APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
·
IF 21.1
Jun Zhang,Kaidong Shen,Chang Xu,Enci Wu,Tengfei Ding,Baohao Qian,Mengdie Cai,Jia-qi Bai,Qin Li,Jingshuai Chen,Chang-Jie Mao,Song Sun
Broadening the spectral response to visible light and improving charge carrier mobility are key to increasing the efficiency of wide-bandgap semiconductors in photocatalytic water splitting for hydrogen production. This study introduces a cost-effective photosensitive organic photocatalytic semiconductor, Fluorescein (FL, C 20 H 12 O 5 ), and synthesizes the FL-Cu 1 Ni 2.5 -TiO 2 hybrid using a combined impregnation-photodeposition and electrostatic self-assembly strategy. The incorporation of CuNi bimetallic materials reduces costs, while hybridizing the photosensitizer (PSS) with the photocatalyst (PC) improves interfacial compatibility. This organic-inorganic hybrid exhibits a broad-spectrum response via photosensitization (PSS-PC), achieving efficient and stable photocatalytic hydrogen evolution under visible light (207.14 µmol/h). Moreover, FL also acts as an organic semiconductor, facilitating full-spectrum photosensitization and spatial carrier separation through the heterostructure. The dual-channel mechanism further enhances photocatalytic hydrogen evolution. Additionally, DFT calculations highlight the significant activity differences of FL-Cu 1 Ni 2.5 -TiO 2 in various electron donor environments. This research offers a promising new approach for enabling traditional wide-bandgap semiconductors to perform efficient photocatalytic water splitting under visible light by constructing an organic-inorganic hybrid system.
研究领域:
材料科学
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能源化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Shujing Zhang,Hong Ma,Yuxia Sun,Xin Liu,Meiyun Zhang,Yang Luo,Jin Gao,Jie Xu
Tandem catalysis for the hydrogenation rearrangement of furfural (FA) provides an attractive solution for manufacturing cyclopentanone (CPO) from renewable biomass resources. The CuNi/Al-MCM-41 catalyst was synthesized and afforded excellent catalytic performance with 99.0% conversion and 97.7% selectivity to CPO in a near-neutral solution under 2.0 MPa H 2 at 160 °C for 5 h, much higher than those on other molecular sieve supports including MCM-41, SBA-15, HY, and ZSM-5. A small amount of Al highly dispersed in MCM-41 plays an anchoring role and ensures the formation of highly dispersed CuNi bimetallic nanoparticles (NPs). The remarkably improved catalytic performance may be attributed to the bimetallic synergistic and charge transfer effects. In addition, the initial FA concentration and the aqueous system pH required precise control to minimize polymerization and achieve high selectivity of CPO. Fourier transform infrared spectroscopy and mass spectra results indicated that polymerization was sensitive to pH values. Under acidic conditions, FA and intermediate furfuryl alcohol polymerize, while the intermediate 4-hydroxy-2-cyclopentenone mainly polymerizes under alkaline conditions, blocking the cascade of multiple reactions. Therefore, near-neutral conditions are most suitable for minimizing the impact of polymerization. This study provides a useful solution for the current universal problems of polymerization side reactions and low carbon balance for biomass conversion .
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lingjiao Li,Jing Xu,Binyi Su
In the field of photocatalysis, most of the photocatalysts are semiconductors. Recent years, there have been many photocatalytic systems related to non-semiconductor catalysts. In this paper, a photocatalytic hydrogen evolution system of hexagonal Ni(OH) 2 derived from CuNi bimetal is obtained by classical hydrothermal method. The derived hexagonal Ni(OH) 2 can promote the separation of photogenerated electron-hole pairs and greatly improve the effect of photocatalytic hydrogen evolution. The electron-hole pair comes from the surface plasmon resonance (SPR) effect of Cu from CuNi composite. It is worth noting that photoluminescence spectra and photoelectrochemical experiments have confirmed that the CuNi-5 complex can effectively improve space charge separation. The results of linear scanning voltammetry show that the material has high current response characteristics. This system gives a practical solution for planning and synthesizing non-semiconductor catalysts with high photocatalytic activity.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 10
·683
·
IF 3.8
Deqin He,Zheng Liang,Juwen Gu,Xuechun Sang,Yujia Liu,Songbai Qiu
Furfuryl alcohol represents a pivotal intermediate in the high-value utilization of renewable furfural, derived from agricultural residues. The industrial-scale hydrogenation of furfural to furfuryl alcohol typically employs Cu-based catalysts, but their limited catalytic activity necessitates high-temperature and high-pressure conditions. Here, we develop robust CuNi bimetallic catalysts through direct calcination of dried sol–gel precursors under H2atmosphere, enabling the complete conversion of furfural to furfuryl alcohol under mild conditions. By adjusting the calcination atmosphere and introducing small amounts of Ni, we achieve the formation of highly dispersed, ultrasmall Cu nanoparticles, resulting in a significant enhancement of the catalytic activity. The optimized 0.5%Ni-10%Cu/SiO2-CA(H2) catalyst demonstrates superior catalytic performance, achieving 99.4% of furfural conversion and 99.9% of furfuryl alcohol selectivity, respectively, at 55 °C under 2 MPa H2, outperforming previously reported Cu-based catalysts. The excellent performance of CuNi bimetallic catalysts can be attributed to the highly dispersed Cu nanoparticles and the synergistic effect between Cu and Ni for H2activation. This research contributes to the rational design of Cu-based catalysts for the selective hydrogenation of furfural.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Min Li,Yutao Cao,Jiaqi Dang,Shuo Cui,Wei Cui,Zengxi Li,Hong Zhao
Bimetallic catalysts are widely used in electrochemical CO 2 reduction reactions (ECRR). However, the study of structural effects of bimetallic catalysts on ECRR is still limited. Herein, two kinds of nitrogen-doped carbon-supported CuNi bimetallic catalysts with alloy structure (CuNi/NC-alloy) and phase-separated structure (CuNi/NC-PS) were prepared, respectively, and their ECRR performance were studied. Interestingly, compared with CuNi/NC-alloy, the unique phase separation structure in the CuNi/NC-PS catalyst made the d-band center of Ni the most moderate, balancing the bonding strength with *COOH and *CO, making it not only exhibited relatively low CO 2 activation barrier but also not been poisoned by CO, thus exhibiting higher CO selectivity. Therefore, CuNi/NC-PS exhibited superior catalytic activity (−0.86 V vs. RHE, FE CO = 94.03 %, j CO = 37.06 mA cm −2 ) compared to CuNi/NC-alloy. In the membrane electrode assembly, based on CuNi/NC-PS catalyst and Co/Mo metal–organic frameworks (Co/Mo-MOF) catalyst, the coupling of formaldehyde oxidation and CO 2 reduction could save 22 % energy consumption at the current density of 100 mA cm −2 and obtain high value-added anode product HCOO − . This study will lay a foundation for understanding the structural effects of CuNi based bimetallic catalysts on their electrocatalytic activities.
研究领域:
材料科学
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电化学
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能源催化
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Bo Liu,Hao Zhang,Qi Lu,Guanghe Li,Fang Zhang
To address the challenges of low hydrodechlorination efficiency by non-noble metals, a Cu Ni bimetallic cathode with nanostructured copper array film was fabricated for effective electrochemical dechlorination of trichloroethylene (TCE) in aqueous solution. The Cu Ni bimetallic cathodes were prepared by a simple one-step electrodeposition of copper onto the Ni foam substrate, with various electrodeposition time of 5/10/15/20 min. The optimum electrodeposition time was 10 min when copper was coated as a uniform nanosheet array on the nickel foam substrate surface. This cathode exhibited the highest TCE removal, which was twice higher compared to that of the nickel foam cathode. At the same passed charge of 1080C, TCE removal increased from 33.9 ± 3.3% to 99.7 ± 0.1% with the increasing operation current from 5 to 20 mA cm −2 , while the normalized energy consumption decreased from 15.1 ± 1.0 to 2.6 ± 0.01 kWh log −1 m −3 . The decreased normalized energy consumption at a higher current density was due to the much higher removal efficiency at a higher current. These results suggest that Cu Ni cathodes prepared by simple electrodeposition method represent a promising and cost-effective approach for enhanced electrochemical dechlorination.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 43
·22772-22781
·
IF 8.867
Piyong Zhang,Ting Song,Tingting Wang,Heping Zeng
The field of photocatalytic hydrogen evolution has almost exclusively concentrated on semiconductor photocatalysts, with few reports of non-semiconductor photocatalytic systems due to the small number of non-semiconductor catalysts and their poor photocatalytic ability. Herein, dendrite-like plasmonic CuNi bimetal was prepared by a hydrothermal method, followed by modification with reduced graphene oxide (rGO) nanosheets to facilitate the separation of the electron–hole pair and improve the photocatalytic H2 evolution rate. The electron–hole pair originates from the surface plasmon resonance (SPR) effect of Cu in CuNi bimetal. Importantly, a near-infrared photocatalytic activity was confirmed with monochromatic light irradiation at a wavelength of 800 and 900 nm in the photocatalytic system due to the broad-spectrum response of plasmonic Cu. In addition, this photocatalyst exhibited favorable stability and repeatability in five consecutive runs of accumulatively 30 h. This study provides a new and significant approach for the development of a non-semiconductor photocatalytic system, which could effectively broaden the scope of the photocatalyst field.
研究领域:
材料科学
·
能源化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 8
·2479-2488
·
IF 6.1
Yiwei Zhao,Chao Zhang,Shuangxi Xing,Zuhang Jin,Tingting Xiao
Biomass upgrading by electrochemical means is of great scientific significance due to the environmentally friendly procedures and low energy consumption costs. Herein, electro-oxidation (ECO) of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) and electro-reduction (ECR) to 2,5-furandimethanol (BHMF) with high yield have been studied on CuNi-based bimetallic catalysts. Ni(OH)2-NCF and Cu-NCF achieved 99% and 96.5% yields at a HMF concentration of 10 mM in ECO and ECR, respectively. During ECO, the presence of Cu2O in the catalyst facilitated the adsorption of HMF, and the formed NiOOH in its vicinity promoted the proton coupled electron transfer process and thus resulted in the fast capture and removal of H protons. The presence of Cu–O–Ni linkages in the Ni(OH)2-NCF electrocatalyst was beneficial for the formation of Ni3+ active sites. During ECR, the synergistic effect between Cu and Ni species also contributed to the generation and spillover of Hads species and then enhanced the reactivity.
研究领域:
电化学
·
催化
·
生物质转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）