Reconstruction of NiCu Hydroxide–Organic Frameworks into Active Oxyhydroxides Enables Industrial-Grade Seawater Electrolysis

Reconstruction of NiCu Hydroxide–Organic Frameworks into Active Oxyhydroxides Enables Industrial-Grade Seawater Electrolysis | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL Energy & Environmental Materials This is a preprint and has not been peer reviewed. Data may be preliminary. 13 May 2026 V1 Latest version Share on Reconstruction of NiCu Hydroxide–Organic Frameworks into Active Oxyhydroxides Enables Industrial-Grade Seawater Electrolysis Authors : Ngoc Quang Tran 0000-0002-3837-5110 [email protected] , Phuong Dung Ngoc Tran [email protected] , Trần-Phú Thành [email protected] , Thuy-Kieu Truong [email protected] , Thuy Tien Nguyen Tran [email protected] , Dai Truong Cao [email protected] , Jianmin Yu [email protected] , Hai Vothi [email protected] , Thi Anh Le [email protected] , Duy Quang Pham [email protected] , and Lishan Peng [email protected] Authors Info & Affiliations https://doi.org/10.22541/authorea.15003291/v1 20 views 20 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Efficient and durable electrocatalysts for direct seawater electrolysis are essential for sustainable hydrogen production but are limited by sluggish oxygen evolution kinetics and chloride-induced degradation. Here, we report a reconstruction-engineered catalyst based on bimetallic hydroxide-organic framework microbulk arrays, where controlled Cu incorporation (NiCu-MHOF-10, 10% Cu) modulates the electronic structure of Ni sites. The optimized NiCu-MHOF-10 achieves industrially relevant current densities of 1 A cm-2 at low overpotentials of 480, 430, and 492 mV in freshwater, simulated seawater, and natural seawater, respectively. In a two-electrode system, NiCu-MHOF-10 (+) // Pt/C (–) electrolyzer achieves 0.6 A cm-2 at 1.84 V (80 °C) with negligible decay over 200 h at 150 mA cm-2. Operando analyses reveal in situ reconstruction into high-valent γ-NiOOH as the true active phase. Cu incorporation accelerates intrinsic kinetics and stabilizes the oxyhydroxide phase against chloride corrosion, offering a viable strategy for industrial seawater electrolysis. Supplementary Material File (si.docx) si Download 2.15 MB Information & Authors Information Version history V1 Version 1 13 May 2026 Collection Energy & Environmental Materials Keywords electrochemistry energy materials materials science MOFs catalysts carbon materials catalysts energy materials solar cells carbon materials nanotechnology photovoltaics materials science Metal-hydroxide organic framework metal organic framework doping water splitting seawater electrolysis carbon materials catalysts energy materials energy materials semiconductors solar cells light emitting materials materials science electrochemistry energy materials materials science MOFs catalysts batteries carbon materials electrochemistry energy materials electrodes solar cells carbon materials nanotechnology photovoltaics materials science Authors Affiliations Ngoc Quang Tran 0000-0002-3837-5110 [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Phuong Dung Ngoc Tran [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Trần-Phú Thành [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Thuy-Kieu Truong [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Thuy Tien Nguyen Tran [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Dai Truong Cao [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Jianmin Yu [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Hai Vothi [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Thi Anh Le [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Duy Quang Pham [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Lishan Peng [email protected] VinUniversity, Hanoi, Viet Nam, 100000 View all articles by this author Metrics & Citations Metrics Article Usage 20 views 20 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Ngoc Quang Tran, Phuong Dung Ngoc Tran, Trần-Phú Thành, et al. Reconstruction of NiCu Hydroxide–Organic Frameworks into Active Oxyhydroxides Enables Industrial-Grade Seawater Electrolysis. Authorea . 13 May 2026. DOI: https://doi.org/10.22541/authorea.15003291/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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