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Gold as a hydrogen sensing electrode forin situ measurement of dissolved H2 in supercritical aqueous fluid

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Abstract

Potentiometric studies of the Au-YSZ(Hg/HgO) (YSZ=yttrium stabilized zirconia) cell were conducted to investigate the suitability of gold as a sensing element forin situ determination of dissolved H2 in aqueous fluids at 375–400°C and 400 bars. Experimental results indicate that the gold electrode responds rapidly and reversibly to variations in dissolved H2, even at H2<0.1 mmol-kg−1. Nernstian response of the cell to dissolved H2 was demonstrated at 400°C and 400 bars

$$\Delta E = 0.9815 + 0.0668 \log m_{H_2 } $$

In fact, the performance of the gold electrode compares well to that of platinum. Considering the well known difficulties of using platinoid metals in H2S-bearing fluids, however, the gold electrode holds great promise forin situ measurement of dissolved H2 in chemically complex natural hydrothermal fluids. The results also suggest that the Au-YSZ(Hg/HgO) cell can be used to determine the solubility behavior of H2 in aqueous fluid at temperatures and pressures in the vicinity of the critical point of water. At present, such data are lacking, which severely constrains knowledge of the effect of temperature and pressure on the Henry's law constant of H2 in water.

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Authors and Affiliations

  1. Department of Geology and Geophysics, University of Minnesota, 310 Pillsbury Drive SE, 55455, Minneapolis, Minnesota

    Kang Ding & William E. Seyfried Jr.

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  1. Kang Ding
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  2. William E. Seyfried Jr.
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Ding, K., Seyfried, W.E. Gold as a hydrogen sensing electrode forin situ measurement of dissolved H2 in supercritical aqueous fluid. J Solution Chem 25, 421–433 (1996). https://doi.org/10.1007/BF00972990

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