Design and development of high-efficiency and durable oxygen evolution reaction (OER) electrocatalysts is crucial for hydrogen production from seawater splitting. Herein, we report the in situ electrochemical conversion of a nanoarray of Ni(TCNQ)₂ (TCNQ = tetracyanoquinodimethane) on graphite paper into Ni(OH)₂ nanoparticles confined in a conductive TCNQ nanoarray (Ni(OH)₂-TCNQ/GP) by anode oxidation. The Ni(OH)₂-TCNQ/GP exhibits high OER performance and demands overpotentials of 340 and 382 mV to deliver 100 mA·cm⁻² in alkaline freshwater and alkaline seawater, respectively. Meanwhile, the Ni(OH)₂-TCNQ/GP also demonstrates steady long-term electrochemical durability for at least 80 h under alkaline seawater.

Electrochemical reduction of NO offers us an attractive alternative to traditional selective catalytic reduction process for harmful NO removal and simultaneous NH₃ production, but it requires efficient electrocatalyst to enable the NO reduction reaction with high selectivity. Here, we report on the development of Bi nanoparticles/carbon nanosheet composite (Bi@C) for highly effective NO reduction electrocatalysis toward selective NH₃ formation. Such Bi@C catalyst attains an impressive NH₃ yield of 1,592.5 μg·h⁻¹·mg_cat.⁻¹ and a high Faradaic efficiency as high as 93% in 0.1 M Na₂SO₄ electrolyte. Additionally, it can be applied as efficient cathode materials for Zn–NO battery to reduce NO to NH₃ with high electricity generation.