페로브스카이트 구조를 갖는 Sr0.92Y0.08Ti1-xVxO3-δ (SYTV)는 고체산화물 연료 전지(Solid oxide fuel cell, SOFC)에서 H2S를 포함하는 연료를 사용하기 위한 대체 연료극으로 연구되었다. Sr0.92Y0.08TiO3-δ (SYT)의 전기화학적 성능을 향상시키기 위해 페로브스카이트의 B-사이트에 위치한 티타늄을 바나듐으로 치환하였다. 페치니법을 통해 합성된 SYTV는 작동 온도 조건에서 추가적인 부산물의 형성 없이 YSZ(yttria-stabilized zirconia) 전해질과 화학적으로 안정했다. 바나듐의 치환량이 증가함에 따라 산소 공공 결함(Oxygen vacancy)이 증가하였으며, 생성된 산소 공공 결함으로 인해 연료극의 이온 전도도가 증가했다. 전지 성능은 850 °C 순수한 H2 연료 조건에서 바나듐 치환 정도에 따라 1 mol.%의 바나듐이 치환된 경우 19.30 mW/cm2 이고 7 mol.%의 바나듐이 치환된 경우 34.87 mW/cm2이다. 1000 ppm의 H2S를 포함하는 H2 연료조건에서 cell의 최대 전력밀도는 1 mol.%의 경우 22.34 mW/cm2이고 7 mol.%의 경우 73.11 mW/cm2로 증가하였다.

Sr0.92Y0.08Ti1-xVxO3-δ (SYTV) with perovskite structure was investigated as an alternative anode to utilize H2S containing fuels in solid oxide fuel cells. To improve the electrochemical performance of Sr0.92Y0.08TiO3-δ (SYT), vanadium(V) was substituted to titanium(Ti) at the B-site of the SYT perovskites. The SYTV synthesized by the Pechini method was chemically compatible with the YSZ electrolyte without additional by-products formation under the cell fabricating conditions. As increasing V substitution amounts, the oxygen vacancies increased, resulting to increasing ionic conductivity of the anode. The cell performance in pure H2 at 850 °C is 19.30 mW/cm² and 34.87 mW/cm2 for a 1 mol.% and 7 mol.% of V substituted anodes, respectively. The cell performance using H2 fuel containing 1000 ppm of H2S at 850 °C was 23.37 mW/cm² and 73.11 mW/cm2 for a 1 mol.% and 7 mol.% of V substituted anodes, respectively.

Solid oxide fuel cells Hydrogen sulfide Sr0.92Y0.08Ti1-xVxO3-δ Vanadium substitution Alternative anode

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