Electrochemical fuel cells are envisaged as a potential successor technology to combustion engines in the automotive sector. Although studies have considered numerous gaseous elements as the fuel source for electrochemical stacks, hydrogen (H2) remains the primary element of interest in automotive engineering. Gas analysers have proven instrumental in demonstrating the advantages and drawbacks of hydrogen fuel cell technology, and continue to provide accurate, quantitative insights for ongoing research and development (R&D).
The focus on hydrogen in fuel cell research is primarily due to the element’s high energy yield and relatively clean nature. Scientific and mainstream media have increasingly extolled the drawbacks of petroleum-based fuels in recent decades, yet the lack of a cost-effective, high energy alternative has complicated efforts to replace combustion technology with a more sustainable solution.
In this blog post, Hiden Analytical explores the importance of gas analysers in R&D of hydrogen fuel cells.
Demonstrating the Need for Fuel Cells
Ambient and process gas analysers have increasingly underlined the dangers of vehicular fossil fuel emissions and ambient air pollution. The Environmental Protection Agency (EPA) estimates that as much as 27% of greenhouse emissions in the US are attributable to vehicles on the road. These emissions contribute to the generation of hazardous ground-level ozone (O3), which can cause respiratory distress in humans and animals and is extremely damaging to natural ecosystems. It is also one of the primary contributors to summertime smog in urban environments.
It is difficult to quantify the human health impacts of vehicle emissions, but recent research suggests that as many as 385,000 people died in 2015 alone as a direct result of air pollution from vehicle emissions. Gas analysers have been essential in demonstrating the environmental and human health burden of volatile organic compounds (VOCs) emitted by vehicle exhausts. Quantitatively demonstrating the dangers of vehicle emissions has catalysed interest in new, immature technologies such as hydrogen fuel cells.
Outlining Hydrogen Fuel Cells
Although there are numerous contending fuel cell architectures, they all operate on a similar electrochemical process. The energy potential of a stored fuel source is extracted via catalytic oxidation in a clean and silent process. They consist of an electrolyte, an anode, and a cathode which ionises hydrogen atoms to generate a direct current (DC) that is conditioned into an alternating current (AC). Immediate benefits of this architecture include long service lives if the cell stack is continually replenished with a source of hydrogen and an appropriate oxidant.
However, gas analysers are required to perform quality control of these individual elements to guarantee the efficiency of the electrochemical process. It is also important to monitor and characterise the emissions generated by fuel cells using hydrogen compounds rather than pure hydrogen as an energy source. Although abundant on earth, hydrogen is not readily available. Natural gas and methanol are envisaged as potential solutions to this issue, but both will generate pollutants that must be characterised to legitimise the green credentials of the technology.
Gas Analysers from Hiden Analytical
Hiden Analytical supplies an extensive range of gas analysers suitable for R&D and process control of hydrogen fuel cells, to support new levels of efficiency from electrochemical alternatives to petroleum-based fuels.
Our QIC Series gas analysers can reliably analyse reaction mixtures and product composition to detect impurities in hydrogen supplies and optimise the efficiency of fuel cell devices. It boasts a detection range from the parts per billion (ppb) level up to 100% concentration, providing outstanding resolution for quantifying gases in various compounds. The QIC Series gas analysers also feature a mass range of 200 amu for detecting ammonia (NH3), hydrogen, and methane in gas streams.
The QIC series gas analysis systems include special sampling options developed for analysis of gas/vapour sample streams typical in fuel cell R&D, including high concentrations of light gases, hydrogen, water vapour, corrosive, flammable and explosive mixtures.
[Source: Science X]