{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,7]],"date-time":"2026-02-07T13:16:12Z","timestamp":1770470172422,"version":"3.49.0"},"reference-count":77,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2025,10,2]],"date-time":"2025-10-02T00:00:00Z","timestamp":1759363200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"FCT\u2014Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia\u2014","award":["UIDB\/00285"],"award-info":[{"award-number":["UIDB\/00285"]}]},{"name":"FCT\u2014Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia\u2014","award":["LA\/P\/0112\/2020"],"award-info":[{"award-number":["LA\/P\/0112\/2020"]}]},{"name":"FEDER Funds","award":["LISBOA-01-0247-FEDER-039985\/POCI-01-0247-FEDER-039985"],"award-info":[{"award-number":["LISBOA-01-0247-FEDER-039985\/POCI-01-0247-FEDER-039985"]}]},{"name":"FEDER Funds","award":["LA\/P\/0037\/2020"],"award-info":[{"award-number":["LA\/P\/0037\/2020"]}]},{"name":"FEDER Funds","award":["UIDP\/50025\/2020"],"award-info":[{"award-number":["UIDP\/50025\/2020"]}]},{"name":"FEDER Funds","award":["UIDB\/50025\/2020"],"award-info":[{"award-number":["UIDB\/50025\/2020"]}]},{"name":"PRR\u2014Recovery and Resilience Plan"},{"name":"Next-Generation EU Funds"}],"content-domain":{"domain":["www.mdpi.com"],"crossmark-restriction":true},"short-container-title":["J. Compos. Sci."],"abstract":"<jats:p>Harnessing solar energy is crucial for applications such as water desalination through solar collectors, where efficient conversion of solar radiation into thermal energy is required. In this study, electroless nickel\u2013phosphorus (Ni-P) coatings and their carbon black (CB) nanoparticle composites were successfully deposited and evaluated as selective solar absorbers. The coatings exhibited compact, crack-free, and amorphous structures composed mainly of Ni(OH)2 and NiOOH, as confirmed by SEM-EDS, XRD, FTIR, and Raman analyses. Increasing the pH enhanced the deposition rate and coating thickness while reducing the phosphorus content. Incorporation of CB nanoparticles was confirmed, though it slightly decreased coating thickness. Optical characterization revealed high absorptance and low emissivity across all samples, with the Ni-P coating produced at higher pH (C1) achieving the best performance (brightness L* = 29.0; figure of merit \u03b1 \u2212 \u03b5 = 0.84). Aging tests further demonstrated the resilience of this sample, maintaining a figure of merit of 0.81. These findings establish Ni-P coatings, particularly at higher pH, as promising and safer alternatives to conventional chromium-based solar selective coatings.<\/jats:p>","DOI":"10.3390\/jcs9100535","type":"journal-article","created":{"date-parts":[[2025,10,2]],"date-time":"2025-10-02T08:20:28Z","timestamp":1759393228000},"page":"535","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Electroless Nickel Phosphorus Coatings for Enhanced Solar Absorption"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-8039-7541","authenticated-orcid":false,"given":"Gabriel","family":"Santos","sequence":"first","affiliation":[{"name":"CEMMPRE\u2014Centre for Mechanical Engineering, Materials and Processes, ARISE\u2014Advanced Production and Intelligent Systems, Department of Mechanical Engineering, University of Coimbra, Rua Lu\u00eds Reis Santos, 3030-788 Coimbra, Portugal"}]},{"given":"Diogo","family":"Cavaleiro","sequence":"additional","affiliation":[{"name":"CEMMPRE\u2014Centre for Mechanical Engineering, Materials and Processes, ARISE\u2014Advanced Production and Intelligent Systems, Department of Mechanical Engineering, University of Coimbra, Rua Lu\u00eds Reis Santos, 3030-788 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6216-3735","authenticated-orcid":false,"given":"S\u00edlvia","family":"Gavinho","sequence":"additional","affiliation":[{"name":"Physics Department, University of Aveiro, i3N, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3596-6588","authenticated-orcid":false,"given":"Zohra","family":"Benzarti","sequence":"additional","affiliation":[{"name":"CEMMPRE\u2014Centre for Mechanical Engineering, Materials and Processes, ARISE\u2014Advanced Production and Intelligent Systems, Department of Mechanical Engineering, University of Coimbra, Rua Lu\u00eds Reis Santos, 3030-788 Coimbra, Portugal"},{"name":"Laboratory of Multifunctional Materials and Applications (LaMMA), Department of Physics, Faculty of Sciences of Sfax, University of Sfax, Soukra Road km 3.5, B.P. 1171, Sfax 3000, Tunisia"}]},{"given":"Mariana","family":"Lopes","sequence":"additional","affiliation":[{"name":"SRAMPORT Lda., Rua Ant\u00f3nio S\u00e9rgio 15, 3025-041 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1890-1133","authenticated-orcid":false,"given":"Ant\u00f3nio","family":"Cunha","sequence":"additional","affiliation":[{"name":"Physics Department, University of Aveiro, i3N, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3643-4973","authenticated-orcid":false,"given":"Sandra","family":"Carvalho","sequence":"additional","affiliation":[{"name":"CEMMPRE\u2014Centre for Mechanical Engineering, Materials and Processes, ARISE\u2014Advanced Production and Intelligent Systems, Department of Mechanical Engineering, University of Coimbra, Rua Lu\u00eds Reis Santos, 3030-788 Coimbra, Portugal"},{"name":"Laboratory of Tests, Wear and Materials, IPN-LED & MAT-Instituto Pedro Nunes, Rua Pedro Nunes, 3030-199 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2217-4584","authenticated-orcid":false,"given":"Susana","family":"Devesa","sequence":"additional","affiliation":[{"name":"CEMMPRE\u2014Centre for Mechanical Engineering, Materials and Processes, ARISE\u2014Advanced Production and Intelligent Systems, Department of Mechanical Engineering, University of Coimbra, Rua Lu\u00eds Reis Santos, 3030-788 Coimbra, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,10,2]]},"reference":[{"key":"ref_1","unstructured":"NASA (2024, December 18). 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