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Cu-MOF derived two-dimensional copper-carbon nanosheets for efficient nitrate reduction

Journal of Alloys and Compounds, ISSN: 0925-8388, Vol: 1008, Page: 176602
2024
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In recent years, the strategy of reducing ammonia (NH 3 ) from nitrate-related sources such as industrial wastewater driven by clean energy sources has garnered significant attention. Previous studies have shown that Cu-based species can effectively catalyze nitrate reduction reaction (NO 3 RR), but the reaction intermediates tend to aggregate on the surface of catalysts, resulting in low Faraday efficiency. In this study, two-dimensional porous carbon nanosheets were successfully prepared through direct pyrolysis of a mixture of ZnCu-BTC crystal and FeCl 3 salt. Interestingly, cube-shaped CuCl nanoparticles were easily precipitated from the MOF-derived carbon surface during acid etching process. The resulting CuCl-CNS exhibited good NO 3 RR performance, achieving an NH 3 yield of 96.9 % and 292.5 µmol h −1 cm −2 at −0.60 V versus reversible hydrogen electrode. Moreover, the assembled zinc-nitrate battery revealed a peak power density of 4.73 mW cm −2 and long-term cycle stability. This work provides valuable insights into the development of MOF-derived Cu-based nanocomposites for effective nitrate reduction.

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