Hashemi, Negah Marks, Walker R. Civettini, Daniel R. Triana, Carlos A. Nandy, Subhajit Bikas, Rahman Notash, Behrouz Rameshbabu, Sharath Muller, Arnold Wichser, Adrian Vockenhuber, Christoph Bleiner, Davide Chae, Keun Hwa Patzke, Greta R. Najafpour, Mohammad Mahdi 2025-06-25T06:00:10Z 2025-06-25T06:00:10Z 2025-06-23 2025-06 0020-1669 https://pubs.kist.re.kr/handle/201004/152686 In this study, we examine the OER performance of a known cuboidal Co complex, ([CoII 4(dpy{OH}O)4(OAc)3(H2O)](ClO4)(1.7H2O) dpk = di(2-pyridyl) ketone, (complex 1)). Our experiments show that at a pH of 11, complex 1 acts as a precursor for the true oxygen-evolution reaction (OER) catalyst. During the OER process, nanoparticles composed of Co, O, N, and C form on the electrode surface. These nanoparticles were analyzed using a range of techniques, including energy-dispersive spectroscopy (EDX), scanning electron microscopy (SEM), X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), elastic recoil detection analysis, UV-visible spectroscopy (UV-vis), Raman spectroscopy, and electrochemical methods. XAS was utilized to confirm unequivocally the presence of CoO(OH) as the true catalyst under OER. Elastic recoil detection analysis (ERDA) detected a reduction in the overall N/Co ratio, indicating decomposition of the Co complex and ligand removal. Considering all the experimental data, it is proposed that the resulting nanoparticles are indeed CoO(OH) as the true OER catalysts, especially when combined with Fe impurities. This investigation offers a fresh perspective on the role of metal (hydr)oxide nanoparticles formed in the presence of multinuclear cobalt complexes during the OER process. English American Chemical Society A Cubane-Like Cobalt Complex in Water Oxidation: Synthesis, True Catalyst, and Catalytic Mechanism Article 10.1021/acs.inorgchem.5c01657 1 Inorganic Chemistry, v.64, no.24, pp.12264 - 12276 Inorganic Chemistry 64 24 12264 12276 N scie scopus 001505605200001 2-s2.0-105007903605 Chemistry, Inorganic & Nuclear Chemistry Article OXYGEN-EVOLUTION MANGANESE OXIDE NEUTRAL PH EFFICIENT HYDROGEN NICKEL METAL FILMS ELECTROCATALYSTS IDENTIFICATION