单个原子密度依赖的CO2高效电还原
Fengwei Zhang1, Han Zhang1, Zhenhe Jia2
1Institute of Crystalline Materials, Institute of Molecular Science, Key Lab of Materials for Energy Conversion and Storage of Shanxi Province, School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, P. R. China.
单个原子的密度显著影响M-N-C催化剂的二氧化碳电还原 (CO2RR) 性能. 优化这种密度是提高从CO2中生产有价值的C1产品的效率的关键.
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:
- 具有M-N-x位点的过渡金属--碳 (M-N-C) 材料对二氧化碳电还原 (CO2RR) 有希望.
- 需要清楚地了解金属单原子密度如何影响CO2RR性能.
研究的目的:
- 为了研究单原子密度和CO2RR性能之间的关系.
- 在N-doped碳支器上设计和合成Ni单原子催化剂 (SAC).
主要方法:
- 在化石墨烯类碳 (Ni1@NG-900) 上制造Ni SAC,具有不同的Ni负载.
- 调整Ni单个原子 (DNi) 的密度从0.01到1.19原子nm-2.
- 对CO2RR性能进行电化学评估,包括对CO的法拉第效率 (FE_CO).
主要成果:
- FE_CO从13.4%增加到96.2%,因为DNi从0升至0.068 nm-2.0原子.
- 进一步增加DNi (高达1.19原子nm-2) 导致FE_CO边际改善至98.2%.
- 理论计算支持了实验结果,揭示了权衡关系.
结论:
- 单个Ni原子的密度是影响M-N-C催化剂CO2RR性能的一个关键因素.
- 优化DNi对于最大限度地提高CO2RR在C1产品合成中的效率至关重要.
- 这项研究提供了关于合理催化剂设计的见解,以改善二氧化碳的电还原.
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