酸盐到氨的并联电还原,使用铜混合单原子/集群催化剂,具有协同效应
Jungwon Suh1, Hyeonuk Choi1, Yujin Kong1
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
这项研究引入了一种新型的铜混合单原子/集群催化剂 (Co-Cu SCC),用于高效的电化学转化废酸盐为氨. 催化剂实现了高度的氨选择性和效率,为哈伯-博斯工艺提供了可持续的替代方案.
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
- 环境科学 环境科学
背景情况:
- 氨合成的哈伯 - 博什工艺是能源密集的.
- 电化学酸盐降解为氨 (NTR) 为能源和储存提供了一个可持续的替代方案.
- 在NTR的挑战包括低能效,由于高的潜在过量和差的选择性.
研究的目的:
- 开发一种高效和选择性的催化剂,用于电化学酸盐转化为氨.
- 研究混合单原子/集群催化剂 (SCC) 的协同效应,以提高性能.
- 为了展示催化剂在膜电极组装系统中的实际应用.
主要方法:
- 合成一个铜混合单原子/集群催化剂 (Co-Cu SCC),在碳支上.
- 电化学表征包括法拉第效率和电位测量.
- 在现场分析以阐明反应路径和催化机制.
- 在基于双极膜 (BPM) 的膜电极组件 (MEA) 中进行长期稳定性测试.
主要成果:
- 在Co─Cu SCC实现了高氨法拉第效率91.2%在低电位的-0.3V对比RHE.
- 观察到Co和Cu活性位点之间的协同效应,Cu催化酸盐到酸盐,Co催化酸盐到氨.
- 双重电还原路径绕过了速率决定的步骤,降低了反应能量屏障.
- 与单个Co或Cu SCC相比,催化剂表现出更好的性能,氨部分电流密度增加了2.3-5.4倍.
- 在BPM-MEAs系统中实现了32小时的稳定运行,产生高度氨.
结论:
- Co-Cu SCC 是电化学酸盐转化为氨的高效和选择性催化剂.
- 催化剂的性能归因于异质活性位点和并联电还原路径之间的协同相互作用.
- 这种方法为可持续的氨合成和环境修复提供了一个有希望的策略.
- 经过证明的稳定性和可扩展性表明,在碳中和能源和储存方面有实际应用的潜力.
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