Herein, we develop a sputtered NiFeW-oxide thin-film bifunctional electrocatalyst with the incorporated oxygen vacancies and multivalent cations of Ni, Fe, and W to enhance the economic viability of electrocatalytic nitrate reduction for commercial applications. Our NFW-0.5 achieves a notable 54.6 mg/h.cm ammonia yield rate at a modest applied potential of −0.2 V . RHE, coupled with an outstanding Faradaic efficiency of 93.7%. Furthermore, our NFW-0.5(+)‖NFW-0.5(−) flow-cell electrolyzer with a larger electrode of 2×2 cm reveals an impressive ammonia productivity of 143.5 mg/h.cm at a cell voltage of 2.0 V, accompanied by a superior Faradaic efficiency of 96.1%, an energy efficiency of 26%, and a low energy consumption of 26.3 kWh/kg.NH. An oxygen vacancy-based NO-pinned mechanism is proposed to explain our excellent nitrate reduction. Our work introduces a new paradigm to design efficient and bifunctional electrocatalysts for potential industrial-scale ammonia production.

中文翻译：

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采用磁控溅射技术制成的双功能 NiFeW 氧化物薄膜电极开发节能的硝酸盐-氨流通池


在此，我们开发了一种溅射 NiFeW 氧化物薄膜双功能电催化剂，其中掺入了氧空位和 Ni、Fe 和 W 的多价阳离子，以增强电催化硝酸盐还原商业应用的经济可行性。我们的 NFW-0.5 在 -0.2V 的适度施加电位下实现了显着的 54.6mg/h.cm 氨产率。 RHE，加上出色的法拉第效率 93.7%。此外，我们的 NFW-0.5(+)‖NFW-0.5(−) 流通池电解槽具有 2×2cm 的较大电极，在 2.0V 的电解槽电压下，氨生产率高达 143.5mg/h.cm，同时伴随着法拉第效率高达 96.1%，能源效率高达 26%，能耗低至 26.3 kWh/kg.NH。提出了一种基于氧空位的 NO 固定机制来解释我们出色的硝酸盐还原作用。我们的工作引入了一种新的范例来设计高效的双功能电催化剂，用于潜在的工业规模氨生产。