APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Xin Zhao,Genyan Hao,Qiang Fang,Xuelei Lang,Dandan Li,Dazhong Zhong,Jinping Li,Qiang Zhao
Copper (Cu) electrocatalysts for carbon dioxide reduction reaction (CO 2 RR) have attracted much attention due to their ability to produce high value-added C 2+ products (e.g., C 2 H 4 , C 2 H 5 OH, and n-propanol). However, achieving high selectivity of Cu electrocatalysts for C 2 H 5 OH in aqueous-based electrolytes remains a significant challenge. In this paper, we report Cu octahedra modified with low-coordinated Cu nanoclusters (Cu oct @Cu_NCs) as an efficient electrocatalyst for CO 2 RR to C 2 H 5 OH. Notably, the defect-site-rich Cu nanoclusters can promote the adsorption of *CO and increase the *CO coverage on Cu octahedra enclosed by Cu(1 1 1), thus promoting CO 2 RR to C 2 H 5 OH. We achieved a high Faradaic efficiency (FE) of 48.16 % for C 2 H 5 OH, and that of the C 2+ products is 83.31 % at −1.17 V vs. RHE. This study provides a surface nanostructured route for rationalizing efficient and selective copper electrocatalysts for CO 2 RR.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Microstructures
·
2025
·Vol. 5
·期 3
·N
·
IF 9
Kaiwen Tian,Yukang Fu,Inzimamul Haq,Shuangyang Kuang,Gaojie Xiong,Zeyuan Zhao,Tianyu Zhou,Jun Weng,Xiang Peng,Liwei Xiong
Aim: Zinc oxide (ZnO) is an n-type semiconductor with a wide bandgap, excellent electron mobility, and stable chemical characteristics, making it potentially applicable in the field of gas sensing. However, conventional ZnO-based gas sensors face challenges such as high operating temperatures and low sensitivity.Methods: In this paper, we first synthesized ZIF-8 with a rhombic dodecahedron structure using a room-temperature chemical precipitation method. By doping ZIF-8 with cobalt (Co) and exchanging gold ions, followed by calcination in air, we obtained a metal-organic framework (MOF) derived porous Au@Co-ZnO nanostructure.Results: This nanostructure retained the large specific surface area and porous characteristics of ZIF-8, while its gas sensing performance was significantly enhanced compared to the pure MOF-derived ZnO nanostructure, due to Co doping and gold nanoparticle modification. At an ethanol concentration of 100 ppm, the Au@Co-ZnO sample demonstrated its best performance at 140 °C, with a response value of 205.3. This result was 28.9 times higher compared to the pure ZnO sample, which showed a response value of 7.1 under identical conditions. Additionally, the optimal operating temperature was 40 °C lower than that of the pure ZnO sample (180 °C). Furthermore, the Au@Co-ZnO samples demonstrated good stability and selectivity for ethanol gas.Conclusion: The proposed MOF-derived porous Au@Co-ZnO nanostructures not only advance the application of MOF-derived materials in gas detection but also offer a novel approach for boosting the gas-sensing performance of other metal oxide materials.
研究领域:
材料科学
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纳米技术
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气体传感
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金属有机框架
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半导体传感器
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DOI
高影响因子
SENSORS
·
2017
·Vol. 17
·期 6
·1203
·
IF 2.677
Hongxiang Chen,Wei Jiang,Lianfeng Zhu,Youwei Yao
Amorphous indium gallium zinc oxide (a-IGZO) powder was prepared by typical solution-based process and post-annealing process. The sample was used as sensor for detecting C2H5OH, H2, and CO. Gas-sensing performance was found to be highly sensitive to C2H5OH gas in a wide range of concentration (0.5–1250 ppm) with the response of 2.0 towards 0.5 ppm and 89.2 towards 1250 ppm. Obvious difference of response towards C2H5OH, H2, and CO was found that the response e.g., was 33.20, 6.64, and 2.84 respectively at the concentration of 200 ppm. The response time and recovery time of was 32 s and 14 s respectively towards 200 ppm concentration of C2H5OH gas under heating voltage of 6.5 V.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xu-Chao Xia,Feng Cheng,Peng Sun,Amare Aregahegn Dubale,Hao Han,En-Tian Cui,Jun Song,Xiu-Li Yang,Ming-Hua Xie
Photocatalytic CO 2 reduction is a potential promising strategy for eliminating the global energy crisis and environmental issue. However, the complex reduction pathway leads to multiple possible products with limited efficiency, representing a great barrier for the further development. Herein, we report a Metal-organic framework (MOF) based heterostructure model for the efficient photoreduction of CO 2 with full controllable product selectivity between CO and C 2 H 5 OH. Novel core-sheath like MOF@TiO 2 heterostructures could be efficiently prepared by the layer-by-layer (LBL) growth of HKUST-1 onto Cu-embedded TiO 2 nanofibers (NFs), affording covalent heterointerfaces for efficient S-scheme charge separation and promising potential in photocatalytic activity regulation. By improving the CO 2 capture and retention via in situ amino-functionalization of HKUST-1, the photocatalytic CO production rate could be greatly promoted from 8.76 ± 0.84 to 43.46 ± 0.86 μmol g −1 h −1 accompanied by an enhancement of selectivity from 91.7 % to 98.3 %. Moreover, the product could be efficiently engineered into ethanol with a C 2 product selectivity of 94.2 % by introducing Cu nanoparticles (NPs) as the additional C C coupling site. The in situ FT-IR and DFT calculations reveal the mechanistic process and decisive role of amino-functionalization and Cu NPs deposition in photocatalytic activity engineering. This work highlights the key factors and significance of fabricating MOFs based heterostructures with tunable photocatalytic activity for achieving CO 2 neutralization.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2025
·
IF 8.9
Min Zhang,Weimin Wang,Jun Li,Xun Zhu,Qian Fu
Developing advanced electrocatalysts to convert CO 2 into liquid fuels such as C 2 H 5 OH is critical for utilizing intermittent renewable energy. The formation of C 2 H 5 OH, however, is generally less favored compared with the other hydrocarbon products from Cu-based electrocatalysts. In this work, an alkanethiol-modified Cu₂O nanowire array (OTT-Cu₂O) was constructed with asymmetric Cu sites consisting of paired Cu–O and Cu–S motifs to overcome previous limitations of C 2 H 5 OH electrosynthesis via CO 2 RR pathway. This catalyst achieves a high Faradaic efficiency of 45% for CO 2 -to-C 2 H 5 OH conversion at 300 mA/cm 2 , representing a more than two-fold enhancement over the Cu 2 O electrode. Mechanistic investigations reveal that the Cu–S site exhibits distinct C-binding capability that stabilizes key intermediates (*OCH 2 and *CO), in contrast to the O-affinitive Cu–O site. The asymmetric S–Cu–O configuration promotes thermodynamically favorable asymmetric C–C coupling between *CO and *OCH 2 , forming the critical CO–OCH₂ intermediate and facilitating C 2 H 5 OH production, as opposed to symmetric O–Cu–O sites that mainly generate HCOOH. This work offers an effective strategy for designing multi-active-site catalysts toward highly selective CO₂ reduction to C 2 H 5 OH and provides fundamental insight into the reaction mechanism.
研究领域:
电催化
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能源化学
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材料化学
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环境科学
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可持续能源
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表面科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2015
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IF 2.037
Rongrong Li,Jian Wan,Yingjie Zhang,Danxia Liang,Bin Zhang,Chenghong Li
The equilibrium solubility of sodium 1-naphthalenesulfonate in binary NaCl + water, Na2SO4 + water, and C2H5OH + water solvent mixtures was measured by a steady-state method at elevated temperatures from (278.15 to 323.15) K. The results of these data were correlated by a modified Apelblat equation. The dissolution enthalpy (ΔHd) and entropy (ΔSd) of sodium 1-naphthalenesulfonate in solutions of different mole fraction were obtained.
研究领域:
物理化学
·
热力学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Lidan Sun,Zhongxin Song,Mianrui Lin,JianZhao Peng,Yuanrui Li,Ruoyu Wei,Qingfeng Zhang,Jun Yu,Lei Zhang
The electrochemical reduction of carbon dioxide (CO2ER) to valuable C2+ chemicals has been demonstrated to be an effective and sustainable method using Cu-based catalysts. However, Cu catalysts still suffer from certain limitations, including high overpotential, low selectivity, and competitive hydrogen evolution. To achieve the valuable ethanol (C2H5OH) product from the CO2ER, a novel tandem catalyst featuring gradient doping of Cu in concave Pd nanoparticles (GD-PdCu1.8 NPs) was designed in this study. Electrochemical tests conducted on the GD-PdCu1.8 electrode reveal a nearly 100% faradaic efficiency (FE) for liquid products and a high FE of 40.0% for C2H5OH at the extremely low potential of −0.2 V versus the reversible hydrogen electrode (vs RHE). Furthermore, in-situ attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) and density functional theory (DFT) calculations provide insights into the underlying mechanism, indicating that gradient Cu doping in Pd can effectively facilitate the abundant formation of *CO, which then promotes the C–C asymmetric coupling step and ultimately leads to the production of C2H5OH with high selectivity. This study unveils the novel gradient doping of the tandem catalyst strategy to enhance multicarbon product selectivity at a relatively low overpotential for CO2ER, which can inform the rational catalyst design in the sustainable carbon cycle with high energy efficiency.
研究领域:
电化学
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催化
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材料科学
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
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