University of Queensland researchers have built a generator that absorbs carbon dioxide (CO2) to make electricity.
Dr Zhuyuan Wang from UQ’s Dow Centre for Sustainable Engineering Innovation says the small, proof-of-concept nanogenerator is carbon negative because it consumes the greenhouse gas.
The UQ-developed technology absorbs carbon dioxide and generates electricity. Image credit: University of Queensland“This nanogenerator is made of two components: a polyamine gel that is already used by industry to absorb CO2 and a skeleton a few atoms thick of boron nitrate that generates positive and negative ions,” Dr Wang said. Image credit: University of Queensland
“This nanogenerator is made of two components: a polyamine gel that is already used by industry to absorb CO2 and a skeleton a few atoms thick of boron nitrate that generates positive and negative ions,” Dr Wang said.
“We’ve worked out how to make the positive ions much larger than the negative ions and because the different sizes move at different speeds, they generate a diffusion current which can be amplified into electricity to power light bulbs or any electronic device.
“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 two components were embedded in a hydrogel which is 90 per cent water, cut into 4-centimetre discs and small rectangles and then tested in a sealed box pumped full of CO2.
“When we saw electrical signals coming out, I was very excited but worried I’d made a mistake,” Dr Wang said.
“I double-checked everything, and it was working correctly so I started dreaming about changing the world using this technology.
“This technology goes further than being carbon neutral – it consumes CO2 as it generates energy.
“At present we can harvest around 1 per cent of the total energy carried intrinsically by gas CO2 but like other technologies, we will now wor