当前位置: X-MOL 学术Mater. Today Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Tailoring the ions and bandgaps in a novel semi-ionic energy conversion device for electrochemical performance
Materials Today Energy ( IF 9.3 ) Pub Date : 2020-09-24 , DOI: 10.1016/j.mtener.2020.100536
M. Zahra , Rizwan Raza , A. Ali , N. Mushtaq , M.A. Ahmad , I. Shakir , Q. Abbas , M. Akbar

The new semi-ionic energy conversion (SIEC) device has attracted remarkable attention owing to its clean and environmentally friendly applications. In this device, novel materials and mechanisms have been explored using electronic and ionic conductor materials. The tuning effect of the ions and bandgap has been studied to investigate the structural, optical, and electrochemical performance of the material. Composite materials, gadolinium-doped ceria-cadmium-doped ZnO (GDC-ZnCdO), based on ionic gadolinium-doped ceria (GDC) and semiconductor (ZnCdO) in molar ratios of 1:4, 2:3, 3:2, and 4:1 have been prepared by a wet chemical route. The crystalline structure of the GDC-ZnCdO was studied and found to have cubic and hexagonal wurtzite phases with an average crystallite size of 30–40 nm. The morphology of the prepared composite materials is a homogenous and porous structure. It was found that the addition of GDC increases the transmittance and shows a red shift in the bandgap from 2.70 eV to 2.46 eV. The maximum conductivity of 2.0 S/cm1 was achieved for the sample 4GDC-1ZnCdO at 700°C. Electrochemical impedance spectra and X-ray photoelectron spectroscopy analysis were performed to investigate the electrochemical properties of the prepared semi-ionic composite materials. The SIEC device showed a much better performance than a conventional solid oxide fuel cell. The maximum open-circuit voltage (OCV) of about 1.013 Vand power density of 0.65 W/cm2 were obtained using hydrogen fuel at 600°C, as compared with a conventional fuel cell with 0.72 V and 0.27 W/cm2, respectively. Hence, the results reveal that the ions and bandgap tuning play a crucial role in fuel cell functions. Therefore, it has been determined that the bandgap can be tuned to obtain a better and more stable performance of the SIEC device. This study presents a novel approach to enhance the electrochemical performance with the tailoring of the new semi-ionic materials.



中文翻译:

在新型半离子能量转换装置中定制离子和带隙以实现电化学性能

新型半离子能量转换(SIEC)装置因其清洁和环保的应用而引起了人们的极大关注。在该装置中,已经使用电子和离子导体材料探索了新颖的材料和机理。已经研究了离子和带隙的调谐效应,以研究材料的结构,光学和电化学性能。基于离子,掺杂的二氧化铈(GDC)和半导体(ZnCdO)的摩尔比为1:4、2:3、3:2和3的g掺杂二氧化铈-镉掺杂的ZnO(GDC-ZnCdO)的复合材料。 4:1是通过湿化学路线制备的。对GDC-ZnCdO的晶体结构进行了研究,发现其具有立方和六方纤锌矿相,平均晶粒尺寸为30-40 nm。制备的复合材料的形态是均匀且多孔的结构。发现添加GDC增加了透射率并且在带隙中显示出从2.70eV到2.46eV的红移。最大电导率2.0 S / cm在700°C下样品4GDC-1ZnCdO达到1。进行了电化学阻抗谱和X射线光电子能谱分析,以研究所制备的半离子复合材料的电化学性能。与传统的固体氧化物燃料电池相比,SIEC器件的性能要好得多。与具有0.72 V和0.27 W / cm 2的常规燃料电池相比,使用氢燃料在600°C下可获得约1.013 V的最大开路电压(OCV)和0.65 W / cm 2的功率密度, 分别。因此,结果表明离子和带隙调谐在燃料电池功能中起着至关重要的作用。因此,已经确定可以调节带隙以获得SIEC设备的更好和更稳定的性能。这项研究提出了一种通过定制新型半离子材料来增强电化学性能的新颖方法。

更新日期:2020-10-29
down
wechat
bug