Two‐dimensional Cu Plates with Steady Fluid Fields for High‐rate Nitrate Electroreduction to Ammonia and Efficient Zn‐Nitrate Batteries
Limin Zhou, Xueqiu Chen, Shaojun Zhu, Kun You, Zhengjun Wang, Ru Fan, Jun Li, Yifei Yuan, Xin Wang, Jichang Wang, Yihuang Chen, Huile Jin, Shun Wang, Jingjing Lv
Abstract
Abstract Nitrate electroreduction reaction (eNO 3 − RR) to ammonia (NH 3 ) provides a promising strategy for nitrogen utilization, while achieving high selectivity and durability at an industrial scale has remained challenging. Herein, we demonstrated that the performance of eNO 3 − RR could be significantly boosted by introducing two‐dimensional Cu plates as electrocatalysts and eliminating the general carrier gas to construct a steady fluid field. The developed eNO 3 − RR setup provided superior NH 3 Faradaic efficiency (FE) of 99 %, exceptional long‐term electrolysis for 120 h at 200 mA cm −2 , and a record‐high yield rate of 3.14 mmol cm −2 h −1 . Furthermore, the proposed strategy was successfully extended to the Zn‐nitrate battery system, providing a power density of 12.09 mW cm −2 and NH 3 FE of 85.4 %, outperforming the state‐of‐the‐art eNO 3 − RR catalysts. Coupled with the COMSOL multiphysics simulations and in situ infrared spectroscopy, the main contributor for the high‐efficiency NH 3 production could be the steady fluid field to timely rejuvenate the electrocatalyst surface during the electrocatalysis.