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http://hdl.handle.net/10397/106799
Title: | Stable Seawater Oxidation at High-Salinity Conditions Promoted by Low Iron-Doped Non-Noble-Metal Electrocatalysts | Authors: | Zhang, D Cheng, H Hao, X Sun, Q Zhang, T Xu, X Ma, Z Yang, T Ding, J Liu, X Yang, M Huang, X |
Issue Date: | Dec-2023 | Source: | ACS catalysis, 1 Dec. 2023, v. 13, no. 23, p. 15581-15590 | Abstract: | Electrocatalytic seawater splitting offers a promising avenue for cost-effective and environmentally friendly hydrogen production. However, the activity of catalysts has significantly degraded at high-salinity conditions, preventing commercial-scale practical applications. Here, we demonstrate that iron-doped nickel-based electrocatalysts with low doping concentration exhibit an outstanding performance for the oxygen evolution reaction (OER) in seawater, particularly at high-salinity conditions. Notably, the OER catalysts present only a marginal increase in overpotential of ∼5 mV as the sodium chloride concentration in the electrolyte increases from 0 M to saturation. Furthermore, the low iron-doped electrocatalysts sustain consistent oxygen generation over 100 h of operation in a saturated seawater electrolyte. Supported by first-principles calculations, we unravel that low-concentration iron doping in Ni-based catalysts can mitigate chloride ion adsorption, thereby amplifying the OER activity in saturated seawater electrolytes, which is in contrast with high iron-doped electrocatalysts. Our work provides a useful perspective on designing catalysts for electrolytic seawater OER, potentially paving the way for large-scale implementation of seawater splitting technologies. | Keywords: | high-salinity condition hydrogen production non-noble-metal electrocatalysts oxygen evolution reaction seawater splitting |
Publisher: | American Chemical Society | Journal: | ACS catalysis | EISSN: | 2155-5435 | DOI: | 10.1021/acscatal.3c03528 |
Appears in Collections: | Journal/Magazine Article |
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