Feng Yangyang, Huang Lanting, Xiao Zhiwei, Zhuang Xu, Aslam Tayyab Sohail, Zhang Xiang, Tan Yan-Xi, Wang Yaobing
College of Chemistry, Institute of Molecular Engineering Plus, Fuzhou University, Fuzhou, Fujian 350116, P. R. China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian P. R. China.
J Am Chem Soc. 2024 Mar 20;146(11):7771-7778. doi: 10.1021/jacs.4c00369. Epub 2024 Mar 7.
Ammonia splitting to hydrogen is a decisive route for hydrogen economy but is seriously limited by the complex device and low efficiency. Here, we design and propose a new rechargeable Zn-NH battery based on temporally decoupled ammonia splitting to achieve efficient NH-to-H conversion. In this system, ammonia is oxidized into nitrogen during cathodic charging (2NH + 6OH → N + 6HO + 6e) with external electrical energy conversion and storage, while during cathodic discharging, water is reduced to hydrogen (2HO + 2e → H + 2OH) with electrical energy generation. In this loop, continuous and efficient H production without separation and purification is achieved. With the help of the ammonia oxidation reaction (AOR) and hydrogen evolution reaction (HER) bifunctional catalyst of MoC/NiCu@C, a rechargeable Zn-NH battery is realized that exhibits a high NH-to-H FE of 91.6% with outstanding durability for 900 cycles (300 h) at 20 mA/cm, enabling efficient and continuous NH-to-H conversion.
氨分解制氢是氢经济的关键途径，但受到复杂装置和低效率的严重限制。在此，我们设计并提出了一种基于时间解耦氨分解的新型可充电锌-氨电池，以实现高效的氨到氢的转化。在该系统中，在阴极充电过程中（2NH + 6OH → N + 6HO + 6e），氨在外部电能转换和存储的情况下被氧化成氮气，而在阴极放电过程中，水被还原成氢气（2HO + 2e → H + 2OH）并产生电能。在这个循环中，无需分离和纯化即可实现连续高效的氢气生产。借助MoC/NiCu@C的氨氧化反应（AOR）和析氢反应（HER）双功能催化剂，实现了一种可充电锌-氨电池，其氨到氢的法拉第效率高达91.6%，在20 mA/cm下具有出色的900次循环（300小时）耐久性，能够实现高效连续的氨到氢的转化。
