单个Ag原子在WO3上诱导Ag-N/O键,用于超稳定的酸氨合成
Jidong Yu1, Rui-Ting Gao1,2, Shijie Ren1
1College of Chemistry and Chemical Engineering, College of Energy Material and Chemistry, Inner Mongolia Key Laboratory of Low Carbon Catalysis, Inner Mongolia University, Hohhot, 010021, China.
Angewandte Chemie (International ed. in English)
|July 8, 2025
概括
这项研究提出了一种新的催化剂,用于从酸盐有效合成氨. 氧化物纳米线上的单个银原子在酸性条件下能够实现稳定和选择性的电化学减少,克服了废水处理的关键挑战.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 环境化学环境化学
背景情况:
- 废水中的酸盐污染对环境构成风险.
- 电化学酸盐降解为氨是一种有前途但具有挑战性的技术.
- 酸性条件带来了催化剂腐蚀和演化反应 (HER) 的竞争问题.
研究的目的:
- 开发一种高活性,稳定和选择性的催化剂,用于将酸性电化学酸盐减少为氨.
- 为了研究增强催化性能的机制.
- 为了证明催化剂在用于氨电合成的膜电极组件 (MEA) 中的应用.
主要方法:
- 在1D WO3纳米线上合成单个Ag原子,形成Ag-N/O键.
- 电化学测试,包括循环电压测量和时电压测量.
- 实验和理论分析 (例如,DFT) 以阐明反应机制.
- 膜电极组件 (MEA) 的制造和测试.
主要成果:
- 在一个广泛的潜能范围 (-0.6到-0.2V RHE) 中实现了 >90%的氨法拉戴克效率 (FE).
- 证明了特殊的稳定性:480 mA cm-2电流密度超过1100小时与~94%FE.
- 报告的NH3生产率为12.75 mmol h-1在一个MEA与>90%FE超过30小时.
- 确定Ag-N/O键对于增强酸盐吸附和降低能量障碍至关重要.
结论:
- 在WO3纳米线上的Ag-N/O键有效地促进氨合成,同时在酸性介质中抑制HER.
- 开发的催化剂表现出优越的活性,选择性和长期稳定性,用于电化学酸盐降解.
- 这项工作为抗腐蚀电催化剂在酸氨电合成和废水处理中提供了可行的策略.
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