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• W4365520126 endingPage "108439" @default.
• W4365520126 startingPage "108439" @default.
• W4365520126 abstract "Direct sea water splitting as a source of clean and uninterrupted energy source is an unparalleled approach to sustainable development. Chlorine oxidation, however, strongly limits its usage and thus requests novel avenues to create chlorine-repelling electrocatalysts for pure oxygen evolution under direct-sea water conditions. Herein, for the first time, a NiS2pSxsurface (catenated sulphur type Ni polysulfide)-based binder-free, 3D electrocatalyst is established as an excellent oxygen evolution reaction (OER) catalyst under un-buffered neutral water conditions, exhibiting a remarkably decreased overpotential (Δη∼320 mV) in comparison to nowadays accepted noble metal IrO2 catalyst. This overpotential value (∼ 360 mV, lowest ever reported in the literature) is lower than the limit for chlorine evolution in neutral conditions, thus furnish a potential platform for intrinsically chlorine-phobic OER electrocatalysis for direct sea water splitting. Surprisingly, quantitative analysis of electro-oxidation products in 0.5 M NaCl using our NiS2pSxsurface electrocatalyst demonstrates the sole formation of pure oxygen, without any chlorine, which is inevitable when using IrO2 and Pt as catalysts. The intrinsic ion-selective behavior of our electrocatayst is related to limited exposure of the sterically and electrostatically hindered Ni metal centers to large Cl- ions, thus selectively evolving oxygen. Furthermore, the fast electrochemical evolution of the NiS2pSxsurface surface to form catenated sulphur type polysulphides species (pSn2-/ S2-=2.1) further enhances the intrinsic chlorine-phobicity of the catalyst, displaying pure oxygen evolution even at noteworthy current densities up to 300 mA/cm2. This is the first demonstration of intrinsically chlorine-phobic catalytic electrodes for the “direct” sea water splitting, displaying unprecedented electrochemical performances and stability, which further opens new paths towards engineering the electrocatalysts surface aiming for intrinsically ion-selective electrodes for various applications." @default.
• W4365520126 created "2023-04-15" @default.
• W4365520126 creator A5006672168 @default.
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• W4365520126 date "2023-06-01" @default.
• W4365520126 modified "2023-10-10" @default.
• W4365520126 title "Pioneering practical direct sea water splitting via an intrinsically-selective chlorine-phobic nickel polysulphide nanostructured electrocatalyst for pure oxygen evolution" @default.
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• W4365520126 doi "https://doi.org/10.1016/j.nanoen.2023.108439" @default.
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