Hierarchically porous Cu/Zn bimetallic catalysts for highly selective CO2 electroreduction to liquid C2 products

Su, Xingsong; Sun, Yuanmiao; Liu, Jin; Zhang, Lei; Yang, Yue; Kerns, Peter; Liu, Ben; Li, Shuzhou; He, Jie

doi:10.1016/j.apcatb.2020.118800

Cited by 144 publications

(88 citation statements)

References 80 publications

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“…As shown in Table 1 (Figure 1 c), indicating the absence of a Cu-Zn bond in the bimetallic samples. [34] Figure 2 shows the morphologies of the as-prepared samples at a low and a high magnification with images at an even higher magnification in the insets. As shown in Figure 2 a, the particles in the Cu sample have a wide size distribution from nano to submicron scale (e.g., particles A and B).…”

Section: Resultsmentioning

confidence: 99%

“…It is commonly considered that the comparison of the current densities obtained in Ar-and CO 2 -saturated electrolytes is indicative of the selectivity of a Cu-based electrode. [23,34] A catalyst that produces a higher current density in CO 2 electrolyte than that in a N 2 one is usually favorable for the CO 2 RR with respect to the HER at the corresponding applied potential. Interestingly, each Cu-Zn electrode shows a higher current density in CO 2 electrolyte compared with that in the N 2 one at potentials from À0.8 V to À1.1 V, as displayed in Figure S6 (in the Supporting Information).…”

Section: Electrochemical Characterizations and Product Analyses Of Thmentioning

confidence: 99%

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Coupled Copper–Zinc Catalysts for Electrochemical Reduction of Carbon Dioxide

et al. 2020

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A catalyst plays a key role in the electrochemical reduction of CO2 to valuable chemicals and fuels. Hence, the development of efficient and inexpensive catalysts has attracted great interest from both the academic and industrial communities. In this work, low‐cost catalysts coupling Cu and Zn are designed and prepared with a green microwave‐assisted route. The Cu to Zn ratio in the catalysts can be easily tuned by adjusting the precursor solutions. The obtained Cu–Zn catalysts are mainly composed of polycrystalline Cu particles and monocrystalline ZnO nanoparticles. The electrodes with optimized Cu–Zn catalysts show enhanced CO production rates of approximately 200 μmol h−1 cm−2 with respect to those with a monometallic Cu or ZnO catalyst under the same applied potential. At the bimetallic electrodes, ZnO‐derived active sites are selective for CO formation and highly conductive Cu favors electron transport in the catalyst layer as well as charge transfer at the electrode/electrolyte interface.

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Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Characterizations and Product Analyses Of Thmentioning

confidence: 99%

Coupled Copper–Zinc Catalysts for Electrochemical Reduction of Carbon Dioxide

et al. 2020

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“…In a word, the finely engineered alloy catalysts can greatly promote the formation of liquid C2 and suppress the H 2 evolution. [ 144 ]…”

Section: Electrocatalytic Co2 Conversionmentioning

confidence: 99%

The Active Sites Engineering of Catalysts for CO₂ Activation and Conversion

Tang

Wang

2020

Solar RRL

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Catalytic CO2 conversion is considered to be a promising way to simultaneously reduce greenhouse gas emission and realize carbon resource recycling. Several typical reactions including hydrogenation, carboxylation, carboxylic cyclization, and cycloaddition have been extensively studied for yielding high value‐added products. During the process of CO2 conversion, the introduction of light energy and electricity will dramatically lower the energy consumption for CO2 activation so that the whole reaction can efficiently take place at room temperature and atmospheric pressure. For traditional chemical, photochemical, and electrochemical conversions, the processes can be effectively promoted by the rational engineering of active sites on the catalysts. Herein, the most recent advances on the active site engineering of catalysts involving metal or alloy sites, Lewis sites, defect sites, and elemental doping sites are focused on. The influencing mechanisms on the CO2 activation and selective conversion are further discussed according to the structural properties and the interactions with different active sites. Finally, a brief perspective on the future opportunities and challenges in this field is also presented. Researchers who attempt to explore more efficient catalysts for CO2 activation and selective conversion will be guided.

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“…[14] Copper (Cu) has been proved to be the only active metal for electro-reduction of CO 2 to C 2 + products owing to its optimized binding energy with *CO, as the key intermediate to form > 2e À reduction products. [15][16][17] Nevertheless, the active sites of bulk Cu catalysts showed high selectivity to H 2 and HCOOH, resulting in an inferior FEs of C 2 + products. [18][19] Up to now, various strategies have been developed to improve the selectivity of multiple carbon products on Cu-based catalysts, including controlling the copper states, [11,[20][21][22] introducing a second metal, [23][24] forming grain boundaries, low coordination sites, [25][26][27] and regulating the exposed facet.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Ethylene Formation from Carbon Dioxide Reduction through Sequential Catalysis on Au Decorated Cubic Cu₂O Electrocatalyst

Cao

et al. 2021

Eur J Inorg Chem

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Electrochemical reduction of carbon dioxide to fuels has been recognized as a perspective way to address the environmental and energy issues. Herein, the novel Au decorated Cu 2 O electrocatalysts were synthesized via the galvanic replacement reaction and the successive pre-reduction by linear voltammetry (LSV) method. In contrast to Cu 2 O, CO formation became dominant over HCOOH and H 2 on Au x Cu 2 O, and a remarkably enhanced selectivity of C 2 H 4 was obtained beyond À 1.1 V vs. RHE. Among them, Au 0.02 Cu 2 O exhibited the highest Faraday efficiency (FE) of C 2 H 4 of 24.4 % at À 1.3 V vs. RHE, which was as high as 2~2.5 and 5 times of those on other two Au x Cu 2 O and bare Cu 2 O, respectively. Meanwhile, it is demonstrated that the optimal ratio of Au/Cu was essential for effective sequential catalysis between Au and Cu 2 O to enhance CÀ C coupling. Furthermore, the effect of copper states resulting from different pre-reduction methods on the selectivity of C 2 H 4 was explored. A half decrease of C 2 H 4 FE was observed on HPR-Au 0.02 Cu 2 O (high potential reduced) relative to the LSV reduced Au 0.02 Cu 2 O, which was ascribed to the different content of Cu 0 and residual Cu + in two catalysts. Our results demonstrate an effective approach to construct Cu 2 O based bimetallic catalysts for ethylene formation from CO 2 .

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Hierarchically porous Cu/Zn bimetallic catalysts for highly selective CO2 electroreduction to liquid C2 products

Cited by 144 publications

References 80 publications

Coupled Copper–Zinc Catalysts for Electrochemical Reduction of Carbon Dioxide

Coupled Copper–Zinc Catalysts for Electrochemical Reduction of Carbon Dioxide

The Active Sites Engineering of Catalysts for CO₂ Activation and Conversion

Enhanced Ethylene Formation from Carbon Dioxide Reduction through Sequential Catalysis on Au Decorated Cubic Cu₂O Electrocatalyst

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Hierarchically porous Cu/Zn bimetallic catalysts for highly selective CO2 electroreduction to liquid C2 products

Cited by 144 publications

References 80 publications

Coupled Copper–Zinc Catalysts for Electrochemical Reduction of Carbon Dioxide

Coupled Copper–Zinc Catalysts for Electrochemical Reduction of Carbon Dioxide

The Active Sites Engineering of Catalysts for CO2 Activation and Conversion

Enhanced Ethylene Formation from Carbon Dioxide Reduction through Sequential Catalysis on Au Decorated Cubic Cu2O Electrocatalyst

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Product

Resources

About

The Active Sites Engineering of Catalysts for CO₂ Activation and Conversion

Enhanced Ethylene Formation from Carbon Dioxide Reduction through Sequential Catalysis on Au Decorated Cubic Cu₂O Electrocatalyst