Hydrogen generation from hydrolysis of activated aluminum/organic fluoride/bismuth composites with high hydrogen generation rate and good aging resistance in air

Energy ◽  
2019 ◽  
Vol 170 ◽  
pp. 159-169 ◽  
Author(s):  
Fei Xiao ◽  
Rongjie Yang ◽  
Jianmin Li
Keyword(s):  
Hydrogen Generation ◽  
Generation Rate ◽  
High Hydrogen ◽  
Aging Resistance ◽  
Hydrolysis Of

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.

Hydrogen Generation by Hydrolysis of the Ball Milled Al-C-KCl Composite Powder in Distilled Water

2012 ◽  
Vol 519 ◽  
pp. 87-91 ◽  
Author(s):  
Xia Ni Huang ◽  
Zhang Han Wu ◽  
Ke Cao ◽  
Wen Zeng ◽  
Chun Ju Lv ◽  
...  
Keyword(s):  
Particle Size ◽  
Reaction Temperature ◽  
Fine Particle ◽  
Composite Powder ◽  
Hydrogen Generation ◽  
Aluminum Particle ◽  
Generation Rate ◽  
Composite Powders ◽  
Fine Particle Size ◽  
Hydrolysis Of

In the present investigation, the Al-C-KCl composite powders were prepared by a ball milling processing in an attempt to improve the hydrogen evolution capacity of aluminum in water. The results showed that the hydrogen generation reaction is affected by KCl amount, preparation processing, initial aluminum particle size and reaction temperature. Increasing KCl amount led to an increased hydrogen generation volume. The use of aluminum powder with a fine particle size could promote the aluminum hydrolysis reaction and get an increased hydrogen generation rate. The reaction temperature played an important role in hydrogen generation rate and the maximum hydrogen generation rate of 44.8 cm3 min-1g-1of Al was obtained at 75oC. The XRD results identified that the hydrolysis byproducts are bayerite (Al(OH)3) and boehmite (AlOOH).

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.

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.

Microwave-Assisted Synthesis of Ni/CNTs Nanocomposites for Hydrogen Production from Hydrolysis of NaBH4

2012 ◽  
Vol 622-623 ◽  
pp. 816-820
Author(s):  
Fang Li ◽  
Qi Ming Li ◽  
Hern Kim
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Production ◽  
Hydrogen Generation ◽  
Generation Rate ◽  
Ni Catalyst ◽  
Microwave Assisted Synthesis ◽  
Environment Friendly ◽  
Microwave Assisted ◽  
Hydrolysis Of ◽  
Supported Ni

Hydrogen production from NaBH4 hydrolysis is very important for environment-friendly fuel cells. Here Ni/CNTs nanocomposites were prepared by microwave-assisted method and used as the catalyst for catalytic hydrolysis of NaBH4. XRD and SEM characterization showed that uniform Ni/CNTs nanocomposites can be obtained through microwave heating and solvent optimization. Ni/CNTs nanocomposites exhibit excellent catalytic activity in the hydrolysis of NaBH4, i.e., the average hydrogen generation rate at 25°C is 840ml.min-1.g-1 for the CNTs-supported Ni/CNTs, while the hydrogen generation rate of 86ml.min-1.g-1 for unsupported Ni catalyst. Compared with the unsupported Ni catalyst, Ni/CNTs nanocomposites presented higher catalytic activity for hydrolysis of aqueous NaBH4 solution.

Investigation into the Catalytic Ability of Fibrillar Co-Y-B Catalyst in Hydrogen Production from Hydrolysis of Sodium Borohydride

2013 ◽  
Vol 724-725 ◽  
pp. 773-777
Author(s):  
Jing Chang ◽  
Fang Lin Du
Keyword(s):  
Sodium Borohydride ◽  
Hydrogen Generation ◽  
Chemical Reduction ◽  
Xrd Analysis ◽  
Generation Rate ◽  
Pure Hydrogen ◽  
Generation Process ◽  
Catalytic Reactivity ◽  
Hydrolysis Of ◽  
Structural Characterizations

The hydrolysis reaction of sodium borohydride (NaBH4) can generate highly pure hydrogen. In this paper, the Co-Y-B catalyst is prepared using the simple chemical reduction method. Its catalytic reactivity is investigated for different NaBH4 concentrations, NaOH concentrations, the catalyst amounts and the reacting temperatures. When the Y/(Co+Y) mole ratio in catalyst arrives at 40 %, the catalysts show the best catalytic ability. There is an optimum range, around 8 wt.% for NaBH4 concentration and also 8 wt.% for NaOH concentration, respectively, in which the hydrogen generation rate performed best. Both the large catalyst amount and the high reacting temperature are beneficial to promote the hydrogen generation rate. Structural characterizations of the fibrillar catalysts are carried out in SEM and XRD analysis. The value of activation energy for the hydrogen generation process is calculated to be 48.02 kJ/mol and it compares favorably with some other previously reported values.

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 Effects of Composite Catalyst Co2B/TiO2 on Hydrolysis of NaBH4

2015 ◽  
Vol 9 (1) ◽  
pp. 60-63
Author(s):  
Yong Li ◽  
Yuxin Zhang ◽  
Yuxi Gu ◽  
Yufei Cai ◽  
Ruizhu Zhang ◽  
...  
Keyword(s):  
Hydrogen Generation ◽  
Hydrogen Release ◽  
Generation Rate ◽  
Composite Catalyst ◽  
Percentage Composition ◽  
Release Capacity ◽  
Hydrolysis Of ◽  
Hydrolysis Of Nabh4

For the purpose of improving hydrogen release capacity of NaBH4, hydrogen generation performance of NaBH was catalyzed by Co2B and TiO2 compound with different mole ratio and percentage composition are investigated. The experiment mainly concentrated in the hydrogen generation rate and the hydrogen generation volume. The results indicate that the effects of hydrogen release of NaBH when the proportions and amount of Co2B/TiO2 are not obvious. Changing the proportions and the amount, the amount of hydrogen release by hydrolysis of NaBH4 are between 343- 375ml. However, the study on the rate of hydrogen release finds that the effects of the proportion and amount of the compound catalyst on the rate of hydrogen release are very marked. The rate of hydrogen release of the catalyst samples presents an obvious increase when the amount of Co2B/TiO2 is between 1-4%. Among all the samples of compound catalyst, the rate of hydrogen release of the sample with 5% Co2B/2TiO2 is the largest.

Investigation into Hydrogen Production in Hydrolysis of Sodium Borohydride in the Presence of Co-La-B Catalyst

2013 ◽  
Vol 724-725 ◽  
pp. 735-739
Author(s):  
Jing Chang ◽  
Fang Lin Du
Keyword(s):  
Sodium Borohydride ◽  
Hydrogen Generation ◽  
Chemical Reduction ◽  
Generation Rate ◽  
Pure Hydrogen ◽  
Generation Process ◽  
Simple Chemical ◽  
Catalytic Reactivity ◽  
Hydrolysis Of ◽  
Structural Characterizations

The hydrolysis reaction of sodium borohydride (NaBH4) can generate highly pure hydrogen. In this paper, the Co-La-B catalyst is prepared using the simple chemical reduction method. Its catalytic reactivity is studied for different NaBH4 concentrations, NaOH concentrations, the catalyst amounts and the reacting temperatures. For both NaBH4 concentration and NaOH concentration, the hydrogen generation rate climbs to the peak when they stay around 8 wt.%. The hydrogen generation rate can also be promoted by increasing the catalyst amount and raising the reacting temperature. Structural characterizations of the catalysts are performed from SEM and XRD photos. The value of activation energy for the hydrogen generation process is calculated to be 42.33 kJ/mol and it compares favorably with some other previously reported values.

Sign in / Sign up

Export Citation Format

Share Document