Harnessing Nickel Phthalocyanine-Based Electrochemical CNT Sponges for Ammonia Synthesis from Nitrate in Contaminated Water

• DOI: 10.1021/acsami.2c16856
• Publication Date: 2022-11-24T11:51:10Z
• Authors: Yang Li; Lehui Ren; Zhouyan Li; Tianlin Wang; Zhichao Wu; Zhiwei Wang
• Keywords: Reversible hydrogen electrode

Electrochemical reduction of nitrate to ammonia is great interest in water treatment with regard the conversion contaminants value-added products, which requires development advanced electrodes achieve high selectivity, stability, and Faradaic efficiency (FE). Herein, nickel phthalocyanine was homogeneously doped into fiber a carbon nanotube (CNT) sponge, enabling production an electrode electrochemical double-layer capacitance (CDL) large electrochemically active surface area (ECSA). The as-prepared NiPc-CNT sponge could 97.6% removal, 88.4% 86.8% FE at concentration 50 mg-N L-1 under optimized potential -1.2 V (vs Ag/AgCl). Meanwhile, selectivity be further improved concentration. Density functional theory calculations showed that exposure Ni-N4 sites effectively suppress hydrogen evolution reaction dinitrogen generation, enhancing efficiency. Overall, this work sheds light on metal phthalocyanine-based electrode, offering novel strategy for managing wastewater.