基于石的电催化剂,通过合CO2降解和甲醇氧化来产生相同的增值酸
Shengjie Hao1, Meiyu Cong1, Hanwen Xu1
1State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|December 14, 2023
概括
将电化学二氧化碳减排与甲醇氧化相结合,有效地产生甲酸盐,与氧气演变相比,大大降低了能源消耗. 这种新方法为格式联合制作提供了稳定有效的途径.
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:
- 电化学二氧化碳减排 (CO2RR) 是减少大气二氧化碳的关键.
- 氧气演化反应 (OER) 与CO2RR相结合,耗费大量能量.
- 甲醇氧化反应 (MOR) 为CO2RR提供了一个替代的阳极反应.
研究的目的:
- 开发一种高效的配合系统,用于使用CO2RR和MOR进行格式共产.
- 调查氧气空缺和异构原子兴奋剂在增强催化活性中的作用.
- 为了比较CO2RR//MOR与CO2RR//OER的能源效率.
主要方法:
- 合成Bi/Bi2O3和Ni-Bi(OH) 3电催化剂.
- 对CO2RR和MOR性能进行电化学表征.
- 密度函数理论 (DFT) 计算以了解反应机制.
主要成果:
- 结合的CO2RR//MOR系统实现了格式生产,能量投入明显低 (7.26千瓦时/g格式) 比CO2RR//OER (13.67千瓦时/g格式).
- Bi/Bi2O3在一个广泛的潜能范围内显示了CO2RR的高格式法拉第效率 (>80%).
- Ni-Bi(OH) 3对MOR.表现出极好的法拉第效率 (>98%) 的形式.
- 两电极系统表现出了显著的稳定性,运行超过250小时,持续高法拉代效率.
结论:
- 使用工程化Bi/Bi2O3和Ni-Bi(OH) 3催化剂将CO2RR与MOR相结合,是一种能源效率高的形式联合生产策略.
- 在Bi/Bi2O3中空缺的氧气增强了OCHO*吸附,而Ni-Bi(OH) 3降低了MOR的速率决定步骤的能量屏障.
- 这种方法为传统的CO2RR//OER系统提供了有希望的替代方案,减少了能源消耗,并使有价值的化学合成成为可能.
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