Beatrice Lang
Scientists and researchers have been working on ways to convert carbon dioxide into electricity, with promising results. One method involves using a nanogenerator made of a polyamine gel and boron nitrate to generate positive and negative ions, which create a diffusion current that can be amplified into electricity. Another approach uses membrane-electrode assemblies to catalyze carbon dioxide into other chemicals, such as carbon monoxide and ethylene, which can be used to create products and fuel. Additionally, researchers at MIT and Harvard University have developed a process to convert carbon dioxide into formate, a liquid or solid material that can be used to power fuel cells and generate electricity. The University of Queensland has also developed a similar method to create sustainable power. Furthermore, a new kind of geothermal power plant is being developed to lock away carbon dioxide underground and use it to boost electric power generation. These advancements in technology offer potential solutions for reducing carbon emissions and mitigating the effects of burning fossil fuels.
| Characteristics | Values |
|---|---|
| Technology | Solar-powered thin-film devices, membrane-electrode assembly, geothermal power plants, nanogenerators |
| Process | Carbon capture and conversion, electrochemical conversion, electrolysis |
| Inputs | Carbon dioxide, solar power, nitrogen, water, potassium or sodium formate, hydrogen |
| Outputs | Fuel, electricity, heat |
| Benefits | Low manufacturing and material costs, compact, zero carbon footprint, stable fuel, improved efficiency, clean electricity, safe storage |
| Limitations | Requires connection to a large CO2 source, low efficiency of membrane-electrode assemblies |
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What You'll Learn
- Using a nanogenerator to convert CO2 into electricity
- Electrolysis to convert CO2 into a powder that can be converted into electricity
- Geothermal power plants that use CO2 to generate electricity
- Solar-powered devices that convert CO2 into fuel
- Membrane-electrode assemblies that use surplus renewable power to catalyze CO2 into electricity
Using a nanogenerator to convert CO2 into electricity
Researchers at the University of Queensland have developed a nanogenerator that can convert carbon dioxide (CO2) into electricity. This technology is carbon negative as it consumes the greenhouse gas CO2 while generating energy. The nanogenerator is made of two components: a polyamine gel that absorbs CO2 and a skeleton of boron nitrate just a few atoms thick that generates positive and negative ions.
The key innovation is that the researchers have found a way to make the positive ions much larger than the negative ions. As a result, the different sizes of the ions cause them to move at different speeds, creating a diffusion current. This diffusion current can then be amplified into electricity to power light bulbs or any other electronic device. According to Dr. Zhuyuan Wang of UQ's Dow Centre for Sustainable Engineering Innovation, "In nature and in the human body, ion transportation is the most efficient energy conversion – more efficient than electron transportation which is used in the power network."
The nanogenerator currently has a small, proof-of-concept design, but the researchers are working on improving its efficiency and reducing costs. They envision two potential applications for the nanogenerator in the future. Firstly, a slightly bigger device could be made portable to generate electricity and power mobile phones or laptops using atmospheric CO2. Secondly, on a larger scale, this technology could be integrated with an industrial CO2 capture process to harvest electricity.
This development holds promise for the future of sustainable energy, as Professor Xiwang Zhang, Director of the Dow Centre, stated: "We want to realize the value in a problematic greenhouse gas and to change the perception of CO2... Until now, CO2 has been seen as a problem to be solved, but it can be a resource for the future."
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Electrolysis to convert CO2 into a powder that can be converted into electricity
Electrolysis can be used to convert CO2 into a powder that can be converted into electricity. This process, developed by researchers at the Massachusetts Institute of Technology (MIT), involves exposing CO2 to catalysts and then applying electrolysis to turn the gas into a powder called sodium formate.
The first step in this process is to capture and concentrate carbon dioxide, either from concentrated streams such as power plant emissions or from low-concentration sources like the open air. This is done through an alkaline solution-based capture, resulting in a liquid metal-bicarbonate solution. Next, through electrochemical conversion using a cation-exchange membrane electrolyzer, the bicarbonate is converted into solid formate crystals or potassium/sodium formate.
The highly concentrated liquid potassium or sodium formate solution produced can be dried through methods such as solar evaporation, resulting in a stable powder that can be stored for years or even decades. This powder can then be used as a feedstock for clean fuel, replacing conventional batteries, and can be utilized in fuel cells to generate electricity.
The entire process, including the electrochemical conversion of gas to powder, was demonstrated at a small, laboratory scale by researchers at MIT and Harvard University. The powder produced is non-toxic, non-flammable, and easy to store and transport, making it a promising alternative to fuels like hydrogen and methanol.
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Geothermal power plants that use CO2 to generate electricity
Geothermal power plants use hydrothermal resources that have both water (hydro) and heat (thermal). They require high-temperature hydrothermal resources (300°F to 700°F) from either dry steam wells or hot water wells. The hot water or steam powers a turbine that generates electricity. Geothermal power plants do not burn fuel to generate electricity, but they may release small amounts of sulfur dioxide and carbon dioxide.
Geothermal power plants emit 97% less acid rain-causing sulfur compounds and about 99% less carbon dioxide than fossil fuel plants of similar size. Most geothermal power plants inject the geothermal steam and water they use back into the earth, which helps to renew the geothermal resource and reduce emissions.
In 2023, the Inflation Reduction Act (IRA) renewed and expanded the PTC, providing up to 2.75 cents per kWh for electricity generated from geothermal resources. An average US coal power plant emits roughly 35 times more carbon dioxide per kWh of electricity generated than a geothermal power plant. Each year, US geothermal electricity offsets the emission of 22 Mt of CO2, 200,000 Mt of nitrogen oxides, and 110,000 t of particulate matter from coal-powered plants.
The US Department of Energy (DOE) is funding research into combining carbon capture and storage with geothermal energy production. While the risks of long-term and high-volume geologic carbon sequestration are uncertain, the potential to use geothermal energy to capture and store carbon dioxide is promising.
Additionally, researchers at the University of Queensland have developed a nanogenerator that absorbs carbon dioxide to generate electricity. This technology consumes carbon dioxide, making it carbon-negative. The nanogenerator is made of a polyamine gel that absorbs CO2 and a skeleton of boron nitrate that generates positive and negative ions. The different sizes of ions create a diffusion current that can be amplified into electricity.
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Solar-powered devices that convert CO2 into fuel
Researchers have been working on developing solar-powered devices that can convert carbon dioxide (CO2) into fuel. One such device, developed by NASA, uses solar-powered thin-film technology to convert CO2 into fuel before it is emitted into the atmosphere. This technology can help mitigate the effects of burning fossil fuels, which are still the world's major fuel source. The device uses metal oxide thin films to produce a photoelectrochemical cell that is powered by solar energy.
Another example is the work being done by researchers at the University of Queensland, who have built a nanogenerator that absorbs CO2 to make electricity. This nanogenerator is made of two components: a polyamine gel that absorbs CO2 and a skeleton of boron nitrate that generates positive and negative ions. The different sizes of these ions create a diffusion current that can be amplified into electricity to power electronic devices.
Researchers at the University of Cambridge have also developed a solar-powered reactor that captures CO2 directly from the air and converts it into syngas, a mixture of hydrogen and carbon monoxide that is used to produce fuels, chemicals, and pharmaceuticals. This reactor does not require fossil fuels or the transport and storage of CO2, making it a more sustainable option.
Additionally, researchers at MIT and Harvard University have developed a process to convert CO2 into formate, a liquid or solid material that can be used like hydrogen or methanol to power a fuel cell and generate electricity. This process involves first converting CO2 into a liquid metal bicarbonate solution, which is then electrochemically converted into liquid potassium or sodium formate. The formate produced by this process is non-toxic, non-flammable, and easy to store and transport.
These solar-powered devices and technologies offer promising solutions for reducing carbon emissions and addressing the world's energy needs in a more sustainable way.
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Membrane-electrode assemblies that use surplus renewable power to catalyze CO2 into electricity
The world is actively seeking ways to extract carbon dioxide from the air and convert it into something useful. One promising idea is to turn it into a stable fuel that can replace fossil fuels. Researchers at MIT and Harvard University have developed a process to convert carbon dioxide into formate, a liquid or solid material that can be used to power a fuel cell and generate electricity.
Membrane-electrode assemblies (MEAs) are a critical component in the effort to reach a net-zero energy economy by 2050. MEAs are used in CO2 reduction electrolyzers, which are negative emission technologies that convert CO2 into value-added products. One of the challenges with these devices is the low utilization of CO2 due to its crossover from the cathode to the anode.
An innovative design of membrane-electrode assembly utilizes a bipolar membrane and a catholyte layer that blocks CO2 crossover, enabling high CO2 single-pass utilization. This design can be easily integrated with renewable power generation (solar and wind) to operate on surplus renewable electricity.
The electrochemical reduction of carbon dioxide to formic acid using membrane-electrode assemblies and renewable electricity has been shown to reduce production costs compared to traditional fossil-based approaches by up to 75%. This approach not only reduces carbon emissions but also decreases the usage of fossil fuels as feed materials for fuel production.
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Frequently asked questions
Carbon dioxide conversion is the process of capturing carbon dioxide and transforming it into valuable feedstocks such as carbon monoxide, ethylene, or fuel.
Carbon dioxide can be converted into electricity through fuel cells that use inputs like hydrogen, formate, or membrane-electrode assemblies.
Formate is a liquid or solid material that can be used like hydrogen or methanol to power a fuel cell and generate electricity.
A membrane-electrode assembly is a device that consists of two electrodes separated by a membrane. These devices can be used to convert carbon dioxide into valuable feedstocks or fuels.
Some examples of carbon dioxide conversion technologies include the use of nanogenerators, geothermal power plants, and solar-powered devices.
