多层核心外金属氧化物/化物/碳及其高电降解率的酸盐到氨
Xiaoyu Li1, Ping Deng1, Mengqiu Xu1
1College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China. yewei@hznu.edu.cn.
Nanoscale
|August 29, 2023
概括
这项研究介绍了一种新的MoO2/Fe4N/C催化剂,用于高效的酸盐电还原到氨,克服了诸如进化和低效率等挑战. 催化剂显示出高氨产量和稳定性,为传统的氨合成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
- 催化剂是一种催化剂.
背景情况:
- 酸盐电还原为氨提供了哈伯-博什合成的替代方法,以及将酸盐废物转化为有价值的化学物质的方法.
- 挑战包括竞争的演化反应 (HER),低氨转化效率以及缺乏催化剂稳定性和可持续性.
- 反矿结构的Fe4N具有独特的电子结构,有利于电催化应用.
研究的目的:
- 设计和合成一种新型的多层核心外氧化物/化物/C催化剂,用于高效的酸盐电还原.
- 研究用于氨合成的设计催化剂的催化性能,选择性和耐久性.
- 探索抗矿Fe4N基材料在电化学酸盐转化中的潜力.
主要方法:
- 制造一个多层核心外催化剂 (MoO2/Fe4N/C),使用并联不成比例反应和化-碳化路径.
- 电化学表征包括酸盐还原反应 (NO3RR) 测量,法拉第效率和能效测定.
- 在各种电解质条件下 (度和pH) 测试电催化剂的稳定性.
主要成果:
- 这种MoO2/Fe4N/C催化剂实现了11.10 molNH gcat.-1 h-1 (1.67 mmol cm-2 h-1) 的高氨产率,具有99.3%的法拉第效率.
- 半电池的能量效率高达30%,超过了之前的研究.
- 催化剂在广泛的KNO3电解质度 (0.50-1.00M) 和pH值 (6-14) 中表现出长期稳定性和有效性.
结论:
- 开发的MoO2/Fe4N/C电催化剂有效地抑制了HER,并增强了电子/中间体运输,从而在酸盐电还原中获得了高性能.
- 催化剂的设计,利用反矿Fe4N,为NO3RR提供了高度活跃,选择性和耐用的电催化剂的途径.
- 这项工作指导了用于可持续生产氨和酸盐整治的先进催化剂的合理设计.
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