Remarkably Low Oxygen Evolution Reaction Overpotentials using Two-Dimensional Ternary Vanadium Compounds

• Published in: Applied surface science 2023-03, Vol.614, p.156236, Article 156236
• Main Authors: Sial, Qadeer Akbar, Ali, Rana Basit, Waqas, Muhammad, Lee, Young-Jae, Kalanur, Shankara S., Seo, Hyungtak
• Format: Article
• Language: English
• Subjects: 2D structure; Electrolysis; Lead vanadate; Overpotential; Oxygen evolution reaction
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2022.156236

[Display omitted] •Hydrothermally obtained PbV spherical type morphology.•2D structure facilitate and enhances the active channel for electrolyte.•Available multiple states and active sites promotes the OER kinetics.•Excellent OER performance shown by PbV along with long stability. Lowering the overpotentials to drive the oxygen evolution reaction (OER) during the water-splitting process is the bottleneck process and holds the key to achieving cost-effective and efficient electrolysis infrastructure systems. Given this, here we report the first demonstration of utilizing a catalyst derived from lead vanadate (PVO) for alkaline electrolysis systems with record low overpotentials. The synthesis route was regulated to yield a two-dimensional (2-D) PVO structure with uniform coatings on the Ni electrode. The optimized PVO demonstrated impressively low overpotentials of 146 mV vs RHE for OER at a current density of 10 mAcm−2. The excellent OER performance was attributed to the 3D structures assembled from porous 2D PVO that promotes a facile ionic transport and accelerates electron transfer in OER electrochemical process. Importantly, the proposed approach will open a new window for possible exploitation and practical utilization of ternary vanadium oxides in alkaline electrolysis in the future.