Role of Photorelaxation effect in stability and activity of K doped TiO2/NiFe-LDH Composites for oxygen evolution reaction

Zhiyi Zeng, Yue Chen, Xiangjun Yang, Shunhong Chen, Liu Yang, Xiaodong Zhu and Xiaoqiang Wu

Renewable Energy, 2025, vol. 248, issue C

Abstract: Photoassisted oxygen evolution catalyst (OER) is an emerging high-efficiency catalyst, and its catalytic efficiency will be greatly improved under the condition of light. An alkali metal K-doped TiO2/Ni4Fe6-LDH photoassisted OER catalyst was prepared using heterojunction and oxygen vacancy construction strategies. The results show that the lattice distortion caused by K atoms helps increase the oxygen vacancy and improve the mobility of oxygen atoms. The OER overpotential of K/TiO2/Ni4Fe6-LDH is 57 mV lower than that of Ni4Fe6-LDH under light, and its i-t discharge current platform at 1.72 V is 6.8 times higher. More importantly, K/TiO2/Ni4Fe6-LDH exhibited a "light relaxation" phenomenon during illumination. Its light activity continued to grow even after the light source was turned off, allowing it to operate efficiently for an additional 1.2 h. Further studies show that this light relaxation is closely linked to surface remodeling and a rapid increase in oxygen vacancies during illumination. This new discovery is significant for developing efficient OER catalysts and reducing energy consumption in green hydrogen production via electrolysis.

Keywords: Oxygen vacancy; Photoassisted OER; Heterostructures; TiO2 (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:248:y:2025:i:c:s0960148125007402

DOI: 10.1016/j.renene.2025.123078

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