Kyoto University · 재료과학
마시키 모리타 교수의 연구실은 고온에서 안정적으로 작동하는 고체산화물 연료전지(SOFC)의 성능 향상과 내구성 향상을 목표로 하며, 특히 암모니아를 연료로 사용하는 SOFC 시스템의 기반 기술 개발에 주력하고 있습니다. FIB-SEM를 활용한 3차원 미세구조 분석과 수치 시뮬레이션을 융합하여, 다공성 양극의 전기화학적 반응 메커니즘과 물질 이동 거동을 정량적으로 규명하고 있습니다. 연구는 전극의 미세구조 설계, 촉매 개발, 내부 상태 분포 해석 등 다각도로 전개되어, 고효율·고내구성 연료전지의 실현을 위한 기초 및 응용 연구를 선도하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Abstract Power generation performance and long‐term durability of ammonia‐fueled solid oxide fuel cell (SOFC) systems are investigated with SOFC stacks consisting of 30 planar anode‐supported cells. SOFC systems with three different operation modes are employed: direct ammonia, external decomposition and autothermal decomposition. A novel BaO/Ni/Sm 2 O 3 /MgO catalyst is newly developed for the external ammonia cracker, whereas a Co‐Ce‐Zr composite oxide catalyst is used for the autothermal ammo
Three-dimensional numerical analysis of solid oxide fuel cell (SOFC) anode polarization is conducted with a microstructure obtained by a focused ion beam and scanning electron microscope (FIB-SEM). Electronic, ionic and gaseous transports with electrochemical reaction are considered in the porous anode. A sub-grid scale (SGS) model is newly developed and effectively used to consider the structural information whose characteristic scale is smaller than calculation grid size. The proposed SGS mode
Abstract Ni‐YSZ anode of solid oxide fuel cells (SOFCs) with three different compositions are examined and compared through electrochemical measurement, microstructural analysis, and numerical simulation. Three‐dimensional (3D) microstructure of the porous anodes is directly observed using focused ion beam and scanning electron microscope (FIB‐SEM), and microstructural parameters such as phase connectivity and three‐phase boundary (TPB) density are quantified to correlate the microstructure to t
Two-dimensional numerical model of an ammonia-fueled planar solid oxide fuel cell is developed to investigate the distributions of flow, temperature, species and electrochemical quantities within the cell. The model consists of the conservation equations of mass, momentum, energy, species and charge carriers, which are coupled by the electrochemical oxidation of hydrogen and the ammonia decomposition reaction. Comparison between the direct ammonia supply and pre-decomposed ammonia supply cases g
Active thickness in SOFC anodes is investigated by using one-dimensional numerical simulation. The effects of the operating conditions and the microstructural parameters of the porous anodes on the active thickness are systematically investigated. The non-linearity of the Butler-Volmer equation used for the electrochemical reaction model is found to be the key to explain the behaviour of the active thickness. The characteristic length of oxide-ion conduction is introduced by taking the ratio bet
Microstructural properties of an SOFC anode, such as tortuosity, surface-to-volume ratio and permeability, are quantitatively evaluated using three-dimensional data obtained by a system consisting of a focused ion beam and scanning electron microscope, FIB-SEM. A method employed to evaluate these properties is based on a random walk process in which the diffusion of imaginary particles is considered. In addition, the connectivities of three phases, i.e., the Ni, YSZ and pore phases are also anal
