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Quantum confined one-dimensional lepidocrocite titanate catalyst for superior electrocatalytic oxygen evolution performance
Journal article   Open access   Peer reviewed

Quantum confined one-dimensional lepidocrocite titanate catalyst for superior electrocatalytic oxygen evolution performance

Devraj Singh, Mohamed A. Ibrahim, Aidan McMoil, G. Schwenk, Joshua Snyder and Michel W. Barsoum
Chemical engineering journal (Lausanne, Switzerland : 1996), v 533, 174482
01 Apr 2026
DOI: https://doi.org/10.1016/j.cej.2026.174482
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url
https://doi.org/10.1016/j.cej.2026.174482View
Published, Version of Record (VoR)Open Access via Drexel Libraries Read and Publish Program 2026CC BY V4.0,  Open

Abstract

Intercalated one-dimensional lepidocrocite (1DL) titanate structures have emerged as promising platforms for diverse applications due to their extreme specific surface areas, structural versatility and functional tunability. We recently developed a highly scalable, inexpensive and simple technique to synthesize quantum confined 1DL titanate nanofilaments, NFs. X-ray diffraction, density functional theory, and transmission electron microscopy analyses revealed that the building blocks are 1D NFs with cross-sectional dimensions of ≈ 5 × 7 Å. These NFs stack along [020] and grow along the [100] direction. Herein, we demonstrate that the oxygen evolution reaction (OER) performance can be significantly enhanced through the incorporation of cobalt and iron cations via intercalation. One of the resulting compositions, co-doped with Co and Fe in a 70:30 molar ratio displayed an ultralow overpotential of 251 mV at a current density of 10 mA cm−2. Long-term durability tests on this electrode (100 h at 10 mA/cm2, and 150 h at 500 mA/cm2) indicated that the electrocatalyst was highly stable, exhibiting minimal degradation. Post-stability analysis revealed that the material remains on the electrode surface with uniform distribution and compositions. This work provides a new avenue for the development of efficient 1DL-based electrocatalysts through transition metal cation intercalation to enhance the OER activity.

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