Synergistic effect of sulfur atoms and ordered oxygen vacancies to enhance Fe 2 O 3 bifunctional electrocatalytic water splitting activity

作者：Kaining Shi, Shihao Ding, Xueli Zhang, Hengrui Jian, Chenlong Dong, Qianqian Shen, Luhao Yang, Jinbo Xue · 发表于：Journal of Advanced Ceramics · 年份：2025 · DOI：10.26599/jac.2025.9221157 · 被引用次数：18 · 研究领域：Electrocatalysts for Energy Conversion、Electrochemical Analysis and Applications、Advanced battery technologies research

Iron-based oxides are promising bifunctional electrocatalysts. The energy conversion efficiency for water splitting is limited by scarce active sites and sluggish surface reaction in Fe 2 O 3 . Therefore, we prepared one-dimensional Fe 2 O 3 nanobelts arrays (HNBs-V O (LRO)-S) with ordered oxygen vacancy structure by Pd-catalyzed oxygen reduction and sulfide thermal treatment. While preserving the ordered oxygen vacancy structure, making S atoms selectively fill the trap state oxygen vacancies to improve the bifunctional electrocatalytic activity and stability of Fe 2 O 3 . Fe 2 O 3 nanobelts arrays with synergistic interaction of S-atoms and ordered oxygen vacancies have low overpotentials for anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER). Under the condition of 1 M KOH, the HNBs-V O (LRO)-S exhibits extraordinary electrocatalytic performances for both HER (226 mV@100 mA cm -2 ) and OER (262 mV@10 mA cm -2 ，306 mV@100 mA cm -2 ). In addition, HNBs-V O (LRO)-S bifunctional catalyst only requires the low cell voltages of 1.92 V to deliver the current density of 100 mA cm -2 and exhibits excellent long-term durability over 100 h. The long-range ordered oxygen vacancies serve both as a fast channel for electron transfer and as an active site for the catalytic reaction. The S atoms only fill the trap-state oxygen vacancies (TS-V O ) in the Fe 2 O 3 nanobelts, which eliminates the negative effect of TS-V O in reaction. Meanwhile, formed...