Ruthenium Anchored Laser‐Induced Graphene as Binder‐Free and Free‐Standing Electrode for Selective Electrosynthesis of Ammonia from Nitrate

作者：Zekun Geng, Zhiliang Feng, Haoran Kong, Jiaqi Su, Kaiyan Zhang, Jiaxin Li, Xinzhi Sun, Xiaojuan Liu, Lei Ge, Panpan Gai, Feng Li · 发表于：Advanced Science · 年份：2024 · DOI：10.1002/advs.202406843 · 被引用次数：26 · 研究领域：Ammonia Synthesis and Nitrogen Reduction、Caching and Content Delivery、Catalytic Processes in Materials Science

Abstract Developing effective electrocatalysts for the nitrate reduction reaction (NO 3 RR) is a promising alternative to conventional industrial ammonia (NH 3 ) synthesis. Herein, starting from a flexible laser‐induced graphene (LIG) film with hierarchical and interconnected macroporous architecture, a binder‐free and free‐standing Ru‐modified LIG electrode (Ru‐LIG) is fabricated for electrocatalytic NO 3 RR via a facile electrodeposition method. The relationship between the laser‐scribing parameters and the NO 3 RR performance of Ru‐LIG electrodes is studied in‐depth. At −0.59 V RHE , the Ru‐LIG electrode exhibited the optimal and stable NO 3 RR performance (NH 3 yield rate of 655.9 µg cm −2 h −1 with NH 3 Faradaic efficiency of up to 93.7%) under a laser defocus setting of +2 mm and an applied laser power of 4.8 W, outperforming most of the reported NO 3 RR electrodes operated under similar conditions. The optimized laser‐scribing parameters promoted the surface properties of LIG with increased graphitization degree and decreased charge‐transfer resistance, leading to synergistically improved Ru electrodeposition with more exposed NO 3 RR active sites. This work not only provides a new insight to enhance the electrocatalytic NO 3 RR performance of LIG‐based electrodes via the coordination with metal electrocatalysts as well as identification of the critical laser‐scribing parameters but also will inspire the rational design of future advanced laser‐induced electrocatalysts...