Grade by Grade
F. Electrochemistry · Electrochemistry

Fuel Cells, Electric Vehicles and Electrochemical Technologies

F1.1 F1.2 F3.5 A2.1 A2.2About 75 minutes
Learning goals
  • I can explain how a hydrogen fuel cell produces electricity and calculate its cell potential.
  • I can describe how an electric vehicle battery is built and explain its strengths and limits.
  • I can assess the viability of electrochemical technologies as alternative energy sources, using evidence.
  • I can analyse environmental, social and economic impacts of battery and fuel-cell technologies, including mining, manufacturing and recycling in Canada.

Words to know

fuel cell
A galvanic cell that is continuously supplied with fuel and oxidizing agent, so it produces electricity for as long as they are supplied.
proton-exchange membrane (PEM)
A polymer membrane that lets H⁺ ions pass from anode to cathode in a hydrogen fuel cell but blocks electrons and gases.
battery electric vehicle (BEV)
A vehicle powered only by a rechargeable battery and electric motor.
battery management system (BMS)
Electronics that monitor and control each cell's voltage, current and temperature in a battery pack.
green hydrogen
Hydrogen made by electrolysis of water using renewable or low-carbon electricity; "grey" hydrogen is made from natural gas without capturing the carbon dioxide.
critical minerals
Minerals such as lithium, nickel, cobalt and graphite that are essential to modern technologies and whose supply could be at risk.
life-cycle assessment
An analysis of a product's environmental impact from mining raw materials to manufacturing, use and disposal or recycling.

From the lab bench to the highway

Everything in this unit comes together here. A fuel cell is a galvanic cell that never runs out as long as you feed it. An electric car is a few thousand lithium-ion cells wired together. Hydrogen for fuel cells can be made by electrolysis. In this lesson you will use your chemistry to judge these technologies: what they do well, what they cost, and who is affected.

Hydrogen fuel cells

In a proton-exchange membrane (PEM) fuel cell, hydrogen gas is fed to the anode and oxygen (from air) to the cathode. A platinum catalyst speeds up both half-reactions.

  • Anode (oxidation): H₂ → 2H⁺ + 2e⁻ (E° = 0.00 V)
  • Cathode (reduction): O₂ + 4H⁺ + 4e⁻ → 2H₂O (E° = +1.23 V)
  • Overall: 2H₂ + O₂ → 2H₂O, E°cell = 1.23 − 0.00 = 1.23 V

The membrane carries H⁺ from anode to cathode; electrons travel through the external circuit. The only product at the point of use is water. Real cells deliver about 0.6 to 0.8 V each under load, so many are stacked in series.

Uses and viability (F1.1): fuel cells are used for backup power at telecommunication towers and hospitals, for remote sites, in forklifts in warehouses, and in some buses, trucks and trains. Canada has a long history in this field: Ballard Power Systems, in Burnaby, British Columbia, has developed PEM fuel cells since the 1980s.

The catch: almost all hydrogen today is grey hydrogen, made from natural gas, which releases carbon dioxide. Green hydrogen made by electrolysis of water with clean electricity (such as Ontario's largely nuclear and hydro grid) avoids this, but energy is lost at each step: electrolysis, compressing and storing the gas, and the fuel cell itself. Hydrogen also needs high-pressure tanks and a refuelling network.

ANODE (−)proton-exchange membraneCATHODE (+)H₂ → 2H⁺ + 2e⁻½O₂ + 2H⁺ + 2e⁻→ H₂OH₂ inO₂ inH₂O outH⁺loade⁻ →Overall: H₂ + ½O₂ → H₂OE°cell = 1.23 V
A proton-exchange membrane (PEM) fuel cell. Hydrogen is oxidized at the anode; H⁺ ions cross the membrane; electrons flow through the external load to the cathode, where oxygen is reduced to water.
Worked example

Example 1: Fuel-cell stack

A forklift's fuel-cell stack must supply 48 V. If each cell gives 0.70 V under load, how many cells are needed in series? What mass of hydrogen is consumed when the stack delivers a current of 100 A for 1.00 h?

  1. Cells: 48 ÷ 0.70 = 68.6, so 69 cells in series.
  2. Charge through the circuit: Q = It = 100 A × 3600 s = 3.60 × 10⁵ C; n(e⁻) = 3.60 × 10⁵ ÷ 96 485 = 3.731 mol.
  3. Each H₂ gives 2e⁻, so n(H₂) = 1.866 mol for each cell. In series, the same current passes through all 69 cells.
  4. Total: 69 × 1.866 mol × 2.02 g/mol = 260 g.

69 cells; about 260 g of hydrogen per hour.

Inside an electric-vehicle battery

A battery electric vehicle (BEV) stores its energy in a lithium-ion pack, typically about 50 to 100 kW·h. One cell gives only about 3.2 to 3.7 V, so cells are grouped into modules and modules into a pack of about 400 V (some newer cars use 800 V). A battery management system watches every cell's voltage and temperature, and a cooling or heating system keeps the cells in a safe range.

Cell chemistries differ mainly in the cathode:

  • NMC (lithium nickel manganese cobalt oxide): high energy density, longer range, but uses nickel and cobalt.
  • LFP (lithium iron phosphate): lower voltage and energy density, but cheaper, longer-lasting, more thermally stable and free of cobalt and nickel. LFP is now very common in standard-range cars and in grid storage.
  • Sodium-ion cells replace lithium with sodium, which is abundant and cheap. They store less energy per kilogram but cope well with cold. In February 2026, the Chinese battery maker CATL and car maker Changan unveiled a passenger car with CATL's Naxtra sodium-ion cells, which they described as the first mass-produced one, with sales planned from mid-2026.

Cold weather: in a Canadian winter, ion movement and reaction rates slow down (recall Energy Changes and Rates of Reaction), and energy is used to heat the cabin and battery, so range can drop noticeably. Heat pumps and battery pre-heating reduce the loss.

one cellabout 3.2–3.7 Va few A·h to~100 A·hmodulecells joined inseries and parallel,with sensorspack~400 V (or 800 V)50–100 kW·h+ cooling, BMSBuilding an electric-vehicle battery400 V ÷ 3.6 V per cell ≈ 111 cells (or groups of cells) in seriesBMS = battery management system: monitors each cell's voltage and temperature
An EV battery is built in levels: cells are joined into modules, and modules into a pack, managed by a battery management system (BMS).

Canada and Ontario in the battery supply chain

Ontario has become a centre for battery manufacturing:

  • NextStar Energy in Windsor (built as a Stellantis and LG Energy Solution joint venture; in February 2026 the partners announced that LG Energy Solution would buy Stellantis's share and become the sole owner) makes battery modules and cells for electric vehicles, and cells for energy storage. It held its grand opening in March 2026.
  • PowerCo (Volkswagen's battery company) is building a large cell plant in St. Thomas. In September 2026, the start of cell production was pushed back two years, to 2029, a reminder that EV markets and investment plans change quickly.
  • Recycling: Li-Cycle, founded in Ontario, developed processes to recover lithium, nickel and cobalt from used batteries. After financial difficulties, most of its business was bought by the mining company Glencore in 2025.

Critical minerals and First Nations: Northern Ontario's Ring of Fire region holds deposits of nickel, chromite and other minerals. Development requires roads through traditional territories, peatlands that store huge amounts of carbon, and watersheds. Some First Nations support road and mine development for jobs and services; others oppose it or insist on full consent and their own environmental assessments. Canada and Ontario have a legal duty to consult Indigenous peoples. Any honest assessment of EVs must include these voices.

Life-cycle view: making an EV, especially its battery, produces more greenhouse gas than making a gasoline car. Over its lifetime an EV usually comes out well ahead, and the advantage is largest where the electricity is clean, as it is in Ontario and Quebec.

Assessing a technology (F1.1)

Use evidence, not slogans. For any electrochemical technology, ask:

  1. Chemistry: What are the half-reactions? What voltage and energy density are possible?
  2. Efficiency: How much of the input energy reaches the wheels or the device?
  3. Materials: Which elements are needed? Where are they mined, and by whom?
  4. Environment: What are the emissions over the whole life cycle, including electricity sources?
  5. People: Who benefits, who bears the risks, and were affected communities consulted?
  6. End of life: Can it be safely reused or recycled?
Just for fun

A hydrogen car's only tailpipe emission is water. So technically, the most environmentally harmful thing it can do is splash you at a bus stop.

FeatureBattery EVHydrogen fuel-cell vehicle
Where the energy is storedlithium-ion batterycompressed hydrogen gas
Electricity to wheels (approx.)roughly 70–90% from the gridroughly 25–40% if hydrogen is made by electrolysis
Refuellingminutes to hours (home or fast charger)a few minutes, but very few stations in Canada
Tailpipe emissionsnonewater only
Main challengesbattery minerals, charging time, winter rangehydrogen production, storage, cost and infrastructure
Comparing battery and fuel-cell vehicles. Efficiencies are approximate ranges that vary by source and conditions.
Hands-on activity

Decision matrix: powering a remote site

A remote fly-in community or research station in northern Canada currently gets its electricity from diesel generators. You will compare options using a decision matrix.

  1. On paper, list four options: diesel generators (current), solar panels with lithium-ion (LFP) batteries, wind turbines with batteries, and a hydrogen fuel cell with hydrogen delivered or made on site by electrolysis.
  2. Choose five criteria, for example: reliability in winter, cost, greenhouse gas emissions, safety, and community control and jobs.
  3. Give each criterion a weight from 1 to 3 (how important it is). Score each option from 1 to 5 on each criterion. Multiply and total.
  4. For each score, write one sentence of evidence, using chemistry from this unit (cell potentials, cold-weather performance, electrolysis, efficiency).
  5. Discuss with a family member: would they weigh the criteria differently? Why?

What to look for: there is no single right answer. Strong work justifies each score with evidence and notes that real projects often combine options (for example, solar plus batteries with diesel as backup).

Your turn

1

Write the anode, cathode and overall reactions for a hydrogen fuel cell and calculate E°cell.

2

How is a fuel cell different from a battery?

3

What does the proton-exchange membrane do?

4

Distinguish grey hydrogen from green hydrogen.

5

Why is an EV battery pack made of many cells in series?

6

Give one advantage and one disadvantage of LFP cells compared with NMC cells.

7

Why does an EV's range drop in a Canadian winter?

More practice: warm-up

1

What is the only product of a hydrogen fuel cell at the point of use?

2

Which catalyst is commonly used in PEM fuel cells?

3

What does BMS stand for?

4

Name the region in northern Ontario with deposits of nickel and chromite.

5

Why is sodium attractive as a battery material?

More practice: on your own

1

Explain why a fuel-cell stack delivers less than 1.23 V per cell when it is running.

2

An EV pack is 400 V and stores 75 kW·h. What is its capacity in ampere-hours?

3

Why is the climate benefit of an EV larger in Ontario than in a region that burns coal for electricity?

4

Give two reasons recycling lithium-ion batteries matters.

5

Give one argument for and one concern about mining development in the Ring of Fire, as raised by different groups.

Challenge

1

Green hydrogen route: electrolysis is about 70% efficient, compression and storage keep about 90% of the energy, and the fuel cell is about 55% efficient. What fraction of the original electricity reaches the motor? Compare with a battery EV whose charge-and-discharge path is about 85% efficient.

2

How many litres of hydrogen gas at SATP (24.8 L/mol) must a single fuel cell consume to deliver 1.00 A for 1.00 h?

3

Explain why a fuel cell and the electrolysis of water are the reverse of one another, and use E° values to state the minimum voltage needed for electrolysis under standard conditions.

Check your understanding

Quiz

1.

What is the standard cell potential of a hydrogen–oxygen fuel cell?

2.

In a PEM fuel cell, what crosses the membrane?

3.

Which statement about hydrogen production is correct?

4.

Why are LFP cells widely used in standard-range EVs and grid storage?

5.

A 400 V EV pack is made of cells of about 3.6 V. About how many cells (or parallel groups) are in series?

6.

Which is the strongest evidence-based reason an EV's climate benefit is large in Ontario?

For parents and teachers

Big idea (F1.1, F1.2, F3.5): fuel cells and lithium-ion batteries apply the galvanic-cell chemistry of this unit. Judging them means looking at efficiency, materials, life-cycle emissions and the people affected, including First Nations near mineral deposits.

How to help: Ask your teen to explain your own car, a neighbour's EV or a hybrid using cells, modules and packs. Talk through the decision-matrix activity and share how you would weigh cost, reliability and environment.

Common difficulties:

  • Assuming fuel cells or EVs have zero environmental impact. Manufacturing, mining and electricity sources matter.
  • Thinking E°cell doubles when the equation is doubled. It does not.
  • Mixing up energy (kW·h) and power (kW), or capacity (A·h) and energy.

Note on currency: battery companies, plant schedules and government policies change often. Facts about specific companies are current to 2026; encourage your teen to check recent news before using them in an assignment.