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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/127376
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| Title: | A photovoltaic-electrolysis system with high solar-to-hydrogen efficiency under practical current densities |
| Authors: | Zhang, Qingran;Shan, Yihao;Pan, Jian;Kumar, Priyank;Keevers, Mark J;Lasich, John;Kour, Gurpreet;Daiyan, Rahman;Ivan, Perez-Wurf;Thomsen, Lars;Cheong, Soshan;Jiang, Junjie;Wu, Kuang-Hsu;Chiang, Chao-Lung;Grayson, Kristian;Green, Martin A;Amal, Rose;Lu, Xunyu |
| Date: | 2025-02-26 |
| Issue Date: | 2025-05-28 12:05:09 (UTC+8) |
| Publisher: | American Association for the Advancement of Science |
| Abstract: | The photovoltaic-alkaline water (PV-AW) electrolysis system offers an appealing approach for large-scale green hydrogen generation. However, current PV-AW systems suffer from low solar-to-hydrogen (STH) conversion efficiencies (e.g., <20%) at practical current densities (e.g., >100 mA cm−2), rendering the produced H2 not economical. Here, we designed and developed a highly efficient PV-AW system that mainly consists of a customized, state-of-the-art AW electrolyzer and concentrator photovoltaic (CPV) receiver. The highly efficient anodic oxygen evolving catalyst, consisting of an iron oxide/nickel (oxy)hydroxide (Fe2O3-NiOxHy) composite, enables the customized AW electrolyzer with unprecedented catalytic performance (e.g., 1 A cm−2 at 1.8 V and 0.37 kgH2/m−2 hour−1 at 48 kWh/kgH2). Benefiting from the superior water electrolysis performance, the integrated CPV-AW electrolyzer system reaches a very high STH efficiency of up to 29.1% (refer to 30.3% if the lead resistance losses are excluded) at large current densities, surpassing all previously reported PV-electrolysis systems. |
| Relation: | Science Advances 11(9) |
| DOI: | 10.1126/sciadv.ads0836 |
| Appears in Collections: | [Graduate Institute & Department of Chemical and Materials Engineering] Journal Article
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