Overview and Current Status DEVELOPMENT OF TWO TYPES OF TUBULAR SOFCS AT TOTO

developed lOkW class tubular SOFC modules for stationary power generation using Japanese town gas (13A) as fuel. A small module which consisted of 5 stacks (a stack consisted of 2 x 6 cells) generated 1.5kW at 0.2Alcm2 and achieved 55%-LHV efficiency at an average temperature of 900°C. A thermally self-sustaining module consisting of 20 stacks achieved 6.5kW at 0.2A/cm2 and 50%-LHV. relatively lower temperatures. The single cell generated 0.85,0.70, and 0.24W/cm2 at 700"C, 600"C, and 500°C, respectively. We built and evaluated a stack consisting of 14 micro tubular cells, and it successfully demonstrated 43W. 37W and 28W at a temperature of 700°C, 600°C, and 500°C. respectively. INTRODUCTION TOTO is the top sanitary ware manufacturer in Japan and highly experienced in traditional and advanced ceramic products. Solid Oxide Fuel Cells (SOFCs) are mainly composed of ceramics, and our fabrication technology has been utilized to produce high performance SOFCs at a low cost. TOTO started the research and development of tubular type SOFCs in 1989. From 2001 to 2004, we successfully completed a lOkW class thermally self-sustaining module test in a New Energy and Industrial Technology Development Organization (NEDO) project'). Since 2004, TOTO started a new collaboration with Kyushu Electric Power Co., Inc. and Hitachi, Ltd. in a new NEDO project. We are developing a co-generation system by integration with the TOTO stack. On the other hand, TOTO also started the development of micro SOFCs using micro tubular cells (diameter is less than 5mm) from 2002 under another NEDO project. In this paper, we summarized the current status of two types of SOFCs R & D at TOTO, i.e. tubular SOFC for stationary power generation and micro tubular SOFC for portable power application.