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| Proton exchange membrane fuel cell | |
|---|---|
| Name | Proton exchange membrane fuel cell |
| Caption | Schematic of a PEM fuel cell stack |
| Type | Electrochemical energy conversion device |
| Invented | 1960s |
| Inventor | GE researchers |
| Fuel | Hydrogen |
| Oxidant | Oxygen |
| Output | Electricity and water |
Proton exchange membrane fuel cell A proton exchange membrane fuel cell (PEMFC) is an electrochemical device that converts chemical energy from Hydrogen and Oxygen into electrical energy, producing Water and heat as byproducts. Developed in the 1960s by researchers at GE for use in NASA space missions, PEMFCs have since been explored by companies and institutions such as Ballard Power Systems, Toyota, Honda, General Motors, and Daimler for transportation, stationary, and portable power applications. Contemporary research and commercialization efforts involve collaborations among universities like MIT, Stanford University, University of California, Berkeley, national laboratories such as National Renewable Energy Laboratory, and consortia including the Fuel Cell and Hydrogen Energy Association.
PEMFCs belong to the family of Fuel cell technologies alongside Solid oxide fuel cell, Alkaline fuel cell, and Molten carbonate fuel cell, distinguished by a solid polymer electrolyte known as a proton exchange membrane. Key industrial actors—Ballard Power Systems, Plug Power, Cummins, Hydrogenics, and FuelCell Energy—develop stacks combining cells to meet voltage and power requirements for vehicles like the Toyota Mirai, buses from Van Hool, and backup systems for data centers operated by Google and Microsoft. Policy frameworks and funding by entities such as the European Commission, U.S. Department of Energy, METI, and programs like the Horizon 2020 initiative shape deployment pathways.
A PEMFC cell comprises an anode, cathode, catalyst layers often based on Platinum supported on carbon from firms like Johnson Matthey, a polymer electrolyte membrane such as Nafion developed by DuPont, gas diffusion layers manufactured by suppliers including SGL Carbon, and bipolar plates fabricated from materials supplied by BASF or Toray Industries. Stack integration uses compression hardware and balance-of-plant components provided by companies like Bosch and Honeywell for humidification, pumps, valves, and power electronics. Standards and testing protocols from organizations such as ISO, SAE International, and IEC govern safety, performance, and interoperability.
PEMFC operation relies on electrochemical oxidation of Hydrogen at the anode and reduction of Oxygen at the cathode. At the anode platinum catalyst sites facilitate the reaction H2 → 2H+ + 2e−, with protons transported through the membrane while electrons flow through external circuits powering loads like traction motors in vehicles developed by Tesla-partnered initiatives or marine systems by ABB. The cathode reaction ½O2 + 2H+ + 2e− → H2O completes the circuit, producing heat managed by cooling systems from suppliers such as Modine Manufacturing. System control strategies draw on work from research groups at Imperial College London and ETH Zurich, leveraging diagnostics and sensors from firms like Siemens.
PEMFC performance metrics include power density (W/cm2), current-voltage polarization curves characterized in literature from Argonne National Laboratory and Los Alamos National Laboratory, and system efficiency influenced by operating temperature, pressure, and stoichiometry. Automotive stacks by Toyota and Honda report system efficiencies often above 50% under ideal conditions, while combined heat and power installations by Bloom Energy-adjacent ventures aim to utilize waste heat to boost total energy utilization. Durability goals set by programs such as the U.S. DOE target thousands of operating hours; real-world duty cycles studied by National Renewable Energy Laboratory and fleet demonstrations run by United Parcel Service and transit agencies provide empirical performance data.
Membrane materials like Nafion and alternative ionomers developed at University of Delaware and Los Alamos National Laboratory face chemical and mechanical degradation mechanisms studied using techniques from Lawrence Berkeley National Laboratory. Catalyst degradation, including platinum dissolution and carbon support corrosion, is a central concern addressed by research at Argonne National Laboratory and industrial R&D at Johnson Matthey and Umicore. Strategies to mitigate degradation include alloy catalysts (research by MIT and ETH Zurich), non-precious metal catalysts investigated at Oak Ridge National Laboratory, advanced membranes from 3M Company, and protective coatings from materials groups at Corning Incorporated.
PEMFCs are deployed in passenger vehicles such as the Toyota Mirai and Hyundai Nexo, in buses operated in cities like London, Seoul, and Tokyo, and in material handling equipment produced by Plug Power and Jungheinrich. Stationary backup and distributed generation systems serve data centers and telecom sites for companies including Google, NTT, and Verizon. Maritime projects involve collaborations with Carnival Corporation and research programs at Wärtsilä; aerospace demonstrations have been pursued by Airbus and Boeing research partnerships. Deployment is supported by hydrogen infrastructure initiatives like the H2 Mobility consortium and national strategies in Germany, Japan, South Korea, and the United States.
Major challenges include cost reduction, driven by platinum loading and membrane expenses tackled by suppliers and research consortia including European Fuel Cell Forum and Hydrogen Council partners; durability improvements targeted by U.S. DOE programs; and scaling of hydrogen supply chains coordinated by agencies such as International Energy Agency. Future developments focus on low-platinum or platinum-group-metal-free catalysts from groups at Stanford University and University of Oxford, advanced membrane chemistries from 3M and academic labs, system integration with renewable hydrogen from projects by Ørsted and Shell, and policy incentives shaped by legislation like the Inflation Reduction Act and regional mandates in California.