Accelerated Hydrolysis of Solid-state NaBH4/Al System by Co2B Milled with Li for Hydrogen Generation

2016 ◽  
Vol 19 (2) ◽  
pp. 109-115
Author(s):  
Jiasong Chang ◽  
Wenlong Song ◽  
Ting Li ◽  
Jindan Chen ◽  
Hanmei Wu ◽  
...  
Keyword(s):  
Milling Time ◽  
Hydrogen Generation ◽  
Synergetic Effect ◽  
Hydrogen Yield ◽  
Preparation Process ◽  
Preparation Technology ◽  
High Hydrogen ◽  
Hydrolysis Process ◽  
Hydrolysis Of ◽  
Li Content

Co2B catalyst was milled with Al and Li to form Al-Li-Co2B composite, and the hydrogen generation performance of Al-Li-Co2B/NaBH4 system was investigated in this study. 100% hydrogen yield was reached, and high hydrogen generation rate was regulated by optimizing the composition design and preparation technology. The improvement was attributed to the synergetic effect of Co2B and Li in the preparation process, whereas a large specific surface area was obtained with the increase in Li content, Co2B, and milling time. In addition, the catalytic activity of Co2B and LiOH from Li hydrolysis was heightened for the hydrolysis of the Al/NaBH4 system because of the addition of Al(OH)3, LiAl2(OH)7.xH2O, and NaBO2 in the hydrolysis process.

Microstructure Analysis and Hydrolysis Mechanism of AlLi Alloys Activated by Metal Additives for Hydrogen Generation

2011 ◽  
Vol 14 (4) ◽  
pp. 259-264
Author(s):  
Mei-Qiang Fan ◽  
Shu Liu ◽  
Wen-Qiang Sun ◽  
Da Chen ◽  
Chun-Ju Lv ◽  
...  
Keyword(s):  
Milling Time ◽  
Hydrogen Generation ◽  
Electrochemical Corrosion ◽  
Double Effect ◽  
Microstructure Analysis ◽  
Standard Potential ◽  
Preparation Technology ◽  
Hydrolysis Process ◽  
Metal Additives ◽  
Hydrolytic Mechanism

Microstructure analysis and hydrolytic mechanism of activated Al-Li alloys including low melting point metal additives X (X:indicated as Bi, Sn, In and Ga) are explained for their good hydrogen generation performance in this paper. It is demonstrated that the presence of these metals has a double effect. The metals are helpful to reduce the grain size of Al-Li alloys due to the formation of new intermetallic compounds such as BiLi3, Sn5Li13, AlLiIn2, etc., preventing the connection of Al-Al and Li-Li atoms. The metals strongly improved hydrogen generation performance because the metals deposited on the surface of Al and Li metals act as cathodic centers for hydrogen generation. There were dual micro galvantic cells between Al (Li) and metal additives created in the hydrolysis process which stimulated the electrochemical corrosion of Al and Li. The LiX alloy acts as the initial hydrolysis centers due to its low standard potential and its hydrolysis byproduct LiOH further accelerates the micro galvantic cell between Al and X. Therefore, hydrogen generation performance is linked to standard potential of metal additives, increased Li and X amounts, uniform distribution of Li and X in the Al matrix in the longer milling time. Our results show that the potential good hydrogen generation performance can be obtained via the design and preparation technology of Al alloys.

Combined Hydrogen Generation from Al/NiCl2 Powder and Alkaline NaBH4 Solution for Portable Fuel Cell

2012 ◽  
Vol 16 (1) ◽  
pp. 9-12
Author(s):  
Yan Ling An ◽  
Chao Li ◽  
Bin Hong Tang ◽  
Xia Xiao ◽  
Tian Zhe Zhang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Catalytic Effect ◽  
Hydrogen Generation ◽  
Generation Rate ◽  
Hydrogen Yield ◽  
High Hydrogen ◽  
Composition Design ◽  
Naoh Solution ◽  
Al Powder ◽  
Hydrolysis Of

Hydrolysis of Al and NaBH4 for hydrogen generation has obtained considerable attention as a portable hydrogen source system. In this paper, we report a new combined hydrogen generation from Al powder and alkaline NaBH4 solution activated by NiCl2 additive. The system is characterized as the followed features: the interaction of Al/NaBH4 hydrolysis, catalytic effect of Ni2B for Al and NaBH4, Al hydrolysis stimulated by NaOH solution. The effects which affect the hydrogen generation performance of the system were studied. The results showed that a favorable combination of high hydrogen yield and high hydrogen generation rate might be obtained via the optimized composition design. Therefore, the system may be developed as a portable hydrogen source system.

Improved Commercialized Lithium Titanate Performance in Lithium-ion Batteries by Annealing

2012 ◽  
Vol 16 (1) ◽  
pp. 19-23
Author(s):  
Xinxi Li ◽  
Guoqing Zhang ◽  
Zhongqiong Xiong ◽  
Junqiao Xiong ◽  
Yongping Qiu
Keyword(s):  
Lithium Ion Batteries ◽  
Catalytic Effect ◽  
Hydrogen Generation ◽  
Lithium Ion ◽  
Lithium Titanate ◽  
Hydrogen Yield ◽  
High Hydrogen ◽  
Naoh Solution ◽  
Al Powder ◽  
Hydrolysis Of

Hydrolysis of Al and NaBH4 for hydrogen generation has obtained considerable attention as a portable hydrogen source system. In this paper, we report a new combined hydrogen generation from Al powder and alkaline NaBH4 solution activated by NiCl2 additive. The system is characterized as the followed features: the interaction of Al/NaBH4 hydrolysis, catalytic effect of Ni2B for Al and NaBH4, Al hydrolysis stimulated by NaOH solution. The effects which affect the hydrogen generation performance of the system were studied. The results showed that a favorable combination of high hydrogen yield and high hydrogen generation rate might be obtained via the optimized composition design. Therefore, the system may be developed as a portable hydrogen source system.

Combination of Chemical Hydride Hydrogen Generation System with Low-Temperature PEMFCs

2012 ◽  
Vol 253-255 ◽  
pp. 751-759
Author(s):  
Ay Su ◽  
Hsiu Lu Chiang ◽  
Zhen Ming Huang
Keyword(s):  
Sodium Borohydride ◽  
High Purity ◽  
Production Efficiency ◽  
Hydrogen Generation ◽  
Flow Reactor ◽  
Integrated System ◽  
Hydrogen Yield ◽  
High Hydrogen ◽  
Fuel Feed ◽  
Hydrolysis Of

High purity hydrogen generated by hydrolysis of sodium borohydride can be used as the fuel of PEM fuel cell and other portable device. As its high hydrogen storage capacity, controllable reaction and mild condition, hydrogen generation by catalytic hydrolysis of chemical hydride, such as sodium borohydride, has been the major focus of researches. On the threshold of the controllable of hydrogen generated by hydrolysis of sodium borohydride, the catalyst for hydrolysis of hydrogen generation (HG) is studied. First, applying chemical plating, Ru/Ni foam catalyst was prepared; then, continuous flow reactor method was used to generate hydrogen. Varied parameters, such as concentrations of NaBH4 and NaOH, flow rate of NaBH4 solution and quantity of catalyst, were inspected in this research. It was found that, the NaBH4 and NaOH concentration at 20wt% and 3wt%, fuel feed to 4 g/min, hydrogen yield of 1.72 L/min, the hydrogen production efficiency as high as 91.2%. The present hydrogen generator was integrated with a 100W PEMFC and the optimum performance of the integrated system was studied. The hydrogen produced from NaBH4 has high purity and humidity; therefore, it can be directly used as the fuel for PEMFCs, which in general require humidified hydrogen. It is found that for cell voltage above 0.6V, the performance of cell using NaBH4 hydrogen is 103.45W, versus 99.9W with cylinder hydrogen.

scholarly journals Research on hydrogen generation from rapid hydrolysis of aluminum in sodium fluoride solution

2019 ◽  
Vol 118 ◽  
pp. 03048
Author(s):  
Changchun Li ◽  
Yuxin Wu
Keyword(s):  
Hydrogen Production ◽  
Kinetic Model ◽  
Sodium Fluoride ◽  
Hydrogen Generation ◽  
Hydrogen Yield ◽  
Shrinking Core Model ◽  
Fluoride Solution ◽  
Shrinking Core ◽  
Rapid Hydrolysis ◽  
Hydrolysis Of

Hydrogen generation from rapid hydrolysis of aluminum in sodium fluoride solution was investigated through a hydrolysis experiment. Rapid and instant hydrogen yield were observed using sodium fluoride as additive. The experimental results demonstrate that the increase of temperature and the amount of additives in a certain range will boost the hydrogen production. The amount of additives outside the range only has an effect on the rapid hydrolysis of the aluminum during the initial stage, but the total amount of hydrogen produced doesn’t increased significantly. Theoretical analysis of the effects of the mixing ratio and the temperature on the hydrogen production rates were performed using the shrinking core model and the kinetic model. The shrinking core model parameter a and k indicate the film change degree of porosity and thickness and the effect of time on the diffusion coefficient. the kinetic model is verified and the activation energy confirming hydrogen yield control by a molecular diffusion process. Correspondingly, mechanisms of Al corrosion in NaF solutions under low and high alkalinity were proposed, respectively.

Study on Hydrogen Generation from Al−Li/NaBH4 Mixture in Pure Water for Portable Fuel Cell

2011 ◽  
Vol 239-242 ◽  
pp. 1058-1061
Author(s):  
Shu Liu ◽  
Han Bo Bao ◽  
Mei Fan ◽  
Da Chen ◽  
Kang Ying Shu
Keyword(s):  
Fuel Cell ◽  
Solid State ◽  
Catalytic Effect ◽  
Hydrogen Generation ◽  
Pure Water ◽  
Milling Process ◽  
Hydrogen Yield ◽  
Hydrolysis Process ◽  
Uniform Dispersion ◽  
Catalytic Sites

Solid-state Al−Li/NaBH4mixtures with salts have been fabricated for hydrogen evolution through a milling process, providing uniform dispersion of metals Al, Li and salts among pulverized NaBH4particles, in order to increase the contacts of NaBH4 with active catalytic sites. The results show that the mixture has good hydrolysis properties, especially that Al−Li−CoCl2/NaBH4mixture has hydrogen yield of 1482 mL g-1in 40−minute hydrolysis in pure water, with 100% conversion efficiency. The catalytic effect comes from Al(OH)3and Ni2B or Co2B, which were fabricated in the hydrolysis process.

scholarly journals Enhanced Hydrolysis Performance of Al-Li-Ni3Sn2 Composites for Hydrogen Generation and Relative Mechanism

2015 ◽  
Vol 18 (3) ◽  
pp. 149-153
Author(s):  
Wei Xia ◽  
Zhujian Li ◽  
Haifei Long ◽  
Jindan Chen ◽  
Ting Li ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Performance Improvement ◽  
Active Sites ◽  
Hydrogen Generation ◽  
Electrochemical Activity ◽  
Hydrogen Yield ◽  
Nano Structure ◽  
Hydrolysis Process ◽  
Ni Alloy ◽  
Milling Method

The Al-Li-Ni3Sn2 composites were prepared via milling method and their hydrolysis performance was presented in the paper. The milled Al-Li-Ni3Sn2 composites showed high hydrolysis performance at 30-600C, especially that Al-3.5wt%Li-20wt%Ni3Sn2 composite had 100% and 1103 ml hydrogen/g of hydrogen yield within 20 min at 500C.The hydrolysis performance improvement of Al-Li-Ni3Sn2 composite was due to the addition of Ni3Sn2 while Ni3Sn2 combined with Al and formed nano structure of Ni-based alloys deposited on the surface of Al. The structure of Al-(Ni alloy) could act as active sites in the hydrolysis process because the milled products such as AlNi, Al-NiSn and Al- Ni3Sn2 had high electrochemical activity in the hydrolysis process. Therefore, Al-Li-Ni3Sn2 composites were a potential hydrogen source for fuel cell.

A Potential Hydrogen Sources from Milled Silicon Powder Activated by Lithium, and Aluminum Chloride

2017 ◽  
Vol 20 (3) ◽  
pp. 123-127
Author(s):  
Tianchu Yin ◽  
Hongwei ShenTu ◽  
Chengqiao Xi ◽  
Xin Chen ◽  
Wenzhen Zou ◽  
...  
Keyword(s):  
Particle Size ◽  
Aluminum Chloride ◽  
Hydrogen Generation ◽  
Silicon Powder ◽  
Hydrolysis Rate ◽  
Hydrogen Yield ◽  
Silicon Matrix ◽  
Pure Silicon ◽  
Hydrolysis Of ◽  
Silicon Activity

A potential hydrogen source generated from milled Li-Si-AlCl3 composite was evaluated in this paper. The composite exhibits good hydrogen generation performance in water at 313–343 K, whereas pure silicon powder cannot continuously react with water under similar conditions. The hydrogen yield reaches 1300 mL hydrogen/g within 20 min, and the highest hydrogen generation rate is higher than 1200 mL hydrogen/g min within the first minute of hydrolysis. The hydrogen generation performance increases with increasing concentrations of lithium and aluminum chloride. Microstructure analysis indicates that silicon activity increases due to decreased particle size and distribution of lithium and aluminum chloride into silicon matrix during milling. The hydrolysis of the additives generates heat and alkaline hydrolysis byproducts, thereby stimulating the hydrolysis rate of silicon in the micro area. Therefore, the hydrolysis of silicon in water may act as a potential hydrogen source for portable micro fuel cells.

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