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Title: Self-Supported Pd Nanorod Arrays for High-Efficient Nitrate Electroreduction to Ammonia. Author: Guo H, Li M, Yang Y, Luo R, Liu W, Zhang F, Tang C, Yang G, Zhou Y. Journal: Small; 2023 Mar; 19(10):e2207743. PubMed ID: 36683224. Abstract: Electrochemical nitrate (NO3- ) reduction to ammonia (NH3 ) offers a promising pathway to recover NO3- pollutants from industrial wastewater that can balance the nitrogen cycle and sustainable green NH3 production. However, the efficiency of electrocatalytic NO3- reduction to NH3 synthesis remains low for most of electrocatalysts due to complex reaction processes and severe hydrogen precipitation reaction. Herein, high performance of nitrate reduction reaction (NO3- RR) is demonstrated on self-supported Pd nanorod arrays in porous nickel framework foam (Pd/NF). It provides a lot of active sites for H* adsorption and NO3- activation leading to a remarkable NH3 yield rate of 1.52 mmol cm-2 h-1 and a Faradaic efficiency of 78% at -1.4 V versus RHE. Notably, it maintains a high NH3 yield rate over 50 cycles in 25 h showing good stability. Remarkably, large-area Pd/NF electrode (25 cm2 ) shows a NH3 yield of 174.25 mg h-1 , be promising candidate for large-area device for industrial application. In situ FTIR spectroscopy and density functional theory calculations analysis confirm that the enrichment effect of Pd nanorods encourages the adsorption of H species for ammonia synthesis following a hydrogenation mechanism. This work brings a useful strategy for designing NO3- RR catalysts of nanorod arrays with customizable compositions.[Abstract] [Full Text] [Related] [New Search]