Large-current-density electrolysis of seawater is promising for massive hydrogen (H2) production. This process, however, requires high-performance and cost-effective bifunctional catalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction...

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Electrochemical nitrite (NO2 –) reduction is a promising approach for ambient ammonia (NH3) synthesis and simultaneous mitigation of NO2 – contaminant in wastewater. Herein, we report Ni nanoparticle supported on molasses-derived carbon sheets (Ni@MDC) as an earth-abundant electrocatalyst for NO2 –-to-NH3 conversion. When tested in alkaline solutions with 0.1 M NO2 –, such Ni@MDC obtains a high NH3 yield of 6.3 mg h–1 mgcat –1 with a Faradaic efficiency of 65.4% at −0.8 V versus reversible hydrogen electrode under ambient conditions. Furthermore, it shows remarkable electrochemical stability during long-term electrolysis and cycling tests.