Topic Editors

Dr. Byungchan Bae
Fuel Cell Laboratory, Korea Institute of Energy Research, Daejoen 34129, Republic of Korea
Korea Research Institute Chemical Technology, Yusong, Republic of Korea

Membranes for Electrochemical Energy Conversion

Abstract submission deadline
closed (31 May 2023)
Manuscript submission deadline
closed (31 July 2023)
Viewed by
12333

Topic Information

Dear Colleagues,

Nowadays, the majority of electrochemical energy devices (e.g., fuel cells, lithium batteries, redox flow batteries, electrodialysis, and membrane capacitive deionization) employ polymeric membranes. Since polymeric membranes dramatically affect the performance and durability of the device, their role is becoming critical. Developing a low-cost, high-performance membrane to replace the commercial membrane is essential for developing advanced electrochemical energy devices. As Topic Editor of the Topic "Membranes for Electrochemical Energy Conversion", I would like to cordially invite you to submit a manuscript for consideration and possible publication to this Topic. The aim of this Topic on "Membranes for Electrochemical Energy Conversion" is to share the recent ideas and developments of novel polymer membranes applied for energy storage and generating systems, such as proton and anion exchange membrane fuel cells, water electrolysis, lithium (and other metals) batteries, and other energy storage systems. The major concerns include the synthesis and properties of polymer electrolyte membranes, the fabrication and electrochemical performance of membrane electrode assembly (MEA), and various applications in polymer membranes.

Dr. Byungchan Bae
Dr. Jang-Yong Lee
Topic Editors

Keywords

  • polymer membranes
  • fuel cells
  • water electrolyzer
  • membrane electrode assembly
  • batteries
  • electrochemical systems

Participating Journals

Journal Name Impact Factor CiteScore Launched Year First Decision (median) APC
Catalysts
catalysts
3.9 6.3 2011 14.3 Days CHF 2700
Energies
energies
3.2 5.5 2008 16.1 Days CHF 2600
Membranes
membranes
4.2 4.4 2011 13.6 Days CHF 2700
Nanoenergy Advances
nanoenergyadv
- - 2021 31 Days CHF 1000
Polymers
polymers
5.0 6.6 2009 13.7 Days CHF 2700

Preprints.org is a multidiscipline platform providing preprint service that is dedicated to sharing your research from the start and empowering your research journey.

MDPI Topics is cooperating with Preprints.org and has built a direct connection between MDPI journals and Preprints.org. Authors are encouraged to enjoy the benefits by posting a preprint at Preprints.org prior to publication:

  1. Immediately share your ideas ahead of publication and establish your research priority;
  2. Protect your idea from being stolen with this time-stamped preprint article;
  3. Enhance the exposure and impact of your research;
  4. Receive feedback from your peers in advance;
  5. Have it indexed in Web of Science (Preprint Citation Index), Google Scholar, Crossref, SHARE, PrePubMed, Scilit and Europe PMC.

Published Papers (7 papers)

Order results
Result details
Journals
Select all
Export citation of selected articles as:
14 pages, 2630 KiB  
Article
Fabrication of Tri-Directional Poly(2,5-benzimidazole) Membrane Using Direct Casting for Vanadium Redox Flow Battery
by Jung-Kyu Jang and Tae-Ho Kim
Polymers 2023, 15(17), 3577; https://doi.org/10.3390/polym15173577 - 28 Aug 2023
Viewed by 849
Abstract
In vanadium redox flow batteries (VRFBs), simultaneously achieving high proton conductivity, low vanadium-ion permeability, and outstanding chemical stability using electrolyte membranes is a significant challenge. In this study, we report the fabrication of a tri-directional poly(2,5-benzimidazole) (T-ABPBI) membrane using a direct casting method. [...] Read more.
In vanadium redox flow batteries (VRFBs), simultaneously achieving high proton conductivity, low vanadium-ion permeability, and outstanding chemical stability using electrolyte membranes is a significant challenge. In this study, we report the fabrication of a tri-directional poly(2,5-benzimidazole) (T-ABPBI) membrane using a direct casting method. The direct-cast T-ABPBI (D-T-ABPBI) membrane was fabricated by modifying the microstructure of the membrane while retaining the chemical structure of ABPBI, having outstanding chemical stability. The D-T-ABPBI membrane exhibited lower crystallinity and an expanded free volume compared to the general solvent-cast T-ABPBI (S-T-ABPBI) membrane, resulting in enhanced hydrophilic absorption capabilities. Compared to the S-T-ABPBI membrane, the enhanced hydrophilic absorption capability of the D-T-ABPBI membrane resulted in a decrease in the specific resistance (the area-specific resistance of S-T-ABPBI and D-T-ABPBI membrane is 1.75 and 0.98 Ωcm2, respectively). Additionally, the D-T-ABPBI membrane showed lower vanadium permeability (3.40 × 10−7 cm2 min−1) compared to that of Nafion 115 (5.20 × 10−7 cm2 min−1) due to the Donnan exclusion effect. Owing to the synergistic effects of these properties, the VRFB assembled with D-T-ABPBI membrane had higher or equivalent coulomb efficiencies (>97%) and energy efficiencies (70–91%) than Nafion 115 at various current densities (200–40 mA cm−2). Furthermore, the D-T-ABPBI membrane exhibited stable performance for over 300 cycles at 100 mA cm−2, suggesting its outstanding chemical stability against the highly oxidizing VO2+ ions during practical VRFB operation. These results indicate that the newly fabricated D-T-ABPBI membranes are promising candidates for VRFB application. Full article
(This article belongs to the Topic Membranes for Electrochemical Energy Conversion)
Show Figures

Figure 1

13 pages, 2558 KiB  
Article
Composite Membrane Containing Titania Nanofibers for Battery Separators Used in Lithium-Ion Batteries
by Hun Lee and Deokwoo Lee
Membranes 2023, 13(5), 499; https://doi.org/10.3390/membranes13050499 - 08 May 2023
Viewed by 1475
Abstract
In order to improve the electrochemical performance of lithium-ion batteries, a new kind of composite membrane made using inorganic nanofibers has been developed via electrospinning and the solvent-nonsolvent exchange process. The resultant membranes present free-standing and flexible properties and have a continuous network [...] Read more.
In order to improve the electrochemical performance of lithium-ion batteries, a new kind of composite membrane made using inorganic nanofibers has been developed via electrospinning and the solvent-nonsolvent exchange process. The resultant membranes present free-standing and flexible properties and have a continuous network structure of inorganic nanofibers within polymer coatings. Results show that polymer-coated inorganic nanofiber membranes have better wettability and thermal stability than those of a commercial membrane separator. The presence of inorganic nanofibers in the polymer matrix enhances the electrochemical properties of battery separators. This results in lower interfacial resistance and higher ionic conductivity, leading to the good discharge capacity and cycling performance of battery cells assembled using polymer-coated inorganic nanofiber membranes. This provides a promising solution via which to improve conventional battery separators for the high performance of lithium-ion batteries. Full article
(This article belongs to the Topic Membranes for Electrochemical Energy Conversion)
Show Figures

Figure 1

13 pages, 2607 KiB  
Article
Hydrocarbon-Based Composite Membrane Using LCP-Nonwoven Fabrics for Durable Proton Exchange Membrane Water Electrolysis
by Seok Hyeon Kang, Hwan Yeop Jeong, Sang Jun Yoon, Soonyong So, Jaewon Choi, Tae-Ho Kim and Duk Man Yu
Polymers 2023, 15(9), 2109; https://doi.org/10.3390/polym15092109 - 28 Apr 2023
Cited by 2 | Viewed by 1704
Abstract
A new hydrocarbon-based (HC) composite membrane was developed using liquid crystal polymer (LCP)-nonwoven fabrics for application in proton exchange membrane water electrolysis (PEMWE). A copolymer of sulfonated poly(arylene ether sulfone) with a sulfonation degree of 50 mol% (SPAES50) was utilized as an ionomer [...] Read more.
A new hydrocarbon-based (HC) composite membrane was developed using liquid crystal polymer (LCP)-nonwoven fabrics for application in proton exchange membrane water electrolysis (PEMWE). A copolymer of sulfonated poly(arylene ether sulfone) with a sulfonation degree of 50 mol% (SPAES50) was utilized as an ionomer for the HC membranes and impregnated into the LCP-nonwoven fabrics without any surface treatment of the LCP. The physical interlocking structure between the SPAES50 and LCP-nonwoven fabrics was investigated, validating the outstanding mechanical properties and dimensional stability of the composite membrane in comparison to the pristine membrane. In addition, the through-plane proton conductivity of the composite membrane at 80 °C was only 15% lower than that of the pristine membrane because of the defect-free impregnation state, minimizing the decrease in the proton conductivity caused by the non-proton conductive LCP. During the electrochemical evaluation, the superior cell performance of the composite membrane was evident, with a current density of 5.41 A/cm2 at 1.9 V, compared to 4.65 A/cm2 for the pristine membrane, which can be attributed to the smaller membrane resistance of the composite membrane. From the results of the degradation rates, the prepared composite membrane also showed enhanced cell efficiency and durability during the PEMWE operations. Full article
(This article belongs to the Topic Membranes for Electrochemical Energy Conversion)
Show Figures

Graphical abstract

15 pages, 3027 KiB  
Article
Multi-Block Copolymer Membranes Consisting of Sulfonated Poly(p-phenylene) and Naphthalene Containing Poly(arylene Ether Ketone) for Proton Exchange Membrane Water Electrolysis
by Eui Jin Ko, Eunju Lee, Jang Yong Lee, Duk Man Yu, Sang Jun Yoon, Keun-Hwan Oh, Young Taik Hong and Soonyong So
Polymers 2023, 15(7), 1748; https://doi.org/10.3390/polym15071748 - 31 Mar 2023
Cited by 5 | Viewed by 1882
Abstract
Glassy hydrocarbon-based membranes are being researched as a replacement for perfluorosulfonic acid (PFSA) membranes in proton exchange membrane water electrolysis (PEMWE). Here, naphthalene containing Poly(arylene Ether Ketone) was introduced into the Poly(p-phenylene)-based multi-block copolymers through Ni(0)-catalyzed coupling reaction to enhance π-π [...] Read more.
Glassy hydrocarbon-based membranes are being researched as a replacement for perfluorosulfonic acid (PFSA) membranes in proton exchange membrane water electrolysis (PEMWE). Here, naphthalene containing Poly(arylene Ether Ketone) was introduced into the Poly(p-phenylene)-based multi-block copolymers through Ni(0)-catalyzed coupling reaction to enhance π-π interactions of the naphthalene units. It is discovered that there is an optimum input ratio of the hydrophilic monomer and NBP oligomer for the multi-block copolymers with high ion exchange capacity (IEC) and polymerization yield. With the optimum input ratio, the naphthalene containing copolymer exhibits good hydrogen gas barrier property, chemical stability, and mechanical toughness, even with its high IEC value over 2.4 meq g−1. The membrane shows 3.6 times higher proton selectivity to hydrogen gas than Nafion 212. The PEMWE single cells using the membrane performed better (5.5 A cm−2) than Nafion 212 (4.75 A cm−2) at 1.9 V and 80 °C. These findings suggest that naphthalene containing copolymer membranes are a promising replacement for PFSA membranes in PEMWE. Full article
(This article belongs to the Topic Membranes for Electrochemical Energy Conversion)
Show Figures

Graphical abstract

13 pages, 2423 KiB  
Article
Synthesis of Sulfonated Polyphenylene Block Copolymers via In Situ Generation of Ni(0)
by Vikrant Yadav, Farid Wijaya, Hyejin Lee, Byungchan Bae and Dongwon Shin
Polymers 2023, 15(6), 1577; https://doi.org/10.3390/polym15061577 - 22 Mar 2023
Viewed by 1417
Abstract
Proton exchange membranes (PEMs) fabricated from sulfonated polyphenylenes (sPP) exhibit superior proton conductivity and electrochemical performance. However, the Ni(0) catalyst required for Colon’s cross-coupling reaction for the synthesis of sPP block copolymers is expensive. Therefore, in this study, we generated Ni(0) in situ [...] Read more.
Proton exchange membranes (PEMs) fabricated from sulfonated polyphenylenes (sPP) exhibit superior proton conductivity and electrochemical performance. However, the Ni(0) catalyst required for Colon’s cross-coupling reaction for the synthesis of sPP block copolymers is expensive. Therefore, in this study, we generated Ni(0) in situ from an inexpensive Ni(II) salt in the presence of the reducing metal Zn and NaI. The sPP block copolymers were synthesized from neopentyl-protected 3,5- and 2,5-dichlorobenzenesulfonates and oligo(arylene ether ketone) using the catalyst NiBr2(PPh3)2. The block copolymers synthesized using our strategy and the Ni(0) catalyst exhibited comparable polydispersity index values and high molecular weights. Thin, transparent, and bendable PEMs fabricated using selected high-molecular-weight sPP block copolymers synthesized via our strategy exhibited similar proton conductivities to those of the block copolymers synthesized using the Ni(0) catalyst. We believe that our strategy will promote the synthesis of similar multifunctional block copolymers. Full article
(This article belongs to the Topic Membranes for Electrochemical Energy Conversion)
Show Figures

Graphical abstract

12 pages, 3297 KiB  
Article
An Economical Composite Membrane with High Ion Selectivity for Vanadium Flow Batteries
by Yue Zhang, Denghua Zhang, Chao Luan, Yifan Zhang, Wenjie Yu, Jianguo Liu and Chuanwei Yan
Membranes 2023, 13(3), 272; https://doi.org/10.3390/membranes13030272 - 24 Feb 2023
Cited by 2 | Viewed by 1272
Abstract
The ion exchange membrane of the Nafion series widely used in vanadium flow batteries (VFBs) is characterized by its high cost and high vanadium permeability, which limit the further commercialization of VFBs. Herein, a thin composite membrane enabled by a low-cost microporous polyethylene [...] Read more.
The ion exchange membrane of the Nafion series widely used in vanadium flow batteries (VFBs) is characterized by its high cost and high vanadium permeability, which limit the further commercialization of VFBs. Herein, a thin composite membrane enabled by a low-cost microporous polyethylene (PE) substrate and perfluorosulfonic acid (PFSA) resin is proposed to reduce the cost of the membrane. Meanwhile, the rigid PE substrate limits the swelling of the composite membrane, which effectively reduces the penetration of vanadium ions and improves the ion selectivity of the composite membrane. Benefiting from such a rational design, a VFB assembled with the PE/PFSA composite membrane exhibited a higher coulombic efficiency (CE ≈ 96.8%) compared with commercial Nafion212 at 200 mA cm−2. Significantly, the energy efficiency maintained stability within 200 cycles with a slow decay rate. In practical terms, the thin PE/PFSA composite membrane with low cost and high ion selectivity can make an ideal membrane candidate in VFBs. Full article
(This article belongs to the Topic Membranes for Electrochemical Energy Conversion)
Show Figures

Figure 1

13 pages, 2706 KiB  
Article
Inhibition of Zinc Dendrites Realized by a β-P(VDF-TrFE) Nanofiber Layer in Aqueous Zn-Ion Batteries
by Geumyong Park, Hyeonghun Park, WooJun Seol, Seokho Suh, Ji Young Jo, Santosh Kumar and Hyeong-Jin Kim
Membranes 2022, 12(10), 1014; https://doi.org/10.3390/membranes12101014 - 19 Oct 2022
Cited by 3 | Viewed by 2075
Abstract
Uncontrollable Zn dendrite formations and parasitic side reactions on Zn electrodes induce poor cycling stability and safety issues, preventing the large-scale commercialization of Zn-ion batteries. Herein, to achieve uniform Zn deposition and suppress side reactions, an electrospun ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) copolymer, [...] Read more.
Uncontrollable Zn dendrite formations and parasitic side reactions on Zn electrodes induce poor cycling stability and safety issues, preventing the large-scale commercialization of Zn-ion batteries. Herein, to achieve uniform Zn deposition and suppress side reactions, an electrospun ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) copolymer, a P(VDF-TrFE) nanofiber layer, is introduced as an artificial solid–electrolyte interface on a Cu substrate acting as a current collector. The aligned molecular structure of β-P(VDF-TrFE) can effectively suppress localized current density on the Cu surface, lead to uniform Zn deposition, and suppress side reactions by preventing direct contact between electrodes and aqueous electrolytes. The half-cell configuration formed by the newly fabricated electrode can achieve an average coulombic efficiency of 99.2% over 300 cycles without short-circuiting at a current density of 1 mA cm−2 and areal capacity of 1 mAh cm−2. Stable cycling stability is also maintained for 200 cycles at a current density of 0.5 A g−1 in a full-cell test using MnO2 as a cathode. Full article
(This article belongs to the Topic Membranes for Electrochemical Energy Conversion)
Show Figures

Graphical abstract

Back to TopTop