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Investigation of the electrochemical performance of barium-based catalysts for intermediate temperature ammonia synthesis using zinc oxide doped proton conducting electrolyte
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.electacta.2024.145569
Saheli Biswas, Gurpreet Kaur, Sareh Vafakhah, Sarbjit Giddey, Jae Hyung Kim, Hyung Chul Yoon, Kyungho Lee
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.electacta.2024.145569
Saheli Biswas, Gurpreet Kaur, Sareh Vafakhah, Sarbjit Giddey, Jae Hyung Kim, Hyung Chul Yoon, Kyungho Lee
Ba and Ce doubly promoted Co catalysts (2BaCoCe0.05, 5BaCoCe0.05 and 5BaCoCe0.20) have been tested for electrochemical ammonia (NH3 ) synthesis in proton conducting solid oxide cells between 400 and 500 °C and atmospheric pressure, using 750 µm thick 1 mol% zinc oxide (ZnO) doped BaCe0.2 Zr0.7 Y0.1 O3−δ electrolyte and Ba-Ag-based composite electrodes. Faraday efficiency of proton conducting cell under all testing conditions was ∼ 89 %. NH3 production under open circuit conditions (OCV) was between 1.93 × 10–11 to 2.50 × 10–11 mol s-1 cm-2 that is a purely thermochemical phenomenon. Under bias, NH3 formation increased with the highest value of 5.80 × 10–11 mol s-1 cm-2 being recorded at 20 mA current. It was also observed that for all three catalysts, upon doubling the current, NH3 formation increased by ∼ four-fold, indicating electrochemical promotion of catalytic activity (EPOC). Swapping the anode gas from dry to humid H2 further increased the formation rate, yielding the highest value of 9.05 × 10–11 mol s-1 cm-2 at 20 mA current. In general, NH3 production (thermochemical) rates at OCV and 500 °C followed the order 2BaCoCe0.05>5BaCoCe0.20>5BaCoCe0.05 whereas electrochemical NH3 production rates under bias followed the order 5BaCoCe0.05>2BaCoCe0.05>5BaCoCe0.20. According to the literature, NH3 synthesis mechanisms are different for thermochemical and electrochemical pathways.
中文翻译:
氧化锌掺杂质子导电电解质中温合成氨的钡基催化剂的电化学性能研究
Ba 和 Ce 双促进 Co 催化剂(2BaCoCe0.05、5BaCoCe0.05 和 5BaCoCe0.20)已在 400 °C 和 500 °C 和大气压下的质子导电固体氧化物电池中使用 750 μm 厚的 1 mol% 氧化锌 (ZnO) 掺杂 BaCe0.2Zr0.7Y0.1O3−δ 电解质和 Ba-Ag 基复合电极进行了电化学氨 (NH3) 合成测试。在所有测试条件下,质子传导单元的法拉第效率约为 ∼ 89 %。开路条件下 (OCV) 下的 NH3 产生在 1.93 × 10-11 到 2.50 之间× 10-11 mol s-1cm-2,这是一种纯粹的热化学现象。在偏压下,NH3 形成增加,在 20 mA 电流下记录的最高值为 5.80 × 10–11 mol s-1cm-2。还观察到,对于所有三种催化剂,在电流加倍时,NH3 的形成增加了 ∼ 四倍,表明催化活性 (EPOC) 的电化学促进。将阳极气体从干燥的 H2 交换为潮湿的 H2 进一步提高了形成速率,在 20 mA 电流下产生 9.05 × 10–11 mol s-1cm-2 的最高值。一般来说,OCV 和 500 °C 时的 NH3 生成(热化学)速率遵循 2BaCoCe0.05>5BaCoCe0.20>5BaCoCe0.05 的顺序,而偏压下的电化学 NH3 生成速率遵循 5BaCoCe0.05>2BaCoCe0.05>5BaCoCe0.20 的顺序。根据文献,NH3 合成机制对于热化学和电化学途径不同。
更新日期:2025-01-23
中文翻译:
氧化锌掺杂质子导电电解质中温合成氨的钡基催化剂的电化学性能研究
Ba 和 Ce 双促进 Co 催化剂(2BaCoCe0.05、5BaCoCe0.05 和 5BaCoCe0.20)已在 400 °C 和 500 °C 和大气压下的质子导电固体氧化物电池中使用 750 μm 厚的 1 mol% 氧化锌 (ZnO) 掺杂 BaCe0.2Zr0.7Y0.1O3−δ 电解质和 Ba-Ag 基复合电极进行了电化学氨 (NH3) 合成测试。在所有测试条件下,质子传导单元的法拉第效率约为 ∼ 89 %。开路条件下 (OCV) 下的 NH3 产生在 1.93 × 10-11 到 2.50 之间× 10-11 mol s-1cm-2,这是一种纯粹的热化学现象。在偏压下,NH3 形成增加,在 20 mA 电流下记录的最高值为 5.80 × 10–11 mol s-1cm-2。还观察到,对于所有三种催化剂,在电流加倍时,NH3 的形成增加了 ∼ 四倍,表明催化活性 (EPOC) 的电化学促进。将阳极气体从干燥的 H2 交换为潮湿的 H2 进一步提高了形成速率,在 20 mA 电流下产生 9.05 × 10–11 mol s-1cm-2 的最高值。一般来说,OCV 和 500 °C 时的 NH3 生成(热化学)速率遵循 2BaCoCe0.05>5BaCoCe0.20>5BaCoCe0.05 的顺序,而偏压下的电化学 NH3 生成速率遵循 5BaCoCe0.05>2BaCoCe0.05>5BaCoCe0.20 的顺序。根据文献,NH3 合成机制对于热化学和电化学途径不同。