World's Fastest Hydrogen Sensor Could Pave the Way for Clean Energy and Hydrogen Economy
Fast and accurate sensors are crucial in a sustainable society where hydrogen is an energy carrier. Hydrogen gas is produced by splitting water with the help of electricity that has been produced with wind power or solar cells. The sensors are needed both when the hydrogen is produced and when it is used, for example in cars powered by a fuel cell. To avoid the formation of flammable and explosive “knallgas” when hydrogen is mixed with air, the hydrogen sensors need to be able to quickly detect leaks.
Illustration: Yen Strandqvist
The researchers’ ground-breaking results were recently published in the prestigious scientific journal Nature Materials. The discovery is an optical nanosensor encapsulated in a plastic material. The sensor works based on an optical phenomenon – a plasmon – which occurs when metal nanoparticles are illuminated and capture visible light. The sensor simply changes colour when the amount of hydrogen in the environment changes.
The plastic around the tiny sensor is not just for protection, but functions as a key component. It increases the sensor’s response time by accelerating the uptake of the hydrogen gas molecules into the metal particles where they can be detected. At the same time, the plastic acts as an effective barrier to the environment, preventing any other molecules from entering and deactivating the sensor. The sensor can therefore work both highly efficiently and undisturbed, enabling it to meet the rigorous demands of the automotive industry – to be capable of detecting 0.1 percent hydrogen in the air in less than a second.
Credit Mia Halleröd Palmgren
It was during his time as a PhD student that Ferry Nugroho and his supervisor Christoph Langhammer realised that they were on to something big. After reading a scientific article stating that no one had yet succeeded in achieving the strict response time requirements imposed on hydrogen sensors for future hydrogen cars, they tested their own sensor. They realised that they were only one second from the target – without even trying to optimise it. The plastic, originally intended primarily as a barrier, did the job better than they could have imagined, by also making the sensor faster. The discovery led to an intense period of experimental and theoretical work.
“In that situation, there was no stopping us. We wanted to find the ultimate combination of nanoparticles and plastic, understand how they worked together and what made it so fast. Our hard work yielded results. Within just a few months, we achieved the required response time as well as the basic theoretical understanding of what facilitates it,” says Ferry Nugroho.
Detecting hydrogen is challenging in many ways. The gas is invisible and odourless, but volatile and extremely flammable. It requires only four percent hydrogen in the air to produce oxyhydrogen gas, sometimes known as knallgas, which ignites at the smallest spark. In order for hydrogen cars and the associated infrastructure of the future to be sufficiently safe, it must therefore be possible to detect extremely small amounts of hydrogen in the air. The sensors need to be quick enough that leaks can be rapidly detected before a fire occurs.
“It feels great to be presenting a sensor that can hopefully be a part of a major breakthrough for hydrogen-powered vehicles. The interest we see in the fuel cell industry is inspiring,” says Christoph Langhammer, Professor at Chalmers Department of Physics.
“The amount of hydrogen gas in our breath can provide answers to, for example, inflammations and food intolerances. We hope that our results can be used on a broad front. This is so much more than a scientific publication,” says Christoph Langhammer.
In the long run, the hope is that the sensor can be manufactured in series in an efficient manner, for example using 3D printer technology.
Illustration of the sensor technique: Ella Marushchenko
Credit: Ella Marushchenko
- The Chalmers-developed sensor is based on an optical phenomenon – a plasmon – which occurs when metal nanoparticles are illuminated and capture light of a certain wavelength.
- The optical nanosensor contains millions of metal nanoparticles of a palladium-gold alloy, a material which is known for its sponge-like ability to absorb large amounts of hydrogen. The plasmon phenomenon then causes the sensor to change colour when the amount of hydrogen in the environment changes.
- The plastic around the sensor is not only a protection, but also increases the sensor’s response time by facilitating hydrogen molecules to penetrate the metal particles more quickly and thus be detected more rapidly. At the same time, the plastic acts as an effective barrier to the environment because no other molecules than hydrogen can reach the nanoparticles, which prevents deactivation.
- The efficiency of the sensor means that it can meet the strict performance targets set by the automotive industry for application in hydrogen vehicles of the future by being capable of detecting 0.1 percent hydrogen in the air in less than one second.
- The research was funded by the Swedish Foundation for Strategic Research, within the framework of the Plastic Plasmonics project.
Citation: Metal–polymer hybrid nanomaterials for plasmonic ultrafast hydrogen detection
Ferry A. A. Nugroho, Iwan Darmadi, Lucy Cusinato, Arturo Susarrey-Arce, Herman Schreuders, Lars J. Bannenberg, Alice Bastos da Silva Fanta, Shima Kadkhodazadeh, Jakob B. Wagner, Tomasz J. Antosiewicz, Anders Hellman, Vladimir P. Zhdanov, Bernard Dam, Christoph Langhammer. . Nature Materials, 2019; DOI: 10.1038/s41563-019-0325-4
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