DOE Technical Targets for Hydrogen Storage Systems for Portable Power Equipment

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These tables summarize hydrogen storage technical performance targets for portable power applications. These targets were developed with input to DOE through extensive communications with various stakeholders, industry developers, and end users, including through a 2012 request for information and workshops, as well as additional national lab assessments.

More information about targets can be found in the Hydrogen Storage section of the Fuel Cell Technologies Office's Multi-Year Research, Development, and Demonstration Plan.

Technical Performance Targetsa: Hydrogen Storage Systems for Low Power (≤2.5 W) Portable Equipment

Storage Parameter Units 2015 2020
  Single-Use Rechargeable Single-Use Rechargeable
Hydrogen Capacity
Hydrogen capacity g H2 ≤1 ≤1 ≤1 ≤1
System Gravimetric Capacityb
Usable, specific-energy from H2 (net useful energy/max system mass)c kWh/kg
(kg H2/kg system)
0.7
(0.02)
0.5
(0.015)
1.3
(0.04)
1.0
(0.03)
System Volumetric Capacity
Usable energy density from H2 (net useful energy/max system volume)c kWh/L
(kg H2/L system)
1.0
(0.03)
0.7
(0.02)
1.7
(0.05)
1.3
(0.04)
Storage System Cost
System cost $/Wh net
($/g H2 stored)
0.09
(3.0)
0.75
(25)
0.03
(1.0)
0.4
(13)

 

Technical Performance Targetsa: Hydrogen Storage Systems for Medium Power (>2.5 W–150 W) Portable Equipment

Storage Parameter Units 2015 2020
  Single-Use Rechargeable Single-Use Rechargeable
Hydrogen Capacity
Hydrogen capacity g H2 >1–50 >1–50 >1–50 >1–50
System Gravimetric Capacityb
Usable, specific-energy from H2 (net useful energy/max system mass)c kWh/kg
(kg H2/kg system)
0.7
(0.02)
0.5
(0.015)
1.3
(0.04)
1.0
(0.03)
System Volumetric Capacity
Usable energy density from H2 (net useful energy/max system volume)c kWh/L
(kg H2/L system)
1.0
(0.03)
0.7
(0.02)
1.7
(0.05)
1.3
(0.04)
Storage System Cost
System cost $/Wh net
($/g H2 stored)
0.2
(6.7)
1.0
(33)
0.1
(3.3)
0.5
(17)

 

Portable Power Durability and Operational Targetsa

Storage Parameter Units 2015 2020
  Single-Use and Rechargeable Single-Use and Rechargeable
Durability/Operability
External operating temperature ranged ºC -40/60 -40/60
Min/max delivery temperaturee ºC 10/85 10/85
Min delivery pressure from storage system bar (abs) 1.5 1.5
Max delivery pressure from storage system bar (abs) 3 3
External temperaturef ºC ≤40 ≤40
Discharging Rates
Minimum full flow rate (g/s)/kW 0.02 0.02
Start time to full flow (20ºC) s 5 5
Start time to full flow (-20ºC) s 10 10
Transient response 10%–90% and 90%–0% s 5 2
Fuel Purity
Fuel purity (H2 from storage)g % H2 Meets applicable standards
Environmental Health and Safety
Toxicity   Meets ISO-16111:2008; IEC 62282 Part 6; or other applicable standards
as appropriate or required for the application and targeted usage
Safety
Loss of usable H2h

a The targets are based on the lower heating value of hydrogen, without consideration of the conversion efficiency of the fuel cell power plant. Targets are for the complete hydrogen storage and delivery system, including tank, material, valves, regulators, piping, mounting brackets, insulation, added cooling or heating capacity, and/or other balance-of-plant components. All capacities are defined as usable capacities that could be delivered to the fuel cell power plant during normal use. All targets must be met at the end of service life.

b Generally the 'full' mass (including hydrogen) is used; for systems that gain weight on hydrogen release, the highest mass during discharge is used (e.g., hydrogen release through hydrolysis reaction resulting in the formation of oxides/hydroxides). All capacities are net usable capacity able to be delivered to the fuel cell power plant. Capacities must be met at end of service life.

c "Net useful energy" or "net" excludes unusable energy (i.e., hydrogen left in a tank below minimum fuel cell power plant pressure, flow, and temperature requirements) and hydrogen-derived energy used to extract the hydrogen from the storage medium (e.g., fuel used to heat a material to initiate or sustain hydrogen release).

d Stated ambient temperature plus full solar load (i.e., if exposed to direct sunlight or stored within a container exposed to direct sunlight for extended periods of time). No allowable performance degradation from –20°C to 40°C. Allowable degradation outside these limits is to be determined.

e Delivery temperature refers to the inlet temperature of the hydrogen to the fuel cell.

f The external device temperature is the maximum temperature generated at the external surface of the hydrogen storage container during operation.

g Hydrogen storage systems must be able to deliver hydrogen meeting acceptable hydrogen quality standards, such as ISO-16111:2008 and IEC 62282 Part 6. Note that some storage technologies may produce contaminants for which effects are unknown and not addressed by the published standards; these will be addressed by system engineering design on a case by case basis as more information becomes available.

h Total hydrogen lost into the environment as H2; relates to hydrogen accumulation in enclosed spaces. Storage system must comply with appropriate standards, such as ISO-16111:2008 and IEC 62282 Part 6. This includes any coating or enclosure that incorporates the envelope of the storage system.