TY - JOUR
T1 - Enhancing coking tolerance of flat-tube solid oxide fuel cells for direct power generation with nearly-dry methanol
AU - Sang, Junkang
AU - Zhang, Yang
AU - Yang, Jun
AU - Wu, Tao
AU - Xiang, Luo
AU - Wang, Jianxin
AU - Guan, Wanbing
AU - Chai, Maorong
AU - Singhal, Subhash C.
N1 - Funding Information:
We gratefully acknowledge National Key R&D Program of China (No. 2021YFB2500402 ), National Natural Science Foundation of China ( U20A20251 , 11932005 ), Key R & D projects in Zhejiang Province ( 2021C01101 ), and Ningbo Major Special Projects of the Plan “Science and Technology Innovation 2025” ( 2019B10043 ).
Publisher Copyright:
© 2022
PY - 2023/2/1
Y1 - 2023/2/1
N2 - The state-of-the-art Ni/yttria-stabilized zirconia (YSZ) anodes in direct methanol solid oxide fuel cells (SOFCs) are vulnerable to carbon deposition. We propose two strategies to enhance coking tolerance of the cell, focusing on promoting the oxygen storage capacity of the Ni/YSZ anode and the methanol conversion in flat-tube SOFCs with an active area of 60 cm2. The Ni/YSZ anodes are decorated with nanosized gadolinia-doped ceria (GDC) by wet impregnation method and the fuel channels are filled with extra GDC-Ni/YSZ catalyst. Through these measures, carbon deposition in the modified cells is mitigated, and therefore the steam/carbon (S/C) ratio for successful long-term cell operation is significantly lowered, and the cell durability is improved. A GDC-Ni/YSZ cell with extra catalyst is operated for over 1200 h directly on methanol under low S/C ratios at 750 °C and carbon deposition is considerably suppressed. In addition, the degradation mechanism of the cell directly fueled with nearly-dry methanol (S/C = 0.1) is investigated. This work provides insight into efficient and durable SOFCs using biofuels, towards renewable energy conversion in large-scale commercial applications.
AB - The state-of-the-art Ni/yttria-stabilized zirconia (YSZ) anodes in direct methanol solid oxide fuel cells (SOFCs) are vulnerable to carbon deposition. We propose two strategies to enhance coking tolerance of the cell, focusing on promoting the oxygen storage capacity of the Ni/YSZ anode and the methanol conversion in flat-tube SOFCs with an active area of 60 cm2. The Ni/YSZ anodes are decorated with nanosized gadolinia-doped ceria (GDC) by wet impregnation method and the fuel channels are filled with extra GDC-Ni/YSZ catalyst. Through these measures, carbon deposition in the modified cells is mitigated, and therefore the steam/carbon (S/C) ratio for successful long-term cell operation is significantly lowered, and the cell durability is improved. A GDC-Ni/YSZ cell with extra catalyst is operated for over 1200 h directly on methanol under low S/C ratios at 750 °C and carbon deposition is considerably suppressed. In addition, the degradation mechanism of the cell directly fueled with nearly-dry methanol (S/C = 0.1) is investigated. This work provides insight into efficient and durable SOFCs using biofuels, towards renewable energy conversion in large-scale commercial applications.
KW - Carbon deposition
KW - Direct internal reforming
KW - Long-term durability
KW - Methanol
KW - Solid oxide fuel cell
UR - http://www.scopus.com/inward/record.url?scp=85146236588&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2022.232485
DO - 10.1016/j.jpowsour.2022.232485
M3 - Article
AN - SCOPUS:85146236588
SN - 0378-7753
VL - 556
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 232485
ER -
