Katerina Swanson
Fuel cells are an innovative technology that can efficiently convert chemical energy into electricity. While fuel cells offer a promising alternative to traditional power sources, there are concerns about their recyclability. The recycling and waste disposal of fuel cells are challenging due to the limited valuable materials that can be extracted, such as platinum, and the chemical processes required to separate them. Additionally, the toxicity of some materials necessitates special disposal methods. However, with advancements in technology and the growing importance of addressing climate change, exploring efficient and economically viable recycling methods for fuel cells is essential.
| Characteristics | Values |
|---|---|
| Recyclable Parts of a Fuel Cell | Platinum |
| Current Recycling Methods | Hydrometallurgical and pyro-hydrometallurgical methods |
| Novel Recycling Methods | Efficient, safe, and cost-competitive pathways |
| Issues with Recycling | Energy required for recycling, low platinum content, chemical combination with other materials |
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What You'll Learn
Platinum recovery
Platinum is a key catalyst in the process of generating electricity from hydrogen, a clean fuel that only produces water when burned. However, platinum is expensive and degrades unevenly in fuel cells, resulting in usable platinum being wasted when worn-out fuel cells are replaced.
One standard method of recovering platinum from fuel cell parts is by burning the parts and collecting the platinum from the resulting ash. However, this method requires larger parts to be chopped prior to burning. Another method involves introducing an oxidizing acidic solution to the fuel cell stack's ports without disassembling the stack. The solution is then recovered and treated, which may include using it in an electroplating or electrochemical process or precipitating a platinum salt from the solution, possibly with subsequent calcining.
A study on the dissolution of platinum from a Pt/C fuel cell electrocatalyst in a solution of low concentration HCl at 90 °C for 120 minutes in the absence of an oxidant found that the leachability of platinum was approximately 76%. The use of various oxidizing agents such as HNO3, H2O2, NaClO, and NaClO3, with the latter being the most effective, increased the leaching efficiency from 76% to 88%.
The development of strategies to reduce platinum waste and improve fuel cell durability is an ongoing area of research. For example, the addition of counter-flow channels could help reduce inlet/outlet variability, and higher-temperature operation could help maintain lower relative humidity, thus reducing platinum degradation.
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$129.19 $135.99
Perfluorosulfonic acid extraction
Perfluorosulfonic acid (PFSA) is a key material used in proton-exchange membrane fuel cells (PEMFCs). PFSA is a fluorinated membrane polymer that acts as a proton conductor, allowing current to pass through and providing energy. PFSA-based PEMs are the commercial standard due to their high proton conductivity and good chemical stability.
PFSA consists of three regions: a polytetrafluoroethylene (PTFE), or Teflon, backbone, side chains that connect the backbone to the third region, and ion clusters consisting of sulfonic acid ions. When the membrane becomes hydrated, the hydrogen ions in the third region become mobile, bonding to water molecules and moving between sulfonic acid sites.
PFSA has excellent chemical resistance, thermal stability, mechanical properties, and oxidation resistance, making it ideal for fuel cells. PFSA membranes, such as Nafion, are widely used in fuel cells due to their ability to maintain proton conductivity and fuel cell performance in low humidity conditions.
However, PFSA membranes have some limitations, such as poor conductivity in anhydrous conditions, high manufacturing costs, and degradation of properties at higher temperatures. To address these limitations, researchers have developed composite membranes incorporating multifunctional organic, inorganic, and hybrid fillers. These composite membranes offer improved stability and conductivity while maintaining fuel cell performance in low humidity conditions, enhancing the possibility of commercial applications for PEMFCs.
Various processes can extract PFSA from the membrane electrode assembly of a PEM fuel cell without incineration or producing hydrofluoric acid gas. These processes are essential for recycling and reusing PFSA in fuel cell applications.
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End-of-life technologies
End-of-life (EoL) technologies are essential to support the deployment of fuel cells and hydrogen (FCH) products. While fuel cells offer significant advantages in terms of energy efficiency and reduced pollution compared to traditional power generation methods, the recycling and waste disposal of fuel cells remain a challenge due to the newness of the technology.
Current EoL technologies focus on recovering valuable materials from the stacks of proton exchange membrane fuel cells, water electrolysers, alkaline water electrolysers, and solid oxide fuel cells. The primary method for recycling fuel cells involves hydrometallurgical and pyro-hydrometallurgical processes to recover noble metals, especially platinum. Platinum is a valuable resource, but it is combined with other materials chemically, making separation challenging and energy-intensive.
Novel EoL methods aim to improve the recovery of additional materials while maintaining efficiency, safety, and cost-competitiveness. For instance, Anion Exchange Membrane Fuel Cells (AEMFCs) and Electrolyzers (AEMEs) have emerged as environmentally friendly and sustainable energy conversion devices. AEMFCs produce clean energy with high energy density and conversion efficiency, while AEMEs generate ultra-pure H2 and O2.
Additionally, there is a growing trend toward developing hybrid and composite ultra-thin PEMs with tailored properties to enhance water uptake, mechanical strength, and chemical stability. These advancements facilitate recycling and re-utilization, contributing to a more environmentally friendly circular economy.
While the recycling of fuel cells is not yet economically viable due to the low platinum content and the complexity of the process, it is crucial to continue researching and improving EoL technologies. As the market expands and recycling processes become more efficient, hydrogen fuel cells can become a sustainable alternative to traditional engines, particularly in the automobile industry.
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Recycling viability
Fuel cells are an efficient and clean source of energy, especially when compared to traditional power generation methods. They are electrochemical cells that use hydrogen fuel and an oxidizing agent, usually oxygen, to produce electricity. This process does not generate any pollutants, except for carbon dioxide, making fuel cells an attractive option for reducing carbon emissions.
However, the recycling viability of fuel cells is a complex issue. Currently, there is limited economic incentive to recycle fuel cells as the process is not cost-effective, and the valuable materials that can be extracted, such as platinum, are minimal and challenging to separate. The energy required to recycle fuel cells is also a barrier, as it can be comparable to the energy needed to recycle and dispose of internal combustion vehicles.
Despite these challenges, the recycling of fuel cells is an active area of research and development. Novel end-of-life (EoL) technologies are being explored to recover valuable materials from proton exchange membrane fuel cells. These methods aim to efficiently and safely extract noble metals and other materials for refinement. Additionally, the design of proton-exchange membranes (PEMs) is evolving to be more environmentally friendly, with a focus on facilitating recycling and reuse.
To improve the recycling viability of fuel cells, several strategies can be employed. Firstly, reducing the reliance on platinum in fuel cells can decrease costs and simplify the recycling process. Secondly, developing local recycling processes can minimize transportation energies, especially for platinum, which is often mined in other continents. Finally, advancements in hydrogen production, such as utilizing solar power, can enhance the overall sustainability of fuel cells, making them a more attractive alternative to traditional engines.
In conclusion, while the recycling viability of fuel cells is currently limited by economic and technical factors, ongoing innovations in fuel cell design, recycling technologies, and hydrogen production methods offer promising avenues for improving the recyclability of this clean energy source.
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Cost-effectiveness
Fuel cells have been identified as a key enabler in the decarbonisation of transport. However, cost, performance, and durability are still key challenges in the fuel cell industry. The U.S. Department of Energy (DOE) is working to overcome these technical barriers by focusing on the development of low-cost fuel cell stacks and advanced high-volume manufacturing approaches to reduce overall system costs.
Platinum is one of the largest cost components of a direct hydrogen-fuelled polymer electrolyte membrane fuel cell. Therefore, there is an emphasis on approaches that will increase activity and utilisation while reducing the content of current platinum group metal (PGM) catalysts. Researchers are actively seeking alternatives to platinum to reduce costs and improve sustainability. Some of these alternatives include non-precious metal catalysts, such as those based on iron or cobalt, and alloy catalysts. While these alternatives are still under development, they may not yet match the performance and durability of platinum-based catalysts.
Another way to reduce costs is to extend the lifespan of the fuel cell. End-of-Life (EoL) technologies and strategies are being developed to recover valuable materials from proton exchange membrane fuel cells, water electrolysers, alkaline water electrolysers, and solid oxide fuel cells. Current EoL technologies focus on recovering noble metals, while novel methods aim to recover additional materials through efficient, safe, and cost-competitive pathways.
Fuel cell efficiency is another factor that influences cost-effectiveness. Fuel cell efficiency is defined as the effectiveness of a fuel cell in converting chemical energy into electrical energy, which is influenced by factors such as the morphology and structure of the carbon used in electrode synthesis. Pressurisation can improve fuel cell efficiency by increasing stack voltage at a given current density. However, a considerable fraction of stack power is needed to compress air, and it is challenging to achieve good efficiencies with inexpensive compressor-turbine systems. Therefore, fuel cell engine designers must carefully consider the trade-offs between efficiency, power density, and cost when operating at different pressures.
In addition to technical factors, the cost-effectiveness of fuel cells are influenced by economic assessments, such as the total cost of ownership (TCO). For heavy-duty on-road and off-road vehicles, hydrogen and electricity prices are the most influential parameters for TCO. FCEV trucks can be economically feasible but are strongly influenced by hydrogen price and vehicle capital expenditure. The high contribution of fuel cost to TCO means that FCEVs can become more competitive with increasing mileage, as seen with BEV urban logistic vehicles.
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Frequently asked questions
Fuel cells are a new technology, and currently, it is not economically viable to recycle them. However, as the technology develops, it is likely that more efficient and cost-effective recycling methods will be discovered.
The primary material of value within a fuel cell is platinum. However, there is very little platinum in fuel cells, and it is often chemically combined with other materials, requiring a complex separation process.
Fuel cells that cannot be recycled are sent to landfill or disposed of as waste. Some of the materials within fuel cells are toxic, and so require special disposal procedures.
