Mercedes Mullins
Titanium has become an attractive material for fuel cells in recent years. Titanium dioxide (TiO2) and titanium nitride (TiN) are two titanium compounds that have been studied for their potential in fuel cell technology. TiN, in particular, has gained attention as a promising material for proton exchange membrane fuel cells due to its high electrical conductivity and resistance to oxidation. The use of titanium in fuel cells has been found to increase performance, reduce methanol crossover in the membrane, and address catalyst poisoning issues. However, the high cost of titanium and the challenge of synthesizing porous titanium compounds remain obstacles to their widespread adoption in fuel cell technology.
| Characteristics | Values |
|---|---|
| Use of titanium in fuel cells | Titanium dioxide nanotubes (TNTs) are used in fuel cells. Titanium fiber felts are used in electrolyzer stacks as the flow field or diffuser material, especially on the oxygen (anode) side. |
| Titanium dioxide nanotubes (TNTs) advantages | TNTs increase fuel cell performance, lower methanol cross-over in the membrane, and overcome catalyst poisoning. |
| Titanium fiber felt advantages | It is ideal for cathode-fed electrolyzer research. It can be used as a diffusion medium for both anode and cathode in unitized fuel cells or electrolyzers or regenerative electrochemical devices. |
| Titanium fiber felt disadvantages | Untreated titanium fiber felt will not be consumed as a carbon Gas Diffusion Layer (GDL). In the presence of oxygen, untreated titanium forms an electrically insulating oxide layer (TiO2) on the surface of the fibers under high O2 pressures, which lowers the electrochemical performance. |
| Titanium nitride (TiN) advantages | TiN has high electrical conductivity and resistance to oxidation, making it a durable electrocatalyst material. It has a lower rate of electrochemical oxidation than carbon black. It has higher electrical conductivity than carbon and outstanding oxidation and acid corrosion resistance. |
| Titanium carbide (TiC) advantages | TiC is a cost-effective, high-performance, and non-precious electrocatalyst for Polymer Electrolyte Membrane Fuel Cell (PEMFC). It has high conductivity and thermo-chemical stability. |
| Titanium carbide (TiC) disadvantages | Facile synthesis procedure for porous TiC with a high surface area is challenging, which constrains its widespread applicability as a catalyst or support material. |
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What You'll Learn
Titanium dioxide nanotubes (TNTs)
TNTs are one-dimensional nanomaterials with large specific surface areas and high aspect ratios. They can be synthesized using various methods, such as the hydrothermal method, anodization method, sol-gel method, and template-assisted method. Each method has its advantages and disadvantages, and further research is needed to optimize these processes and fully understand the material's potential.
TNTs have unique properties that make them suitable for use in fuel cells, photocatalytic systems, energy storage devices, sensors, and environmental analysis systems. They can enhance the performance of these applications with minimal problems. For example, in fuel cells, TNTs can be used with noble catalysts, such as Pt and Pd, to improve performance and lower costs compared to platinum catalysts.
Additionally, titanium dioxide itself has interesting properties. It is insoluble in water, organic solvents, and inorganic acids, but it is slightly soluble in alkali and can be dissolved in strong acids. It is also known by several names, including titanium(IV) oxide and titania, and is widely used as a pigment in paint, sunscreen, and food colouring.
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Titanium nitride nanoparticles
Titanium nitride (TiN) nanoparticles are being explored as a potential material for proton exchange membrane fuel cells. TiN nanoparticles have unique properties, such as high electrical conductivity and resistance to oxidation and acid corrosion, making them promising candidates for fuel cell applications.
TiN nanoparticles have been studied as catalyst supports in PEM fuel cells, specifically for synthesizing Pt/TiN electrocatalysts. They have been found to outperform Pt/C electrocatalysts in terms of electrochemical surface area and catalytic activity, even with the same Pt particle size and loading. This is due to their inert nature and the presence of a native oxide/oxynitride layer on their surface, resulting in a significantly lower rate of electrochemical oxidation compared to carbon black.
The use of TiN nanoparticles in fuel cells offers advantages such as improved durability and performance. TiN's high electrical conductivity enhances its potential as a durable electrocatalyst material. Additionally, its resistance to oxidation and acid corrosion contributes to its longevity in fuel cell applications.
Beyond fuel cells, TiN nanoparticles have also been investigated for their plasmonic properties in solar heat transduction. Experiments have demonstrated that TiN nanoparticles dispersed in water are highly efficient in absorbing sunlight and converting it into heat, making them promising for solar heat applications.
While the use of titanium in fuel cell technology is a recent development, it has already shown significant impacts. Titanium increases fuel cell performance, reduces methanol cross-over in the membrane, and addresses the issue of catalyst poisoning. Additionally, titanium dioxide nanotubes (TNTs) have attracted attention due to their unique properties and potential applications in fuel cell technology.
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Titanium carbide as an electrocatalyst
The development of cost-effective, high-performance, and non-precious electrocatalysts for Polymer Electrolyte Membrane Fuel Cells (PEMFC) is essential to replace Pt-group metal catalysts. Nanostructured transition metal carbides have attracted interest in fuel cells as electrocatalysts or supports due to their high electrical conductivity and thermo-chemical stability. Titanium carbide (TiC) is an alternative non-precious electrocatalyst and support material with outstanding electrical conductivity and mechanical stability.
TiC has shown promising results for fuel cells and electrolyzers. The morphologies of TiC have a strong impact on the performance of the electrocatalyst in different oxidation and reduction reactions. TiC exhibits a much higher specific surface area than other TM-carbides and a low density of 4.93 g/cm3. The unique electronic structure of TiC is caused by the transfer of part of the s- and d-valency electrons of the atoms of Ti to the 2p-states of N, which depletes the electron population of the d-states of Ti.
TiC-based precious metal-free ORR catalysts have been studied by doping heterogeneous atoms. N-doping results in enhanced ORR performance, which can be further elevated by introducing metals such as Fe and Co into TiC powders. The resultant Fe-N/TiC demonstrates the highest ORR activity among the prepared samples, with much higher methanol tolerance than the benchmark 20 wt%Pt/C in alkaline media.
Ruthenium (Ru) particles loaded on titanium carbide (Ru/TiC) have been successfully prepared through a simple reduction method, and their stability and electrocatalytic activity have been investigated. The as-synthesized catalyst was characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Titanium nitride (TiN) is another material that has attracted attention as a promising material for low-temperature proton exchange membrane fuel cells due to its high electrical conductivity and resistance to oxidation.
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Titanium dioxide fuel cell cost
Fuel cells are a promising alternative energy source for the next generation. However, the high cost of fuel cell technology is a significant hindrance to its commercialisation. The catalyst and membrane are the two most commonly used components in fuel cell technology, and they contribute significantly to the overall cost of the technology. For example, platinum, a commonly used catalyst, is expensive. Similarly, membranes such as the Nafion membrane are also costly.
Titanium dioxide (TiO2) has emerged as a potential solution to the high cost of fuel cell technology. TiO2 has attracted attention due to its unique properties, such as transparency and UV absorption capabilities. It is also effective in photocatalysts and as a protective ingredient in sunscreen. In the context of fuel cell technology, titanium dioxide has several advantages. Firstly, it offers good economic potential because its price is relatively low compared to platinum catalysts. Secondly, titanium dioxide has been found to increase fuel cell performance and lower methanol crossover in the membrane. Additionally, it helps overcome catalyst poisoning, a common issue with existing catalysts, which causes them to malfunction.
Despite the benefits of titanium dioxide, there are still challenges with direct liquid fuel cells (DLFCs). The high cost of the catalyst and high catalyst loading remain issues. Other problems include fuel crossover, cathode flooding, the generation of various side products, fuel safety concerns, and unproven long-term durability. These factors collectively hinder the commercialisation of DLFCs, and more research is needed to improve their performance.
Currently, direct methanol fuel cells (DMFCs) and direct ethanol fuel cells (DEFCs) are the only types of DLFCs with commercial products available, while other types remain in the research stage. However, titanium dioxide nanotubes (TNTs) have gained significant attention in recent decades, and their potential in fuel cell technology continues to be explored. Overall, while titanium dioxide shows promise in addressing the cost challenges of fuel cell technology, further advancements and research are necessary to fully realise its potential and make fuel cells a more commercially viable alternative energy source.
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Titanium fiber felt
The use of titanium fiber felt in fuel cells offers several advantages. Firstly, it has excellent corrosion resistance, high electrical conductivity, good thermal conductivity, and lower production costs compared to other materials. Additionally, it can be customized and produced according to specific requirements, with various specifications and performances. Titanium fiber felt also has a three-dimensional network, porous structure, high porosity, large surface area, uniform pore size distribution, and special pressure resistance, making it suitable for a wide range of applications.
One challenge associated with untreated titanium fiber felt is the formation of an electrically insulating oxide layer (TiO2) on the surface of the small-diameter fibers under high oxygen pressures. This oxide coating acts as an electrical insulator, increasing interfacial resistance and lowering electrochemical performance. However, this issue can be addressed by applying a gold or platinum coating to the titanium fiber felt. The platinization of titanium creates a coating that is electrically conductive and chemically stable, extending the lifetime of the material and improving performance.
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Frequently asked questions
The amount of titanium used in a fuel cell depends on the type of fuel cell and the specific application. There is no standard amount of titanium usage, and it varies based on research and development.
Titanium, particularly in the form of titanium dioxide (TiO2) and titanium nitride (TiN), is used in fuel cells to enhance performance, reduce methanol crossover in membranes, address catalyst poisoning issues, and provide cost advantages over platinum catalysts.
Titanium dioxide nanotubes (TNTs) have gained attention due to their unique properties and potential to improve fuel cell performance. They offer cost benefits compared to platinum catalysts and help address issues like catalyst poisoning and methanol crossover.
Titanium nitride nanoparticles (TiN NP) exhibit high electrical conductivity and resistance to oxidation, making them promising materials for low-temperature proton exchange membrane fuel cells. TiN has the potential to act as a durable electrocatalyst and enhance fuel cell performance.
Titanium is used in various fuel cell applications, such as titanium fiber felts in electrolyzer stacks, titanium screen mesh cloths, and titanium-based electrocatalysts. It is also explored in proton exchange membrane fuel cells (PEMFCs) and direct liquid fuel cells (DLFCs).
