破解K+度限制在Cu和针对于酸性电催化CO2的减少多碳产品
Xin Zi1, Yajiao Zhou1, Li Zhu2
1Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, School of Physics, Central South University, Changsha, 410083, Hunan, P. R. China.
Angewandte Chemie (International ed. in English)
|August 28, 2023
概括
铜纳米针通过创建超高的局部离子度来促进电催化CO2降低到多碳产品,克服可溶性极限以实现高效的转化.
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:
- 在酸性介质中,用电催化方法将二氧化碳 (CO2 RR) 减少为多碳产品 (C2+),这对于气候和能源解决方案至关重要.
- 挑战包括竞争的演化反应 (HER) 和C2+产品的低选择性.
- 当地高离子 (K+) 度可以增强C-C合,但由于溶解性而受到限制.
研究的目的:
- 为了克服增强酸性CO2的K+可溶性极限,RR.
- 为了实现高效率和C2+产品的选择性,使用Cu nanoneedles.
主要方法:
- 使用Cu nanoneedles作为酸性电解质 (3M KCl,pH=1) 中的电催化剂.
- 达到超高的局部K+度,超过散装可溶性极限.
- 测量C2+ (FE_C2+) 和单通碳效率 (SPCE) 的法拉第效率.
主要成果:
- 纳针诱导了4.22M的超高局部K+度,超过了3.5M的可溶性极限.
- 在1400mA.cm-2.2的高电流密度下,达到90.69±2.15%的FE_C2+
- 在CO2流速为7scccm时,达到25.49±0.82%的SPCE.
结论:
- 甲针有效地打破了K+的溶解度极限,使得高效的酸性CO2RR成为可能.
- 这一战略显著提高了C2+的选择性和生产率.
- 证明了可扩展的二氧化碳转化技术的有希望的途径.
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