Trace level of atomic copper in N-doped graphene quantum dots switching the selectivity from C1 to C2 products in CO electroreduction

被引：7

作者：

Lyu, X. ^{[1
,2
]}

Zhang, T. ^{[1
]}

Li, Z. ^{[1
]}

Jafta, C. J. ^{[2
]}

Serov, A. ^{[2
]}

Hwang, I. -H. ^{[3
]}

Sun, C. ^{[3
]}

Cullen, D. A. ^{[4
]}

Li, J. ^{[2
]}

Wu, J. ^{[1
]}

机构：

[1] Univ Cincinnati, Dept Chem & Environm Engn, Cincinnati, OH 45221 USA

[2] Oak Ridge Natl Lab, Electrificat & Energy Infrastruct Div, Oak Ridge, TN 37831 USA

[3] Argonne Natl Lab, Xray Sci Div Argonne, Lemont, IL 60439 USA

[4] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

来源：

MATERIALS TODAY CHEMISTRY | 2023年 / 29卷

关键词：

Trace copper; Graphene quantum dots; CORR; CO; 2; RR; Acetate; CARBON-DIOXIDE; ELECTROCHEMICAL REDUCTION; EFFICIENT; CU;

D O I：

10.1016/j.mtchem.2023.101398

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

To unravel the relationship between trace Cu on the metal-free catalysts toward CO/CO2 reduction reaction (CO/CO2RR), we investigated the effect of trace Cu loading in N-doped graphene quantum dots (NGQDs) on CO/CO2RR. A general trend is that increasing the Cu loading in NGQDs switches the selec-tivity from C1 (CH4) to C2 products in CORR. When 2.5 mu g/cm2 Cu with the atomic size is loaded on NGQDs, the selectivity shifts from 62% Faradaic efficiency (FE) of CH4 to 52% FE of C2 products in CORR. Further increasing the atomic Cu loading to 3.8 mu g/cm2 promotes the FE of C2 products to 78%. CO2RR requires one order of magnitude higher Cu loading than CORR to switch the selectivity from C1 to C2 products due to the low partial pressure of CO. This study clarifies the distinct impact of trace (ppm level) Cu on the activity/selectivity between CORR and CO2RR. (c) 2023 Elsevier Ltd. All rights reserved.

引用

页数：8

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