Advancing OER catalysis with transition metals-doped LDH: a scalable 3D nanostructured catalyst for sustainable and high- performance energy technologies Rajini Murugesan 1 , Sengeni Anantharaj 2 and Maruthapillai Arthanareeswari 1* 1 Laboratory for Electrocatalysis and Energy (LEE), Department of Chemistry, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603 203, India, 2 Laboratory for Electrocatalysis and Energy (LEE), Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208 016, India *Email: arthanam@srmist.edu.in The global transition to renewable energy hinges on breakthroughs in catalysis for the oxygen evolution reaction (OER), a bottleneck in fuel cell and water-splitting technologies. The 3D nanostructured Mn-doped CoFe-LDH catalyst merges high-performance engineering with next-generation material design. By leveraging the synergistic effects of Mn doping within the CoFe-LDH framework, this self-supported catalyst achieves a quantum leap in OER efficiency. The strategically tailored 3D architecture amplifies active surface areas and facilitates seamless electron transport, while Mn incorporation fine-tunes the electronic structure, unlocking new catalytic pathways. Synthesized through an accessible hydrothermal approach, the material redefines scalability in catalyst production. The Mn-doped CoFe-LDH delivers industry-leading performance, with an impressively low overpotential of 255 mV at 20 mA cm-², combined with enduring stability over 24 hours of rigorous operation in alkaline media. This remarkable performance not only rivals state-of-the-art alternatives but also offers a sustainable, cost-effective solution tailored for real-world energy applications. Our findings bridge the gap between material innovation and practical implementation, setting a benchmark for OER catalysis in the era of clean energy. The Mn-doped CoFe-LDH isn’t just a catalyst, it’s a vision for the future of sustainable energy technologies. Keywords: Elecrocatalysis; Fuel cells; Layered Double Hydroxides (LDH); Oxygen Evolution Reaction (OER). References 1. Dionigi, Fabio, et al. "In-situ structure and catalytic mechanism of NiFe and CoFe layered double hydroxides during oxygen evolution." Nature communications 11.1 (2020): 2522. 2. Zhu, Keyu, et al. "Etching-doping sedimentation equilibrium strategy: Accelerating kinetics on hollow Rh-doped CoFe- layered double hydroxides for water splitting." Advanced Functional Materials 30.35 (2020): 2003556.
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