Zhang R H, Hu S M, Zhang X T, Wang Y
Open Research Laboratory of Geochemical Kinetics, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Baiwanzhuang Road 26, Beijing 100037, PR China.
Anal Chem. 2008 Nov 15;80(22):8807-13. doi: 10.1021/ac800948x. Epub 2008 Oct 15.
Gold as a hydrogen-sensing electrode for in situ measurement of dissolved H2 in aqueous solutions under extreme conditions is reported. The dissolved H2 sensor, constructed with a Au-based sensing element and coupled with a YSZ/HgO/Hg electrode, is well suited for determining dissolved H2 concentrations of aqueous fluids at elevated temperatures and pressures. The Au electrode is made of Au wire mounted in a quartz bar, which can be pressurized and heated in the high-pressure and -temperature conditions. The Au-YSZ sensor has been tested for its potential response to the concentrations of dissolved H2 in fluids by using a flow-through reactor at high temperatures up to 400 degrees C and pressures to 38 MPa. Good sensitivity and linear response between the hydrogen concentrations in the fluids and the H2 sensor potentials are reported for hydrogen gas in the concentration range of 0.1-0.001 M H2 in aqueous fluids at temperatures up to 340 degrees C and 30 MPa. Nernstian response of the cell potential to dissolved H2 in fluids was determined at 340 degrees C and 30 MPa, described as follows: DeltaE = 0.9444 + 0. 0603 log m H2 The experimental results indicate that the Au-YSZ/HgO/Hg cell can be used to measure the solubility of H2 in aqueous fluid at temperatures and pressures near to the critical state of water. Thus, this type of Au hydrogen sensor could be easily used for in situ measurement of H2 in hydrothermal fluids in a high-pressure vessel, or at midocean ridge, due to its structure of compression resistance.
据报道，金作为一种氢传感电极，可用于在极端条件下原位测量水溶液中溶解的氢气。这种溶解氢传感器由金基传感元件构建，并与YSZ/HgO/Hg电极耦合，非常适合于测定高温高压下水溶液中溶解氢的浓度。金电极由安装在石英棒中的金线制成，可在高温高压条件下进行加压和加热。通过使用流通式反应器，在高达400℃的高温和38MPa的压力下，对金-YSZ传感器对流体中溶解氢浓度的电位响应进行了测试。在高达340℃和30MPa的温度和压力下，对于水溶液中浓度范围为0.1-0.001M H₂的氢气，报道了流体中氢浓度与H₂传感器电位之间具有良好的灵敏度和线性响应。在340℃和30MPa下测定了电池电位对流体中溶解氢的能斯特响应，描述如下：ΔE = 0.9444 + 0.0603 log m H₂ 实验结果表明，金-YSZ/HgO/Hg电池可用于测量接近水临界状态的温度和压力下氢气在水溶液中的溶解度。因此，由于其抗压结构，这种类型的金氢传感器可轻松用于高压容器或洋中脊热液流体中氢气的原位测量。
