Surface-doped perovskite electrolyte for low-temperature ceramic electrochemical cells

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-09-26 DOI:10.1016/j.ceramint.2024.09.318

Yuzheng Lu , M.A.K. Yousaf Shah , Muhammad Khalid , Naveed Mushtaq , Muhammad Yousaf , Nabeela Akbar

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Abstract

Protonic ceramic electrochemical cells (PCECs) can be employed for power generation and sustainable hydrogen production. Lowering the PCEC operating temperature to >500 °C can facilitate its scale-up and commercialization. However, achieving high energy efficiency and long-term durability at low operating temperatures is a long-standing challenge. Here, we report a simple and scalable approach for fabricating metal ion doping into perovskite (Li-doped SrTiO₃ (STO)) using the sol-gel approach and presented as a proton conducting electrolyte with lower ohmic and polarization resistance for low-temperature ceramic fuel cells. The prepared electrolyte with symmetrical electrodes attains high power densities in fuel-cell mode (∼0.65 W cm⁻² at 520 °C and ∼0.20 W cm⁻² at 420 °C) and exceptional current densities in steam electrolysis mode (−0.94 A cm⁻² at 1.4 V and 520 °C). Additionally, five-layer devices (Ni-NCAL/BCZYYb/Li-STO/BCZYYb/NCAL-Ni) demonstrate the proton fuel cell performance of 0.55 W cm⁻² at 520 °C.

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用于低温陶瓷电化学电池的表面掺杂过氧化物电解质

质子陶瓷电化学电池（PCEC）可用于发电和可持续制氢。将 PCEC 的工作温度降低到 500 °C 可以促进其规模化和商业化。然而，在低工作温度下实现高能效和长期耐用性是一项长期挑战。在此，我们报告了一种简单且可扩展的方法，即利用溶胶-凝胶法将金属离子掺杂到包晶体（锂掺杂的 SrTiO3 (STO)）中，并将其作为质子传导电解质，具有较低的欧姆电阻和极化电阻，可用于低温陶瓷燃料电池。制备的具有对称电极的电解质在燃料电池模式下可达到很高的功率密度（520 °C时∼0.65 W cm-2，420 °C时∼0.20 W cm-2），在蒸汽电解模式下可达到很高的电流密度（1.4 V、520 °C时-0.94 A cm-2）。此外，五层器件（Ni-NCAL/BCZYYb/Li-STO/BCZYb/NCAL-Ni）在 520 ℃ 时的质子燃料电池性能为 0.55 W cm-2。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.