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Nickel iron diselenide for highly efficient and selective electrocatalytic conversion of methanol to formate Li, Junshan Xing, Congcong Zhang, Yu Zhang, Ting Spadaro, Maria Chiara Wu, Qianbao Yi, Yunan He, Shenglan Llorca Piqué, Jordi Arbiol, Jordi Cabot, Andreu Cui, Chunhua Universitat Politècnica de Catalunya. Doctorat en Enginyeria de Processos Químics Universitat Politècnica de Catalunya. Departament d'Enginyeria Química Universitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia Àrees temàtiques de la UPC::Enginyeria química Àrees temàtiques de la UPC::Energies::Eficiència energètica Electrochemistry Metanol Electroquímica The electro-oxidation of methanol to formate is an interesting example of the potential use of renewable energies to add value to a biosourced chemical commodity. Additionally, methanol electro-oxidation can replace the sluggish oxygen evolution reaction when coupled to hydrogen evolution or to the electroreduction of other biomass-derived intermediates. But the cost-effective realization of these reaction schemes requires the development of efficient and low-cost electrocatalysts. Here, a noble metal-free catalyst, Ni1-xFexSe2 nanorods, with a high potential for an efficient and selective methanol conversion to formate is demonstrated. At its optimum composition, Ni0.75Fe0.25Se2, this diselenide is able to produce 0.47 mmol cm-2 h-1 of formate at 50 mA cm-2 with a Faradaic conversion efficiency of 99%. Additionally, this noble-metal-free catalyst is able to continuously work for over 50 000 s with a minimal loss of efficiency, delivering initial current densities above 50 mA cm-2 and 2.2 A mg-1 in a 1.0 m KOH electrolyte with 1.0 m methanol at 1.5 V versus reversible hydrogen electrode. This work demonstrates the highly efficient and selective methanol-to-formate conversion on Ni-based noble-metal-free catalysts, and more importantly it shows a very promising example to exploit the electrocatalytic conversion of biomass-derived chemicals. Peer Reviewed Postprint (author's final draft) 2021-02-01 Article Li, J. [et al.]. Nickel iron diselenide for highly efficient and selective electrocatalytic conversion of methanol to formate. "Small", 1 Febrer 2021, vol. 17, núm. 6, p. 2006623:1-2006623:11. 1613-6829 https://hdl.handle.net/2117/352755 10.1002/smll.202006623 eng https://onlinelibrary.wiley.com/doi/10.1002/smll.202006623 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain application/pdf