Attenuating a metal–oxygen bond of a double perovskite oxide via anion doping to enhance its catalytic activity for the oxygen reduction reaction,Journal of Materials Chemistry A

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Attenuating a metal–oxygen bond of a double perovskite oxide via anion doping to enhance its catalytic activity for the oxygen reduction reaction
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-25 , DOI: 10.1039/d0ta04820h
Lihong Zhang _{1,

2,

3,

4,

5} , Wang Sun _{1,

2,

3,

4,

5} , Chunming Xu _{1,

2,

3,

4,

5} , Rongzheng Ren _{1,

2,

3,

4,

5} , Xiaoxia Yang _{1,

2,

3,

4,

5} , Jinshuo Qiao _{1,

2,

3,

4,

5} , Zhenhua Wang _{1,

2,

3,

4,

5} , Kening Sun _{1,

2,

3,

4,

5}

Affiliation

Elevating the sluggish oxygen reduction reaction (ORR) activity of the cathode material is crucial to the development and widespread application of intermediate-temperature solid oxide fuel cells (IT-SOFCs). Herein, a novel SOFC cathode, with superior ORR activity, is designed by incorporating F anions at O-sites of a double perovskite oxide (Sr₂Fe_1.5Mo_0.5O_6−δ, SFM). The resulting F-doped SFM cathode (Sr₂Fe_1.5Mo_0.5O_6−x−δF_x, SFMF, x = 0, 0.1, 0.2 and 0.3) exhibits improved crystal structure symmetry and enhanced electrocatalytic activity for the ORR. At 800 °C, the polarization resistance of F-doped SFM is significantly decreased to 0.072 Ω cm², which can be ascribed to the enhanced oxygen reduction capacity. Moreover, F-doping reduces the metal–oxygen bond energy and accelerates the transportation of O-ions during the electrochemical process, resulting in significantly enhanced ORR activity.

中文翻译：

通过阴离子掺杂减弱钙钛矿双氧化物的金属-氧键，以增强其对氧还原反应的催化活性

提高阴极材料的缓慢的氧还原反应（ORR）活性对于中温固体氧化物燃料电池（IT-SOFC）的开发和广泛应用至关重要。在此，通过在双钙钛矿氧化物（Sr ₂ Fe _1.5 Mo _0.5 O _{6- δ}，SFM）的O部位掺入F阴离子，设计出具有优异ORR活性的新型SOFC阴极。将所得的F掺杂的SFM阴极的（Sr ₂的Fe _1.5沫_0.5 ø _{6- X - δ} ˚F _X，SFMF，X= 0、0.1、0.2和0.3）对ORR表现出改善的晶体结构对称性和增强的电催化活性。在800°C下，掺F的SFM的极化电阻显着降低至0.072Ωcm ²，这可以归因于增强的氧还原能力。此外，F掺杂降低了电化学过程中的金属-氧键能，并加速了O离子的运输，从而显着增强了ORR活性。

更新日期：2020-07-21

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