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Seawater electrolysis for hydrogen production represents a substantial opportunity to curtail production expenditures and exhibits considerable potential for various industrial applications. Platinum-based precious metals exhibit excellent activity for water electrolysis. However, their limited reserves and high costs impede their widespread use on a large scale. Single-atom catalysts, characterized by low loading and high utilization efficiency, represent a viable alternative, and the development of simple synthesis methods can facilitate their practical application. In this work, we report the facile synthesis of a single-atom Pt-loaded NiCoFeSx (Pt@NiCoFeSx) bifunctional catalytic electrode using a simple impregnation method on a nickel foam substrate. The resulting electrode exhibits low overpotentials for both HER (60 mV@10 mA cm−2) and OER (201 mV@10 mA cm−2) in alkaline seawater electrolytes. When incorporated into a seawater electrolyzer, this electrode achieves a direct current energy consumption of only 4.18 kWh/Nm3H2 over a 100 h test period with negligible decay. These findings demonstrate the potential of our approach for industrial-scale seawater electrolysis. [ABSTRACT FROM AUTHOR]

[Display omitted] • The direct stereoselective β-sulfonylation of tertiary enamides with sulfonyl chlorides was achieved. • A range of (E)-β-amidovinyl sulfones were prepared without noble metal catalyst in good yield. • This protocol features simple operation, broad functional group tolerance and easy availability of raw materials. An efficient and concise copper(I) bromide-mediated stereoselective β-sulfonylation of tertiary enamides with sulfonyl chlorides was achieved. This reaction proceeds smoothly with absolute E -selectivity and affords a range of (E)-β-amidovinyl sulfones bearing manifold functional groups in good yields. Moreover, this protocol features simple operation, excellent functional group tolerance and easy availability of raw materials. Mechanistic experiments indicate that the direct sulfonylation may proceed in a radical pathway. [ABSTRACT FROM AUTHOR]