Optimum dopant of barium zirconate electrolyte for manufacturing of protonic ceramic fuel cells

JOURNAL OF POWER SOURCES

卷:506

Article

Kuroha, Tomohiro^1,2  Niina, Yoshiki³  Shudo, Mizuki³  Sakai, Go³  Matsunaga, Naoki³  Goto, Takehito¹  Yamauchi, Kosuke¹  Mikami, Yuichi¹  Okuyama, Yuji^3,4 

[1] Panasonic Corp, Technol Div, 3-1-1 Yagumo Naka Machi, Moriguchi, Osaka 5708501, Japan

[2] Univ Miyazaki, Interdisciplinary Grad Sch Agr & Engn, 1-1 Gakuenkibanadai Nishi, Miyazaki 8892192, Japan

[3] Univ Miyazaki, Fac Engn, Dept Environm Robot, 1-1 Gakuenkibanadai Nishi, Miyazaki 8892192, Japan

[4] Univ Miyazaki, Fac Engn, Res Ctr Sustainable Energy & Environm Engn, 1-1 Gakuenkibanadai Nishi, Miyazaki 8892192, Japan

关键词: Proton conductor;    Fuel cell;    Proton concentration;    Yb-doped barium zirconate;   

DOI  :  10.1016/j.jpowsour.2021.230134

来源: Elsevier

【 摘 要 】

We examine ceramic tape-casting and anode electrolyte co-firing for large-scale manufacturing of protonic ceramic fuel cells. We confirm the reactivity of Ni, a commonly used anode, with BaZr0.8M0.2O3-delta (BZM20: M = Sc, In, Lu, Yb, Y or Gd). Addition of 0.4 mol% NiO to BZM20 and co-firing at 1778 K, produces BaM2NiO5 for M = Y and Gd. No reaction occurs for M = Sc, In, Lu and Yb. The proton conductivity of all BZM20s decreases by approximately 30% because of NiO doping and dehydration on dissolution NiO. Energy efficiency and power density calculations of the fuel cells based on measured proton and hole conductivities indicate respective decreases of approximately 10% and 75% ecause of the formation of a solid solution of NiO. We fabricate fuel cells by the tape-casting and anode electrolyte co-firing with BZM20 (M = Yb or Y). For M = Y, the cell cannot be fabricated because formation of BaY2NiO5 causes cell cracking. Conversely, when M = Yb, a cell with a maximum output of 0.5 Wcm- 2 at 873 K is fabricated. Hence, BZYb20 is a suitable material for tape-casting and anode electrolyte co-firing.

【 授权许可】

Free