Hama Peshawa O, Aziz Shujahadeen B, Abdullah Omed Gh
Power and Control Engineering, Sulaimani Polytechnic University, Sulaymaniyah, 46001, Kurdistan Region, Iraq.
Research and Development Center, University of Sulaimani, Qlyasan Street, Sulaymaniyah, 46001, Kurdistan Region, Iraq.
Sci Rep. 2025 Aug 19;15(1):30475. doi: 10.1038/s41598-025-15193-4.
In the current study transparent solid ion conducting biopolymer blend electrolytes consisting of chitosan/cold water fish skin gelatin were prepared utilizing casting methodology. Ammonium thiocyanate (NHSCN) salt as a source of proton provider was added to the polymer blends. The ion conductor films were characterized by various methods including XRD, FTIR and EIS. The area under crystalline and amorphous peaks in the XRD patterns were determined and used to estimate the degree of crystallinity. The bands of FTIR pattern associated with anions of the added salt was deconvoluted to determine the fractions of free ions, ion aggregate and ion triplets. Comprehensive investigations of the electrical properties, including DC and AC conductivity, dielectric constant, dielectric loss and electric modulus, were studied to understand the ion conduction mechanism. The ion transport parameters obtained from both EIS and FTIR approach were in good agreement. The shift of peaks to higher frequencies in the loss tangent spectra indicated enhanced ion mobility at shorter time scales. The observation of relaxation peaks in the electric modulus (M'') spectra, which are absent in the dielectric loss (ε'') spectra, underscores the effectiveness of the modulus formalism in suppressing the contribution of electrode polarization and emphasizing bulk relaxation. AC conductivity spectra revealed three distinct conduction regimes, while the Argand plots provided insights into the ion relaxation dynamics within the current solid biopolymer electrolytes. The highest room-temperature ionic conductivity of 1.19 × 10 S/cm was achieved at 40 wt% NHSCN, attributed to the optimal balance between free ion concentration and polymer segmental mobility, as revealed by FTIR and EIS analyses.
在本研究中，采用流延法制备了由壳聚糖/冷水鱼皮明胶组成的透明固体离子导电生物聚合物共混电解质。向聚合物共混物中添加了作为质子供体来源的硫氰酸铵（NHSCN）盐。通过包括XRD、FTIR和EIS在内的多种方法对离子导体薄膜进行了表征。测定了XRD图谱中结晶峰和非晶峰下的面积，并用于估算结晶度。对与添加盐的阴离子相关的FTIR图谱带进行去卷积，以确定自由离子、离子聚集体和离子三重态的分数。对包括直流电导率和交流电导率、介电常数、介电损耗和电模量在内的电学性质进行了全面研究，以了解离子传导机制。从EIS和FTIR方法获得的离子传输参数吻合良好。损耗角正切谱中峰向更高频率的移动表明在更短时间尺度上离子迁移率增强。在电模量（M''）谱中观察到的弛豫峰（在介电损耗（ε''）谱中不存在）强调了模量形式在抑制电极极化贡献和突出本体弛豫方面的有效性。交流电导率谱揭示了三个不同的传导区域，而阿冈图提供了对当前固体生物聚合物电解质中离子弛豫动力学的见解。在40 wt% NHSCN时实现了最高室温离子电导率1.19×10 S/cm，这归因于FTIR和EIS分析所揭示的自由离子浓度与聚合物链段迁移率之间的最佳平衡。
