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.

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.

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.

Hydrogen generation from hydrolysis of sodium borohydride using Ni–Ru nanocomposite as catalysts

2009 ◽  
Vol 34 (5) ◽  
pp. 2153-2163 ◽  
Author(s):  
Cheng-Hong Liu ◽  
Bing-Hung Chen ◽  
Chan-Li Hsueh ◽  
Jie-Ren Ku ◽  
Ming-Shan Jeng ◽  
...  
Keyword(s):  
Sodium Borohydride ◽  
Hydrogen Generation ◽  
Hydrolysis Of

High-Purity, CO2-Free Hydrogen Generation from Crude Oils in Crushed Rocks Using Microwave Heating

2021 ◽  
Author(s):  
Qingwang Yuan ◽  
Xiangyu Jie ◽  
Bo Ren
Keyword(s):  
Microwave Heating ◽  
Environmental Impacts ◽  
High Purity ◽  
Oil And Gas ◽  
Hydrogen Generation ◽  
Petroleum Industry ◽  
Petroleum Reservoirs ◽  
Crude Oils ◽  
Hydrogen Yield ◽  
Free Hydrogen

Abstract While the demand for hydrocarbon resources has been continuously increasing in the past 150 years, the industry is, however, criticized for carbon dioxide (CO2) emissions and concomitant global warming concerns. The oil and gas industry also face growing pressures in the ongoing energy transition. Generating and producing hydrogen (H2) directly from petroleum reservoirs has the potential to mitigate environmental impacts while revolutionizing the traditional petroleum industry and enabling it to become a clean hydrogen industry. This paper proposes a novel approach to generate high-purity, CO2-free hydrogen from the abundant oil and gas resources in petroleum reservoirs using microwave heating. In this work, laboratory experiments were conducted to validate this scientific proof-of-concept and examine the roles of crushed rocks, catalysts, and water/oil ratio in hydrogen generation from crude oils in a reactor. A maximum of 63% ultimate hydrogen content is obtained in the generated gas mixtures, while the original CO2content in all experiments is negligible (<1%). Catalysts can promote hydrogen generation by accelerating rate and locally enhancing microwave (MW) absorption to create ‘super-hot spots'. Water also participates in reactions, and additional hydrogen is generated through water-gas shift reactions. The water-oil ratio in porous rocks affects the ultimate hydrogen yield. Overall, this research demonstrates the great potential of using MW heating to generate high-purity, CO2-free hydrogen from in situ petroleum reservoirs. Further research and wide application of this technology would potentially transform petroleum reservoirs to hydrogen generators, thus mitigating the environmental impacts of traditional petroleum industry while meeting the increasing demand for clean hydrogen energy. This technology would also benefit the safe transition towards a decarbonized society.

Novel high dispersion and high stability cobalt-inlaid carbon sphere catalyst for hydrogen generation from the hydrolysis of sodium borohydride

Fuel ◽  
2022 ◽  
Vol 310 ◽  
pp. 122276
Author(s):  
Lei Sun ◽  
Yuanyuan Meng ◽  
Xinxin Kong ◽  
Huiyun Ge ◽  
Xingman Chen ◽  
...  
Keyword(s):  
Sodium Borohydride ◽  
High Stability ◽  
Hydrogen Generation ◽  
High Dispersion ◽  
Carbon Sphere ◽  
Hydrolysis Of

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.

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