Ampere-level ammonia synthesis through grain boundary engineering
发布时间：2026-09-15
点击次数：
- 发布时间：
- 2026-09-15
- 论文名称：
- Ampere-level ammonia synthesis through grain boundary engineering
- 教研室：
- 催化反应工程与吸附材料教研室
- 发表刊物：
- Nature Synthesis
- 摘要：
- Plasma-electrolysis tandem systems can facilitate ammonia (NH3) production from air and water under ambient conditions via an ‘air → NOx → NOx− → NH3’ pathway. However, NH3 yields are limited due to a lack of process intensification between plasma generation and electrocatalytic conversion. Here we report a modified cobalt cathode enriched with twin boundaries (TBs) and stacking faults (SFs) (TB/SF-Co) for selective NO2− reduction. Mechanistic analyses reveal that TB/SF defects upshift the Co d-band centre which strengthens NO2− adsorption and promotes hydrogenation of intermediates. The material achieves a Faradaic efficiency of 96.7% for NO2−-to-NH3 conversion at a partial current density of −1.73 A cm−2. Coupling a cobalt cathode enriched with twin boundaries and stacking faults with a microwave plasma module enables efficient air-to-NH3 synthesis, achieving an air-to-NO2− rate of 0.745 mol h−1 and NO2−-to-NH3 rate of 0.619 mol h−1 with >95% Faradaic efficiency at a total current of more than 101 A in 100 cm2 parallel electrolyzers, which rivals or exceeds contemporary benchmarks.
- 论文类型：
- 期刊论文
- 通讯作者：
- 杨贵东,欧鸿辉
- 是否译文：
- 否
- 收录刊物：
- SCI