在电化学氨基合成中,Spinel Co3O4上的活性成分的因子依赖进化
Anquan Zhu1, Heng Liu2, Shuyu Bu1
1Department of Materials Science and Engineering, & Center of Super-Diamond and Advanced Films, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong.
ACS nano
|August 6, 2024
概括
斯宾尼尔氧化物 (Co3O4) 催化酸盐降解为氨. Co3O4 的 {111} 方面表现出优异的性能,归因于氧气空缺和重建的 Co(OH) 2 活性位点,以有效合成氨.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 尖氧化物 (Co3O4) 是电化学降解反应 (eNO3RR) 到氨的有希望的,低成本的催化剂.
- 了解晶体学方面的作用对于优化催化剂性能至关重要,但仍然不清楚.
研究的目的:
- 为了研究不同暴露的晶体学方面 ({100},{111},{110},{112}) 的Co3O4对eNO3RR活动的影响.
- 阐明催化机制,并在氨合成过程中识别活性物种.
主要方法:
- 合成具有受控暴露面的Co3O4纳米结构.
- 对eNO3RR的催化剂进行电化学评估.
- 现场/操作性特征和理论计算 (DFT) 来研究反应机制和活性位点.
主要成果:
- Co3O4 {111} 表现出最高的性能,达到99.1%的氨法拉第效率和35.2毫克的收益率h-1 cm-2在-0.6V与RHE.
- 观察到涉及Co3O4,氧空缺 (Ov) 和Co (OH) 2的面相依赖的转化途径,其中 (111) 表面表现出最快速的活性物种形成.
- 氧气空缺显著降低了NH2中介形成的能量屏障,重建的CO (OH) 2提供了丰富的活性场所.
结论:
- Co3O4 的 {111} 方面是通过eNO3RR通过氨基合成的理想选择,因为氧空缺和Co(OH) 2.2.的迅速形成.
- 调整暴露面提供了一种可行的策略,用于设计高效的Co-based spinel催化剂,用于生产氨.
- 这项研究提供了对活性部位和反应机制的关键见解,推进了eNO3RR的催化剂设计.
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