Direct methanol fuel cell

Direct-methanol fuel cell

Direct-methanol fuel cells or DMFCs are a subcategory of proton-exchange fuel cells in which methanol is used as the fuel. Their main advantage is the ease of transport of methanol, an energy-dense yet reasonably stable liquid at all environmental conditions. Efficiency is presently quite low for these cells, so they are targeted especially to portable applications, where energy and power density are more important than efficiency.

A more efficient version of a direct fuel cell would play a key role in the theoretical use of methanol as a general energy transport medium, in the hypothesized (proposed) methanol economy.

The Cell

In contrast to indirect methanol fuel cells, where methanol is reacted to hydrogen by steam reforming, DMFCs use a methanol solution (usually around 1M, i.e. about 3% in mass) to carry the reactant into the cell; common operating temperatures are in the range 50–120 °C, where high temperatures are usually pressurized. DMFCs themselves are more efficient at high temperatures and pressures, but these conditions end up causing so many losses in the complete system that the advantage is lost;^[1] therefore, atmospheric-pressure configurations are currently preferred.

Because of the methanol cross-over, a phenomenon by which methanol diffuses through the membrane without reacting, methanol is fed as a weak solution: this decreases efficiency significantly, since crossed-over methanol, after reaching the air side (the cathode), immediately reacts with air; though the exact kinetics are debated, the end result is a reduction of the cell voltage. Cross-over remains a major factor in inefficiencies, and often half of the methanol is lost to cross-over.

Other issues include the management of carbon dioxide created at the anode, the sluggish dynamic behavior, and the ability to maintain the solution water.

The only waste products with these types of fuel cells are carbon dioxide and water.

History

In 1990 superacid specialist Dr. Surya Prakash, and Nobel laureate Dr. George A. Olah, both of the University of Southern California's Loker Hydrocarbon Research Institute, invented a fuel cell that would directly convert methanol to electricity. USC, in a collaborative effort with Jet Propulsion Laboratory (JPL) proceeded to invent the direct oxidation of liquid hydrocarbons subsequently coined as DMFC, Direct Methanol Fuel Cell Technology. Others were involved in the invention, including California Institute of Technology (Caltech) and DTI Energy, Inc. Some advances in DMFC have been: bringing down the fuel crossover, miniaturizing the cell for consumer and military products, ceramic plates, carbon nanotubes, porous silicon layers and oxidation reduction.^[2]

Application

Current DMFCs are limited in the power they can produce, but can still store a high energy content in a small space. This means they can produce a small amount of power over a long period of time. This makes them presently ill-suited for powering large vehicles (at least directly), but ideal for smaller vehicles such as forklifts and tuggers^[3] and consumer goods such as mobile phones, digital cameras or laptops. Military applications of DMFCs are an emerging application since they have low noise and thermal signatures and no toxic effluent. These applications include power for soldier-carried tactical equipment, battery chargers, and autonomous power for test and training instrumentation. Units are currently available with power outputs between 25 watts and 5 kilowatts with durations up to 100 hours between refuelings.

Methanol

Methanol is a liquid from -97.0 °C to 64.7 °C at atmospheric pressure. The energy density of methanol is an order of magnitude greater than even highly compressed hydrogen, and 15 times higher than Lithium-ion batteries.

Methanol is toxic and flammable. However, the International Civil Aviation Organization's (ICAO) Dangerous Goods Panel (DGP) voted in November 2005 to allow passengers to carry and use micro fuel cells and methanol fuel cartridges when aboard airplanes to power laptop computers and other consumer electronic devices. On September 24, 2007, the US Department of Transportation issued a proposal to allow airline passengers to carry fuel cell cartridges on board.^[4] The Department of Transportation issued a final ruling on April 30, 2008, permitting passengers and crew to carry an approved fuel cell with an installed methanol cartridge and up to two additional spare cartridges.^[5] It is worth noting that 200 ml maximum methanol cartridge volume allowed in the final ruling is double the 100 ml limit on liquids allowed by the Transportation Security Administration in carry-on bags.^[6]

Reaction

The DMFC relies upon the oxidation of methanol on a catalyst layer to form carbon dioxide. Water is consumed at the anode and is produced at the cathode. Protons (H⁺) are transported across the proton exchange membrane - often made from Nafion - to the cathode where they react with oxygen to produce water. Electrons are transported through an external circuit from anode to cathode, providing power to connected devices.

The half-reactions are:

	Equation
Anode	$\mathrm{CH_3OH + H_2O \to 6\ H^+ + 6\ e^- + CO_2}$ oxidation
Cathode	$\mathrm{\frac{3}{2} O_2 + 6\ H^+ + 6\ e^- \to 3\ H_2O}$ reduction
Overall reaction	$\mathrm{CH_3OH + \frac{3}{2} O_2 \to 2\ H_2O + CO_2}$ redox reaction

Methanol and water are adsorbed on a catalyst usually made of platinum and ruthenium particles, and lose protons until carbon dioxide is formed. As water is consumed at the anode in the reaction, pure methanol cannot be used without provision of water via either passive transport such as back diffusion (osmosis), or active transport such as pumping. The need for water limits the energy density of the fuel.

Currently, platinum is used as a catalyst for both half-reactions. This contributes to the loss of cell voltage potential, as any methanol that is present in the cathode chamber will oxidize. If another catalyst could be found for the reduction of oxygen, the problem of methanol crossover would likely be significantly lessened. Furthermore, platinum is very expensive and contributes to the high cost per kilowatt of these cells. During the methanol oxidation reaction carbon monoxide (CO) is formed, which strongly adsorbs onto the platinum catalyst, reducing the surface area and thus the performance of the cell. The addition of another components, such as ruthenium or gold, to the catalyst tends to ameliorate this problem because, according to the most well-established theory in the field, these catalysts oxidize water to yield OH radicals: H₂O → OH• + H⁺ + e^-. The OH species from the oxidized water molecule oxidizes CO to produce CO₂ which can then be released as a gas: CO + OH• → CO₂ + H⁺ + e^-.

Using these OH groups in the half reactions, they are also expressed as:

	Equation
Anode	$\mathrm{CH_3OH + 6\ OH^- \to 5\ H_2O + 6\ e^- + CO_2}$ oxidation
Cathode	$\mathrm{\frac{3}{2} O_2 + 3\ H_2O + 6\ e^- \to 6\ OH^-}$ reduction
Overall reaction	$\mathrm{CH_3OH + \frac{3}{2} O_2 \to 2\ H_2O + CO_2}$ redox reaction

Cross-over Current

Methanol on the anodic side is usually in a weak solution (from 1M to 3M), because methanol in high concentrations has the tendency to diffuse through the membrane to the cathode, where its concentration is about zero because it is rapidly consumed by oxygen. Low concentrations help in reducing the cross-over, but also limit the maximum attainable current.

The practical realisation is usually that a solution loop enters the anode, exits, is refilled with methanol, and returns to the anode again.

Water Drag

The water in the anodic loop is lost because of the anodic reaction, but mostly because of the associated water drag: every proton formed at the anode drags a number of water molecules to the cathode. Depending on temperature and membrane type, this number can be between 2 and 6.

Ancillary Units

A direct methanol fuel cell is usually part of a larger system including all the ancillary units that permit its operation. Compared to most other types of fuel cells, the ancillary system of DMFCs is relatively complex. The main reasons for its complexity are:

• providing water along with methanol would make the fuel supply more cumbersome, so water has to be recycled in a loop;
• CO₂ has to be removed from the solution flow exiting the fuel cell;
• water in the anodic loop is slowly consumed by reaction and drag; it is necessary to recover water from the cathodic side to maintain steady operation.

See also

• Alkali anion exchange membrane
• Dynamic hydrogen electrode
• Glossary of fuel cell terms
• Portable fuel cell applications
• Liquid fuels
• Methanol (data page)
• Methanol economy

References

1. ^ Dohle, H.; Mergel, J. & Stolten, D.: Heat and power management of a direct-methanol-fuel-cell (DMFC) system, Journal of Power Sources, 2002, 111, 268-282.
2. ^ DMFC Machine-History.com
3. ^ Tenn. Nissan Plant to Use Methanol to Cut Costs by ABC News.
4. ^ US Department of Transportation moves to approve fuel cells for aircraft use, by FuelCellToday.
5. ^ Hazardous Materials: Revision to Requirements for the Transportation of Batteries and Battery-Powered Devices; and Harmonization with the United Nations Recommendations, International Maritime Dangerous Goods Code, and International Civil Aviation Organization's Technical Instructions, by the US department of transportation.
6. ^ 3-1-1 Gains International Acceptance, by the US transport security administration.

Merhoff, Henry and Helbig, Peter: Development and Fielding of a Direct Methanol Fuel Cell; ITEA Journal, March 2010

External links

• Fuel Cell Today. An internet portal of news and articles of fuel cell developments
• 12th Small Fuel Cells. Annual conference on portable fuel cell technology developments