当前位置: X-MOL 学术Nanoscale › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
AgPd nanoparticles for electrocatalytic CO2 reduction: bimetallic composition-dependent ligand and ensemble effects.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-08 , DOI: 10.1039/d0nr03203d
Meiyang Cui 1 , Grayson Johnson , Zhiyong Zhang , Shuang Li , Sooyeon Hwang , Xu Zhang , Sen Zhang
Affiliation  

Monodisperse AgPd nanoparticles (NPs) were synthesized and studied as an efficient catalyst for electrocatalytic CO2 reduction by modulating bimetallic compositions. The mechanistic studies, based on density functional theory (DFT) calculations and environmental diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) analysis, revealed that the incorporation of Ag in AgPd NPs can effectively weaken CO adsorption on all possible Pd surface sites (the ligand effects), and more importantly, disrupt the strongest multi-centered CO-binding sites (the ensemble effects). With properly tuned CO adsorption, which is ordinarily too strong over pure Pd, Ag15Pd85 NPs were found to be the best composition for the efficient production of CO. They deliver a unity conversion of CO2 to CO with a high mass activity of 15.2 mA mgmetal−1 at −0.8 V vs. the reversible hydrogen electrode (RHE) and high stability with minimal change in the CO faradaic efficiency (FECO) after 12 hours of operation.

中文翻译:

用于电催化二氧化碳还原的AgPd纳米颗粒:双金属成分依赖的配体和整体效应。

合成并研究了单分散AgPd纳米粒子(NPs)作为通过调节双金属成分来电催化还原CO 2的有效催化剂。根据密度泛函理论(DFT)计算和环境漫反射红外傅里叶变换光谱(DRIFTS)分析进行的机理研究表明,将Ag掺入AgPd NP中可以有效减弱CO在所有可能的Pd表面位点(配体)上的吸附效应),更重要的是,破坏最强的多中心CO结合位点(整体效应)。适当调整的CO吸附力通常比纯Pd强,Ag 15 Pd 85发现NP是有效生产CO的最佳成分。可逆氢电极(RHE)相比,它们在-0.8 V时可将CO 2统一转化为CO ,并具有15.2 mA mg金属-1的高质量活性。运行12小时后,CO法拉第效率(FE CO)的变化最小,因此具有很高的稳定性。
更新日期:2020-07-09
down
wechat
bug