通过碳化负载镍络合物的沸石咪唑骨架(ZIF-8)合成了一种高性能镍-氮-碳催化剂(Ni-NC)。通过透射电镜、BET、X射线光电子能谱仪对材料的多孔结构及金属-氮的配位情况进行表征。结果表明,合成的Ni-NC催化剂表现出优异的CO₂ ER活性和选择性:在较低的过电位490 mV下达到92.6%的CO法拉第效率,并在-0.7 V达到最大值94.6%,电流密度为20.6 mA/cm²,性能优于未负载镍的氮掺杂多孔碳,表明镍纳米颗粒在催化反应过程中起着至关重要的作用。此外,在10 h的电解中,CO法拉第效率可保持在90%以上。合成的Ni-NC催化剂在电催化还原CO₂为CO方面具有广阔的应用前景。

A high performance Ni-NC catalyst is synthesized through carbonizing zeolite imidazole framework-8 (ZIF-8) supported with nickel complex.The porous structure and the metal-nitrogen coordination of as-synthesized catalyst are characterized by means of transmission electron microscopy,BET and X-ray photoelectron spectroscopy.It is shown that this Ni-NC catalyst shows excellent activity and selectivity in electrocatalysis reduction of CO₂.Its CO Faradaic efficiency achieves 92.6% at a low overpotential of 490 mV,and reaches the maximum value of 94.5% at -0.7 V.The current density is 20.6 mA·cm^-2.It is shown that this Ni-NC catalyst has a higher performance than the nitrogen-doped porous carbon without Ni,indicating that Ni nanoparticle plays a crucial role in the catalytic process.In addition,the CO Faradaic efficiency of the catalyst can be maintained over 90% during 10 h of electrolysis.These results indicate that the synthesized Ni-NC catalyst has a broad application prospect in electrocatalytic reduction of CO₂ to CO.

曹泽宇(1997-),男,硕士研究生,研究方向为CO₂还原电催化剂,c1306390549@163.com。