Intentional corrosion-induced reconstruction of defective NiFe layered double hydroxide boosts electrocatalytic nitrate reduction to ammonia
Nature Water(2023)
摘要
The electroreduction of nitrate to ammonia is particularly important in mitigating environmental pollution and obtaining value-added products. Although non-toxic and inexpensive iron-based materials are expected to be a promising catalyst for electrochemical nitrate reduction, ensuring their sustained high activity and inhibiting spontaneous corrosion requires the implementation of complex design. Here we report an economical self-corrosion approach that utilizes Ni 2+ ions in wastewater to control the formation of NiFe layered double hydroxide active phase on iron surface, resulting in high nitrate conversion (97.2%) and ammonia selectivity (90.3%). Coupling nitrate reduction with acid absorption, the conversion from NO 3 − to (NH 4 ) 2 SO 4 (s) for applications such as acting as fertilizer are achieved. This distinctive ‘waste-to-treasure’ perspective not only challenges the conventional belief that corrosion diminishes active phase but also notably improves catalytic efficiency while harnessing valuable resources from wastewater, offering a practical method for converting nitrate to useful ammonia products.
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