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Performance assessment of an integrated PEFC
and an hydrogen storage device based on
innovative material.
綜合PEFC和儲氫裝置在創新材料基礎上的
性能評估
STUDENT'S NAME：黃舜韋
STUDENT'S ID：MA410113
PROFESSOR：張崴縉
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Contents 目錄
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Introduction
Experimental-Synthesis of the material
Experimental-Design of the tank
Experimental-Design and control of the measurement system
Results and discussion
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Introduction
• hydrogen can be stored mainly in three different
approaches:
1. Storage in a pressurized steel or lightweight composite
tanks at high pressure (350-700 bar).
2. Storage as a liquid in insulated tanks at cryogenic
temperature (77 k).
3. Storage onto solid matrices able to adsorb/desorb
hydrogen through chemical or physical sorption at given
temperature and pressure conditions.
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Introduction
• The last one is the most investigated method due to both the
simplicity of the energetic system and the economic
advantages.
• Other classes of materials have the advantages of lightweight,
low sensitivity to air and hydrogen storage capacity
comparable to metal hydrides but,on the contrary, the storage
capacity is activated in drastic conditions of temperature and
pressure.
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Experimental-Synthesis of the
material
• A highly chlorosulphonated PEEK, obtained through an
electrophilic aromatic substitution reaction ,was used as
polymeric matrix.
• The precursor PEEK (450PF Victrex) was treated with
chlorosulphonic acid at 30 C under stirring for 24 h and the
resulting polymer had a sulphonation degree around 100%.
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Experimental-Synthesis of the
material
• Following this procedure, a scale-up of the composite material
synthesis (from 2 to 20 g) was carried out and a good
reproducibility was confirmed by XRD analysis (Fig. 1).
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Fig. 1 e XRD batch profiles.
Experimental-Design of the tank
• The design was performed using the Solid Edge software (Fig.
2).
Fig. 2 e Prototype tank design.
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Experimental-Design of the tank
• The prototype tank before and after the loading of the
material is shown in Fig. 3.
Fig. 3 e Prototype tank.
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Experimental-Design of the tank
• For the design, the thermal insulation of the cylinder was
made using a polymeric material having high temperature
resistance.
• The cylinder and thermoresistance assembly was thermally
insulated from the outside using two layers of insulation, the
inner in ceramic sheath (for high T) while the outer one in
polymeric foam (Polyflex AT, temperature limits-40 to 150 ℃)
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Experimental-Design and control of
the measurement system
• The measurement system was realized by interfacing a fuel
cell test station and a NI Compact RIO controller connected it
to a PC.
• The monitored signals were:
1. The output gas pressure of the tank by means of a pressure
transducer.
2. The output gas flow rate of the tank and the input gas into
the cell, controlled by the fuel cell test station.
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Results and discussion
• Two types of test were performed to measure the
performance of the small tank.
• The first test includes the measurement of the quantity of gas
released by the tank filled with the synthesized material.
• This parameter was recorded through a mass flow controller
(MKS Mass-FLO model).
• The monitored (and recorded) quantities are tank pressure
and gas mass flow vs. time.
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Results and discussion
• In Fig.4 (a), a comparison between the baseline fuel cell
performance (blue (in the web version) line) and the
electrochemical test at 80 C1.5 bar at 0.6V(green plot) is
reported.
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Fig.4,Comparison of fuel cell performance at fixed potential (a)
Results and discussion
• The blue line represents the performance of PEFC under
standard testing conditions while the green line represents
the performance of the actual system.
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Fig.4,Comparison of fuel cell performance at fixed potential (a)
Results and discussion
• Explained by Faraday‘s Law: under galvanostatic condition the
gas consumption rate is constant, hence the mass flow
controller follows the set point just like fig.4(b).
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Fig.4, current (b) by using standard and prototype H2 feeding.
Results and discussion
• Instead, under potentiostatic condition the mass flow
controller must manage the flow according to any current
fluctuation, leading to a flow instability.
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Fig.4, current (b) by using standard and prototype H2 feeding.
Results and discussion
• This is explained by Faraday's Law: under galvanostatic
condition the gas consumption rate is constant, hence the
mass flow controller follows the set point.
• Under the most appropriate testing conditions, fuel cell
performance were comparable (Fig. 7b) to that of the
standard test, showing that the innovative material used for
hydrogen storage can be used for practical applications,
although still many aspects need to be enhanced such as
material storage capacity and system design.
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Thank you for your attention
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