INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2018
·Vol. 43
·期 1
·568-579
·
IF 3.009
Su Xianbo,Hong Jiangtao,Xia Daping,Zhao Weizhong
Summary Organic liquid intermediates were generated during the coal-to-biohydrogen fermentation process. The study on the generation of these organic liquid intermediates can provide information on the biogenic gas formation mechanism. In this paper, high volatile bituminous coal from Yima colliery was collected as an effective carbon source. The indigenous microflora extracted from a coal mine water was used as the bacterial source to set up simulation experiment to get biogenic gas. Then, gas chromatography and ultraviolet spectrophotometry, combined with liquid-liquid extraction gas chromatography–mass spectrometry, were used to analyze the gas composition, as well as the production of saccharide, pyruvic acid, and volatile intermediates in the bioreactor fluids. The results show that the gases generated from the fermentation experiment contained hydrogen, carbon dioxide, and nitrogen. Twelve volatile component types were detected in the bioreactor fluids: straight alkanes, branched alkanes, alkenes, alcohols, aldehydes, ketones, acids, lipids, amines, quinolones, phenols, and epoxy alkanes. The key components of organic intermediates produced were saccharides, pyruvic acid, organic acids and alcohol, straight alkanes, and amide. Saccharides, pyruvic acid, alkanes, and organic acids were closely related to the generation of hydrogen and carbon dioxide, whereas amide stimulated nitrogen generation. Three stages are divided in the fermentation process. The first stage is hydrolysis, where the total, reducing, and polysaccharides production reached a maximum, with generation of long-chain fatty acids as well as other liquid organics. The second stage is hydrogen production stage, which includes peak hydrogen production and hydrogen production stabilization stages. In the peak hydrogen production stage, saccharide production rapidly decreases, with an initial increase and subsequent decrease in pyruvic acid, straight alkanes, and branched alkanes. With the production of acetic acid and hydrogen, carbon dioxide production was initially slow but then rapidly increases. In stabilization of hydrogen generation stage, the saccharides were mostly consumed, pyruvic acid and branched alkanes' production increased slowly, but straight alkanes' production continued to decrease. In this stage, the production of acetic acid, hydrogen, and carbon dioxide was relatively stable, and the production of amide and nitrogen increased slowly. The third stage is the homoacetogenic stage, where pyruvic acid and branched alkane production continued to increase and straight alkanes' production continued to decrease. The pyruvic acid production increased abnormally, while amide and nitrogen production began to decrease and gas production nearly terminates. The liquid phase intermediate plays an important role in the coal-fermenting hydrogen generation process and in revealing the hydrogen generation mechanism.
研究领域:
能源微生物学
·
生物氢生产
·
发酵技术
·
煤的生物降解
·
环境生物技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 46
·期 5
·5963-5972
·
IF 5.164
Guoru Li,Xiaoting Yu,Fengxiang Yin,Zhiping Lei,Xinran Zhao,Xiaobo He,Zhichun Li
Summary To reduce the overpotential of electrocatalytic oxygen evolution reaction (OER) for high-efficiency water splitting, a series of 2 to 5 nm ultrafine spinel Co 3 O 4 nanoparticles (NPs) with varied amount of lattice-doped Te (XTe-Co 3 O 4 , X represents the nominal molar ratio Te/Co of 0, 2, 4, 6, 8%) as catalysts were prepared through a simple hydrothermal synthesis method. The 6%Te-Co 3 O 4 catalyst was optimized to obtain the overpotential as low as 313 mV at 10 mA cm −2 , a small Tafel slope of 75 mV dec −1 in 1 M KOH for OER, outperforming this series and many reported Co 3 O 4 -based catalysts. Te doping introduced lattice distortion and resulted in smaller size of Te-Co 3 O 4 NPs with enlarged surface area for more accessible active sites. Oxygen vacancies were created to modify the electronic structure, improve the active sites density, and decrease the kinetic energy barriers of XTe-Co 3 O 4 . The electronic conductivity of 6%Te-Co 3 O 4 was improved to accelerate the charge transfer efficiency. All these effects contributed to promoting the reaction kinetics and minimizing the OER overpotentials for high-performance electrocatalysis.
研究领域:
材料科学
·
电催化
·
能量转换
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 13
·7614-7626
·
IF 3.343
Mangmang Shi,Yinglin Yan,Yiqi Wei,Yiming Zou,Qijiu Deng,Juan Wang,Rong Yang,Yunhua Xu,Tong Han
Summary Carbon aerogel (CA), possessing abundant pore structures and excellent electrical conductivity, have been utilized as conductive sulfur hosts for lithium-sulfur (Li-S) batteries. However, a serious shuttle effect resulted from polysulfide ions has not been effectively suppressed yet due to the weak absorption nature of CA, resulting in rapid decay of capacity as the cycle number increases. Herein, ultrafine (~3 nm) gadolinium oxide (Gd 2 O 3 ) nanoparticles (with upper redox potential of ~ 1.58 V versus Li + /Li) are uniformly in-situ integrated with CA through directly sol-gel polymerization and high-temperature carbonization. The Gd 2 O 3 modified CA composites (named as Gdx-CA, where x means molar ratio of Gd 2 O 3 nanoparticles to carbon) are incorporated with S. Then, the products (S/Gdx-CA) are acted as sulfur host materials for Li-S batteries. The results demonstrate that adding ultrafine Gd 2 O 3 nanoparticles can dramatically improve the electrochemical properties of the composite cathodes. The S/Gd2-CA electrode (loading with 58.9 wt% of S) possesses the best electrochemical properties, including a high initial capacity of 1210 mAh g −1 and a relatively high capacity of 555 mAh g −1 after 50 cycles at 0.1 C. It is noteworthy that the performance of long-term cycle (350 cycles) for the S/Gd2-CA (317 mAh g −1 after 100 cycles and 233 mAh g −1 after 350 cycles at 1 C) is improved significantly than that of S/CA (150 mAh g −1 after 150 cycles at 1 C). Overall, the enhancement of electrochemical performances can be due to the strong polar nature of the ultrafine Gd 2 O 3 nanoparticles, which provide strong adsorption sites to immobilize S and polysulfide. Furthermore, the Gd 2 O 3 nanoparticles present a catalytic effect. Our research suggests that adding Gd 2 O 3 nanoparticles into S/CA composite cathode is an effective and novelty method for improving the electrochemical performances of Li-S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米科技
·
无机非金属材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2026
·Vol. 2026
·期 1
·3671058
·
IF 4.2
Zihou Tian,Ziying Shao,Yukang Zheng,Pengfei Ban,Jiace Xue,Jinliang An
Phase change microcapsules (MCs) demonstrate significant application potential in thermal energy storage. However, conventional single-component shell materials exhibit limitations, including low mechanical strength, poor thermal conductivity, and inadequate sealing performance. In this study, octadecane was used as the core material, and four kinds of MC systems were constructed by interfacial polymerization and in situ polymerization: melamine–urea–formaldehyde (MUF) single shell, polyurea (PUA) single shell with nano-SiO 2 as Pickering emulsifier, MUF inner shell/PUA outer shell double shell, and PUA inner shell/MUF outer shell double shell. The packaging efficiency, thermal conductivity, leakage rate and heat-transfer characteristics of different structures are systematically compared. The results show that the comprehensive performance of the PUA inner shell/MUF outer shell double-shell structure is the best, the packaging efficiency is 76.2%, the thermal conductivity is 9.35% higher than that of pure PUA single shell, and the leakage rate is as low as 3.35% at 50°C for 20 h. The transient heat conduction simulation of ANSYS Fluent reveals the performance improvement mechanism: the heat conduction network formed by self-assembly of nano-SiO 2 at the oil–water interface accelerates the heat transfer, and the double-shell synergistic effect of “flexible inner shell attached to the core material and rigid outer shell provided protection” significantly inhibits the core material leakage. The collaborative optimization strategy of shell structure design and nano-Pickering emulsification proposed in this study provides a new technical path for realizing high sealing, high strength, and high thermal conductivity of phase change MCs at the same time and has application value in the fields of building energy saving and thermal management of electronic equipment.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 2
·3129-3141
·
IF 3.741
Xuelian Zhang,Ke Wang,Xin Zhang,Jianjiang Hu,Mingxia Gao,Hongge Pan,Yongfeng Liu
Summary High operation temperatures and slow reaction kinetics are major obstacles to use MgH 2 as a solid hydrogen store. We report here the synthesis of Nb 2 O 5 hollow spheres (o-Nb 2 O 5 ) with wall thickness of approximately 50 nm and mossy surfaces using a facile hydrothermal and calcination process, which showed high activity in catalysis of MgH 2 for hydrogen storage. The dehydrogenation onset temperature of MgH 2 was decreased to 195°C with 7 wt% of o-Nb 2 O 5 . More than 5.5 wt% H 2 can be desorbed at 300°C within 5 minutes. Hydrogen re-absorption starts even at 25°C and reaches 5.6 wt% within 5 minutes at 200°C. Practical hydrogen capacity stabilizes at 5.8 wt% after 10 cycles of hydrogen uptake/release. The o-Nb 2 O 5 was found to be reduced in situ by MgH 2 to low-valence Nb species during the initial dehydrogenation process, which functions as an active catalyst and leads to the enhanced dehydrogenation kinetics.
研究领域:
材料科学
·
催化
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 15
·23480-23492
·
IF 4.672
Lingxin Meng,Zhenguo Zhang,Mengchi Ju,Jingmei Xu,Zhe Wang
Summary Organic-inorganic modification by incorporating metal-organic frameworks to copolymers is one strategy to advance the properties of membranes. Here, the imidazole-loaded MIL-101-NH 2 (Im@MIL-101-NH 2 ) was prepared and chemically anchored onto sulfonated poly (arylene ether ketone sulfone) containing carboxyl groups (C-SPAEKS). The chemical stabilities, mechanical properties, and dimensional stabilities of compound membranes were increased. The highest tensile strength of C-SPAEKS-IM6 reach to 105.36 MPa. The weight retention rate of hybrid membranes was still higher than 90% after the oxidation stability test at 80°C. Furthermore, the introducing Im@MIL-101-NH 2 could construct new proton transport paths, and the amphiphilic imidazole molecules embedded inside Im@MIL-101-NH 2 could act as proton carriers. The C-SPAEKS-IM6 showed a maximum proton conductivity of 0.082 S cm −1 at 90°C. Additionally, the peak power density of C-SPAEKS-IM6 was 171.52 mW cm −2 . To sum up, this series of membranes have latent capacity in the application of fuel cells. Im@MIL-101-NH 2 was anchored on polymer backbones via the Hinsberg reaction. Chemical bonds between MOFs and polymer chains improved compatibility of two phases. Cross-linking structure enhanced the mechanical property and oxidative stability. The sulfonamide groups could devote protons and transport it to MOFs.
研究领域:
材料科学
·
化学
·
能源工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 11
·15174-15181
·
IF 4.672
Yang Liu,Xuesong Cai,Dinggui Chen,Yan Qin,Yuan Chen,Jinxiang Chen,Chenglu Liang
Summary The large-scale applications of energy storage system via lithium-ion batteries (LIBs) put forward demands for high capacity, high safety, and low cost of materials. Covalent organic polymers have attracted extensive attention because of their high capacity, flexible structural design, high safety, abundance, and low cost. Here, 2,3,5,6-tetraamino-p-benzoquinone and hexaketocyclohexane octahydrate were chosen as monomers to construct the covalent organic framework (TH-COF) cathode materials with active C=O and C=N groups. The TH-COF was further composed with reduced graphene oxide (rGO) and the prepared TH-COF/rGO cathode provided a capacity of 135 mAh g −1 after 600 cycles at 1 C current density. In addition, after 100 cycles, the cathode delivered capacities of 118 and 73 mAh g −1 at the high current densities of 5 C and 20 C, respectively, displaying superior rate performances. The TH-COF/rGO electrode exhibited high capacity and stability, making it a promising cathode material for the next generation LIBs.
研究领域:
材料科学
·
能量存储
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 12
·17056-17067
·
IF 4.672
Tao Lyu,Shiying Lin,Lanlan Mo,Feijun Wang,Ziqiang Shao
Summary Natural polyelectrolyte complex has designable structure, unique advantages of composite and strong intermolecular or intramolecular force without chemical cross-linking agents, showing the advantages of good biodegradability and low toxicity. This work reports an application research of natural polyelectrolyte in energy storage device. A multi-doped hierarchically porous carbon is fabricated from polyelectrolyte of sodium lignosulfonate and chitosan and used as electrode material of supercapacitor. The material characterization reveals its large specific surface area of 1768 m 2 g −1 , pore volume of 0.94 cm 3 g −1 with optimum 3D porous structure, and high heteroatom (oxygen, nitrogen, and sulfur) concentration. Benefit from these, the electrodes it made exhibit 354 F g −1 specific capacitance at 1 A g −1 current density, outstanding rate retention of 82.9% at a testing environment of 20 A g −1 , and 97.8% capacitance retention in 3 M KOH electrolyte after 10 000 cycles. Using this material, all-solid symmetric supercapacitor devices show 30.11 Wh kg −1 energy density at 520.88 W kg −1 power density and retains 20.90 Wh kg −1 at 1.03 kW kg −1 . These remarkable electrochemical performances prove the promising porous carbon in this work as electrode material with excellent performance for supercapacitors.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
·
碳材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 11
·8555-8566
·
IF 3.741
Li Yang,Yanping Yuan,Nan Zhang,Yanfang Dong,Yafen Sun,Wenhui Ji
Summary To make better use of solar energy, lauric acid/expanded graphite (LA/EG) composite phase change materials (PCMs) were synthesized to collect and store solar energy as latent heat thermal energy. The results of thermal characteristics show that when the mass fraction of EG is 5%, 10%, and 15%, the latent heat of LA/EG is 164.5, 156.9, and 148.0 J/g, and the thermal conductivity is 2.73, 7.98, and 10.54 W/(m·K). Leakage test shows that LA/EG PCMs with EG mass fraction of 10% and 15% are form stable after phase change. One thousand thermal cycles prove good thermal reliability of LA/EG. TG analysis indicates LA/EG PCMs have good thermal stability within operating temperature range. The Ultraviolet-visible spectra reveal that the absorbance of LA/EG composite PCMs would increase as the mass fraction of EG increases. Photothermal conversion experiment results indicate that the photothermal conversion efficiency of LA/EG composite PCMs increases as the mass fraction of EG increases, and the efficiency can reach 95% when the mass fraction of EG is 15%. Moreover, it was also found that the process of photothermal conversion can be accelerated with stronger illumination intensity or smaller heat transfer size. All the results show that the prepared LA/EG PCMs can convert solar energy into thermal energy and store it in the form of latent heat at the same time, which indicates it has promising prospect in the application of solar energy conversion and storage.
研究领域:
材料科学
·
能源化学
·
热能工程
·
功能材料
·
可再生能源
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 15
·21403-21413
·
IF 5.164
Dong Huang,Qiying Zheng,Kunkun Guo,Xuli Chen
Summary Wearable supercapacitors have broad application prospects in emerging portable devices. To realize the large-scale application, it is necessary to develop a low-cost and large-scale method to fabricate wearable electrode with high electrochemical performance. Here, polyaniline supported by graphene coated polyester textile (PANI/GPT) electrode is prepared through a simple and low-cost method. First, graphene ink with high concentration is prepared, and then the polyester textile is coated by graphene through a repeatedly soaking-drying process. Subsequently, PANI/GPT electrode is prepared by electrochemical deposition of polyaniline (PANI) on graphene coated polyester textile. The ratio of PANI in the textile electrode has been systematically modified and the obtained textile electrode possesses good energy storage performance with specific capacitance reaching 896.50 F g −1 and good rate capability. The assembled flexible supercapacitor also owns excellent flexibility with capacitance retention of 95.10% after bending for up to 5000 cycles. Such high-performance textile electrodes and the low-cost method can be widely applied to develop other wearable energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 7
·10895-10911
·
IF 5.164
Xiangrui Zeng,Lulu Wang,Jilin Wang,Zhiqiang Qu
Summary A series of anion exchange membranes (quaternized chitosan/cation metal-organic framework [MIL-X-QCS]) were prepared via purposeful inserting the cationic metal-organic framework as the multifunctional filler into quaternized chitosan (QCS). The successful preparation of the anion exchange membrane was confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and Scanning electron microscope (SEM). In this research, we converted the charge-balanced MOFs skeleton Cr-MIL-101 into the cationic metal skeleton (Cr-MIL-101) + Cl − by anion stripping, and cooperated with quaternary amine groups to construct a high-speed OH − transmission channel. The introduction of a rigid MOF structure reduces the water uptake and swelling ratio of the composite membrane by 27% and 37%, respectively. At 80°C, the OH − conductivity of the MIL-9-QCS membrane (The composite membrane doped with 9 wt% Cr-MIL-101 crystals) reaches 2.30 × 10 −2 S·cm −1 and the power density reached its maximum (90.2 mW·cm −2 ), and the tensile strength reaches 20.12 MPa, which was higher than 18.7 MPa of Nafion-115 membrane. The spatial network structure of MOFs reduced the methanol permeability of MIL-9-QCS membrane by 24% compared with the original QCS membrane. Furthermore, the MIL-9-QCS composite membrane exhibited excellent alkali stability, where after being soaked in 2 mol L −1 NaOH solution at 60°C for 240 hours, its OH − conductivity still reached 77% of the initial value.
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
·
2022
·Vol. 46
·期 11
·15376-15386
·
IF 4.672
Tianle Li,Siddig Abuelgasim,Wenju Wang,Yupeng Xiao,Chenlong Liu,Yaoyao Ying,Dong Liu
Summary Soot particulate emitting from diesel engines are serious to both human health and environment. Efficient catalyst is vital in diesel particulate filter technology to decrease soot oxidation temperature. Cu 1−x K x Fe 2 O 4 (x = 0, 0.05, 0.1, and 0.15) catalysts are synthesized and analyzed with XRD, Raman, BET, SEM, TEM, TG, EDS, XPS, catalytic activity tests, and kinetic analysis. The results suggests that many factors affect the catalytic activity, and the contents of oxygen vacancies are dominant. A large amount of oxygen vacancies which facilitate to the soot oxidation are created with the assistance of K + , and they increase with the increasing doping contents. Excessive surface concentration of K + may lead to the partially covering of active sites of the catalysts. Therefore, Cu 0.9 K 0.1 Fe 2 O 4 catalyst exhibits the best catalytic activity in soot oxidation, which decreases the T max of soot by 279°C. This decrease makes it highly promising for application in diesel particulate filter.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）