Multi-parameter study of CO2 electrochemical reduction from concentrated bicarbonate feed

Larrea, Carlos; Torres, Daniel Roberto Vega; Avilés–Moreno, Juan Ramón; Ocón, P.

doi:10.1016/j.jcou.2021.101878

Cited by 20 publications

(15 citation statements)

References 30 publications

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“…The electrochemical cell was operated galvanostatically at current densities of 50, 100, and 200 mA·cm −2 . The experiments were carried out at 20 °C and at 50 °C as it was proven that higher temperatures enhance CO selectivity [ 57 , 58 , 59 ]. The gas products that exited the cathodic side of the reactor were accumulated using a phase separator.…”

Section: Resultsmentioning

confidence: 99%

Strategies to Enhance CO2 Electrochemical Reduction from Reactive Carbon Solutions

2023

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CO2 electrochemical reduction (CO2ER) from (bi)carbonate feed presents an opportunity to efficiently couple this process to alkaline-based carbon capture systems. Likewise, while this method of reducing CO2 currently lags behind CO2 gas-fed electrolysers in certain performance metrics, it offers a significant improvement in CO2 utilization which makes the method worth exploring. This paper presents two simple modifications to a bicarbonate-fed CO2ER system that enhance the selectivity towards CO. Specifically, a modified hydrophilic cathode with Ag catalyst loaded through electrodeposition and the addition of dodecyltrimethylammonium bromide (DTAB), a low-cost surfactant, to the catholyte enabled the system to achieve a FECO of 85% and 73% at 100 and 200 mA·cm−2, respectively. The modifications were tested in 4 h long experiments where DTAB helped maintain FECO stable even when the pH of the catholyte became more alkaline, and it improved the CO2 utilization compared to a system without DTAB.

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Section: Resultsmentioning

confidence: 99%

Strategies to Enhance CO2 Electrochemical Reduction from Reactive Carbon Solutions

2023

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“…(e) Bicarbonate electrolysis performance of NaCl@Ni/Zn-6 and the state-of-the-art precious Ag-based catalysts. (Blue: Ag NPs; green: Ag NPs; purple: porous Ag foam; pink: Ag foam; light blue: Ag NPs; and light purple: Ag NPs).…”

Section: Resultsmentioning

confidence: 99%

MOF-Derived Ni Single-Atom Catalyst with Abundant Mesopores for Efficient Mass Transport in Electrolytic Bicarbonate Conversion

Yue

Xiong

et al. 2022

ACS Appl. Mater. Interfaces

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Direct electrolytic CO2 capture solution (e.g., bicarbonate), which bypasses the energy-intensive processes of CO2 desorption, offers a unique route for CO2 conversion to fuels or value-added chemicals. Nonprecious Ni single-atom catalysts (SACs) anchored on metal–organic frameworks (MOFs) possess abundant porous structures and exhibit a high selectivity for CO production. However, these MOF-derived Ni SACs are usually synthesized by a series of complex procedures, and their abundant micropores (<2 nm) also reduce the local reactant transport in the catalysts. Herein, we report a simple one-step pyrolysis method to prepare a MOF-derived Ni SAC that can efficiently boost bicarbonate conversion to CO. The abundant mesopores around 35.4 nm significantly enhance the transport of local reactants in the catalysts. At a high current density of 100 mA/cm2, the tailored catalyst shows 67.2% Faradaic efficiency of CO, which, to the best of our knowledge, exceeds the state-of-the-art precious Ag nanoparticle catalysts reported so far. This study highlights the significance of developing nonprecious catalysts for employment in large-scale bicarbonate electrolysis conversion devices.

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“…The role of bicarbonate in supplying CO 2 to the cathode is highly important for many different systems [38] . Some groups have even used highly concentrated bicarbonate electrolytes as CO 2 sources for formate production to avoid the need for a pure CO 2 feed stream [39,40] . Control 1 shows that even in the absence of a gaseous CO 2 feed, there is still CO formation from CO 2 supplied by the electrolyte.…”

Section: Resultsmentioning

confidence: 99%

“…[38] Some groups have even used highly concentrated bicarbonate electrolytes as CO 2 sources for formate production to avoid the need for a pure CO 2 feed stream. [39,40] Control 1 shows that even in the absence of a gaseous CO 2 feed, there is still CO formation from CO 2 supplied by the electrolyte. A trace amount of CO is even produced (À 0.19 mA cm geo À 2 at À 1.38 V RHE ) using bare Sigracet 29 BC carbon GDL, 100 % CO 2 feed, and 0.5 M KHCO 3 but no CO is detected for potentials less cathodic than À 1.38 V RHE (Figure S20).…”

Section: Electrochemical Performance Of Mono-and Bi-metallic Mà Nà C ...mentioning

confidence: 99%

Synergistic Electrocatalytic Syngas Production from Carbon Dioxide by Bi‐Metallic Atomically Dispersed Catalysts

et al. 2022

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The production of syngas by traditional processes such as steam methane reforming is energetically intensive and produces a large amount of CO2 emissions. In contrast, the electrochemical CO2 reduction reaction (CO2RR) enables the carbon neutral production of syngas at ambient conditions. Among non‐precious metal catalysts, metal‐nitrogen‐carbon electrocatalysts are inexpensive and highly selective towards syngas production. This study examined the selectivity of mono‐ and bi‐metallic (M−N−C, M=Fe, Mo or FeMo) electrocatalysts towards syngas production. The ratio of the CO : H2 in the syngas was tuned by modifying the ratio of the metallic precursors in the bi‐metallic FeMo−N−C catalysts, tailoring the catalysts’ selectivity towards the CO2RR or the hydrogen evolution reaction (HER). The catalyst synthesis temperature(s) were considered as they influence the catalyst morphology and activity. Further, the dependence of the ratio of CO : H2 in the syngas as a function of the potential was explored for the different bi‐metallic catalysts. This work showed that by tailoring both the ratio of Fe : Mo in the bi‐metallic catalyst and optimizing the reductive potential, a CO : H2 ratio between 0.25 to 5 was achievable. This study demonstrated a novel approach in which the ratio of the product syngas composition could be tailored in a single reaction, without the need for further downstream processing to reach a desired composition.

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Multi-parameter study of CO2 electrochemical reduction from concentrated bicarbonate feed

Cited by 20 publications

References 30 publications

Strategies to Enhance CO2 Electrochemical Reduction from Reactive Carbon Solutions

Strategies to Enhance CO2 Electrochemical Reduction from Reactive Carbon Solutions

MOF-Derived Ni Single-Atom Catalyst with Abundant Mesopores for Efficient Mass Transport in Electrolytic Bicarbonate Conversion

Synergistic Electrocatalytic Syngas Production from Carbon Dioxide by Bi‐Metallic Atomically Dispersed Catalysts

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