A focus on the electrolyte: Realizing CO2 electroreduction from aqueous solution to pure water

Zhao, Jia; Liu, Yuanwei; Li, Wenjing; Wen, Chun Fang; Fu, Huai Qin; Yuan, Hai Yang; Liu, Peng Fei; Yang, Hua Gui

doi:10.1016/j.checat.2022.11.010

Cited by 19 publications

(10 citation statements)

References 178 publications

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“…The CO 2 RR reaction is typically facilitated by an increase in the pH of the solution . We thus investigated the CO 2 RR activity of Y 2 Cu 2 O 5 by substituting the electrolyte from 0.5 M KHCO 3 to 1 M KOH (Figure e–g and Figure S10).…”

Section: Resultsmentioning

confidence: 99%

Bimetallic Oxide of Y₂Cu₂O₅ for Electroreduction of CO₂ to Syngas

Wu,

Liu,

et al. 2024

Energy Fuels

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The incorporation of guest elements into Cu-based bimetallic oxides has been proven as an effective way to modify the electronic structure and reactivity of Cu active sites. Here, the Y element was chosen as the guest element to modulate the electronic structure of Cu and alter its performance for electrochemical CO 2 reduction reaction (CO 2 RR). Y 2 Cu 2 O 5 , a high-crystallinity Cu-based bimetallic oxide, was synthesized via the sol−gel method. For pure-phase CuO and Y 2 O 3 controls, the selectivity of H 2 significantly exceeded that of CO. While Y and Cu combined in equal molar weights to form Y 2 Cu 2 O 5 , a notable enhancement in the CO selectivity was observed, resulting in a CO/H 2 ratio of approximately 1:1. These results prove that under the influence of Y, the electronic structure of Cu exhibits heightened CO selectivity. When the electrolyte solution was substituted with 1 M KOH, the CO/H 2 ratio achieved was about 2:1, indicating that the ratio of syngas can be adjusted by changing the concentration or type of electrolyte. This study explores the electronic modulation of a guest element in Cu-based bimetallic oxides and clarifies the beneficial influence of the Y element on the activity of Cu sites, which provides a novel approach for designing and regulating the activity of catalyst active sites.

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Section: Resultsmentioning

confidence: 99%

Bimetallic Oxide of Y₂Cu₂O₅ for Electroreduction of CO₂ to Syngas

Wu,

Liu,

et al. 2024

Energy Fuels

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“…These findings indicate that, aside from issues such as the pH decrease of the KOH solution, the degradation of the GDE may be the main factor contributing to the instability of CO 2 electrolyzers. [18][19] It is important to note that this novel biohybrid battery was characterized by a long discharging time, making it suitable for water biotoxicity monitoring. Once the cell voltage reached a stable state, a specific volume of methanal solution (Figure 3a) and Cu 2 + solution (Figure 3b) was added to the microbial electrochemical reactors, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…[18] Several promotion effects of alkali cations have been proposed for CO 2 RR, including modifying the local electric field, buffering interfacial pH, altering water structure, and influencing reaction intermediates. [19] Furthermore, the presence of free ions can initiate the electrochemical reaction on the inner surface by facilitating ion conduction. [20] However, the using of extremely high catholyte KOH concentration might restrict the stability of CO 2 electrolysers, which is prone to the formation of carbonate salts.…”

Section: Methodsmentioning

confidence: 99%

Super‐fast Charging Biohybrid Batteries through a Power‐to‐formate‐to‐bioelectricity Process by Combining Microbial Electrochemistry and CO₂ Electrolysis

Chu,

Jiang,

Wang

et al. 2023

Angew Chem Int Ed

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Extensive study on renewable energy storage has been sparked by the growing worries regarding global warming. In this study, incorporating the latest advancements in microbial electrochemistry and electrochemical CO2 reduction, a super‐fast charging biohybrid battery was introduced by using pure formic acid as an energy carrier. CO2 electrolyser with a slim‐catholyte layer and a solid electrolyte layer was built, which made it possible to use affordable anion exchange membranes and electrocatalysts that are readily accessible. The biohybrid battery only required a 3‐minute charging to accomplish an astounding 25‐hour discharging phase. In the power‐to‐formate‐to‐bioelectricity process, bioconversion played a vital role in restricting both the overall Faradaic efficiency and Energy efficiency.The CO2 electrolyser was able to operate continuously for an impressive total duration of 164 hours under Gas Stand‐By model, by storing N2 gas in the extraction chamber during stand‐by periods. Additionally, the electric signal generated during the discharging phase was utilized for monitoring water biotoxicity. Functional genes related to formate metabolism were identified in the bioanode and electrochemically active bacteria were discovered. On the other hand, Paracoccus was predominantly found in the used air cathode. These results advance our current knowledge of exploiting biohybrid technology.

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“…In particular, a significant decrease in selectivity occurs at high current densities because the supply of CO 2 does not cover demand. 30–32 In addition, the catalyst is easily dislodged when immersed in the electrolyte, and stability tests cannot be run for a long time, often only a dozen hours. 33,34 Therefore, H-type cells are only suitable for laboratory-scale research and cannot be scaled up for industrial applications.…”

Section: Types and Importance Of Scalable Co2 Electrolyzersmentioning

confidence: 99%

Advances and challenges in scalable carbon dioxide electrolysis

Sun,

Fu,

Liu

et al. 2023

EES. Catal.

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A focus on the electrolyte: Realizing CO2 electroreduction from aqueous solution to pure water

Cited by 19 publications

References 178 publications

Bimetallic Oxide of Y₂Cu₂O₅ for Electroreduction of CO₂ to Syngas

Bimetallic Oxide of Y₂Cu₂O₅ for Electroreduction of CO₂ to Syngas

Super‐fast Charging Biohybrid Batteries through a Power‐to‐formate‐to‐bioelectricity Process by Combining Microbial Electrochemistry and CO₂ Electrolysis

Advances and challenges in scalable carbon dioxide electrolysis

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A focus on the electrolyte: Realizing CO2 electroreduction from aqueous solution to pure water

Cited by 19 publications

References 178 publications

Bimetallic Oxide of Y2Cu2O5 for Electroreduction of CO2 to Syngas

Bimetallic Oxide of Y2Cu2O5 for Electroreduction of CO2 to Syngas

Super‐fast Charging Biohybrid Batteries through a Power‐to‐formate‐to‐bioelectricity Process by Combining Microbial Electrochemistry and CO2 Electrolysis

Advances and challenges in scalable carbon dioxide electrolysis

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Bimetallic Oxide of Y₂Cu₂O₅ for Electroreduction of CO₂ to Syngas

Bimetallic Oxide of Y₂Cu₂O₅ for Electroreduction of CO₂ to Syngas

Super‐fast Charging Biohybrid Batteries through a Power‐to‐formate‐to‐bioelectricity Process by Combining Microbial Electrochemistry and CO₂ Electrolysis