TY - JOUR
T1 - Analysis of the regenerative H2S poisoning mechanism in Ce 0.8Sm0.2O2-coated Ni/YSZ anodes for intermediate temperature solid oxide fuel cells
AU - Yun, Jeong Woo
AU - Yoon, Sung Pil
AU - Park, Sanggyun
AU - Kim, Hee Su
AU - Nam, Suk Woo
N1 - Funding Information:
This Research was supported by “National Research Foundation of Korea Grant funded by the Korean Government (MEST)" ( NRF-2009-C1AAA001-0092944 ) and “the Global Research Laboratory Program funded by the Ministry of Education, Science and Technology of Korea ”.
PY - 2011/1
Y1 - 2011/1
N2 - Ceria is used as a sulfur sorbent due to its high affinity for sulfide at high temperatures. In addition, the ionic conductivity of ceria can be dramatically increased by doping with rare metals, including lanthanum, samarium, and gadolinium. Therefore, to enhance sulfur tolerance and improve anode performance, we modified an Ni-based anode with a thin layer coating of Sm0.2Ce0.8O2-δ (SDC) on the pore wall surface of an Ni/YSZ anode. The anode-supported cells were tested with varying H2S concentrations (0-100 ppm) at 600 and 700 °C. The cell performance was improved in the ceria- (by 20%) and in the SDC- (by 50%) modified anode by extending the additional TPB area in the anode. Under varying H2S exposure, the polarization resistance was reduced by ceria and the SDC coating on the anode pore wall surface, which led to improved cell performance. A porous SDC layer on the Ni/YSZ anode pore wall acted as a sulfur sorbent as well as an additional TPB area. Otherwise, ceria mainly acted as a sulfur sorbent at high concentrations of H2S (>60 ppm).
AB - Ceria is used as a sulfur sorbent due to its high affinity for sulfide at high temperatures. In addition, the ionic conductivity of ceria can be dramatically increased by doping with rare metals, including lanthanum, samarium, and gadolinium. Therefore, to enhance sulfur tolerance and improve anode performance, we modified an Ni-based anode with a thin layer coating of Sm0.2Ce0.8O2-δ (SDC) on the pore wall surface of an Ni/YSZ anode. The anode-supported cells were tested with varying H2S concentrations (0-100 ppm) at 600 and 700 °C. The cell performance was improved in the ceria- (by 20%) and in the SDC- (by 50%) modified anode by extending the additional TPB area in the anode. Under varying H2S exposure, the polarization resistance was reduced by ceria and the SDC coating on the anode pore wall surface, which led to improved cell performance. A porous SDC layer on the Ni/YSZ anode pore wall acted as a sulfur sorbent as well as an additional TPB area. Otherwise, ceria mainly acted as a sulfur sorbent at high concentrations of H2S (>60 ppm).
KW - Ceria
KW - Hydrogen sulfide
KW - Intermediate temperature solid oxide fuel cell
KW - Samarium-doped ceria
KW - Sulfur poisoning
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U2 - 10.1016/j.ijhydene.2010.10.060
DO - 10.1016/j.ijhydene.2010.10.060
M3 - Article
AN - SCOPUS:79251637135
VL - 36
SP - 787
EP - 796
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 1
ER -