Preparation of a silver electrode with a three-dimensional surface and its performance in the electrochemical reduction of carbon dioxide

Qiu, Jianping; Tang, Juntao; Shen, Jie; Wu, Cuiwei; Qian, Mengqian; He, Zhiqiao; Chen, Jianmeng; Song, Shuang

doi:10.1016/j.electacta.2016.03.182

Cited by 34 publications

(11 citation statements)

References 49 publications

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“…The Ag NWs synthesized from the polyol method were employing polyvinylpyrrolidone (PVP) as the capping agent; therefore, the Ag NWs is actually a composite of Ag NWs coated with PVP on the surface. ,, For Ag plate, the C/O species should derive from the partial oxide and carbonate or surface-adsorbed impurities. These complex surface compositions may respond by converting CO 2 into different products …”

Section: Resultsmentioning

confidence: 99%

Ultrathin Ag Nanowires Electrode for Electrochemical Syngas Production from Carbon Dioxide

Wang

et al. 2018

ACS Sustainable Chem. Eng.

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The mass production of silver nanowires (Ag NWs) with ultrathin diameter (∼35 nm) and a high aspect ratio (>1000) is prepared from an optimized polyol solution. The Ag NWs possess several promising advantages, including good conductivity and excellent film formability, and have already been used to fabricate a large area flexible Ag NWs-based electrode through a simple drop-casting method. The Ag NWs electrode displayed good activity to convert carbon dioxide (CO2) to carbon monoxide (CO) in high Faradaic efficiency (FE) of ∼80% under low working potential (−0.9 V vs reversible hydrogen electrode (RHE)), and at the same time, the fraction of CO/H2 can be tuned from 1/1 to 4/1. A small amount of HCOOH (FE: 2.6–5.6%) was also measured as a byproduct in liquid phase. The constant working current density and CO FE recovered superstability of the Ag NWs electrode. The high-resolution transmission electron microscopy (TEM) recovered the {111} facet exposed to the surface contribuing to the effective performance. Ag NWs with larger diameter (70 nm) and Ag plate electrode were also evaluated under the same condition, where formic acid (HCOOH) was also detected besides CO as another main product. Combined with easy fabrication, low cost, high selectivity, and excellent stability, Ag NWs based electrode is promising for further application in larger scale for syngas production and other electrocatalysis.

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Section: Resultsmentioning

confidence: 99%

Ultrathin Ag Nanowires Electrode for Electrochemical Syngas Production from Carbon Dioxide

Wang

et al. 2018

ACS Sustainable Chem. Eng.

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“…Various methods, such as the chemical method, , and electrocatalytic, − photocatalytic, and photoelectrocatalytic reductions, , have been used for conversion of CO 2 into valuable chemicals. Among these methods, electrocatalytic reduction of CO 2 has received more attention − because the reduction rate can be easily controlled by applied potentials, and the product selectivity is able to select from various electrode materials. − The preparation and stability of catalysts, product selectivity, and reduction mechanism for CO 2 electroreduction were reviewed extensively and deeply by Qiao et al, who proposed research directions for CO 2 electroreduction in the future that are very significant.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Reduction of Carbon Dioxide on Nanosized Fluorine Doped Tin Oxide in the Solution of Extremely Low Supporting Electrolyte Concentration: Low Reduction Potentials

Qiu

et al. 2018

ACS Appl. Energy Mater.

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Fluorine doped tin oxide (FTO) has been prepared via the direct chemical reaction of tin oxide powders and hydrofluoric acid at room temperature. The image of FTO displays a sphere-like structure with an average diameter of 40−100 nm. The spectra of X-ray photoelectron spectroscopy (XPS) demonstrate that fluorine is doped into SnO 2 . A welldefined reduction peak at −0.50 V (vs SCE) is detected on the cyclic voltammogram (CV) of the nanosized FTO (n-FTO) electrode in CO 2 -saturated 3.6 × 10 −4 μM H 2 SO 4 solution of pH 5.5, which is strong evidence for the electrochemical reduction of CO 2 . This result indicates that the n-FTO electrode in such an extremely low supporting electrolyte concentration exhibits good electrocatalytic ability toward CO 2 reduction under lower potentials. On the basis of reduction peak current as a function of scan rate, the reduction of CO 2 is first performed via adsorption of CO 2 on the n-FTO electrode surface, and then CO 2 is reduced. The product solution obtained under a constant potential of −0.90 V (vs Ag/AgCl with saturated KCl solution) is used for analysis of UV−vis spectra, 1 H NMR, and gas chromatography; the results demonstrate the presence of formic acid and methanol in the product solution, but formic acid is a main product. Faradaic efficiency for formic acid is 82.3%.

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“…Among them, silverbased catalysts show high selectivity for CO production with relatively high activity and low cost [13][14][15]. Promotion of the reaction kinetics and selectivity has been achieved by morphology tuning, size engineering, as well as alloying [16][17][18][19][20]. However, improved ECR performance does not necessarily mean the enhancement of intrinsic activity correlated to the specific activity normalizd by electrochemically active surface areas (ECSAs) in the non-Faradaic voltage range, which calls for alternative strategies to acquire enhanced performance from the fundemantal aspects [21][22][23][24][25].…”

Section: Instructionmentioning

confidence: 99%

In situ construction of thiol-silver interface for selectively electrocatalytic CO2 reduction

Chen

Hao

et al. 2021

Nano Res.

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Electrochemical CO 2 reduction (ECR) is one of the most effective methods to obtain carbonaceous chemicals and reduce greenhouse gases passingly under the ambient condition. However, efficient electrocatalysts featured with high selectivity and stability are still lacking. A novel molecule-mediated Ag electrocatalyst with capped thiols is rationally designed for high-performance ECR. The thiol-capped and carbon-supported Ag nanostructures (Ag-TC) are formed by in situ electrochemical reduction from three-dimentional (3D) Ag-thiol metal-organic compound with cysteine as the anchor agent and carbon source. Ag-TC exhibits high selectivity and stability for CO 2 conversion to CO (86.7%), which is more catalytically active than that of common Ag nanoparticles. The function of thiols for ECR is proved by replacing cysteine with alanine without thiol group. Meanwhile, alternatively replacing and removing the surface molecules on the Ag foil further demonstrate the effct of thiols. This work enlightens the promise of in situ construction method for molecule capped metal electrocatalyst towards selective and stable ECR.

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Preparation of a silver electrode with a three-dimensional surface and its performance in the electrochemical reduction of carbon dioxide

Cited by 34 publications

References 49 publications

Ultrathin Ag Nanowires Electrode for Electrochemical Syngas Production from Carbon Dioxide

Ultrathin Ag Nanowires Electrode for Electrochemical Syngas Production from Carbon Dioxide

Electrocatalytic Reduction of Carbon Dioxide on Nanosized Fluorine Doped Tin Oxide in the Solution of Extremely Low Supporting Electrolyte Concentration: Low Reduction Potentials

In situ construction of thiol-silver interface for selectively electrocatalytic CO2 reduction

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