Efficient Electrocatalytic CO2 Reduction to CO by Tuning CdO-Carbon Black Interface

doi:10.7503/cjcu20220317

Abstract

Abstract:

Highly efficient electrochemical CO₂ reduction（ECR） was realized by tuning the interface between CdO and carbon black（CB）. CdO/CB composites with different amounts of CdO and CB were prepared simply through ultrasonication. The obtained CdO/CB was characterized by a series of techniques including XRD， XPS， and TEM to reveal its composition and morphology. The ECR performance of CdO/CB composites was tested in an H-type cell. An overall ECR faradaic efficiency（FE） as high as 92.7% was achieved at -1.0 V（versus reversible hydrogen electrode） over CdO/CB with 20%（mass fraction） of CdO， in stark contrast to 69.5% over bare CdO. The highest CO FE reached 87.4%. Further control experiments and kinetic studies suggested that the enhanced catalytic activity of CdO/CB was attributed to the large contact area and interface between CdO and CB. In addition， CdO/CB exhibited stable CO FE for at least 10 h of ECR reaction. The easily accessible CdO/CB composites with tunable interface provide a feasible avenue for efficient ECR over economic electrocatalysts.

Key words: Electrochemical carbon dioxide reduction, Carbon monoxide, Cadmium oxide, Carbon black, Electrocatalysis

CLC Number:

O646

TrendMD:

WANG Lijun, LI Xin, HONG Song, ZHAN Xinyu, WANG Di, HAO Leiduan, SUN Zhenyu. Efficient Electrocatalytic CO₂ Reduction to CO by Tuning CdO-Carbon Black Interface[J]. Chem. J. Chinese Universities, 2022, 43(7): 20220317.

Figures/Tables 4

Fig.1 XRD patterns of CdO and 20%CdO/CB(A), wide?scan(B), Cd3d (C) and O1s(D) XPS spectra of 20%CdO/CB

Fig.2 TEM image of 20%CdO/CB(A), TEM image of CdO(B) and corresponding EDS elemental maps of C(C), O(D) and Cd(E), HRTEM image of 20%CdO/CB, showing the interface between CdO and CB(F) and HRTEM image of CdO(G)

Fig.3 Linear sweep voltammetry(LSV) results of CdO and 20%CdO/CB in Ar or CO2 saturated 0.1 mol/L KHCO3 solution with a scan rate of 5 mV/s(A), ECR FEs(B), H2 FEs(C), and CO partial geometric current densities(D) of CdO and 20%CdO/CB, production rates of CO at different potentials over CdO and 20%CdO/CB(E) and CO cathodic energy efficiency(EE) of CdO and 20%CdO/CB(F)

Fig.4 CO partial mass current densities of CdO and various CdO/CB samples with different CdO mass fraction(A), ECR FEs of CB, CdO and CdO/CB with different CdO mass fraction(B), ECR FEs optimized by modulating the adding sequence of CdO or CB, and mixing CdO and CB under ultrasonication or without ultrasonication at a constant CdO mass fraction of 20%(C), Tafel plots for CO production(D) and EIS spectra of CdO and 20%CdO/CB(E), current density and CO FE of 20%CdO/CB during 10 h of continuous electrolysis at -1.0 V(F)(E) The inset gives the equivalent circuit employed for fitting the data, where Rs denotes the combination of the resistance of electrodes and electrolyte, CPE and Rct denote the capacitance and charge transfer resistance of working electrode?electrolyte interface, respectively.

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Efficient Electrocatalytic CO₂ Reduction to CO by Tuning CdO-Carbon Black Interface

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