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CVB304 Chemistry Research Project

Question

Answered

Question:

2D Bimetallic Oxide Formation From Liquid Metals

Overview of the Experiment:

The idea was to try and create atomically thin bimetallic oxide sheets that can be used as catalysts to split water and create hydrogen. Basically, we want to alloy say Fe and Co into liquid Ga and expose it to an oxygen stream and eject nanosheets into solution. Then we collect, analyse and use as a catalyst. The liquid metal allows for easy detachment of the nanosheets due to low van der Waal forces and self-limiting oxide formation phenomena.

Note: Need help with plotting graphs and calculating OER and ORR onset potentials and E1/2.

Methodology:

Sample preparation

  • 1% Fe 0.1% Co in GaInSn

à Weigh out GaInSn (find the mass required of Co and Fe for 0.1%) and mix the sample well)

  • Transfer well mixed 0.5g sample to a microcentrifuge tubes  àadd 0.5mL HCl
  • O2 bubbling for 30 mins
  • Collect the liquid
  • Using GC electrode with Pt Ring
  • Drop cast 30micro litres onto the electrode

Nickel Foam

  • Dilute Nafion 1/10
  • Add 2% dil. Nafion to catalyst ink
  • Soak Ni foam in HCl for 1 min
  • Rinse with DI water
  • Soak Ni foam in catalyst ink for 5 mins
  • Dry in oven & run CV with stirred bar.

Experiments:

  1. Run CV with O2 purge 15 mins in NaOH @1500RPM
  2. With O2 purge run ORR CV section @1500RPM
  3. Run CV with O2 purge 15 mins in NaOH (@ DIFFERENT SCAN RATE) @1500RMP
  4. RRDE (GC with Pt Ring) hold at 0V and -0.6V (LSV)
  5. Ni foam experiment

OER and ORR analysis or 0.1%Co 0.1%Fe.

mV to V = +(0.059*12)+0.1976

to change current = /0.071 (surface area of the electrode)

For samples:

Surface area calculation

OER:

Ω @10 mAcm-2

Onset potential

Tafel slope

Onset potential calculations

E1/2 calculations

However 0.1 % Co 0.1% Fe is the best sample. So more details on that.

CVB304 Chemistry Research Project

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