MechChem Africa July-August 2022

Fuel for the future: trends in fuel cell production Smart production strategies and technologies to realise hydrogen potential needed by the autonomous driving, connectivity, electrification and shared mobility (ACES) technologies.

• The oxygen on the cathode side is reduced by the electrons and reacts with the H+ ions from the membrane to formH 2 O (water), which is rinsed off. Big automotive companies cautious about hydrogen Unlike battery cells, fuel cells are not de pendent on rawmaterials such as lithium or cobalt. The rawmaterial dependencymeans battery manufacturers are heavily reliant on China. In fuel cells, the central material is iron. Another advantage is that hydrogen as a molecular substance can easily be stored, transported and made available for applica tions. Hydrogen vehicles are already being used inmore andmore commercial vehicles, such as city buses, because they offer more space for the required drive unit. Hydrogen vehicles are still relatively rare in ‘normal’ cars, though, which is partly due to the lack of H 2 filling stations, but also due to the industry’s hesitant implementation. A German study from 2020 published on de.statistica.com entitled ‘The number of new registrations of passenger cars with fuel cells in the European Union from 2014 to 2020’ reported that a total of only 749 passenger cars with fuel cells (FCEVs) were newly registered in Europe. Compared to 2019, this was a minimal increase of 266 passenger cars. Hydrogen vehicles should be an impor tant pillar of climate-friendly mobility if the opportunities and possibilities were researched, expanded and used on a larger scale. European automotive players are often more innovative in this respect and accepting of hydrogen than some large German corporations, which are primarily dedicated to e-mobility. There is no way to avoid New Energy Vehicles or so-called NEVs if we are to come even close to achieving the Paris climate targets. Hydrogen can be produced from renewable energy sources in a CO 2 -neutral way and converted into electrical energy in fuel cells. There are, however, several challenges to be overcome in the production of these fuel cells to ensure efficiency and precision. This applies both to the production of the Automation of electrolysis and fuel cell production

Fuel cells or direct hydrogen combustion engines have a lot to offer when it comes to CO 2 reduction and market options.

W hen people talk about sus tainable mobility, the first thing that comes to mind is battery-powered electric cars. Fuel cells or direct hydrogen combus tion engines are complementary technolo gies that often fade into the background, yet these have a lot to offer when it comes to CO 2 reduction and market options. The German and European automotive industry takes a similar view, as shown in a recent German Expleo study, in which 80% of car manufacturers surveyed stated that they consider hydrogen-powered vehicles to be more environmentally friendly and cleaner than electric cars. 64% believe that the first hydrogen cars ready for series production will be on the market in the next two years. What the report found is needed is more innovative spirit on the part of manufactur ers and suppliers, support from politicians and investments in better energy infra structure. Companies in the autonomous driving, connectivity, electrification and shared mobility (ACES) environment need efficient and future-proof production facili ties, Smart Factories being key. Production lines must be automated and digitalised, manual processes eliminated, and innova tions need to be driven forward. Truly sustainable hydrogen Modern and automated battery and fuel cell production, supported by robotics, sensor technology and AI, are at the heart of sustainable strategies. The battery is the central element of both hydrogen and

‘classic’ e-drives. In addition to e-drives and hydrogen, e-fuels and synthetic fuels should also be mentioned in the mix of sustainable vehicle types. But to use hydrogen in a truly sustainable way, the H 2 fuel must be produced with electricity from renewable sources, such as via electrolysis that are powered using green energy, which is not yet fully feasible in large quantities. In fuel-cell based hydrogen vehicles: hydro gen (H 2 ) and oxygen (O) are converted into electricity and water (H 2 O) in the fuel cell. The resulting electrical energy drives the vehicle’s electric motor. Fuel cell cars are therefore also electric cars, although the battery does not have to be charged before driving. Instead, the required electricity can be produced in the car by the onboard H 2 supply. The energy conversion from chemical to electrical energy in a polymer electrolyte membrane (PEM) fuel cell is based on the following functional principle: • Hydrogen is delivered to the anode and oxygen to the cathode via the flow channels of the bipolar half-plates (BPHP). • Via the gas diffusion layer (GDL), the hydrogen diffuses to the anode side of the catalyst-coated membrane (CCM). • Hydrogen is catalytically oxidised, re leasing electrons and forming H+ ions that pass through the wet membrane to the cathode side. • The electrons are conducted to the cathode side via an external circuit. Conversion of the chemical into electrical energy

38 ¦ MechChem Africa • July-August 2022