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Graphite/RGO coated paper μ-electrolyzers for production and separation of hydrogen and oxygen

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  • Rarotra, Saptak
  • Shahid, Shaik
  • De, Mahuya
  • Mandal, Tapas Kumar
  • Bandyopadhyay, Dipankar

Abstract

Microfluidic electrolyzers have been fabricated using graphite coated paper electrodes to electrolyze sea water into oxygen (O2) and hydrogen (H2) when integrated with a photovoltaic (PV) cell. The ‘open’ electrolyzer (OME) consists of a microchannel confined by a pair of graphite electrodes, which is drawn with the help of pencil tips. A sea water microdroplet has been dispensed at the junction of the electrodes while the PV cell is integrated to the electrodes to supply current. The microscale width of channel generates a high intensity electric field even at a lower potential, which facilitates the microdroplets to electrolyze into H2 and O2 near the cathode and anode. The rate of production of the gases increased with field intensity. In the ‘close’ electrolyzer (CME), the paper decorated with graphite electrodes is covered with a substrate embedded with polymeric microchannels. The microcapillaries are placed closer to the anode and cathode for in situ separation of H2 and O2. The economic, flexible, and metal-free micro-electrolyzer facilitates the water-splitting at a much lower applied voltage at an efficiency of 1–2%. Use of multiple separation channels in CME for production and separation of H2 and O2 shows the potential for micro-very-large-scale-integration (μ-VLSI).

Suggested Citation

  • Rarotra, Saptak & Shahid, Shaik & De, Mahuya & Mandal, Tapas Kumar & Bandyopadhyay, Dipankar, 2021. "Graphite/RGO coated paper μ-electrolyzers for production and separation of hydrogen and oxygen," Energy, Elsevier, vol. 228(C).
    • Handle: RePEc:eee:energy:v:228:y:2021:i:c:s0360544221007398
    DOI: 10.1016/j.energy.2021.120490
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    References listed on IDEAS

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