Recently, India's first green hydrogen-based advanced fuel cell electric vehicle (FCEV) was launched. It has no tailpipe emissions other than
Water
Understanding Green Hydrogen Fuel Cell Electric Vehicle Emissions
India's recent launch of the first green hydrogen-based advanced fuel cell electric vehicle (FCEV) marks a significant step towards sustainable transportation. A key characteristic of these vehicles is their minimal environmental impact, especially regarding tailpipe emissions.
Let's explore what comes out of the tailpipe of such an FCEV.
How Fuel Cell Electric Vehicles (FCEVs) Work
An FCEV uses a fuel cell stack to generate electricity. This electricity powers the vehicle's electric motor. The fuel cell combines hydrogen (stored onboard the vehicle) with oxygen (taken from the air) in a chemical reaction. This reaction produces electricity, heat, and water.
The fundamental chemical reaction in a hydrogen fuel cell is:
\(\text{2H}_2 \text{ (Hydrogen)} + \text{O}_2 \text{ (Oxygen)} \rightarrow \text{2H}_2\text{O} \text{ (Water)} + \text{Electricity} + \text{Heat}\)
FCEV Tailpipe Emissions
As shown by the chemical equation, the primary product of the reaction between hydrogen and oxygen in a fuel cell is water (\(\text{H}_2\text{O}\)). This water is expelled from the vehicle's tailpipe, typically in the form of water vapour or liquid water, depending on the ambient temperature and operating conditions.
The question asks about the tailpipe emissions other than the main product. However, the phrasing "no tailpipe emissions other than" strongly suggests that the *only* significant emission from a well-functioning hydrogen fuel cell vehicle's tailpipe is water.
Analyzing the Options
Let's consider the provided options in the context of a hydrogen fuel cell's operation:
- Hydrogen peroxide: Hydrogen peroxide (\(\text{H}_2\text{O}_2\)) is not a direct product of the intended reaction in a standard hydrogen fuel cell designed for vehicle propulsion. While it can be formed under specific, non-ideal conditions in some electrochemical systems, it is not the typical or designed tailpipe emission of an FCEV.
- Nitrogen: Air, which provides the oxygen for the fuel cell reaction, is composed mostly of nitrogen (about 78%). Nitrogen does not participate in the electrochemical reaction within the fuel cell. Therefore, nitrogen from the air simply passes through the fuel cell system and is expelled, but it is not a product of the reaction and is not considered a pollutant emission in this context as it's just air being processed. The question asks for an *emission* other than water, implying a product or byproduct. Nitrogen is essentially an input that isn't consumed.
- Oxygen: Oxygen (\(\text{O}_2\)) is one of the reactants taken from the air. It is consumed in the fuel cell reaction. There might be some unreacted oxygen exiting the system, but it is a reactant, not a waste emission product in the same way water is.
- Water: As discussed, water (\(\text{H}_2\text{O}\)) is the primary and practically only significant tailpipe emission produced by the chemical reaction in a hydrogen fuel cell. This fits the description of "no tailpipe emissions other than" perfectly, meaning water is the only thing coming out.
Based on the working principle of hydrogen fuel cells and the options provided, water is the substance emitted from the tailpipe as a direct product of the energy generation process, making FCEVs a zero-emission alternative to vehicles burning fossil fuels.
Revision Table: FCEV Inputs and Outputs
| Input | Process in Fuel Cell | Output/Emission |
|---|---|---|
| Hydrogen (\(\text{H}_2\)) | Consumed at anode | Not applicable (reactant) |
| Oxygen (\(\text{O}_2\)) from air | Consumed at cathode | Not applicable (reactant) |
| Nitrogen (\(\text{N}_2\)) from air | Passes through | Expelled (not a product) |
| Chemical reaction produces electricity and heat | Electricity, Heat | |
| Reaction product formed | Water (\(\text{H}_2\text{O}\)) | |
| Water vapour/liquid (tailpipe emission) |
Additional Information: Green Hydrogen and FCEVs
- Green Hydrogen: This refers to hydrogen produced using renewable energy sources (like solar or wind power) to electrolyze water. This process splits water (\(\text{H}_2\text{O}\)) into hydrogen (\(\text{H}_2\)) and oxygen (\(\text{O}_2\)). When this green hydrogen is used in an FCEV, the entire energy chain, from production to use, can be very low-carbon.
- Zero Tailpipe Emissions: Unlike internal combustion engine vehicles that emit pollutants like carbon dioxide, nitrogen oxides, and particulate matter, FCEVs emit only water. This contributes significantly to improving air quality in urban areas.
- Applications: FCEVs are being developed for various applications, including passenger cars, buses, trucks, trains, and even ships and aircraft. Their suitability for heavier vehicles and longer ranges is a key advantage over battery-electric vehicles in some cases.
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