JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Hongying Tang,Kang Geng,Jinkai Hao,Xiaojuan Zhang,Zhigang Shao,Nanwen Li
Quaternized poly(sulfone)s based on trimethylamine (PSf-TMA-x) and triethylamine (PSf-TEA-x) are developed to form quaternary ammonium (QA)-biphosphate ion pairs as promising high temperature proton exchange membrane (HT-PEM) in H 2 /O 2 fuel cells. The strong QA-biphosphate ion-pair interaction results in high acid absorption and thus high proton conductivity of 78.1 mS cm −1 for PSf-TEA-110/PA membrane at 160 °C in spite of its lower degree of functionalization. Thus, the peak power density of more than 400 mW cm −2 is achieved at 160 °C for the quaternized PSf membranes in H 2 /O 2 fuel cell, which is higher than that of the poly(benzeimidazole) ( m -PBI) membrane (370 mW cm −2 ). Subsequently, the degradation mechanism of the PSf membranes is demonstrated using NMR technique to be occurred in both the polymer backbone and the QA groups. The stability investigation of model compounds further confirms that the degradation of the membranes resulted from the scission of ether linkage and isopropylidene group and the SN2 nucleophilic substitution of QA at operating conditions. Therefore, the significant performance decrease is observed and the lifetime is only less than 30 h at 200 mA cm −2 which is much lower than that of m -PBI membrane (>40 h).
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DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Jiayong Zhang,Ting Wang,Bin Yao,Zhanhui Ding,Yongfeng Li,Chunkai Wang,Jia Liu
High carrier recombination at the Cu2ZnSn (S, Se)4(CZTSSe)/CdS interface is the critical issue that results in the low power conversion efficiency (PCE) of CZTSSe solar cells. To reduce the recombination by optimizing the CZTSSe/CdS interfacial structure, we fabricated a Zn doped CdS (ZnxCd1 – xS) thin film with x of 0–0.32 and a CZTSSe solar cell with the ZnxCd1 – xS as the buffer layer. It is found that Zn substitutes for Cd in the x range of 0–0.26 and that some of the Zn substitutes for Cd and another Zn locates in the interstitial site of the CdS lattice in the x range of 0.26–0.32, which make the lattice mismatch between CZTSSe and ZnxCd1 – xS decrease in x of 0–0.26 and increase in x of 0.26–0.32. The conduction band offset at the CZTSSe/ZnxCd1 – xS interface is demonstrated by XPS to be a positive ″spike″-like type and increases from 0.11 to 0.43 eV as x increases from 0 to 0.32. PCE is increased from 5.00 to 7.73% by optimizing x. The increased PCE is attributed to increased open-circuit voltage (VOC) and filling factor (FF), while the decreased PCE is due to decreased VOC, FF, and JSC. By using quantitative analysis methods, the increased VOC and FF are mainly attributed to the increased shunt resistance (Rsh) and decreased reverse saturation current density (J0), and the decreased short-circuit current density (JSC) is attributed to the increased conduction band offset (CBO). The influence mechanism of Zn doping on Rsh, J0, and CBO is discussed.
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高影响因子
Nanoscale
·
2021
·Vol. 14
·期 3
·700-714
·
IF 7.79
Zhiyu Zhou,Zexiang Chen,Yang Zhao,Huifang Lv,Hualiang Wei,Bingbing Chen,Zengjie Gu,Yan Wang
In recent years and following the progress made in lithium-ion battery technology, substantial efforts have been devoted to developing practical lithium–sulfur (Li–S) batteries for next-generation commercial energy storage devices. The practical application of Li–S batteries is still limited by dramatically reduced capacities, cycling instabilities, and safety issues arising from flammable components. In this study, we designed and fabricated a flame-retardant, multifunctional interlayer which integrated electroconductive networks, lithium polysulfide (LiPS) traps and catalysts to significantly elevate the electrochemical performance and safety of pristine Li–S batteries. The LiPS adsorptive polymer polyimide (PI) constrains polysulfides to the cathode region and effectively suppresses the shuttle effect. Coralloid PI/multiwalled carbon nanotube (MCNT) compounds provide plentiful reaction sites for active materials. The catalytic Ni on the metal skeleton surface notably promotes Li+ diffusion, lowers the redox overpotential and accelerates LiPS conversion, which improves the redox kinetics associated with sulfur-related species and significantly elevates sulfur utilization. At different current densities of 0.2 C and 0.5 C, impressive initial discharge capacities of 1275.3 mA h g−1 and 1190.9 mA h g−1 are attainable respectively, with high capacity retentions of 80.3% and 78.6% over 600 cycles. Besides, the multifunctional interlayer can also act as a flame-retardant layer to promote the safety of Li–S batteries by inhibiting the spread of fire. This study provides a feasible and prospective strategy that adopts a multifunctional interlayer to develop Li–S batteries with higher capacities, longer cycling lives and safer working conditions.
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DOI
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
Z.H. Xie,Z.X. Huang,M.Z. Rong,M.Q. Zhang
To retard the performance degradation of sulfur cathode in lithium–sulfur (Li–S) batteries originating from severe volume variation and intermediate polysulfides shuttle effect during charge and discharge process, commercial polyacrylic acid (PAA) crosslinked by cationic hydroxypropyl polyrotaxane (HPRN + ) is used as a water-based multifunctional binder (PAA-HPRN + ) of the cathode for the first time. The assembled Li–S battery with the simple sulfur/carbon composite cathode adhered by PAA-HPRN + displays an outstanding cycling specific capacity retention of 59.9% after 900 cycles at 1.0 C, and the corresponding capacity fading rate per cycle is 0.0446%, which are better than many reported values. Moreover, the cathode also exhibits excellent specific capacity and cycling stability even under high sulfur loading. The superior electrochemical properties are attributed to the slipping of the polyrotaxane that provides the binder with improved mechanical robustness and trapping capability of the soluble polysulfides that suppresses shuttle effect. The proposed design of the multifunctional binder may help to realize practical application of the Li–S battery.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Jiayong Zhang,Xiangqian Shen,Jun Xing,Shuguo Yu,Mengge Li,Ding Ma,Yuting Sun,Rong Wu,Bin Yao
Air-processed kesterite solar cells show excellent prospects for commercial application because they are suitable for large-scale production. This study shows how the power conversion efficiency (PCE) of (Cu, Ag) 2 ZnSn(S, Se) 4 solar cells can be improved by adjusting the annealing time during the selenization process at a low temperature of 70 °C. Enhancement of PCE is achieved when the annealing time is 240 s. The primary determinant of enhanced PCE is a reduction in reverse saturation current density (J 0 ) and ideality factor (A). Examination of depth characterization indicated that the decrease in J 0 and A can be ascribed to the inhibition of [2Cu Zn + Sn Zn ] defects cluster, which is mainly accountable for the band tail states, and the suppression of interface recombination .
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 9
·3930-3946
·
IF 3.5
Miao Xin,Wang Liying,Shi Yunxin,Chen Guohua,Liu Yunfei,Wu Gaoqi,Cao Zhenzhu,Zhang Yongfeng
Microsphere 3D structure of Cu/Mn 3 O 4 @SC composite was fabricated by pyrolyzing the bimetallic CuMn-MOF, which was composed of Cu 2+ , Mn 2+ and sulfur-containing ligand 2,5-thiophene dicarboxylic acid (H 2 TDC). The composite of Cu/Mn 3 O 4 @SC is used as a high-performance anode material for the lithium-ion batteries cycle exhibiting stable capacities of 715 mAh g −1 after 100 cycles at 200 mA g −1 and outstanding long cycle performance with a reversible capacity of 508 mAh g −1 at 0.5 A g −1 after 500 cycles. The superior performance for the Cu/Mn 3 O 4 @SC anode is mainly attributed to the mutual supporting characteristics of heterojunction synergistic effect, thus avoiding damage in the process of energy storage process. In addition, the kinetic analysis based on CV reveals that the transport kinetics mechanism of the Cu/Mn 3 O 4 @SC is synergistically controlled by the surface capacitive and pseudocapacitive behaviors. The EIS proves that the introduction of Cu enhances the conductivity of the material and the rate of lithium-ion diffusion. Graphical abstract Cu- and S-doped multielement microspheres was fabricated by pyrolyzing CuMn-MOF supported by 2, 5-thiophene dicarboxylic acid.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Haozhe Li,Yufeng Sun,Zongtang Liu,Xinlong Sha,Zhenghao Fei,Lei Yu,Xiankun Wu,Xiaoju Wen,Rui Luo,Qihui Xu,Huiling Yan,Xiangdong Zhu,Binbin Qian
Nanoscale zerovalent iron (nZVI) has attracted extensive attention in the oxidative decomposition of organic matters as the persulfate (PS) activator due to its tunable physical/chemical properties and unique electronic structures. However, the trend of agglomeration and ease of oxidation for nZVI seriously hinder its further application. Herein, a composite catalyst composed of polyethyleneimine modified rice husk biochar (RHB-PEI) loaded with sulfide modified nZVI (S-nZVI) was constructed and its micro-structure was characterized by STEM, SEM, XRD, FT-IR and XPS. Results show that a layer of FeS shell with a thickness of ∼ 3 nm was formed around nZVI, and the whole core-shell structure was uniformly loaded on the N-doped RHB. The as-synthesized catalyst was used as a PS activator to remove sulfamethazine (SMT), a typical sulfonamide antibiotic. Compared with nZVI, the removal rate ( k obs ) of S-nZVI@RHB-PEI increased from 0.091 min⁻ 1 to 0.287 min⁻ 1 within 60 min, and the removal efficiency enhanced by 10.45 times in the fifth cycle experiment. The improvement of degradation performance in S-nZVI@RHB-PEI/PS system is not a simple accumulation caused by different heteroatom doping, but the synergistic effect from different heteroatom doping. The activation of PS by S-nZVI@RHB-PEI can effectively generate reactive oxygen species (ROS), including 1 O 2 , O 2 • ⁻, SO 4 • ⁻ and •OH, in which 1 O 2 played a major role. To be specific, under the attack of ROS, SMT was oxidized through a series of ring opening, SO 2 extrusion, Smiles rearrangement, and bond cleavage. This study verified the synergistic effect of N, S and Fe co-doped RHB on SMT degradation, the resultant catalyst demonstrated a higher electron transfer efficiency and thus exhibited excellent degradation efficiency and sustainable utilization over a wider pH range, which will advance the rational design of biochar supported nZVI catalysts and offer insights into the PS activation mechanism for the efficient degradation of SMT.
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产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Lijuan Liu,Yingqiu Zheng,Wenshu Chen,Yongping Du,Linfeng Hu,Guoqiang Luo,Qiang Shen,Jian Zhang
Alkaline water electrolysis holds potential for large-scale, high-purity hydrogen production. However, the slow kinetics of water dissociation and challenging conditions in alkaline environments complicate the search for an electrocatalyst with both high activity and durability. In this study, a highly active and stable amorphous electrocatalyst is introduced, 3Ni─Co─S─O, developed via a straightforward electrodeposition method for alkaline hydrogen evolution reaction (HER). Notably, the surface of the 3Ni─Co─S─O catalyst undergoes a compositional reconstruction during alkaline HER, yet maintains its amorphous structure. This reconstruction spans roughly 6 µm, leading to a gradual decrease in Ni and S content and a corresponding increase in O concentration toward the surface, thereby forming a stable, gradient active layer. Benefitting from this layer and its amorphous nature, the 3Ni─Co─S─O catalyst demonstrates superior alkaline HER activity—requiring only 170 mV to achieve an industrial HER current density of 1000 mA cm −2 . It also showcases remarkable stability, with a mere 15 mV increase in overpotential during continuous HER at 300 mA cm −2 for 24 h, outperforming the commercial Pt/C catalyst. The research provides a novel approach to designing high-performance amorphous alkaline HER electrocatalysts cost-effectively and contributes insights for understanding and developing advanced amorphous catalysts across various applications.
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Amir Abdul Razzaq,Ganwen Chen,Xiaohui Zhao,Xietao Yuan,Jiapeng Hu,Ziwei Li,Yufeng Chen,Jiabin Xu,Rahim Shah,Jun Zhong,Yang Peng,Zhao Deng
Sulfurized polyacrylonitrile (SPAN) represents a unique class of cathode material for lithium sulfur (Li-S) batteries as it eradicates the polysulfides shuttling issue in carbonate-based electrolyte. However, due to the essential chemical S-linking and organic nature of SPAN, the active mass percentage and rate capability are two bottleneck issues preventing its ultimate deployment outside of laboratories. In the current work, aiming to endow both the charge conductivity and catalytic activity to SPAN for maximizing the redox kinetics of S conversion, a freestanding nanofibrous SPAN cathode embedding conductive CNTs and atomically dispersed Co centers is fabricated via multivariate electrospinning. While the CNTs enable dramatically enhancing the fiber conductivity and generating mesoscopic porosity for facilitating charge and mass transportation, the cross-linking of SPAN by Co-N 4 S motifs creates extra charge conduction pathways and further serves as the catalytic active sites for expediting redox S conversion. As a result, an extraordinary Li-SPAN performance is achieved with a high specific capacity up to 1856 mAh g −1 @0.2 C, a superb rate capability up to 10 C, and an ultra-long battery life up to 1500 cycles@1 C. Consequently, our study here provides insights into the adoption of coordination chemistry to maximize the sulfur utilization by ensuring a more complete redox conversion from SPAN to Li 2 S, and vice versa .
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Wang Dewei,Wang Shuangyu,Sun Jiaqi
Exploration of non-corrosive chemical activation agents that are capable of transforming sustainable biomass into nanocarbon with large specific surface area and suitable heteroatomic content for electrochemical energy storage applications is highly desired. Herein, potassium peroxodisulfate (K 2 S 2 O 8 ) has been proposed as the effective activation agent for the synthesis of N, S co-doped carbon nanosheets (N, S-CNSs) from renewable onions. Different from the other activation agents, it was found that the K 2 S 2 O 8 can act as the physical activating agent and chemical activating agent simultaneously owing to its temperature-dependent decomposition behavior. Consequently, the N, S-CNSs with large specific surface area of 2110.6 \({\mathrm{m}}^{2}{\mathrm{g}}^{-1}\) , optimal oxygen, nitrogen, and sulfur-containing functional groups were rationally emerged. The assembled Zn-ion hybrid supercapacitors with the as-prepared N, S-CNSs delivered a maximum specific capacity of 141.5 mAh \({\mathrm{g}}^{-1}\) , robust cycling stability with 98.3% capacity retention after 20,000 cycles, and large specific energy up to 113.4 Wh k \({\mathrm{g}}^{-1}\) . As explicitly discussed with the relevant characterizations, the study deeply explored the adaptability of the chemical activating agent in general synthesis of porous carbon-based materials from sustainable biomass, and great insight for designing high-performance electrochemical energy storage devices.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 4
·1743-1755
·
IF 2.817
Akbar Abdul Rehman,Wu Jinxing,Tahir Muhammad,Hu Huihui,Yu Chen,Qadir Muhammad Bilal,Mateen Fahad,Xiong Chuanxi,Yang Quanling
To push the upper limit of capacitive materials, the integration of multi-modal capacitive materials has emerged as a potential solution. In this regard, we reported the novel binary composite of self-suspended polyaniline (S-PANI) and multi-walled carbon nanotubes (MWNTs). Compared with conventional polyaniline, S-PANI offers higher porosity and fibrillar polymeric network, which was achieved by doping long-chain protonic acid during in situ polymerization. S-PANI was loaded on oxidized carbon nanotubes (OCNTs) and sulfonated carbon nanotubes (SCNTs) to prepare S-PANI/OCNT and S-PANI/SCNT composite electrodes, respectively. The conductive and exclusive fibrillar S-PANI provide unobstructed channels for charge transport and electrolyte infiltration. Preliminary electrochemical studies revealed that the capacitance of the composite electrode reached 316.8 F g −1 and 345.4 F g −1 , and established exceptional capacitance retention rates of 92.8% and 93.7% after 5000 cycles for S-PANI/OCNT and S-PANI/SCNT composite, respectively, making it a potential candidate for imminent energy storage devices.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 109
·64354-64363
·
IF 3.708
Liangliang Qu,Lijing Wang,Ximing Xie,Guozhu Yu,Shaohua Bu
A series of modified solution-polymerized styrene butadiene rubbers (M-S-SBRs) with different molar contents of polar groups were prepared through grafting 3-mercaptopropionic acid into solution-polymerized styrene butadiene rubber (S-SBR) chains. The molar contents of the polar groups in M-S-SBR were calculated using 1H nuclear magnetic resonance (1H NMR) spectroscopy. Thermodynamic analytical methods, including the surface energy of M-S-SBR and filler flocculation, show that the introduction of polar groups increases the work of adhesion of filler–rubber (Wrf), which is an indicator for the compatibility of the filler with rubber. The thermodynamic results can be further proved by TEM micrographs. Strain sweep experiments were carried out to investigate the temperature dependent nonlinear strain-dependence of elastic moduli, referred to as the Payne effect. The filler–filler network and interfacial strength were studied in terms of critical strain γc and activation energy Ea. Dynamic mechanical measurements show that a combination of higher energy dissipation in the low temperature range and higher elasticity in the high temperature region were achieved for M-S-SBR/Silica when compared with their non-modified counterpart.
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高影响因子
危险品化学品经营许可证（带存储）