§ Longcheng Zhang and Jie Liang contributed equally to this work. Benzoate anions-intercalated NiFe-LDH nanosheet on carbon cloth (BZ-NiFe-LDH/CC) behaves as a highly efficient and durable electrocatalyst for alkaline seawater oxidation. In alkaline seawater, it attains the current density of 500 mA cm -2 at a low overpotential of 610 mV for 100-h uninterrupted electrolysis with no obvious structural change, reflecting significantly boosted activity and resistance toward chlorine species corrosion.

NH serves as an attractive hydrogen storage medium and a renewable energy sector for a sustainable future. Electrochemical reduction is a feasible ambient reaction to convert N to NH, while it needs efficient electrocatalysts for the N reduction reaction (NRR) to meet the challenge associated with N activation. In this Letter, we report on our recent experimental finding that the TiO nanosheets array on the Ti plate (TiO/Ti) is effective for electrochemical N conversion to NH at ambient conditions. When tested in 0.1 M NaSO, such TiO/Ti attains a high NH yield of 9.16 × 10 mol s·cm with corresponding Faradaic efficiency of 2.50% at -0.7 V vs reversible hydrogen electrode, outperforming most reported aqueous-based NRR electrocatalysts. It also shows excellent selectivity for NH formation with high electrochemical stability. The superior NRR activity is due to the enhanced adsorption and activation of N by oxygen vacancies in situ generated during electrochemical tests.

The sodium storage mechanism of hard carbon, optimization strategies of electrochemical performance, and the scientific challenges towards the commercialization of sodium-ion batteries were systematically summarized and analyzed.

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