{"id":20455,"date":"2026-02-24T06:17:28","date_gmt":"2026-02-24T05:17:28","guid":{"rendered":"https:\/\/www.icpf.cas.cz\/?p=20455"},"modified":"2026-02-24T06:23:43","modified_gmt":"2026-02-24T05:23:43","slug":"electrochemical-deposition-of-ni-co-oxides-vs-low-temperature-hollow-cathode-plasma-jet-sputtering-on-stainless-steel-meshes-physicochemical-properties-and-activity-in-volatile-organic-compounds-oxi","status":"publish","type":"post","link":"https:\/\/www.icpf.cas.cz\/en\/electrochemical-deposition-of-ni-co-oxides-vs-low-temperature-hollow-cathode-plasma-jet-sputtering-on-stainless-steel-meshes-physicochemical-properties-and-activity-in-volatile-organic-compounds-oxi\/","title":{"rendered":"Electrochemical deposition of Ni-Co oxides vs. low-temperature hollow cathode plasma jet sputtering on stainless steel meshes: Physicochemical properties and activity in volatile organic compounds oxidation"},"content":{"rendered":"

Volatile organic compounds in the air are a health problem for the human population. Air oxidation in the presence of catalysts is successfully used to remove them. Precious metal-based catalysts are successfully replaced by transition metal oxide-based catalysts. Reducing the cost of catalysts can be achieved through new preparation processes that minimize the amount of catalyst required.<\/p>\n

The study compares three methods for preparing nickel-cobalt oxide catalysts on stainless steel meshes for the oxidation of volatile organic compounds (VOC) such as ethanol and toluene: (i) electrochemical deposition followed by calcination in air, (ii) plasma jet sputtering using a hollow Ni-Co alloy cathode in an oxidation Ar+O\u2082 atmosphere, and (iii) a combination of both foregoing methods.\u00a0 Characterization of the catalysts confirmed the formation of Ni-Co spinel and NiO phases in all samples. Catalysts prepared by plasma jet sputtering exhibited higher catalytic activity, attributed to finer oxide particles, increased surface Co concentration, and a higher density of oxygen vacancies. Electrochemically deposited catalysts showed low activity due to the presence of larger oxide particles and a low surface area. The highest catalytic performance was achieved by plasma-sputtering Ni-Co oxide onto an electrochemically deposited oxide layer, combining the advantages of both methods. These results highlight the potential of plasma jet sputtering to produce highly active Ni-Co oxide catalysts with minimal active material loading.<\/p>\n

This study was conducted as part of the cooperation between the Research Group of Catalysis and Reaction Engineering<\/a> and the Research Group of Laser Chemistry<\/a> of the Institute of Chemical Process Fundamentals of the CAS, the Institute of Physics of the CAS, and the University of Chemistry and Technology in Prague.<\/p>\n

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