Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space & Environment, Beihang University, Shahe Campus, Beijing 102206, China.
Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space & Environment, Beihang University, Shahe Campus, Beijing 102206, China.
Bioresour Technol. 2021 Oct;337:125352. doi: 10.1016/j.biortech.2021.125352. Epub 2021 Jun 2.
Preventing methane evolution is a key issue to guarantee stable hydrogen production in microbial electrolysis cell (MEC). In this study, low-cost hydrophilic porous materials, such as non-woven cloth (NWC) and polyvinylidenedifluoride (PVDF), were investigated as alternatives to proton exchange membrane (PEM) in MEC. The MEC with a NWC (NWC-MEC) improved the current density and hydrogen production rate (HPR) of 262.5±10 A m and 2.5±0.2 m m d, respectively, due to its lower pH gradient (0.37) and ion transport resistance (0.9±0.1 mΩ m). Hydrogen production in NWC-MEC (from 2.5 to 2.1 m m d) and PVDF-MEC (from 2.2 to 2.0 m m d) showed more stable performance compared to PEM-MECs (from 2.2 to 1.6 m m d) during 30 days of operation. Moreover, results of anodic microbial community analysis indicate that the growth of methanogens of NWC-MEC and PVDF-MEC was effectively inhibited in 30 days.
防止甲烷的产生是保证微生物电解池（MEC）稳定产氢的关键问题。在这项研究中，低成本的亲水多孔材料，如无纺布（NWC）和聚偏二氟乙烯（PVDF），被作为质子交换膜（PEM）的替代品在 MEC 中进行了研究。由于其较低的 pH 值梯度（0.37）和离子传输阻力（0.9±0.1 mΩ m），具有 NWC 的 MEC（NWC-MEC）提高了电流密度和氢气产率（HPR），分别为 262.5±10 A m 和 2.5±0.2 m m d。与 PEM-MEC 相比（从 2.2 降至 1.6 m m d），NWC-MEC（从 2.5 降至 2.1 m m d）和 PVDF-MEC（从 2.2 降至 2.0 m m d）的产氢性能在 30 天的运行中更加稳定。此外，阳极微生物群落分析的结果表明，在 30 天内，NWC-MEC 和 PVDF-MEC 中甲烷菌的生长得到了有效抑制。
