INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
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IF 3.205
Qiong Luo,Mingying Peng,Xuping Sun,Yonglan Luo,Abdullah M. Asiri
Cost-effective bifunctional oxygen- and hydrogen-evolving electrocatalysts made from earth-abundant elements are crucial for efficient water splitting. In this communication, we report a versatile and one-step electrodeposition of NiFe nanosheets film on Ni foam (NiFe/NF) as a bifunctional catalytic material with high activity and stability for overall water splitting in basic electrolytes. The two-electrode electrolyzer using NiFe/NF as both anode and cathode can afford current density of 10 mA cm −2 at a cell voltage of 1.64 V, which stimulates the design and development of transition metal alloy nanostructures as attractive bifunctional catalysts for electrochemical production of hydrogen fuels .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Pengcheng Wang,Jun Liu,Peiwen Xu,Xinzhen Feng,Weijie Ji
Three morphologically uniform γ-Al 2 O 3 crystallites [Al 2 O 3 hexagonal plates (Al 2 O 3 -HP), stacked hexagonal plates (Al 2 O 3 -SHP) and rods (Al 2 O 3 -R)] were controllably synthesized. The Co-Mo oxide precursor was loaded on these γ-Al 2 O 3 substrates via aqueous incipient wetness impregnation and transformed to the sulfides under 10% H 2 S/H 2 (v/v) atmosphere. The mainly exposed facet of Al 2 O 3 -HP and Al 2 O 3 -SHP was identified to be the (1 1 0) and (1 0 0)/(1 1 1), respectively; whereas a polycrystalline structure was observed over Al 2 O 3 -R. The original structural feature of oxide precursors, i.e., 2D polymeric/monomeric as well as 3D polymeric/MoO 3 species substantially varied over Al 2 O 3 -HP, Al 2 O 3 -SHP, and Al 2 O 3 -R, which in turn determines the effectiveness in sulfidation of surface oxide precursors. The richness of MoS 2 /Co 9 S 8 /Co-Mo-S species, and less fraction of partially sulphurated CoMoO x S 2 as well as CoO x /SO x 2− entities were recognized over Al 2 O 3 -HP. Based on the areal activity at 250 °C, the sulfides-Al 2 O 3 (1 1 0) interface is approximately 6–13.8 times more active than the poly-crystalline or commercial γ-Al 2 O 3 supported sulfides for water gas shift (WGS) in a hydrogen-rich stream. The sulfides-Al 2 O 3 (1 1 0) interface also notably outperformed the sulfides-Al 2 O 3 (1 0 0)/(1 1 1) interfaces for the reaction.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ji Mi,Shuaishuai Bai,Lu Zhao,Guijin He,Yongsheng Guo,Hujun Xie,Wenjun Fang
Active cooling of scramjets by endothermic hydrocarbon fuels is considered as an effective approach to addressing the thermal problem for hypersonic aircrafts. To accelerate the endothermic cracking reactions of these fuels for a better cooling capability, a strategy for hydrocarbon cracking using polymer-based macromolecular initiators has been proposed. To verify the universality of this strategy and also to enhance the solubility of macromolecular initiators, a novel polyester macromolecular initiator (MI) is designed. It is clarified that the MI features high-efficient thermal cracking of hydrocarbon fuels in a tubular reactor with an improved conversion ratio, gas yield, and alkene selectivity. The possible mechanism behind the macromolecular initiator is revealed on the basis of intermediate analyses and density functional theory (DFT) calculations, which show the radical fragments from MI decomposition are effective in accelerating JP-10 dehydrogenation. The successful implementation of polyester materials in hydrocarbon fuels holds immense promise for the optimal use of hydrocarbon fuels in hypersonic aircrafts.
研究领域:
航空工程
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Meijie Du,Gang Li
This study describes a method to produce silane-capped boron nanoparticles (NPs) based on surface modification of boron NPs with a silane. These silane-capped boron NPs are highly dispersible in liquid hydrocarbon fuels such as decalin , thus can enhance the energy content of liquid fuels. The experimental conditions for surface modification were optimized. Silane-capped boron NPs were characterized by means of various techniques, such as X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). The results show that the oxide layer resident on the surface of boron NPs is essential to obtain silane-capped boron NPs. The suspension containing silane-capped boron NPs (1 wt%) and decalin are highly stable. No obvious sedimentation was observed even after standing for two months. Silane-capped boron NPs were also stable against air oxidation. The formation mechanism of silane-capped boron NPs was proposed.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Huan Wang,Chonghui Zhu,Xiaohui Yan,Zhaorui Zhang,Huashuai Hu,Mengmeng Xu,Yu Liang,Minghui Yang
Fuel cell gas sensors have emerged as promising advanced sensing devices owing to their advantageous features of low power consumption and cost-effectiveness. However, commercially available Pt/C electrodes pose significant challenges in terms of stability and accurate detection of low concentrations of target gases. Here, we introduce an efficient Cu–Pt/CrN-based fuel cell gas sensor, designed specifically for the ultrasensitive detection of hydrogen sulfide (H2S) at room temperature. Compared to the commercial Pt/C sensor, the Cu–Pt/CrN sensor exhibits excellent sensitivity (0.26 μA/ppm), with an increase in the selectivity by a factor of 2.5, and demonstrates good stability over a 2 month period. The enhanced sensing performance can be attributed to the modulation of the electronic arrangement of Pt by Cu, resulting in an augmentation of H2S adsorption. The Cu–Pt/CrN fuel cell gas sensor provides an opportunity for detecting parts per billion-level H2S in various applications.
研究领域:
材料科学
·
传感器技术
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环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Fenglong Sun,Qian Jing,Tongda Xing,Yue Li,Bolong Jiang,Yang Zhao,Huan Wang
In this study, a Ag/CCN composite photocatalyst with a dragon-fruit section structure synthesized by loading silver nanoparticles (Ag NPs) onto CCN (g-C3N4 modified by M-phenylenediamine), is successfully employed as the photoanode in the H2O2 fuel cell system. Through the optimization of Ag NP loading amount, the 5%-Ag/CCN composite-based fuel cell exhibits a maximum power density of 1.195 mW·cm–2 in an aqueous solution containing 0.1 M HCl under AM 1.5G illumination (1 sun, 100 mW·cm–2), which is about 2.4 times higher than that of the g-C3N4-based fuel cell. The solar-to-electricity conversion efficiency (SECE) of the above fuel cell is further calculated to be 0.886%. Additionally, the 5%-Ag/CCN-based photocatalytic H2O2 fuel cell shows high stability during the charge and discharge process and strong energy storage capacity, along with a specific capacitance of 6860 mF·cm–2 after 2 h of irradiation and a capacitance retention rate of 60.33% even after 6 h of continuous operation. The localized surface plasmon resonance (LSPR) effect of Ag NPs significantly enhances the light capture capability of the photoanode, and the Schottky junction formed at the interface between Ag NPs and CCN effectively suppresses the recombination of photogenerated electrons and holes, promoting the photocatalytic oxidation of H2O to generate H2O2. This study provides a feasible strategy for constructing an efficient photoanode to generate H2O2, further improving the energy conversion efficiency and stability of H2O2 fuel cells.
研究领域:
材料科学
·
能源科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 6
·1876-1886
·
IF 7
Junchao Han,Wuning Yuan,Menghui Wei,Bo Zhang,Yanhui Guo
Hydrolysis of borohydrides is a promising method for the hydrogen supply of high-energy-density fuel cells. Realization of on-demand hydrogen generation is critical and challenging for efficient utilization of hydrogen. Herein, we proposed a novel strategy to realize the real-time dynamic tunability of the hydrogen generation rate of the reaction for the first time. To realize this strategy, an applicable 3D catalyst is developed by depositing catalytic materials on readily available polymer foams through a simple electroless plating method, showing remarkable catalytic activity (12 560 mL min−1 gcatalyst−1, 10 470 mL min−1 goverall structure−1) and durability toward the hydrolysis of NaBH4. Due to its multiple advantages, valuable regulation of the H2 production rate was realized by simply adjusting the contact area of the magnetic catalyst with the NaBH4 solution using an external magnet. Moreover, the real-time tunability of the output power of the NaBH4-based fuel cell system without additional balance-of-plants was realized. This strategy may contribute to the improvement of the hydrolysis of borohydrides toward practical H2 generator applications, and could be extended to other liquid-phase hydrogen production systems.
研究领域:
材料科学
·
能源化学
·
催化反应
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ji Mi,Jingkai Ma,Hongshang Wang,Yongsheng Guo,Jiong Ding,Wenjun Fang
Endothermic hydrocarbon fuels are specialized fuels tailored for hypersonic aircraft to simultaneously achieve cooling and propulsion, yet their operational reliability is severely compromised by coking during high-temperature thermal cracking. Although the addition of ammonia to hydrocarbons has been shown great potential to enhance its anti-coking performance, practical applications remain constrained by system instability and scalability limitations. Herein, a new strategy to construct uniformly dispersed ammonia-water-in-hydrocarbon fuel systems is developed by encapsulating ammonia water within hydrocarbon-soluble nanospheres. These nanospheres self-assemble via energy-minimization principles during controlled mixing of ammonia, hydrocarbons, and surfactants (oleic acid and Tween). The resulting system exhibits enhanced heat sink and superior anti-coking performance, driven by synergistic mechanisms of ammonia and surfactants. Specifically, decomposition-derived radicals introducing oxygen/nitrogen defects into coke deposits to inhibit graphitization pathways and potentially deactivate resonance-stabilized radicals (coking precursors). This innovative approach provides a scalable platform for engineering stable, uniformly dispersed fuels tailored for hypersonic thermal management, while revealing mechanistic insights into the cooperative anti-coking effects of ammonia water nanospheres.
研究领域:
航空宇航科学与技术
·
材料科学
·
化学工程
·
纳米科技
·
燃烧科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2024
·
IF 9.9
Rui Wang,Xue Zhou,Mingsheng Hao,Qiang Xu,Rongji Xu,Yinshi Li
The direct liquid fuel cell utilizing hydrogen peroxide as an oxidant is considered to be the promising energy conversion technology, owing to its superior energy density and theoretical voltage. In the hydrogen peroxide-based fuel cells, the ever-changing two-phase mass transport and multi-component reaction processes resulting from the hydrogen peroxide self-decomposition exerts a pivotal influence on their performance. In this work, taken hydrogen peroxide self-decomposition into account, a cross-dimensional multi-physics model for the hydrogen peroxide-based fuel cell was proposed and developed to clarify the complex mechanisms of transports and reactions. In this ingeniously developed model, the multi-component reaction in the porous electrode is elucidated by a two-dimensional (2D) sub-model, the two-phase mass transport in the flow field is captured by a three-dimensional (3D) sub-model, and the one-dimensional (1D) correlation equation is served as a bridge between them. The uneven distribution of gas–liquid volume, velocity and current density and their relationships in fuel cell with serpentine flow field and dot matrix flow field were thus achieved. Furthermore, a novel gradient dot matrix flow field was developed to match the two-phase mass transport and multi-component reaction processes of hydrogen peroxide-based fuel cell. It is found that the continuously increasing pressure and velocity along flow path is balanced by the gradient-downsized ribs and the formation of large-volume oxygen bubbles is prevented by the gradient-densified ribs, achieving obviously uniformized current density distribution. Moreover, the gradient dot matrix flow field enables 54 % higher average hydrogen peroxide coverage contents (49 %) and 86 % lower average pressure drop (172 Pa) compared to the serpentine flow field, yielding 6.3 % higher peak power density (210 mW cm −2 ) and ultra-low extra pump power in fuel cell. This work will make contribution towards gaining profound insights into the intricate mechanisms underlying mass and charge transport, and offering invaluable guidance for the flow field design for the hydrogen peroxide-based fuel cells.
研究领域:
能源科学
·
化学工程
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Yingcong Wei,Qiqi Zhang,Ying Zhou,Xiongfeng Ma,Lele Wang,Yanjie Wang,Rongjian Sa,Jinlin Long,Xianzhi Fu,Rusheng Yuan
Simultaneous generation of H 2 fuel and value-added chemicals has attracted increasing attention since the photogenerated electrons and holes can be both employed to convert solar light into chemical energy. Herein, for realizing UV-visible-NIR light driven dehydrogenation of benzyl alcohol (BA) into benzaldehydes (BAD) and H 2 , a novel localized surface plasmon resonance (LSPR) enhanced S-scheme heterojunction was designed by combining noble-metal-free plasmon MoO 3– x as oxidation semiconductor and Zn 0.1 Cd 0.9 S as reduction semiconductor. The photoredox system of Zn 0.1 Cd 0.9 S/MoO 3– x displayed an unconventional reaction model, in which the BA served as both electron donor and acceptor. The S-scheme charge transfer mechanism induced by the formed internal electric field enhanced the redox ability of charge carriers thermodynamically and boosted charge separation kinetically. Moreover, due to the LSPR effect of MoO 3− x nanosheets , Zn 0.1 Cd 0.9 S/MoO 3− x photocatalysts exhibited strong absorption in the region of full solar spectrum. Therefore, the Zn 0.1 Cd 0.9 S/MoO 3− x composite generated H 2 and BAD simultaneously via selective oxidation of BA with high production (34.38 and 33.83 mmol·g −1 for H 2 and BAD, respectively) upon full solar illumination. Even under NIR light irradiation, the H 2 production rate could up to 94.5 mmol·g −1 ·h −1 . In addition, the Zn 0.1 Cd 0.9 S/MoO 3– x composite displayed effective photocatalytic H 2 evolution rate up to 149.2 mmol·g −1 ·h −1 from water, which was approximate 6 times that of pure Zn 0.1 Cd 0.9 S. This work provides a reference for rational design of plasmonic S-scheme heterojunction photocatalysts for coproduction of high-value chemicals and solar fuel production.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Liang Guo,Yimo Zhu,Degang Li,Wanchen Sun,Yanbin Shi,Changcheng Liu,Hao Zhang,Xia Liu,Jiahui Han,Yanan Guo,Fei Yue
In this paper, the basic combustion characteristics of blends of ammonia and several typical hydrocarbon fuels (including n-heptane, gasoline and RP-3 kerosene) are explored. The results show that the Laminar Flame Speed (LFS) of ammonia combustion assisted by n-heptane is faster than that of the ammonia combustion assisted by gasoline. The equivalent ratio of RP-3 kerosene/ammonia co-combustion corresponding to the highest LFS is evidently higher than other two fuels, and its equivalent ratio of lean burn limit is also higher. Further analysis of chemical reaction kinetics reveals that carbon-based fuels and ammonia interact with each other primarily via the competition to obtain active free radicals, such as OH, H, and O. Besides, the strength of C-N cross-reaction is relatively low and has little influence on the overall reaction path. Comparing the three co-combustion processes, the Markstein length of RP-3 kerosene-assisted ammonia combustion is higher, which is conducive to improving the stability of flame, especially under the high equivalent ratio. With the variation of temperature, the Markstein length of the n-heptane assisted ammonia combustion changes most significantly, and the addition of iso-alkanes will weaken the sensitivity of Markstein length to temperature.
研究领域:
燃烧科学
·
化学动力学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Aowen Huang,Chen Dong,Yiren Gao,Lu Liu,Xiaoshan Yan,Panchao Yin
The perfluorosulfonic acid (PFSA) polymers have achieved great success as proton exchange membranes (PEMs) in various energy storage and conversion devices; nevertheless, the improvements regarding PEMs' synthetic cost, mechanical properties, stability and processability are still urgently required. Herein, 1 nm super acidic metal oxide cluster, H 3 PW 12 O 40 (PW 12 ), is complexed with the blends of polyvinylpyrrolidone (PVP) and polyvinylidene fluoride (PVDF) to afford nanocomposite PEMs that enables the stable and effective operation of hydrogen fuel cell devices. As the polymer matrix , the PVDF is blended with PVP via inter-chain hydrogen bonding to provide mechanical support for the nanocomposite PEMs. The further introduced PW 12 clusters can interact strongly with PVP via electrostatic attraction to enhance the PEMs' mechanical strength (E = 231 MPa) and prevent the leaching of PW 12 for long-term stability. Meanwhile, the incorporation of the super acidic PW 12 can facilitate the fast proton transportation and therefore, lead to the significant increasement of proton conductivity to 9.8 × 10 −3 S cm −1 at 70 °C and 100% RH. Due to the excellent mechanical properties and the supramolecular interaction among the components, the PEMs’ thickness can be controlled to be challenging ∼10μm for feasible large-scale continuous processing. Finally, the molecular design enables the successful fabrication of the nanocomposite PEMs into fuel cell devices with the power density as 342.8 mW cm −2 . The studies not only shed light on the structure-properties of polymer nanocomposites , but also pave avenues to the design of robust composite PEMs for fuel cell appliacations.
研究领域:
材料科学
·
能源工程
✓ 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）