Atomic origins of high electrochemical CO<sub>2</sub>reduction efficiency on nanoporous gold

Zhang, Weiqing; He, Jia; Liu, Siyu; Niu, Wenxin; Liu, Pan; Zhao, Yang; Pang, Fangjie; Xi, Wei; Chen, Ming-Wei; Zhang, Wei; Pang, Su‐Seng; Ding, Yi

doi:10.1039/c8nr00642c

Cited by 46 publications

(49 citation statements)

References 46 publications

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“…34,35 Both the RT and LT np-Au films exhibit superior FE for CO (Figure 2a,b) relative to the planar Au film or Au foil ( Figure 2c,d) across the entire potential window studied. It has previously been shown that the residual Ag in the np-Au film is not the source of the high FE for CO. 18 We therefore attribute such significant improvements in catalytic selectivity to the prevalence of grain boundaries that exist within the np-Au structure relative to the planar Au film. Another factor that likely contributes to such marked improvements in selectivity is the ability of the np-Au film to support locally alkaline pH conditions within the porous network as protons are consumed during electrolysis.…”

Section: Acs Applied Energy Materialsmentioning

confidence: 99%

Nanoporous Gold as a Highly Selective and Active Carbon Dioxide Reduction Catalyst

Welch

DuChene

Tagliabue

et al. 2018

ACS Appl. Energy Mater.

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Electrochemical conversion of CO 2 into useful chemicals is a promising approach for transforming CO 2 into sustainably produced fuels and/or chemical feedstocks for industrial synthesis. We report that nanoporous gold (np-Au) films, with pore sizes ranging from 10 to 30 nm, represent promising electrocatalytic architectures for the CO 2 reduction reaction (CO 2 RR) due to their large electrochemically active surface area, relative abundance of grain boundaries, and ability to support pH gradients inside the nanoporous network. Electrochemical studies show that np-Au films support partial current densities for the conversion of CO 2 to CO in excess of 6 mA cm −2 at a Faradaic efficiency of ∼99% in aqueous electrolytes (50 mM K 2 CO 3 saturated with CO 2 ). Moreover, np-Au films are able to maintain Faradaic efficiency greater than 80% for CO production over prolonged periods of continuous operation (110 h). Electrocatalytic experiments at different electrolyte concentrations demonstrate that the pore diameter of nanoporous cathodes represents a critical parameter for creating and controlling local pH gradients inside the porous network of metal ligaments. These results demonstrate the merits of nanoporous metal films for the CO 2 RR and offer an interesting architecture for highly selective electrocatalysis capable of sustaining high catalytic currents over prolonged periods.

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Section: Acs Applied Energy Materialsmentioning

confidence: 99%

Nanoporous Gold as a Highly Selective and Active Carbon Dioxide Reduction Catalyst

Welch

DuChene

Tagliabue

et al. 2018

ACS Appl. Energy Mater.

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“…Nanoporous gold (npAu) has been shown to exhibit high selectivity for the CO 2 to CO conversion [3,4]. The material is prepared by a process called dealloying, that is, selective corrosion of the less noble components of an alloy which in the case of npAu typically is Ag from a Ag-Au alloy.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical CO₂ to CO reduction at high current densities using a nanoporous gold catalyst

Zhang

Biener

Kashi

et al. 2020

Materials Research Letters

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We report on integrating ultrathin monolithic nanoporous gold (npAu) catalyst coatings for CO 2 reduction in a large electrode area (25 cm 2) electrochemical membrane reactor with gas diffusion electrodes at 100 mA/cm 2. The CO Faraday efficiency increases with increasing thickness, from 65% to 75% and 80% for 1, 5, and 10 layers of npAu leaves where each npAu leaf layer is 100 nm thick. For the one npAu leaf layer configuration, this corresponds to an extremely high CO current density of 955 A/g gold thus demonstrating the potential for commercial applications. IMPACT STATEMENT By device level optimization of catalyst integration we significantly improved the utilization of gold catalysts for electrochemical CO 2 reduction to syngas at industrial relevant current densities of 100 mA/cm 2 .

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“…To differentiate, we call it quasi-HEAs. The as-fabricated nanoporous quasi-HEAs possess plentiful dislocations and defects between two neighboring solid solution areas and a high specific surface area, which may be applied in wide chemical fields [41][42][43]. The higher resolution characterization of quasi-HEAs needs to be examined in future work.…”

Section: Discussionmentioning

confidence: 99%

Nanoporous Quasi-High-Entropy Alloy Microspheres

Yang

Wang

et al. 2019

Metals

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High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

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Atomic origins of high electrochemical CO₂reduction efficiency on nanoporous gold

Cited by 46 publications

References 46 publications

Nanoporous Gold as a Highly Selective and Active Carbon Dioxide Reduction Catalyst

Nanoporous Gold as a Highly Selective and Active Carbon Dioxide Reduction Catalyst

Electrochemical CO₂ to CO reduction at high current densities using a nanoporous gold catalyst

Nanoporous Quasi-High-Entropy Alloy Microspheres

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Atomic origins of high electrochemical CO2reduction efficiency on nanoporous gold

Cited by 46 publications

References 46 publications

Nanoporous Gold as a Highly Selective and Active Carbon Dioxide Reduction Catalyst

Nanoporous Gold as a Highly Selective and Active Carbon Dioxide Reduction Catalyst

Electrochemical CO2 to CO reduction at high current densities using a nanoporous gold catalyst

Nanoporous Quasi-High-Entropy Alloy Microspheres

Contact Info

Product

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About

Atomic origins of high electrochemical CO₂reduction efficiency on nanoporous gold

Electrochemical CO₂ to CO reduction at high current densities using a nanoporous gold catalyst