稀土离子掺杂调控MIL-101的电子结构促进电催化氮还原反应

Rare earth ion doping regulates the electronic structure of MIL-101 to promote electrocatalytic nitrogen reduction reaction

电催化氮还原反应(electrocatalytic nitrogen reduction reaction,eNRR)被认为是在环境条件下生产低浓度NH_(3)/NH_(4)^(+)的有效策略,而设计合适的催化剂是高效驱动eNRR的关键。本研究采用水热法制备MIL-101催化剂,研究水热温度和Gd元素掺杂对MIL-101催化剂e NRR性能的影响。结果表明:150-MIL-101具有最高的结晶度及e NRR性能(氨产率为11.5μg/(h·mg),法拉第效率为30.5%)。MIL-101-0.5Gd表面下凹,暴露了内部粗糙孔结构,催化剂表观活性提高,同时氧空位浓度的增加可优化催化剂的特性活性,其在0.1mol/L LiClO_(4)电解质、-1.3 V电位下的氨产率和法拉第效率分别为16.7μg/(h·mg)和37.6%,优于无掺杂150-MIL-101,且催化剂具有较好的长期稳定性。

Electrocatalytic nitrogen reduction reaction(eNRR)is considered as an effective strategy for producing NH_(3)/NH_(4)^(+)with low concentrations under environmental conditions,and designing appropriate catalysts is the key to efficiently driving eNRR.This study used a hydrothermal method to prepare MIL-101 catalyst and investigated the effects of hydrothermal temperature and Gd element doping on the eNRR performance of MIL-101 catalyst.The results show that 150-M-101 has the highest crystallinity and eNRR performance(NH3 yield of 11.5μg/(h·mg),Faraday efficiency of 30.5%).The surface of MIL-101-0.5Gd is concave,exposing the internal rough pore structure,improving the apparent activity of the catalyst.At the same time,the increase of oxygen vacancy concentration optimizes the characteristic activity of the catalyst,the NH3 yield and Faraday efficiency at 0.1 mol/L LiClO_(4) electrolyte and-1.3 V potential are 16.7μg/(h·mg)and 37.6%,respectively,which are better than undoped 150-MIL-101.The catalyst also has good long-term stability.