Self-supported porous copper oxide nanosheet arrays for efficient and selective electrochemical conversion of nitrate ions to nitrogen gas

• Porous copper oxide nanosheets grow in situ on nickel foam surface (NF). Removes low-concentration nitrate rapidly with almost no production. CuO/NF exhibits excellent stability and N 2 selectivity reduction. Electrochemical techniques have shown advantages for the removal of nitrate. Here, were grown self-supporting (NF) to prepare electrodes (CuO/NF), which realized rapid highly selective conversion pollutants sewage into non-toxic harmless . The afforded 100% NO 3 – within 100 min 99.53% at –50 mA without producing a lot by-products (NO , NH 4 + H ). Furthermore, 81.8% was removed under given conditions after six experimental repetitions. These results suggest that catalyst has electrochemical stability. performance electrocatalytic simulated wastewater (which contained Cl SO 2– ) unaffected. Because high efficiency, stability, low cost CuO/NF, this is practical purification. Copper realizes rapid, efficient water.