Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Congcong Piao,Yitong Lin,Zhiyu Liu,Liang Chen,Jianhe Tang,Dawei Fang,Jun Wang
ABSTRACT Several novel Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalysts are prepared via chemical reduction and calcination methods to degrade organic dyes containing N and S and convert NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 . Sodium borohydride (NaBH 4 ), ascorbic acid (C 6 H 8 O 6 ) and hydrazine hydrate (N 2 H 4 ·H 2 O) are selected as reductants to deposit CuPd alloy nanoparticles on corresponding photocatalyst. The influence of solar light irradiation time on photocatalytic degradation of organic dye and conversion of the generated inorganic ions is studied. The reusability and stability of the prepared photocatalysts are assessed. The results indicate that the Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst prepared by using NaBH 4 has best photocatalytic activity, reusability and stability. The capture experiment of active species proves that holes play crucial roles in photocatalytic degradation of organic dyes and conversion of SO 3 2- and electrons are momentous for the conversions of NO 2 - and NO 3 - . A possible mechanism on photocatalytic degradation of organic dyes containing N and S and conversions of NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 caused by Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst is proposed.
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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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Wei Wei,Zhenyao Li,Jitao Shang,Chenxi Xia,Xuli Hu,Yangshun Hu,Junchen Xu,Yan Zhao,Mingyue Ding
The selective electrochemical reduction of CO to valuable multi-carbon (C 2 + ) products is a key strategy for mitigating global warming and addressing the energy crisis. Nevertheless, the activity and selectivity of CO-to-C 2+ products conversion remain low due to the lack of effective catalysts. In this study, bimetallic CuPd was grown in situ on Cu nanoparticles via a seed-mediated approach, constructing a stable CuPd/Cu interface for the CO reduction reaction (CORR). The CuPd alloy promotes CO adsorption and hydrogenation, resulting in abundant and stable *COH intermediates over catalytic sites. Consequently, a stable asymmetric coupling is established at the CuPd/Cu interface, lowering the reaction energy barrier and facilitating C-C coupling. A high acetate selectivity of 49 % was achieved at –1.0 V versus the reversible hydrogen electrode (RHE) with a current density of 349 mA/cm². This study highlights the critical role of constructing CuPd/Cu asymmetric sites for C–C coupling, paving the way for designing highly selective catalysts that enhance C 2+ product formation and acetate production.
研究领域:
材料科学
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电化学
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催化反应
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 41
·19565-19571
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IF 3.591
Peipei Yang,Qingfan Ren,Yuying Chen,Sixue Ouyang,Zhipeng Huang,Peng Zhao,Jia Tao
Alloy nanoparticle-based nanozymes exhibit unique catalytic properties resulting from their tailored atomic coordination numbers and geometric parameters. The development of ultrafine alloy nanozymes is effective for improving their catalytic activities and promoting multifunction. However, it remains a challenge because of the aggregation of alloy nanoparticles resulting from the high surface free energy. This paper reports a strategy for stabilizing ultrafine and uniform CuPd alloy nanoparticles (2.18 ± 0.53 nm) in MIL-101 as a biosensor platform. The steady-state kinetic studies show that CuPd@MIL-101 can serve as a robust peroxidase-like nanozyme with a lower Michaelis constant (Km) than horseradish peroxidase (HRP). H2O2 and glucose were chosen as model targets to develop a sensitive label-free colorimetric method using CuPd@MIL-101. The linear detection of H2O2 in the range of 0.25–700 μM was achieved with a detection limit of 0.043 μM and that of glucose in the linear range of 0.5–400 μM with a detection limit of 0.16 μM. The catalytic activity of CuPd@MIL-101 can remain stable in the dulbecco's modified eagle's medium (DMEM) high-glucose medium and phosphate buffer solution (PBS) for at least five days. This study provides a meaningful reference for developing ultrafine nanozymes without affecting their stability.
研究领域:
生物传感
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纳米医学
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催化化学
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DOI
高影响因子
ChemCatChem
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2024
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IF 3.8
Hao Liu,Jian Zhao,Min Zhang
Graphical Utilizing CuPd alloy on C 3 N 4 as catalyst, the photoswitched coupling of alkynes under anaerobic and alkali-free conditions was achieved. The dual photoactive species (coppr phenylacetylide intermediate and the LSPR effect of Cu) and the interface between Cu and Pd is essential for efficiently swtiching the reaction pathway. Various ratios of CuPd alloy are loaded on C 3 N 4 and utilized as efficient photocatalyst for the light-switched homo-coupling of alkynes in anaerobic and base free condition. For the model phenylacetylene reactant, the light-irradiation promotes the reaction rate from 36.9 % to 99.9 % and the selectivity of 1,3-diynes from 0 % to 68.7 %. Different supports, solvents and the induction period of the prepared samples show influence on the activity. The action spectra with different light wavelengths demonstrate that both copper phenylacetylide intermediate formed during the reaction and the localized surface plasmon resonance (LSPR) effect of the copper in CuPd alloy are the photoactive species. Through the control experiments, it confirms that these dual photoactive species and the interface between Cu and Pd are essential for efficient light-switching reaction pathway.
研究领域:
化学
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材料科学
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DOI
高影响因子
RARE METALS
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2024
·Vol. 43
·期 4
·1513-1523
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IF 9.6
Zhang Ze-Yu,Wang Hai-Bin,Zhang Fei-Fei,Li Jing-Wei,Hu Xin-Zhuo,Yan Si-Wei,Bai Yi-Ming,Zhang Xun,Shen Gu-Rong,Yin Peng-Fei,Yang Jing,Dong Cun-Ku,Mao Jing,Liu Hui,Du Xi-Wen
Electrocatalysis of CO 2 reduction reaction is an effective way to convert CO 2 into high value-added products, but the selectivity of Cu-based catalysts for C 2+ products needs to be improved due to the high energy barrier of C–C coupling. Therefore, a viable catalyst design strategy to decrease energy barrier of C–C coupling should be put forward. Here, a nanocavity-enriched CuPd single atom alloy (CuPd SAA) catalyst is designed to promote C–C coupling process. The faradaic efficiency of CuPd SAA for ethylene and C 2+ reaches 75.6% and 85.7% at − 0.7 V versus reversible hydrogen electrode (RHE), respectively. Based on the results given by in situ characterization, the porous hollow structure dramatically increases the ratio of the linear-bond *CO, thus enhancing the faradaic efficiency for ethylene. Density functional theory (DFT) calculation reveals that the Pd doping can regulate the electronic structure of neighboring Cu atoms to decrease the energy barrier of C–C coupling, further improving the faradaic efficiency. This work provides a new idea for designing catalyst with high selectivity for ethylene. Graphical abstract
研究领域:
材料科学
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化学
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电化学
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催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）