Amorim Fernando M L, Crisafulli Rudy, Linares José J
Institute of Chemistry, Federal University of Goiás, Campus Samambaia, Avenida Esperança s/n, Goiania 74690-900, Brazil.
Institute of Chemistry, University of Brasilia, Campus Universitário Darcy Ribeiro, Brasilia 70910-900, Brazil.
Nanomaterials (Basel). 2022 Apr 12;12(8):1315. doi: 10.3390/nano12081315.
This study shows the results, for the first time, of an glycerol alkaline-acid electrolyzer. Such a configuration allows spontaneous operation, producing energy and hydrogen simultaneously as a result of the utilization of the neutralization and fuel chemical energy. The electroreformer-built with a 20 wt% Pd/C anode and cathode, and a Na-pretreated Nafion 117-can simultaneously produce hydrogen and electricity in the low current density region, whereas it operates in electrolysis mode at high current densities. In the spontaneous region, the maximum power densities range from 1.23 mW cm at 30 °C to 11.9 mW cm at 90 °C, with a concomitant H flux ranging from 0.0545 STP m m h at 30 °C to 0.201 STP m m h at 90 °C, due to the beneficial effect of the temperature on the performance. Furthermore, over a chronoamperometric test, the electroreformer shows a stable performance over 12 h. As a challenge, proton crossover from the cathode to the anode through the cation exchange Nafion partially reduces the pH gradient, responsible for the extra electromotive force, thus requiring a less permeable membrane.
本研究首次展示了甘油碱性 - 酸性电解槽的结果。这种配置允许自发运行，由于利用了中和和燃料化学能，可同时产生能量和氢气。该电改质器由20 wt%的钯碳阳极和阴极以及钠预处理的Nafion 117制成，在低电流密度区域可同时产生氢气和电力，而在高电流密度下以电解模式运行。在自发区域，最大功率密度范围从30°C时的1.23 mW/cm²到90°C时的11.9 mW/cm²，伴随的氢通量范围从30°C时的0.0545 STP m²/m²·h到90°C时的0.201 STP m²/m²·h，这是由于温度对性能的有益影响。此外，在计时电流测试中，该电改质器在12小时内表现出稳定的性能。作为一个挑战，质子通过阳离子交换Nafion从阴极渗透到阳极会部分降低pH梯度，而pH梯度是产生额外电动势的原因，因此需要使用渗透性更低的膜。
