A novel process of producing pure hydrogen from polyol electrolysis is presented in this study. First, polyols are oxidized by polyoxometalates (POMs) at elevated temperatures; the oxidized POMs then convert to reduced POMs after receiving electrons. The reduced POMs then lose electrons and convert to oxidized POMs at the anode in the electrolysis process. Protons from the polyols diffuse to the cathode and are reduced to H₂. In this process, POMs is utilized as both a catalyst and a charge carrier. The electric energy consumption is 1.755 kWh per normal cubic meter of H₂ (Nm^–3H₂) at 0.2 A cm^–2, which is approximately 42.5% of the energy consumed during water electrolysis. It is shown that the number and structure of hydroxyl groups influence hydrogen production significantly. The degree of reduction of POMs improves as the number of hydroxyl groups in fuel molecules increases. The higher degree of reduction of the POMs catalyst speeds up the reaction between POMs and the polyols. Preassociation between POMs and polyols was characterized by UV–vis and ¹H NMR spectroscopies.

中文翻译：

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使用多金属氧酸盐作为液体催化剂和电荷载体的多元醇电解生产纯氢

这项研究提出了一种从多元醇电解生产纯氢的新方法。首先，多元醇在高温下被多金属氧酸盐（POM）氧化；氧化的POM在接收电子后转变为还原的POM。然后，还原的POM在电解过程中在阳极处失去电子并转换为氧化的POM。来自多元醇的质子扩散到阴极并还原为H ₂。在此过程中，POM被用作催化剂和电荷载体。在0.2 A cm ^–2时，每标准立方米H ₂（Nm ^–3 H ₂）的电能消耗为1.755 kWh，约占水电解过程中消耗能量的42.5％。结果表明，羟基的数目和结构显着影响产氢。随着燃料分子中羟基数目的增加，POM的还原程度提高。POMs催化剂的较高还原度加快了POMs与多元醇之间的反应。POM和多元醇之间的预缔合通过UV-vis和¹ H NMR光谱进行表征。