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首页> 外文期刊>Electrochimica Acta >Solid-state photoelectrochemical H_2 generation with gaseous reactants
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Solid-state photoelectrochemical H_2 generation with gaseous reactants

机译：气态反应物产生固态光电化学H_2

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Photocurrent and H_2 production were demonstrated in an all solid-state photoelectrochemical cell employing gaseous methanol and water vapour at the photoanode. Open circuit photovoltage of around -0.4 V and short circuit photocurrent of up to 250 μA/cm~2 were obtained. At positive bias, photocurrent generation was limited by the irradiance, i.e., the amount of photogenerated charge carriers at the anode. Time constants and impedance spectra showed an electrochemical capacitance of the cell of about 15 μF/cm~2 in the dark, which increased with increasing irradiance. With only water vapour at the anode, the short circuit photocurrent was about 6% of the value with gaseous methanol and water vapour. The photoanode and electrocatalyst on carbon paper support were affixed to the proton conducting membrane using Nafion as adhesive, an approach that yielded photocurrents up to 15 times better than that of a cell assembled by hot-pressing, in spite of the overall cell resistance of the latter being up to five times less than that of the former. This is attributed, at least partially, to reactants being more readily available at the photoanode of the better performing cell.
机译：在全固态光电化学电池中证明了光电流和H_2的产生，该电池在光阳极使用气态甲醇和水蒸气。获得约-0.4 V的开路光电压和高达250μA/ cm〜2的短路光电流。在正偏压下，光电流的产生受到辐照度（即阳极处光生电荷载流子的数量）的限制。时间常数和阻抗谱显示电池在黑暗中的电化学电容约为15μF/ cm〜2，并随辐照度的增加而增加。在阳极只有水蒸气的情况下，短路光电流约为气态甲醇和水蒸气的6％。使用Nafion作为粘合剂，将碳纸载体上的光阳极和电催化剂固定在质子传导膜上，这种方法产生的光电流比通过热压组装的电池要高15倍，尽管后者比前者少五倍。这至少部分归因于在性能更好的电池的光电阳极处反应物更容易获得。

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