In overall iodine-sulphur (I-S) cycle (Bunsen reaction), HI decomposition is a serious challenge for improvement in H₂ production efficiency. Herein, we are reporting an electrochemical process for HI decomposition and simultaneous H₂ and I₂ production. Commercial Nafion 117 membrane has been generally utilized as a separator, which also showed huge water transport (electro-osmosis), and deterioration in conductivity due to dehydration. We report sulphonated poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) (SCP) and sulphonated graphene oxide (SGO) composite stable and efficient polymer electrolyte membrane (PEM) for HI electrolysis and H₂ production. Different SCP/SGO composite PEMs were prepared and extensively characterized for water content, ion-exchange capacity (IEC), conductivity, and stabilities (mechanical, chemical, and thermal) in comparison with commercial Nafion117 membrane. Most suitable optimized SCP/SGO-30 composite PEM exhibited 6.78 × 10⁻² S cm⁻¹ conductivity in comparison with 9.60 × 10⁻² S cm⁻¹ for Nafion® 117. The electro-osmotic flux ofSCP/SGO-30 composite PEM (2.53 × 10⁻⁴ cm s⁻¹) was also comparatively lower than Nafion® 117 membrane (2.75 × 10⁻⁴ cm s⁻¹). For HI electrolysis experiments, SCP/SGO-30 composite PEM showed good performance such as 93.4% current efficiency (η), and 0.043 kWh/mol-H₂ power consumption (Ψ). Further, intelligent architecture of SCP/SGO composite PEM, in which hydrophilic SGO was introduced between fluorinated polymer by strong hydrogen bonding, high efficiency and performance make them suitable candidate for electrochemical HI decomposition, and other diversified electrochemical processes.

在整个碘-硫（IS）循环（本森反应）中，HI分解是提高H ₂生产效率的严峻挑战。在此，我们报道了用于HI分解以及同时生产H ₂和I ₂的电化学过程。商业Nafion 117膜通常被用作隔膜，它也显示出巨大的水传输（电渗），并且由于脱水而导致电导率下降。我们报告了用于HI电解和H _2的磺化聚偏二氟乙烯-共六氟丙烯（PVDF-co-HFP）（SCP）和磺化氧化石墨烯（SGO）复合稳定高效的聚合物电解质膜（PEM）生产。与商用Nafion117膜相比，制备了不同的SCP / SGO复合PEM，并对其水含量，离子交换容量（IEC），电导率和稳定性（机械，化学和热稳定性）进行了广泛表征。与Nafion®117的9.60×10 ^-2  S cm ^-1比较，最合适的经过优化的SCP / SGO-30复合PEM表现出6.78×10 ^-2  S cm ^-1的电导率。SCP/ SGO-30复合PEM的电渗通量（2.53×10 ^-4  cm s ^-1）也比117膜（2.75×10 ^-4  cm s ^-1）低）。对于HI电解实验，SCP / SGO-30复合PEM表现出良好的性能，例如93.4％的电流效率（η）和0.043 kWh / mol-H _2的功耗（Ψ）。此外，SCP / SGO复合PEM的智能架构，其中通过强氢键将亲水性SGO引入氟化聚合物之间，高效和高性能使其成为电化学HI分解和其他多种电化学过程的合适候选者。