JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xueye Zhuang,Shiman He,Long Hu,Qian Shi,Hui Wang,Renzong Hu
LiBH 4 has been considered as a promising solid electrolyte for lithium-ion batteries. However, the low ionic conductivity at room temperature has been the biggest challenge of LiBH 4 solid-state electrolyte (SSE) toward practical solid-state batteries. In this work, a ternary electrolyte is designed and prepared by milling LiBH 4 with LiNH 2 and interfacially decorated with g-C 3 N 4 . It is revealed that the soft dispersed phase of two-dimensional g-C 3 N 4 can build an effective transportation network in the composite electrolyte, thereby decreasing the interfacial impedance and reducing the energy barrier for lithium ion diffusion. The optimized SSE, LiBH 4 -2LiNH 2 -g-C 3 N 4 -10 % (LBN-CN-10 %), exhibits an ionic conductivity of 1.5×10 −3 S cm −1 , five orders of magnitude higher than that of the LiBH 4 electrolyte at 30 °C. The LiIn symmetric cell with LBN-CN-10 % electrolyte delivers a low polarization of ∼89 mV over 10,000 h. When assembling with Li 4 Ti 5 O 12 cathode, the all-solid-state battery exhibits excellent cycling over 1000 cycles at 30 ℃, achieving a breakthrough in the lifetime of solid-state batteries with LiBH 4 -based electrolyte. Moreover, the all-solid-state battery with LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode also delivers a discharge plateau at 3.0 V, revealing the high voltage withstanding of LBN-CN-10 % electrolyte. This work provides new options for the development and practical application of room-temperature hydride all-solid-state batteries.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Fang Hua Liu,Qian Yang,Xue Lang Gao,Hong Yue Wu,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
To prepare anion exchange membranes (AEMs) with high performances, we tethered the as-synthesized oligomers with dense N-spirocyclic cations (NS) as the side-chain to poly(ether sulfone) (PES). The steric hindrance of spirocyclic structure and electron-donating effect of alkyl spacers significantly enhance the stability of cations in harsh alkaline and high hydration conditions. Correspondingly, the ionic exchange capacity (IEC) of PES–NS–10% only decreased by 13.8% and the conductivity remained 84.3% after being immersed in harsh environment (80 °C, 2 M NaOH) for 864 h. In addition, the high density of N-spirocyclic cations in the side-chain benefits the formation of clear microphase separation , as confirmed by atomic force microscopy (AFM) and transmission electron microscopy (TEM). The highest conductivity of 95.5 mS cm -1 was achieved by PES–NS–10% at 80 °C while the corresponding swelling ratio was only 7.69%. Furthermore, the single cell assembled with PES–NS–10% showed a peak power density of 110.1 mW cm -2 at 300 mA cm -2 . Durability test of the single cell based on PES–NS–10% under 100 mA cm -2 also demonstrates that the as-prepared AEMs with NS have potential application for fuel cells.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Guan Lijiang,Guo Zhaoqi,Zhou Qi,Zhang Jin,Cheng Cheng,Wang Shengyao,Zhu Xiang,Dai Sheng,Jin Shangbin
Proton-conducting materials are essential to the emerging hydrogen economy. Covalent triazine frameworks (CTFs) are promising proton-conducting materials at high temperatures but need more effective sites to strengthen interaction for proton carriers. However, their construction and design in a concise condition are still challenges. Herein, we show a low temperature approach to synthesize CTFs via a direct cyclotrimerization of aromatic aldehyde using ammonium iodide as facile nitrogen source. Among the CTFs, the perfluorinated CTF (CTF-TF) was successfully synthesized with much lower temperature ( ≤ 160 °C) and open-air atmosphere. Due to the additional hydrogen-bonding interaction between fluorine atoms and proton carriers (H 3 PO 4 ), the CTF-TF achieves a proton conductivity of 1.82 × 10 −1 S cm −1 at 150 °C after H 3 PO 4 loading. Moreover, the CTF-TF can be readily integrated into mixed matrix membranes, displaying high proton conduction abilities and good mechanical strength. This work provides an alternative strategy for rational design of proton conducting media.
研究领域:
材料科学
·
化学工程
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
Inhee Maeng,Shi Chen,Seungjun Lee,Shenghao Wang,Young-Kyun Kwon,Min-Cherl Jung
The realization of terahertz (THz) detectors using organic-inorganic hybrid perovskite (OHP) materials presents a challenge because of the high real conductivities and broad THz absorption spectra required. The control of phonon vibration modes in OHPs depends on the control of defect states such as the defect-incorporated perovskite structure and the δ/α -mixed interfacial structure observed in MAPbI 3 and δ/α -mixed FAPbI 3 , respectively. Difficulties with defect control in particular materials may amplify relative risk factors and invite strong resistance to commercialization. As an alternative to OHPs, the all-inorganic perovskite material CsPbI 3 (lacking the hydrophobic organic cations that generate structural defects) constitutes a good candidate for THz detectors. We investigated the phonon vibration modes of thin films of the all-inorganic perovskite γ -CsPbI 3 containing no atomic or chemical defect states. We observed the three expected major phonon vibration modes at 0.9, 1.5, and 1.8 THz that originate from the transverse I–Pb–I frame, the Cs–I–Cs optical vibration, and the longitudinal I–Pb–I frame, respectively, finding good agreement with theoretical simulations. Significantly, the real conductivity of these all-inorganic perovskite thin films ranged from approximately 10–40 S/cm across a broad frequency range of 0.5–3.0 THz, demonstrating the material's considerable potential for application as a THz-band detector.
研究领域:
材料科学
·
光子学
·
半导体物理
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产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2022
·
IF 3.555
Benlin Yao,Yiqun Xiao,Yanhong Jia,Sida Wu,Mingshuai Yang,Hui He
The role of oxygen in the electrolytic reduction of uranium oxide in molten salt has received increased attention in recent years. In contrast to solubility, few studies were reported on the kinetic property of oxygen in LiCl. In this work, diffusion behaviors of oxygen anion in the bulk salt and oxide cathode were both studied. A gold working electrode was used to conduct corresponding voltammetry studies in LiCl-rich melt at 923 K. The obtained diffusion coefficient increased when another salt (KCl or LiF) was introduced to LiCl. A model based on ohmic, concentration and electrochemical polarizations was derived and used to describe the electro-deoxidation of uranium oxide in molten salt. By analyzing experimental current-time curves obtained from potentiostatic electrolysis, parameters such as exchange current density, conductivity of porous uranium filled with electrolyte and diffusion coefficient of oxygen anion in porous uranium were calculated. Taken together, the behavior of oxygen in the electro-deoxidation of uranium oxide in LiCl-rich melt can be better understood.
研究领域:
材料科学
·
电化学
·
核工程
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产品关联
DOI
高影响因子
Green Energy & Environment
·
2022
·
IF 12.781
Guoshen Yang,Gangrui Qu,Chi Fang,Jie Deng,Xianqi Xu,Yinghao Xie,Tian Sun,Yachao Zhu,Jiaxin Zheng,Hang Zhou
The recent advances in aqueous magnesium-ion hybrid supercapacitor (MHSC) have attracted great attention as it brings together the benefits of high energy density, high power density, and synchronously addresses cost and safety issues. However, the freeze of aqueous electrolytes discourages aqueous MHSC from operating at low-temperature conditions. Here, a low-concentration aqueous solution of 4 mol L −1 Mg(ClO 4 ) 2 is devised for its low freezing point (−67 °C) and ultra-high ionic conductivity (3.37 mS cm −1 at −50 °C). Both physical characterizations and computational simulations revealed that the Mg(ClO 4 ) 2 can effectively disrupt the original hydrogen bond network among water molecules via transmuting the electrolyte structure, thus yielding a low freezing point. Thus, the Mg(ClO 4 ) 2 electrolytes endue aqueous MHSC with a wider temperature operation range (−50 °C–25 °C) and a higher energy density of 103.9 Wh kg −1 at 3.68 kW kg −1 over commonly used magnesium salts (i.e., MgSO 4 and Mg(NO 3 ) 2 ) electrolytes. Furthermore, a quasi-solid-state MHSC based on polyacrylamide-based hydrogel electrolyte holds superior low-temperature performance, excellent flexibility, and high safety. This work pioneers a convenient, cheap, and eco-friendly tactic to procure low-temperature aqueous magnesium-ion energy storage device.
研究领域:
电化学
·
能源存储
·
材料科学
·
超级电容器
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Huijuan Bai,Hanqing Peng,Yan Xiang,Jin Zhang,Haining Wang,Shanfu Lu,Lin Zhuang
The properties of high temperature polymer electrolyte membranes (HT-PEMs) are determined directly by the polymer matrix with phosphoric acid (PA) doping. Here, new polymer materials based on poly (arylene piperidine)s (PAPs) are prepared by one-step polymerization as PA absorbing matrix for HT-PEM fuel cells (HT-PEMFCs) application. The PAPs show excellent thermal stability and high glass transition temperature . Among PAPs, PA doped poly (N-methyl-piperidine- co - p -terphenyl) (PPT/PA) shows a high proton conductivity of 96.0 mS cm −1 at 180 °C without humidification and an excellent tensile strength of 12 MPa, which is much better than that of PA doped commercial poly [2,2’-( p -oxydiphenylene)-5,5′-benzimidazole] (OPBI/PA). The enhancement on conductivity of PPT/PA is attributed to the formation of micro-phase separation. A single cell based on PPT/PA membrane presents outstanding performance with a maximum power density of 1220.2 mW cm −2 with H 2 /O 2 feeding under 0.15 MPa backpressure in cathode at 180 °C, which is 1.85 times of that with OPBI/PA membrane (660.8 mW cm −2 ). Furthermore, a H 2 /air single cell with PPT/PA shows excellent stability at a constant current density of 120 mAcm −2 and 150 °C for 1600 h. This work indicates PAPs (especially, PPT) are a promising PA doping polymer matrix for high temperature polymer electrolyte membrane fuel cells application .
研究领域:
材料科学
·
化学工程
·
电化学
·
能源材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 20
·14456-14464
·
IF 3.9
Jamal Afzal,Jiashun Zhang,Haijiang Wang
Proton exchange membranes (PEMs) have emerged as very promising membranes for automotive applications because of their notable proton conductivity at low temperatures. These membranes find extensive utilization in fuel cells. Several polymeric materials have been used, but their application is constrained by their expense and intricate synthetic processes. Affordable and efficient synthetic methods for polymeric materials are necessary for the widespread commercial use of PEM technology. The polymeric combination of hexachlorocyclotriphosphazene (HCCP) and 4,4-diamino-2,2-biphenyldisulfonic acid facilitated the synthesis of PP-(PhSO3H)2, a polyphosphazene with built-in –SO3H moieties. Characterization revealed that it was a porous organic polymer with high stability. PP-(PhSO3H)2 exhibited a proton conductivity of up to 8.24 × 10−2 S cm−1 (SD = ±0.031) at 353 K under 98% relative humidity (RH), which was more than two orders of magnitude higher than that of its –SO3H-free analogue, PP-(Ph)2 (2.32 × 10−4 S cm−1) (SD = ±0.019) under identical conditions. Therefore, for application in a PEM fuel cell, PP-(PhSO3H)2-based matrix-mixed membranes (PP-(PhSO3H)2-MMMs) were fabricated by mixing them with polyacrylonitrile (PAN) in various ratios. The proton conductivity could reach up to 6.11 × 10−2 S cm−1 (SD = ±0.0048) at 353 K and 98%RH, when the weight ratio of PP-(PhSO3H)2 : PAN was 3 : 1, the value of which was comparable with those of commercially available electrolytes used in PEM fuel cells. PP-(PhSO3H)2-MMM (3 : 1) had an extended lifetime of reusability. Using phosphazene and bisulfonated multiple-amine modules as precursors, we demonstrated that a porous organic polymer with a highly effective proton-conductive matrix-mixed membrane for PEM fuel cells could be produced readily by an intuitive polymeric reaction.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Peng Zhang,Xiaotong Yang,Tong Wang,Nobuyuki Imanishi,Osamu Yamamoto,Miao Wang
We demonstrate a novel rechargeable energy storage system having a metallic lithium negative electrode and a liquid–solid hybrid positive electrode of Fe 3+ /Fe 2+ /Fe in N,N-Dimethylformamide, which are separated by an impermeable NASICON–type Li 1.4 Al 0.4 Ge 0.2 Ti 1.4 (PO 4 ) 3 –epoxy resin composite film with a lithium ion conductivity of ca. 5.0 × 10 −4 S cm −1 . The discharge curve for the battery shows two plateaus. The first plateau corresponds to Li + FeCl 3 = LiCl + FeCl 2 , while the second one is associated with 2 Li + FeCl 2 = 2 LiCl + Fe. In the process of reduction of Fe 3+ to Fe 2+ , it delivers a stable discharge capacity of ca. 110 mAh g FeCl3 −1 with a Coulombic efficiency higher than 95% and is capable of enduring over 60 circles at a high current density of 1.0 mA cm −2 without any catalyst. Furthermore, a stable discharge capacity up to ca. 455 mAh g FeCl3 −1 is achieved for conversion of FeCl 3 /FeCl 2 /Fe with a three–electron reaction. This work demonstrates a proof of feasibility of hybrid liquid–solid hybrid positive electrode, since these reactions are reversible confirmed by x–ray diffraction patterns and EDX mapping test.
研究领域:
材料科学
·
电化学
·
能源存储系统
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2022
·Vol. 66
·期 1
·267-280
·
IF 3.903
Xiao Meng,Yao Yuan,Liu WenGuang
Stretchable ionic thermoelectric (i-TE) materials have attracted growing interest in converting low-grade thermal energy into electricity. However, substantial improvement on i-TE performance of quasi-solid ionogels remains a significant challenge. Here, a nanocomposite ionogel with skin-like stretchability, high i-TE performance, thermostability and durability is prepared by hybridizing ionic liquid (IL) and Laponite nanosheets into waterborne polyurethane (WPU). With multiple H-bond, WPU can accommodate a higher content of IL, thereby improving its ionic conductivity. After cation exchange between IL and Laponite, the negatively charged Laponite sheets and released Na + can enhance the ionic Seebeck coefficient by enlarging thermophoretic mobility difference between the cations and anions in ionogel. Besides, incorporation of Laponite causes the decrease of thermal conductivity. Thus, the WPU-IL-Laponite ionogel exhibits a high ionic thermopower of 44.1 mV K −1 , high ionic conductivity of 14.1 mS cm −1 and low thermal conductivity of 0.43 W m −1 K −1 at a relative humidity of 90%. The corresponding ionic figure of merit of the ionogel is 1.90±0.27. Moreover, the ionogel demonstrates excellent durability during repeated stretching process. The stretchable ionogel can be fabricated into ionic thermoelectric capacitor to convert thermal energy from solar radiation into electricity.
研究领域:
材料科学
·
热电学
·
纳米技术
·
能量收集
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Guibin Li,Chunyu Ru,Fengmei Cheng,Duo Qi,Shiyuan Zhou,Yi Li
In the present work, a novel poly(arylene ether ketone) with a unique molecular design that included concentrated flexible sulfoalkyl groups and a silane cross-linked network (C-SPAEK) was prepared and used as a PEM for DMFCs . The chemical structures , sulfonation degree and phase-separated morphology were characterized and identified by 1 H NMR, FT-IR and SAXS. The resulting copolymers exhibited excellent thermal stability (T 5% >263.8 °C) and mechanical properties (tensile strength>52.88 MPa). Additionally, the high IEC values and obvious hydrophilic/hydrophobic phase-separated structure (d > 2.71 nm) ensured that the C-SPAEK membranes possessed high proton conductivities . The C-SPAEK PEMs also displayed enhanced methanol resistance and dimensional stability, which were much better than those of a recast Nafion membrane under the same conditions. The C-SPAEK-0.4 membrane maintained a low methanol absorption of less than 48.7%, even in 4 M methanol solution. In particular, the C-SPAEK-0.6 membrane exhibited the best comprehensive performance, with a high proton conductivity (0.164 S cm −1 ), low methanol uptake (52.1%) and permeability (3.63 × 10 −7 cm 2 s −1 ), and maximum power density (83.2 mW cm −2 ), when immersed in 2 M methanol at 80 °C in a DMFC single-cell. These results suggested that the C-SPAEK membranes were sufficiently tough and had the potential to overcome the problems caused by the high methanol permeability of PEMs. The unique molecular design of C-SPAEK guaranteed a rare combination of high proton conductivity and enhanced methanol resistance, which are the key determining factors for DMFC applications .
研究领域:
材料科学
·
电化学
·
高分子化学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）