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Metal swarf can serve as a textured support for electrodes in alkaline water electrolysis—but it does not produce hydrogen simply by being placed in water. In a 2024 laboratory study, researchers deposited platinum on titanium swarf for hydrogen production and cobalt on nickel swarf for oxygen production, then tested the paired electrodes in an electrolyser. The results are promising, but they do not establish commercial-scale production.
How machining waste becomes an electrode
Metal swarf is the curled or fragmented material left over from machining. In the 2024 study by Thangamuthu and co-authors, discarded stainless-steel, titanium and nickel alloy swarf was examined as a possible electrode support. The researchers reported naturally formed surface grooves about 10–50 nm wide. They deposited platinum (Pt) or cobalt (Co) onto the swarf, using its nanotextured surface to hold the catalyst.
The process is part of alkaline water electrolysis: electricity drives a reaction that splits water into hydrogen and oxygen. The swarf provides the electrode’s supporting structure; the deposited catalyst and the surrounding electrochemical conditions determine its role. The paper describes modifying waste-metal surfaces by atomic deposition of Pt and Co. The study appeared in the Journal of Materials Chemistry A in 2024.
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Which swarf and catalyst did the researchers pair?
The team found that the substrate and catalyst pairing mattered. Their selected hydrogen-evolution electrode used Pt on titanium swarf, while the oxygen-evolution electrode used Co on nickel swarf.
#1 Best Overall
- 1. Electrical part: motor with wind shoulder, ammeter, voltmeter.
- 2. Ammonia fuel cell.Hydrogen's electrons travel from the anode to the cathode through an external circuit, generating an electric current. At the cathode, the electrons, protons, and oxygen in the air combine to produce water, which is the main by-product of the fuel cell.
- 3. PEM (proton exchange) water electrolyzer.Gaseous hydrogen is sent to the anode of the membrane, and air is sent to the cathode. The hydrogen atoms are stripped of electrons on the anode side, and the positively charged protons pass through the membrane to reach the cathode. In order for this reaction to occur, a platinum catalyst must be used.
- 4. The two proton exchange membrane electrodes in the organic base and the presenter are 35mm*35mm. Experimental steps. Add deionized water to the water level in the PEM water electrolyzer. The amount of water should not be too much to prevent water from flowing into the battery. After adding water, connect the hydrogen gas outlet on the water electrolyzer to the hydrogen gas inlet on the electrical energy with a gas pipe.
- 5.Then connect the 6V-12V DC power supply to the positive and negative wiring of the water electrolyzer part, and connect the transportation line of the electrical part to the electric energy after 2-3 minutes, the small motor starts to work, and the current is displayed on the current and voltmeter. Positive value.
| Electrode pairing | Role in electrolysis | Reported catalyst loading and structure |
|---|---|---|
| Pt on titanium swarf | Hydrogen evolution | Optimal reported loading: 28 μg cm−2; Pt nanoparticles 5–20 nm across in the grooves. |
| Co on nickel swarf | Oxygen evolution | Reported loading: 30 μg cm−2; roughly 100 nm interlinked Co(OH)2 flakes. |
These are optimized values and structures reported for the materials and experimental conditions in this study, not universal recipes for all swarf or electrolyser designs.
What performance did the full electrolyser report?
The researchers combined the Pt–Ti and Co–Ni electrodes in a full-cell alkaline electrolyser. Under the paper’s test conditions, they reported a current density of 40 mA cm−2 at 1.6 V versus the reversible hydrogen electrode (RHE), hydrogen and oxygen production rates of 22.09 and 10.75 mmol min−1, respectively, and 100% faradaic efficiency. They also reported no observed activity decrease during a 24-hour test. These are results reported by the study’s authors, not independently reproduced measurements or commercial-system specifications.
Rank #2
- 1. Electrical part: motor with wind shoulder, ammeter, voltmeter.
- 2. Ammonia fuel cell.Hydrogen's electrons travel from the anode to the cathode through an external circuit, generating an electric current. At the cathode, the electrons, protons, and oxygen in the air combine to produce water, which is the main by-product of the fuel cell.
- 3. PEM (proton exchange) water electrolyzer.Gaseous hydrogen is sent to the anode of the membrane, and air is sent to the cathode. The hydrogen atoms are stripped of electrons on the anode side, and the positively charged protons pass through the membrane to reach the cathode. In order for this reaction to occur, a platinum catalyst must be used.
- 4. The two proton exchange membrane electrodes in the organic base and the presenter are 35mm*35mm. Experimental steps. Add deionized water to the water level in the PEM water electrolyzer. The amount of water should not be too much to prevent water from flowing into the battery. After adding water, connect the hydrogen gas outlet on the water electrolyzer to the hydrogen gas inlet on the electrical energy with a gas pipe.
- 5.Then connect the 6V-12V DC power supply to the positive and negative wiring of the water electrolyzer part, and connect the transportation line of the electrical part to the electric energy after 2-3 minutes, the small motor starts to work, and the current is displayed on the current and voltmeter. Positive value.
The paper also compared the Pt loading on its Ti-swarf electrode with Pt/C commercial catalysts cited in the article: 0.028 mg cm−2 versus 0.1–0.6 mg cm−2. That is a comparison of catalyst loading only; it is not a full cost, lifecycle or environmental-impact analysis.
What the study establishes—and what it does not
The work demonstrates a laboratory approach to turning machining waste into electrode materials and testing them in alkaline water electrolysis. It identifies nanotextured swarf as a potential catalyst support and reports promising Pt–Ti and Co–Ni pairings under the authors’ conditions. The results do not show that the method is already affordable at industrial scale, commercially available, or proven for long-term operation: the reported stability observation lasted 24 hours.
Rank #3
- PEM electrolysis technology, pure water electrolysis, non-corrosive.
- Hydrogen and oxygen separation, safe and reliable, service life up to 6 years (20,000 hours) or more.
- Strict sealing process, producing high-concentration hydrogen with sufficient output.
- Uses 115/117 proton exchange membrane, loaded with iridium and platinum, which are superior materials.
The authors frame the approach as a way to address metal-waste recycling and affordable hydrogen production together. Their findings support that as a research opportunity, not as evidence that a commercially viable process has been achieved. The University of Nottingham repository record describes the same study.
Quick Recap
Best Value
- 1. Electrical part: motor with wind shoulder, ammeter, voltmeter.
- 2. Ammonia fuel cell.Hydrogen's electrons travel from the anode to the cathode through an external circuit, generating an electric current. At the cathode, the electrons, protons, and oxygen in the air combine to produce water, which is the main by-product of the fuel cell.
- 3. PEM (proton exchange) water electrolyzer.Gaseous hydrogen is sent to the anode of the membrane, and air is sent to the cathode. The hydrogen atoms are stripped of electrons on the anode side, and the positively charged protons pass through the membrane to reach the cathode. In order for this reaction to occur, a platinum catalyst must be used.
- 4. The two proton exchange membrane electrodes in the organic base and the presenter are 35mm*35mm. Experimental steps. Add deionized water to the water level in the PEM water electrolyzer. The amount of water should not be too much to prevent water from flowing into the battery. After adding water, connect the hydrogen gas outlet on the water electrolyzer to the hydrogen gas inlet on the electrical energy with a gas pipe.
- 5.Then connect the 6V-12V DC power supply to the positive and negative wiring of the water electrolyzer part, and connect the transportation line of the electrical part to the electric energy after 2-3 minutes, the small motor starts to work, and the current is displayed on the current and voltmeter. Positive value.
Rank #4
- Hydrogen fuel cell experimenter type I fuel cell PEM water electrolyzer
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