具有减少的气体交换的Zirfon型多孔隔板的合成，用于碱性电解槽,International Journal of Energy Research

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具有减少的气体交换的Zirfon型多孔隔板的合成，用于碱性电解槽
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2019-12-10 , DOI: 10.1002/er.5038
Hae In Lee _{1,

2} , Dao Thi Dung ₁ , Jieun Kim ₁ , Jae Hun Pak ₁ , Sang kyung Kim _{1,

3} , Hyun Seok Cho ₁ , Won Chul Cho _{1,

2} , Chang Hee Kim _{1,

3}

Affiliation

可再生能源的迅速发展由于其间歇性和易变性，对平衡电网提出了巨大的挑战。不能使用或出售多余的能源，因此为了维持电网平衡，必须对其进行削减。多余的电能可以通过电转气技术转化为气态能量载体，即氢气。碱性水电解可以使用可再生能源大规模地动态运行。然而，当电解器在低的部分负荷或高压下运行时，穿过多孔分离器的气体穿越的风险迅速增加，导致效率损失和安全问题。商业多孔隔板Zirfon PERL，由85％（重量）的氧化锆纳米粒子和15％（重量）的聚砜组成，²。然而，由于其130nm的大的平均孔径，Zirfon PERL隔板表现出20×10 ^-12 mol cm ^-1 bar ^-1 bar ^-1 sec ^-1的高氢渗透率值，导致电解器的动态范围有限。因此，有必要开发一种减少气体交叉的多孔隔板。在这项研究中，我们通过流延法改变ZrO ₂的含量（75-85 wt。％）来合成多孔ZrO ₂ /聚砜复合材料隔板。的75重量％的ZrO ₂ /25重量％聚砜复合隔膜，它包含的ZrO低量的₂，示出了3.8巴，0.3Ωcm的低离子电阻的高泡点压力²，和被降低4.2×10的氢渗透性^-12摩尔厘米^-1巴^-1秒^-1与Zirfon PERL隔板的比较。该隔膜性能的提高归因于平均孔径减小了约70 nm，接触角为75°的高表面润湿性。该结果将有助于碱性电解系统作为更可控的负载运行。

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The synthesis of a Zirfon‐type porous separator with reduced gas crossover for alkaline electrolyzer

The rapid expansion of renewable energy sources presents a great challenge to balance the electric grid due to their intermittent and volatile nature. The surplus energy generation cannot be used or sold so that it is curtailed in order to maintain the grid balance. The excess power can be converted into a gaseous energy carrier, hydrogen via power‐to‐gas technology. Alkaline water electrolysis can be operated in a dynamic mode using renewable energy sources on a large scale. However, the risk of gas crossover across a porous separator rapidly increases when the electrolyzer operates at a low partial load or at high pressure, leading to efficiency loss and a safety issue. The commercial porous separator Zirfon PERL, which is composed of 85 wt.% zirconia nanoparticles and 15 wt.% polysulfone, exhibits a satisfactory bubble point pressure performance of approximately 2.5 bar and ionic resistance of 0.3 Ω cm². However, the Zirfon PERL separator exhibits a high hydrogen permeability value of 20 × 10⁻¹² mol cm⁻¹ bar⁻¹ sec⁻¹ due to its large average pore size of 130 nm, resulting in a limited dynamic range of the electrolyzer. Therefore, it is necessary to develop a porous separator with reduced gas crossover. In this study, we synthesize a porous ZrO₂/polysulfone composite separator by varying the amount of ZrO₂ (75‐85 wt.%) via the film‐casting method. The 75 wt.% ZrO₂/25 wt.% polysulfone composite separator, which contains a low amount of ZrO₂, shows a high bubble point pressure of 3.8 bar, a low ionic resistance of 0.3 Ω cm², and are reduced hydrogen permeability of 4.2 × 10⁻¹² mol cm⁻¹ bar⁻¹ sec⁻¹ compared with that of Zirfon PERL separator. The enhanced performance of this separator is attributed to the reduced average pore size of around 70 nm and high surface wettability with a contact angle of 75°. This result will help alkaline electrolyzer systems be operated as more controllable loads.

更新日期：2019-12-10

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