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Spontaneous polarization-driven charge migration in BaTiO3/Co3O4/C for enhanced catalytic performance
CrystEngComm ( IF 2.6 ) Pub Date : 2023-06-29 , DOI: 10.1039/d3ce00547j Yan Wang 1 , Hua Li 1 , Bin Cui 2 , Fei Pei 3 , Yaping Li 1 , Rui Zhao 1 , Jie Zhang 1 , Furong Wang 1 , Zixuan Gao 1 , Shan Wang 1
CrystEngComm ( IF 2.6 ) Pub Date : 2023-06-29 , DOI: 10.1039/d3ce00547j Yan Wang 1 , Hua Li 1 , Bin Cui 2 , Fei Pei 3 , Yaping Li 1 , Rui Zhao 1 , Jie Zhang 1 , Furong Wang 1 , Zixuan Gao 1 , Shan Wang 1
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Ferroelectric spontaneous polarization is a common physical phenomenon that stems from the displacement of positive and negative charges in opposite directions within ferroelectric materials. Herein, ferroelectric BaTiO3/Co3O4/C materials were prepared and ferroelectric spontaneous polarization was used to successfully drive the efficient transfer of intrinsic free charges. This led to the acceleration of the Co3+/Co2+ cycle and enhancement of peroxymonosulfate (PMS) activation efficiency. The catalytic activity of as-obtained BaTiO3/Co3O4/C initially increased and then quickly decreased with the increase in the concentration of the triblock polymer (P123), with the best catalytic activity achieved at a P123 concentration of 4 g L−1. The degradation rate constant of the BaTiO3/Co3O4/C + PMS system was 5.6 times and 68 times higher than those of the BaTiO3/Co3O4 + PMS system and Co3O4 + PMS system, respectively. This was ascribed to the synergy of ferroelectric spontaneous polarization and C-induced electron transfer. Complete degradation of methylene blue was achieved within 8 min in the BaTiO3/Co3O4/C + PMS system, and the main active species were holes (h+), SO4˙−, and 1O2. Moreover, spontaneous polarization played an important role in this catalytic process. This study provides a novel strategy to enhance the Co3+/Co2+ cycling process for promoting PMS activation.
中文翻译：
BaTiO3/Co3O4/C 中自发极化驱动的电荷迁移可增强催化性能
铁电自发极化是一种常见的物理现象，源于铁电材料内正电荷和负电荷沿相反方向的位移。在此，制备了铁电BaTiO 3 /Co 3 O 4 /C材料，并利用铁电自发极化成功地驱动了本征自由电荷的有效转移。这导致Co 3+ /Co 2+循环的加速和过一硫酸盐（PMS）活化效率的提高。所得BaTiO 3 /Co 3 O 4的催化活性随着三嵌段聚合物(P123)浓度的增加，/C先增大后迅速减小，其中P123浓度为4 g L -1时催化活性最佳。BaTiO 3 /Co 3 O 4 /C + PMS 体系的降解速率常数分别是BaTiO 3 /Co 3 O 4 + PMS 体系和Co 3 O 4 + PMS 体系的5.6 倍和68 倍。这归因于铁电自发极化和碳诱导电子转移的协同作用。BaTiO 3 /Co 3中亚甲基蓝在 8 分钟内完全降解O 4 /C + PMS体系，主要活性物种为空穴(h + )、SO 4 ˙ -和1 O 2。此外，自发极化在该催化过程中发挥了重要作用。本研究提供了一种增强Co 3+ /Co 2+循环过程以促进PMS激活的新策略。
更新日期：2023-06-29
中文翻译：
BaTiO3/Co3O4/C 中自发极化驱动的电荷迁移可增强催化性能
铁电自发极化是一种常见的物理现象，源于铁电材料内正电荷和负电荷沿相反方向的位移。在此，制备了铁电BaTiO 3 /Co 3 O 4 /C材料，并利用铁电自发极化成功地驱动了本征自由电荷的有效转移。这导致Co 3+ /Co 2+循环的加速和过一硫酸盐（PMS）活化效率的提高。所得BaTiO 3 /Co 3 O 4的催化活性随着三嵌段聚合物(P123)浓度的增加，/C先增大后迅速减小，其中P123浓度为4 g L -1时催化活性最佳。BaTiO 3 /Co 3 O 4 /C + PMS 体系的降解速率常数分别是BaTiO 3 /Co 3 O 4 + PMS 体系和Co 3 O 4 + PMS 体系的5.6 倍和68 倍。这归因于铁电自发极化和碳诱导电子转移的协同作用。BaTiO 3 /Co 3中亚甲基蓝在 8 分钟内完全降解O 4 /C + PMS体系，主要活性物种为空穴(h + )、SO 4 ˙ -和1 O 2。此外，自发极化在该催化过程中发挥了重要作用。本研究提供了一种增强Co 3+ /Co 2+循环过程以促进PMS激活的新策略。
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