Capture and electroreduction of CO2 using highly efficient bimetallic Pd-Ag aerogels paired with carbon nanotubes

被引：31

作者：

Abdinejad, Maryam ^{[1
]}

Ferrag, Celia ^{[1
,2
]}

Hossain, M. Nur ^{[1
]}

Noroozifar, Meissam ^{[1
]}

Kerman, Kagan ^{[1
,2
]}

Kraatz, Heinz Bernhard ^{[1
,2
]}

机构：

[1] Univ Toronto Scarborough, Dept Phys & Environm Sci, 1265 Mil Trail, Toronto, ON M1C 1A4, Canada

[2] Univ Tomnto, Dept Chem, 80 St George St, Toronto, ON M5S 3H6, Canada

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2021年 / 9卷 / 21期

基金：

加拿大自然科学与工程研究理事会;

关键词：

SELECTIVE ELECTROCATALYTIC REDUCTION; ENHANCED ELECTROCHEMICAL REDUCTION; HIGH-PERFORMANCE ELECTROCATALYST; HYDROGEN-STORING MATERIALS; SINGLE-CRYSTAL ELECTRODES; FORMIC-ACID; GOLD NANOPARTICLES; COPPER ELECTRODES; OXYGEN REDUCTION; SYNTHESIS GAS;

D O I：

10.1039/d1ta01834e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The rational design of efficient catalysts for electrochemical CO2 reduction is a critical step towards achieving industry-ready electrolyzer systems. Noble metal aerogels have emerged as state-of-the-art catalysts that play a crucial role in several applications. Here, we report bimetallic PdxAgy aerogels that have been optimized by modulating the Pd/Ag ratio for the capture and selective electroreduction of CO2. Pd0.67Ag0.33 exhibited the greatest ability to reduce CO2 to CO with faradaic efficiency (FE): 84% and current density (j): -23 mA cm(-2) at -0.8 V vs. RHE in 0.1 M NaHCO3. Using a carbon nanotube solid support (Pd0.67Ag0.33/CNT), we could further enhance the FE to 91% with a higher current density of -38 mA cm(-2) at lower overpotential (-0.7 V vs. RHE). This remarkable catalytic activity is higher than that of monometallic Pd (FE: 43%, j: -3.4 mA cm(-2)) and Ag (FE: 68%, j: -2.6 mA cm(-2)) aerogels at -0.8 V vs. RHE. Using bimetallic aerogels provides an effective strategy that could inspire the design of new catalysts for a variety of applications.

引用

页码：12870 / 12877

页数：8

共 117 条

[41] Calculation for the cathode surface concentrations in the electrochemical reduction of CO2 in KHCO3 solutions [J].