INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 8
·3284-3294
·
IF 3.343
Xiaoyang Wan,Xuefeng Wei,Juan Miao,Ruichang Zhang,Jun Zhang,Qingshan Jason Niu
Summary A wide compositional range of Pd-Ni/Cd on polypyrrole (PPy)-modified Ti plates (Pd-Ni/Cd/PPy/Ti) was fabricated via electrochemical deposition. The hydrogen absorption properties of the prepared Pd-Ni/Cd/PPy/Ti electrodes were evaluated using cyclic voltammetry and chronoamperometry in acidic media. The optimal Pd 36 -Ni 7 /Cd 57 /PPy/Ti electrode achieved a hydrogen storage capacity of 331.3 mC cm −2 mg −1 and an H/Pd ratio of 0.77. The enhancement of the hydrogen storage was attributed to a synergistic effect between the Pd-Ni/Cd catalysts. The surface morphology, crystallinity, and chemical composition of the Pd-Ni/Cd/PPy/Ti electrode were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. Hydrogen spillover occurred on the trimetallic catalysts, and secondary hydrogen spillover occurred on the PPy/Ti support. The enhanced hydrogen sorption capacity was due to both the synergistic effect of the trimetallic catalysts and the assistance of PPy, making Pd-Ni/Cd/PPy/Ti a promising hydrogen storage material.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 10
·14720-14731
·
IF 5.164
Yang Zhan,Qing Wang,Shao-Hua Luo,Si Li,Luo-Xuan Wang,Xin Liu,Ya-Hui Zhang,Long-Jiao Chang
Summary The lithium transition metal orthosilicates (Li 2 MnSiO 4 ) compounds are considered key materials for the next-generation lithium-ion batteries (LIBs). However, they exhibit poor electronic conductivity and structural stability. Herein, the dual-phase ( Pmn2 1 , and Pn ) coexisting Li 2 Mn 1− x Ni x SiO 4 @C is prepared successfully via a two-step calcination process to address the aforementioned problems. The orthorhombic Pmn2 1 and Pn phase are expected to bring well solid-state Li diffusion properties (D Li + ) and structural stability for electrode material, respectively. Also, the Ni doping and carbon coating are expected to raise electronic conductivity. Then, the electrochemical performance of LIBs utilizing LiMn 0.995 Ni 0.005 SiO 4 @C, LiMn 0.985 Ni 0.015 SiO 4 @C, and LiMn 0.92 Ni 0.08 SiO 4 @C (ZNi-02 to ZNi-04) as cathode materials are investigated and compared with that of the LiB using Li 2 MnSiO 4 @C (ZNi-01). The ZNi-04 sample-based LiB shows well D Li + and a peak discharge capacity as high as 188.4 mAh g −1 . In addition, the ZNi-04 sample can still maintain a capacity of about 80 mAh g −1 at rate of 8 C. Such excellent electrochemical performance is ascribed to the synergistic effect of the dual-phase coexistence, the proper amount of Ni doping, and surface coating of carbon, which enhances the electrical conductivity and structural stability. Thus, Li 2 Mn 1− x Ni x SiO 4 @C has broad application chances as a high-performance LIBs electrode material.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 44
·期 2
·1167-1178
·
IF 3.343
Weimin Chen,Min Luo,Xin Wang,Kai Yang,Xiaoyan Zhou
Summary It is a great challenge to simultaneously achieve high yield, high nitrogen retention, and low cost for chitin-based porous carbons (PCs) while obtaining highly porous structure. Herein, copper (II) chloride dihydrate (CuCl 2 2H 2 O) is innovatively used as the microwave absorber and also porogen for direct synthesis of PCs from chitin via microwave heating. A very short duration of 10 minutes is achieved for this synthesis, because microwave irradiation renders a rapid heating rate of 126°C min −1 during the initial 5 minutes. In addition, the melted CuCl 2 wraps the chitin to preserve its overall structure during synthesis, thus obtaining a yield as high as 36% and a nitrogen retention up to 5.2%. Furthermore, a low temperature of about 600°C that triggers the redox reactions of CuCl 2 into Cu to achieve well-developed porous structure (specific surface area up to 1535 m 2 g −1 ) is observed, suggesting a merit of low cost for this synthesis. The PC-based electrode exhibits not only a high specific capacitance of 227 F g −1 at 0.5 A g −1 in 6 mol L −1 KOH electrolyte but also a good rate capability with a high capacitance retention of 67.7% even at an ultra-high current density of 50 A g −1 . Owing to these promising capacitive performances of PCs, the fabricated supercapacitor can remain 70.1% of the energy density when the power density was dramatically increased by 20 times.
研究领域:
材料科学
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能源技术
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 4
·6041-6053
·
IF 3.741
Yanfang Xie,Fuzhong Wu,Xinyi Dai,Yi Mai,Yijing Gu,Huixin Jin,Junqi Li
Summary Nickel-cobalt-manganese ternary cathode materials are known as one of the most promising future cathode materials for Li-ion batteries (LIBs) due to their high discharge capacity, environmental friendliness, and low cost. In this paper, submicron LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) primary particles with good crystallinity and dispersibility have been synthesized combine a coprecipitation method used ethanol as solvent with solid-phase sintering technology. A feeding strategy through separate dropping of sodium carbonate and ammonia is adopted; the structure and properties of NCM523 under different pH conditions are investigated. It is found that the NCM523 synthesized at pH = 8 (NCM523-8) exhibits a uniform particle size of about 300 nm, with good crystallinity. The NCM523-8 exhibits an excellent high-potential cycling performance, with an initial discharge capacity of 193.6 mAh g −1 at 0.2 C in the voltage of 3.0 to 4.5 V, and the capacity retention is 91% after 100 cycles. It also shows excellent rate performance with a reversible capacity of 130 mAh g −1 at 5 C. The superior high-potential electrochemical performance is attributed to the improved lithium-ion diffusion coefficient and stabilized structure by the special structural characteristics as evidenced by cyclic voltammetry, electrochemical impedance spectroscopy, and X-ray diffraction.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 45
·期 4
·6426-6435
·
IF 3.741
Yuhan Qiang,Lei Zhang,Shaofeng Shao,Jingfa Li
Summary The photo-responsive capability of lithium battery materials is a prerequisite to realize new-generation light-weight photo-rechargeable batteries. However, the photo-charging property is not available for common battery electrode materials such as LiFePO 4 . In this manuscript, we provide evidence that the halide perovskite material CH 3 NH 3 PbI 3 is able to activate the photo-charging properties of the lithium-ion battery electrode material LiFePO 4 . The photoelectrochemical measurement demonstrates that the photo-responsive property of the CH 3 NH 3 PbI 3 /LiFePO 4 composite is significantly improved; the photo-induced signals are neither observed in the individual halide perovskite nor the lithium battery material tested under the same condition. The first-principles calculations reveal strong interactions between the CH 3 NH 3 PbI 3 layer and the LiFePO 4 layer via the coordination between the Lewis acid and Lewis base species; this forms a heterostructure that assists the photo-charging process. We propose that the combination of halide perovskite materials and lithium battery electrode materials is a viable way to achieve light-weight photo-batteries. Suggestions to address the stability and voltage issues of the halide perovskite-based hybrid systems toward the photo-battery application are provided. This study facilitates the fundamental understanding of the integrated photo-rechargeable battery materials and highlights the importance of halide perovskite materials for the lithium-ion and photo-rechargeable batteries.
研究领域:
材料科学
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能源科学
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光电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 15
·24148-24157
·
IF 4.672
Zhiyong Fu,Yifan Li,Joan Papavasiliou,Yijing Xing,Lei Liu,Zhuoqun Li,Li Chen,Haibin Li
Summary In this study, two kinds of membrane electrode assembly (MEAs) based on the CsH 5 (PO 4 ) 2 -doped polybenzimidazole (PBI) membrane and fabricated by the catalyst-coated membrane (CCM) method are reported. In the first one, named Type-GDL/PA MEA, phosphoric acid (PA) is sprayed onto the surface of the gas diffusion layer (GDL), and in the second one, named Type-CL/PA MEA, PA is sprayed onto the surface of the catalyst layer (CL). The results show that the Type-CL/PA MEA exhibits significantly higher performance than the Type-GDL/PA MEA, providing the highest peak power densities of 620 and 413 mW cm −2 at 180°C under humidified H 2 /O 2 and H 2 /air fuel cell conditions, respectively. Moreover, their performance is promoted in the presence of humidified gas feed streams as compared to dry gas conditions at the same temperature. The electrochemical impedance spectroscopy (EIS) analysis indicates a lower charge transfer resistance for the Type-CL/PA MEA as compared to the Type-GDL/PA MEA. The former MEA also presents higher stability, as confirmed by a 100 h durability test, resulting in a voltage degradation rate of 0.17 mV h −1 , which is much lower than the corresponding voltage drop of 0.71 mV h −1 for the Type-GDL/PA MEA. Novelty statement CCM-type MEAs for HT-PEMFC are studied. CCM-type MEAs with a CsH 5 (PO 4 ) 2 -doped Polybenzimidazole membrane are prepared. Type-GDL/PA MEA is to spray phosphoric acid onto the gas diffusion layer (GDL). Type-CL/PA MEA is to spray phosphoric acid onto the catalyst layer (CL). Type-CL/PA MEA exhibits significantly higher performance than Type-GDL/PA MEA.
研究领域:
能源科学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 10
·14985-14994
·
IF 5.164
Siqi Qiu,Renbo Guo,Qingyu Wang,Feng Yang,Yibo Han,Xiaoniu Peng,Hui Yuan,Xina Wang
Summary P-type Ni(OH) 2 has been combined with n-type CdS nanorods and nanocrystals for enhanced photocatalytic property due to the p-n junction. Though CdS nanosheets exhibit fast charge transfer and large superficial area, the decoration of Ni(OH) 2 was rarely reported up to now. In this work, the photo-deposition of Ni(OH) 2 nanoparticles on CdS ultrathin nanoflakes was established for efficient photocatalytic H 2 generation. By changing the irradiation time of CdS, the reaction between Ni 2+ and OH − can be controlled for different loading density of Ni(OH) 2 . As the loading density-dependent morphology, light absorption, carrier separation and transfer were systematically studied for the composites, an obvious band gap narrowing from 2.28 to 2.08 eV was revealed, and the carrier separation and transfer between the CdS nanoflakes and Ni(OH) 2 nanoparticles have been enhanced for the composites with deposition time of 3 minutes. These together with the alignment of type “II” bands and the high specific surface area of the flakes and nanoparticles, lead to an optimum H 2 generation of 20.14 mmol/g/h, nearly three times of pure CdS (7.97 mmol/g/h). Such a study not only provides a deposition method of Ni(OH) 2 , but also sheds light on the enhancement strategy for photocatalytic property by controlling the microstructure and aligning the hetero-structured bands.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 3
·1121-1132
·
IF 3.343
Yue Zhang,Jinhe Sun,Guixiang Ma,Zhao Wang,Shaolei Xie,Yan Jing,Yongzhong Jia
Summary Expanded graphite (EG) has shown excellent performances in compression resilience, thermal conductivity, and adsorption ability. EG can adsorb liquid phase change materials (PCMs) mainly because of capillary action; however, EG is hydrophobic, which makes it less compatible with hydrated salts. Herein, hydrophilic EG (HEG) was prepared with Triton X-100 (TX-100) as surface modifier. The HEG–magnesium nitrate hexahydrate (HEG-MNH) composite as a PCM was investigated for thermal energy storage (TES) to understand the effect of hydrophilic modification on thermophysical properties. The powder-state HEG is added into MNH to prepare HEG-MNH composite PCM, which contains 1.71 wt% of TX-100, 7.29 wt% of EG, and 91.00 wt% of MNH by control variable method. The melting point and latent heat of HEG-MNH composite PCM were 89.05°C and 137.28 J/g, respectively. The endothermic enthalpy change of HEG-MNH composite PCM only decreased by 0.90%, along with the exothermic values of HEG-MNH composite that increased by 3.80% after 100 cycles. The thermal conductivity is higher 5.17 times than that of the pure MNH. Our work suggests that the HEG-MNH composite PCM has a great potential to be used as a PCM for TES.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 9
·7630-7644
·
IF 3.741
Xinying Qiao,Sining Yun,Feng Han,Yongwei Zhang,Asim Arshad,Brundha Chidambaram,Ziqi Wang,Nosheen Zafar,Yiming Si,Jingwen Li
Summary Finding an inexpensive and effective clean energy electrocatalyst is highly important for the new generation of photovoltaic devices. Herein, we report a facile and universal in situ co-precipitation strategy to load three novel tantalum-based compounds (NiTa 2 O 6 , MnTa 2 O 6 , and AlTaO 4 ) on honeycomb-like bio-based carbon (HBC) frameworks. The HBC framework with unique honeycomb-like network structure serves as a support material in nanohybrids that can provide rich surface active sites and rapid electron transport channels for triiodide reduction reaction. The adoption of widely available and abundant biomass-derived carbon into tantalum-based compounds markedly boosts electrocatalytic properties of nanohybrids and exhibits robust corrosion resistance because nanohybrids adequately utilize the synergistic effects of different components. The photovoltaic devices fabricated with NiTa 2 O 6 /HBC, MnTa 2 O 6 /HBC, and AlTaO 4 /HBC counter electrode catalysts demonstrate the brilliant power conversion efficiency (PCE) of 7.09%, 7.39%, and 7.86%, respectively, outperforming the Pt-based cells (6.80%). This work offers a strategy for the further rational design of efficient, inexpensive, and durable electrocatalysts for advanced energy technology applications.
研究领域:
材料科学
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能源技术
·
催化化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 46
·期 4
·4794-4807
·
IF 5.164
Shoulei Miao,Zhenrong Liu,Haiqiu Zhang
Summary 1,2,4-triazole is successfully grafted onto C═C bonds of graphene oxide surface with retained carboxylic acid, hydroxy, and epoxy groups. The structure of the resulting 1,2,4-triazole-doped graphene oxide (NGO) is proved by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy spectra. The polybenzimidazole (PBI)/NGO composite membranes (NGO content:0.5%, 1%, 3%, 5%) were also prepared and subjected to the absorption of various suitable amounts of phosphoric acid (PA). As expected, the composite membranes well maintained their superior mechanical properties (57-69 MPa) containing 2 PA molecules per PBI unit. The morphological characterization using the atomic force microscopy phase images and transmission electron microscopy analysis revealed a micro-phase separation, providing continuous ionic channels and ultimately enhancing the ionic conductivity. As a result, the maximum proton conductivity of 27 mS cm −1 is achieved for PBI/NGO-3 membrane (NGO content: 3%) at 160°C under anhydrous conditions, and the maximum power density of the cell using PBI/NGO-3 membrane is 254 mW cm −2 . These composite membranes displayed great potential for high-temperature proton exchange membranes under anhydrous conditions. The scanning electron microscopy images further showed the condensed structures with the suitable quantity of NGO in the composite membranes due to the hydrogen bonding and acid–base interactions between NGO and PBI. This condensed structure improved the mechanical properties, enhanced thermal stability, and increased oxidative stability of the composite membranes. Additionally, the PBI/NGO/PA composite membranes exhibit high thermal decomposition temperature (Td[5%] higher than 284°C) and superior tensile strengths (greater than 55 MPa). Remarkably, the membranes demonstrated exceptional oxidative stability and could maintain less than 15% quantity loss for more than 200 hours in Fenton's reagent (3 wt% H 2 O 2 , 4 ppm Fe 2+ ). Novelty statement The manuscript entitled “Enhanced Performance of High-Temperature Proton Exchange Membrane by Introducing 1,2,4-Triazole Functionalized Graphene Oxide into Polybenzimidazole” was written by Haiqiu Zhang In this work, 1,2,4-triazole is successfully grafted onto graphene oxide nanosheets by C═C bonds without damaging other groups, and condensed structure improved the oxidative stability effectively, meanwhile, with the low-acid-loaded quantity and gained higher proton conductivity under anhydrous condition.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 11
·16538-16550
·
IF 5.164
Sanchao Liu,Huihui He,Dongyun Zhang,Chengkang Chang
Summary To improve the electrochemical performances of high voltage LiCoMnO 4 spinel cathode material at 5.3 V, Cr doped LiCoMn 1-x Cr x O 4 ( x = 0, 0.025, 0.050, 0.075) materials were synthesized by a one-step solid-state at 750°C. Rietveld refinement results showed that the phase purity of spinel is promoted with the increase in Cr concentration, which can be explained by the strong Cr O bond that reduces oxygen deficiency and eliminates Li 2 MnO 3 impurity phase during the synthesis process. Such change in phase purity further causes the improvement in specific capacity, and the 5.0%Cr doped sample displays the best result with a value of 123.0 mAh/g at 0.1°C and 93.3 mAh/g at 10°C. For a comparison, the pristine sample only releases a capacity of 112.6 mAh/g at 0.1°C and 54.8 mAh/g at 10°C. Improved capacity retention, from 83.1% to 90.1% after 100 cycles at 1°C, is also observed due to the suppressed volume change during the redox process after the incorporation of Cr cations in the lattice. Promoted rate performance, attributed from the improved Li ion diffusion coefficient, is also confirmed in the experiment. The improvement of those electrochemical properties could be explained by high-phase purity and superior structural stability benefited from Cr-doping. Novelty statement LiCoMn 1-x Cr x O 4 ( x = 0, 0.025, 0.050, 0.075) materials were synthesized by a one-step solid-state at 750°C, Chromium had been confirmed to reduce oxygen loss during LiCoMnO 4 synthesis due to high oxygen affinity of Cr, which improves phase purity. As a result, the specific capacity was increased. Cr-doping enhances the structural stability so that capacity retention was promoted due to higher bond energy of Cr O than Mn O; rate performance was also enhanced due to the improved diffusion coefficient.
研究领域:
材料科学
·
电化学
·
储能
·
固态化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 11
·8904-8918
·
IF 3.741
Shang Liu,Congliang Huang
Summary Although various special materials have been exploited for enhancing evaporation performance of a solar vapor generation system, their practical applications could be greatly limited by structure destruction due to the seawater corrosion and external mechanical forces. In this work, we have developed a carbon black/polyethyleneimine-bacterial cellulose (CPB) membrane with vacuum filtration method to simultaneously enhance the strength and evaporation performance of solar vapor generation system, by applying carbon blacks as the photo-thermal conversion material, bacterial cellulose as the skeleton material for enhancing the structure strength, and polyethyleneimine (PEI) for tailoring the water absorption capacity. Effects of carbon black particle concentrations and PEI concentrations were probed, respectively, for optimizing the light absorption capacity and water absorption capacity in laboratory. Furthermore, the outdoor experiments were carried out to evaluate the strength and evaporation performances of CPB membrane. Results show that the evaporation efficiency of the CPB membrane could reach about 85.05% and 81.89% in the lab and outdoor under one sun irradiation. Additionally, a force of 59.37 MPa and folding more than 100 times will not break the structure of CPB membrane, which confirms the preferable structure strength. This superior CPB membrane, together with its low cost, simple fabrication, excellent mechanical properties, scalability and desalination ability, provides a feasible way for practical applications.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）