{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T20:38:59Z","timestamp":1789159139000,"version":"build-2803163510"},"reference-count":61,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2023,6,6]],"date-time":"2023-06-06T00:00:00Z","timestamp":1686009600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100015498","name":"Ministry for Innovation and Technology","doi-asserted-by":"publisher","award":["TKP2021-NKTA-21"],"award-info":[{"award-number":["TKP2021-NKTA-21"]}],"id":[{"id":"10.13039\/501100015498","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100015498","name":"Ministry for Innovation and Technology","doi-asserted-by":"publisher","award":["TKP2021-NKTA-05"],"award-info":[{"award-number":["TKP2021-NKTA-05"]}],"id":[{"id":"10.13039\/501100015498","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Nowadays, the study of environmentally friendly ways of producing hydrogen as a green energy source is an increasingly important challenge. One of these potential processes is the heterogeneous photocatalytic splitting of water or other hydrogen sources such as H2S or its alkaline solution. The most common catalysts used for H2 production from Na2S solution are the CdS-ZnS type catalysts, whose efficiency can be further enhanced by Ni-modification. In this work, the surface of Cd0.5Zn0.5S composite was modified with Ni(II) compound for photocatalytic H2 generation. Besides two conventional methods, impregnation was also applied, which is a simple but unconventional modification technique for the CdS-type catalysts. Among the catalysts modified with 1% Ni(II), the impregnation method resulted in the highest activity, for which a quantum efficiency of 15.8% was achieved by using a 415 nm LED and Na2S-Na2SO3 sacrificial solution. This corresponded to an outstanding rate of 170 mmol H2\/h\/g under the given experimental conditions. The catalysts were characterized by DRS, XRD, TEM, STEM-EDS, and XPS analyses, which confirmed that Ni(II) is mainly present as Ni(OH)2 on the surface of the CdS-ZnS composite. The observations from the illumination experiments indicated that Ni(OH)2 was oxidized during the reaction, and that it therefore played a hole-trapping role.<\/jats:p>","DOI":"10.3390\/ijms24129802","type":"journal-article","created":{"date-parts":[[2023,6,6]],"date-time":"2023-06-06T13:42:06Z","timestamp":1686058926000},"page":"9802","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Photocatalytic H2 Production by Visible Light on Cd0.5Zn0.5S Photocatalysts Modified with Ni(OH)2 by Impregnation Method"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-1048-4563","authenticated-orcid":false,"given":"Bence","family":"P\u00e1ll","sequence":"first","affiliation":[{"name":"Research Group of Environmental and Inorganic Photochemistry, Center for Natural Sciences, Faculty of Engineering, University of Pannonia, P.O. Box 1158, H-8210 Veszpr\u00e9m, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maali-Amel","family":"Mersel","sequence":"additional","affiliation":[{"name":"Research Group of Environmental and Inorganic Photochemistry, Center for Natural Sciences, Faculty of Engineering, University of Pannonia, P.O. Box 1158, H-8210 Veszpr\u00e9m, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P\u00e9ter","family":"Pekker","sequence":"additional","affiliation":[{"name":"Environmental Mineralogy Research Group, Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, P.O. Box 1158, H-8210 Veszpr\u00e9m, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00c9va","family":"Mak\u00f3","sequence":"additional","affiliation":[{"name":"Department of Materials Engineering, Research Center for Engineering Sciences, University of Pannonia, P.O. Box 1158, H-8210 Veszpr\u00e9m, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Veronika","family":"V\u00e1gv\u00f6lgyi","sequence":"additional","affiliation":[{"name":"Research Group of Analytical Chemistry, Center for Natural Sciences, Faculty of Engineering, University of Pannonia, P.O. Box 1158, H-8210 Veszpr\u00e9m, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mikl\u00f3s","family":"N\u00e9meth","sequence":"additional","affiliation":[{"name":"Surface Chemistry and Catalysis Department, Centre for Energy Research, Hungarian Academy of Sciences, Konkoly-Thege Street 29-33, H-1121 Budapest, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00f3zsef S\u00e1ndor","family":"Pap","sequence":"additional","affiliation":[{"name":"Surface Chemistry and Catalysis Department, Centre for Energy Research, Hungarian Academy of Sciences, Konkoly-Thege Street 29-33, H-1121 Budapest, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1215-6980","authenticated-orcid":false,"given":"Lajos","family":"Fodor","sequence":"additional","affiliation":[{"name":"Research Group of Environmental and Inorganic Photochemistry, Center for Natural Sciences, Faculty of Engineering, University of Pannonia, P.O. Box 1158, H-8210 Veszpr\u00e9m, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5325-8430","authenticated-orcid":false,"given":"Ott\u00f3","family":"Horv\u00e1th","sequence":"additional","affiliation":[{"name":"Research Group of Environmental and Inorganic Photochemistry, Center for Natural Sciences, Faculty of Engineering, University of Pannonia, P.O. Box 1158, H-8210 Veszpr\u00e9m, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1016\/j.cattod.2007.01.042","article-title":"Photocatalysis for new energy production","volume":"122","author":"Matsuoka","year":"2007","journal-title":"Catal. Today"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Zhang, Y., Heo, Y.-J., Lee, J.-W., Lee, J.-H., Bajgai, J., Lee, K.-J., and Park, S.-J. (2018). 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