Phu Thi Kim Cuong, Pham Thanh Ngoc, Nguyen An-Giang, Tran Thi Nhan, Tran Thi Minh-Anh, Le Ngan Nguyen, Nguyen Phi Long, Phung Thi Viet Bac
Center for Environmental Intelligence and College of Engineering and Computer Science, VinUniversity, Hanoi, Vietnam.
Faculty of Engineering - Technology and Environment, An Giang University, Long Xuyen, Vietnam.
iScience. 2025 May 22;28(6):112729. doi: 10.1016/j.isci.2025.112729. eCollection 2025 Jun 20.
Ambient temperature electrochemical ammonia synthesis via nitrate reduction reaction (NORR) is a promising alternative to the energy-intensive Haber-Bosch process but lacks effective electrocatalysts for practical applications. In this work, MnO 2D-nanoflakes are anchored onto 2D-MXene TiCT, forming a heterogeneous catalyst for NORR with an ammonia yield of 14.06 ± 0.48 mg h.mg at -1.2 V versus reversible hydrogen electrode (vs. RHE) and a Faradaic efficiency (FE) of 85.23 ± 1.62% at -1.0 vs. RHE, along with good stability over six consecutive cycles, with NH FE exceeding 75% at -1.0 V vs. RHE in 0.5 M KSO and 0.1 M KNO electrolyte. As a cathode in a Zn-NO battery with a polished Zn plate from spent Zn-C batteries as anode, it delivers a power density of 0.323 mW cm and NH FE of ∼79.9%. This study highlights a highly effective electrocatalyst for NORR and its potential in self-powered NH production.
通过硝酸盐还原反应（NORR）进行环境温度电化学氨合成是能源密集型哈伯-博施法的一种有前途的替代方法，但缺乏适用于实际应用的有效电催化剂。在这项工作中，MnO₂二维纳米片锚定在二维MXene TiCT上，形成一种用于NORR的非均相催化剂，在相对于可逆氢电极（vs. RHE）为-1.2 V时氨产率为14.06±0.48 mg h·mg，在相对于RHE为-1.0 V时法拉第效率（FE）为85.23±1.62%，并且在连续六个循环中具有良好的稳定性，在0.5 M KSO和0.1 M KNO电解液中相对于RHE为-1.0 V时NH₃ FE超过75%。作为以废旧锌碳电池中的抛光锌板为阳极的锌-硝酸盐电池的阴极，它的功率密度为0.323 mW cm²，NH₃ FE约为79.9%。这项研究突出了一种用于NORR的高效电催化剂及其在自供电氨生产中的潜力。
