Citation: Yuanhua Xiao, Jinhui Shou, Shiwei Zhang, Ya Shen, Junwei Liu, Dangcheng Su, Yang Kong, Xiaodong Jia, Qingxiang Yang, Shaoming Fang, Xuezhao Wang. Synergistic interlayer confinement and built-in electric field construct reconstruction-inhibited cobalt selenide for robust oxygen evolution at high current density[J]. Chinese Chemical Letters, ;2025, 36(11): 111441. doi: 10.1016/j.cclet.2025.111441 shu

Synergistic interlayer confinement and built-in electric field construct reconstruction-inhibited cobalt selenide for robust oxygen evolution at high current density

Yuanhua Xiao ^{a, *,} ,
Jinhui Shou ^a ,
Shiwei Zhang ^a ,
Ya Shen ^a ,
Junwei Liu ^a ,
Dangcheng Su ^{b, *,} ,
Yang Kong ^a ,
Xiaodong Jia ^a ,
Qingxiang Yang ^a ,
Shaoming Fang ^{a, *,} ,
Xuezhao Wang ^{c, *,}

a.
Key Laboratory of Surface & Interface Science and Technology, Zhengzhou University of Light Industry, Zhengzhou 450002, China
b.
Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium based Battery, School of Material Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China
c.
College of Chemical and Food, Zhengzhou University of Technology, Zhengzhou 450044, China

yuanhua_xiao@163.com

dangchengsu@foxmail.com

mingfang@zzuli.edu.cn

xzhwang126@126.com

Received Date: 27 January 2025
Revised Date: 5 June 2025
Accepted Date: 10 June 2025
Available Online: 11 June 2025

Figures(5)

Transition metal selenides (TMS) demonstrate exceptional catalytic activity in the oxygen evolution reaction (OER), yet their performance is hindered by surface reconstruction under OER conditions, particularly at high current densities. This study reveals that embedding Co_0.85Se nanoparticles into the interlayer spacing of MXene-Ti₃C₂ effectively suppresses surface reconstruction during OER. This configuration establishes a Schottky heterojunction with an intrinsic built-in electric field (BEF) between Co_0.85Se and Ti₃C₂, which enhances charge redistribution and accelerates electron transport. Consequently, the Co_0.85Se@Ti₃C₂ composite exhibits outstanding OER performance, achieving low overpotentials (230 mV at 100 mA/cm², 376 mV at 1000 mA/cm², 417 mV at 1500 mA/cm²) and exceptional durability (200 h at 200 mA/cm²). In-situ XRD/Raman characterization verifies that the encapsulated Co_0.85Se within Ti₃C₂ inhibits CoOOH formation on the surface during OER. Both experimental and theoretical investigations indicate that the heterojunction's superhydrophilicity/superaerophobicity, synergized with BEF-regulated oxygen intermediate adsorption/desorption, collectively enhance catalytic efficiency of Co_0.85Se@Ti₃C₂. This strategy of spatially confining chalcogenide catalysts to prevent structural degradation while leveraging interfacial electric fields presents a rational approach for developing durable electrocatalysts in high-current densities water electrolysis.
- Co_0.85Se,
- MXene,
- Prevent reconstruction,
- Built-in electric field,
- Oxygen evolution
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