A g-1), an excellent cyclic stability (115.4 mA h g-1 was obtained after 1500 cycles at 5 A g-1), and a remarkable rate capability (135.4 mA h g-1 at 10 A g-1). Furthermore, the freestanding C-VS2 films with good flexibility and conductivity can serve as a flexible cathode to assemble soft-packaged ZIBs. Meanwhile, the soft-packaged ZIB has good electrochemical stability even under different bending conditions (the discharge capacity dropped by only 2.1 mA h g-1 after bending). This work offers insights into the rational design of zinc-ion hosts throughout chemical bond engineering.
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Affiliation(s)
- Hongran Sun
- College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao 266061, China
| | - Lei Yang
- Research Center for Intelligent and Wearable Technology, College of Textiles and Clothing, Qingdao University, Qingdao 266071, China
| | - Enze Hu
- College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao 266061, China
| | - Min Feng
- College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao 266061, China
| | - Cheng Fan
- College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao 266061, China
- Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Wanli Wang
- College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao 266061, China
| | - Huifang Li
- College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao 266061, China
| | - Xiaojun Wang
- College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao 266061, China
- Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Zhiming Liu
- College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao 266061, China
- Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
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Chen Y, Wu HY, Yang CY, Kolhe NB, Jenekhe SA, Liu X, Braun S, Fabiano S, Fahlman M. In Situ Spectroscopic and Electrical Investigations of Ladder-type Conjugated Polymers Doped with Alkali Metals. Macromolecules 2022; 55:7294-7302. [PMID: 36034325 PMCID: PMC9407040 DOI: 10.1021/acs.macromol.2c01190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/31/2022] [Indexed: 11/30/2022]
Abstract
![]()
Ladder-type conjugated polymers exhibit a remarkable
performance
in (opto)electronic devices. Their double-stranded planar structure
promotes an extended π-conjugation compared to inter-ring-twisted
analogues, providing an excellent basis for exploring the effects
of charge localization on polaron formation. Here, we investigated
alkali-metal n-doping of the ladder-type conjugated polymer (polybenzimidazobenzophenanthroline)
(BBL) through detailed in situ spectroscopic and electrical characterizations.
Photoelectron spectroscopy and ultraviolet–visible–near-infrared
(UV–vis–NIR) spectroscopy indicate polaron formation
upon potassium (K) doping, which agrees well with theoretical predictions.
The semiladder BBB displays a similar evolution in the valence band
with the appearance of two new features below the Fermi level upon
K-doping. Compared to BBL, distinct differences appear in the UV–vis–NIR
spectra due to more localized polaronic states in BBB. The high conductivity
(2 S cm–1) and low activation energy (44 meV) measured
for K-doped BBL suggest disorder-free polaron transport. An even higher
conductivity (37 S cm–1) is obtained by changing
the dopant from K to lithium (Li). We attribute the enhanced conductivity
to a decreased perturbation of the polymer nanostructure induced by
the smaller Li ions. These results highlight the importance of polymer
chain planarity and dopant size for the polaronic state in conjugated
polymers.
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Affiliation(s)
- Yongzhen Chen
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping 60174, Sweden
| | - Han-Yan Wu
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping 60174, Sweden
| | - Chi-Yuan Yang
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping 60174, Sweden
| | - Nagesh B. Kolhe
- Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, Washington 98195-1750, United States
| | - Samson A. Jenekhe
- Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, Washington 98195-1750, United States
| | - Xianjie Liu
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping 60174, Sweden
| | - Slawomir Braun
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping 60174, Sweden
| | - Simone Fabiano
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping 60174, Sweden
| | - Mats Fahlman
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping 60174, Sweden
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