CATALYSIS COMMUNICATIONS
·
2021
·
IF 3.626
Qiaoqi Li,Fei Wang,Xin Zhou,Jianmei Chen,Chao Tang,Lili Zhang
Herein, we reported the systematic investigation of synergistic photo-thermal-catalysis for NaBH 4 hydrolysis reaction based on zinc orthogermanate. A series of Zn 2 GeO 4 : x Fe 3+ ( x = 0 to 0.10) catalysts were prepared via solvothermal method. The H 2 evolution experiments demonstrated that the photogenerated holes trap OH − not only shifted the equilibrium of NaBH 4 hydrolysis reaction toward the direction of H 2 evolution, but also inhibited the recombination of photogenerated carriers. With the remarkable photo-thermal synergism for the as-prepared catalysts, the H 2 evolution rate in photo-thermal-driven condition had witnessed several times higher than that in mono-energy driven condition. The catalysts remained stable after circulation tests.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Hongming Zhang,Lu Zhang,Ismael A. Rodríguez-Pérez,Wenkang Miao,Kangli Chen,Wenfeng Wang,Yuan Li,Shumin Han
Sodium borohydride (NaBH 4 ) is widely identified as a promising hydrogen storage material, therefore, developing a catalyst with high efficiency for hydrogen production is an important subject for development and utilization of hydrogen energy. Meanwhile the hydrolytic mechanism of NaBH 4 needs further study which is helpful for hydrolysis researches. In this study, an efficient catalyst comprising of carbon nanospheres (CNSs) supporting ultrafine bimetallic Pt-Co nanoparticles (CNSs@Pt 0.1 Co 0.9 ) has been successfully synthesized for hydrogen evolution from NaBH 4 hydrolysis. The growth of the Pt-Co nanoparticles on the surface of CNSs is regulated by adjustment of solvent during the preparation. The as-prepared CNSs@Pt 0.1 Co 0.9 catalyst exhibits an outstanding performance in the kinetic and thermodynamic tests with the highest hydrogen generation rate (HGR) of 8943 mL H2 ·min −1 ·g M –1 , initial turnover frequency (TOF) value of 280.1 moL H2 ·min −1 ·mol Pt –1 , and a low activation energy ( E a ) of 38.0 kJ·mol −1 . The hydrolytic mechanism has been surveyed simultaneously by the isotopic tracer method through the mass spectrometric analysis. The catalyst retains extremely high catalytic activity value and the hydrogen generation conversion is still 100% even after five cycles in the catalytic performance tests.
研究领域:
材料科学
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催化化学
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能源化学
✓ 已验证
DOI
高影响因子
Catalysts
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2023
·Vol. 13
·期 3
·619
·
IF 3.9
Chen Yang,Xuefeng Hu,Yaxing Bai,Beichuan Cai,Yujie Li
In this study, a simple and low-energy synthesis scheme of Fe single-atom anchored carbon nitride was reported to improve the photocatalytic performance of g-C3N4. Synthesized Fe single-atom doped graphite carbon nitride (Fe-SACs/g-C3N4) showed high activity and stability for the degradation of 2-mercaptobenzothiazole (MBT); under visible light irradiation, 99% of MBT could be degraded within 35 min, and the degradation ability basically did not decline after five cycles, mainly due to the synergistic effect of the Fe single atoms and carbon nitride. The results of X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS), and density functional theory calculations show that the single-atom Fe forms Fe-N4coordination with pyridine nitrogen to generate a new electron transfer channel, which can significantly improve the in-plane separation and transfer of carriers, finally enhancing the generation of superoxide radicals. This is confirmed by time-resolved photoluminescence, photoelectron chemistry, and electron spin resonance measurements. The main intermediates of MBT degradation were determined using a liquid chromatograph–mass spectrometer (LC-MS), and a possible photocatalytic mechanism based on the quenching experiment and electron paramagnetic resonance (EPR) test was proposed. A deep understanding of the contribution of Fe single-atom sites with clear local coordination structures will help to design effective catalysts for photocatalytic performance.Keywords:graphitic carbon nitride;single-atom;NaBH4reduction;photocatalytic degradation
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2014
·Vol. 3
·期 8
·4493-4500
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IF 0
Lina Chong,Jianxin Zou,Xiaoqin Zeng,Wenjiang Ding
In the present work, hydrogen sorption behaviors of some of the 3NaBH4–LnF3 (Ln = Ce, Sm, Gd and Yb) composites were investigated and the mechanisms associated with different effects of LnF3 (Ln = La, Ce, Pr, Nd, Sm, Gd, Ho, Er and Yb) on reversible hydrogen sorption in NaBH4 were proposed based on careful comparisons. The key factors controlling the properties of 3NaBH4–LnF3 can be summarized as follows: (i) electronegativity χp of Ln3+ determines the thermodynamic stability of 3NaBH4–LnF3 composites with their χp in the range of 1.23–1.54 being suitable for reversible hydrogen storage; (ii) the electronic configuration of Ln3+ influences rehydrogenation behaviors: more stable the oxidation state of the Ln3+ is, the better is the rehydrogenation performance of NaBH4; (iii) the unique crystal structure of the Ln–B phase formed during dehydrogenation, and geometrical configuration of B in Ln–B, provide dangling bonds for hydrogen atoms to embed in, consequently modifying the rehydrogenation kinetics. Because Gd3+ possesses a combination of suitable electronegativity, stable oxidation state and favorable geometric structure in GdB4, the 3NaBH4–GdF3 composite exhibits the best overall hydrogen storage properties among all the studied 3NaBH4–LnF3 composites, with high cycling stability up to 51 cycles along with fast kinetics. This understanding provides us with criterions to design new borohydride-based hydrogen storage systems and to optimize their hydrogen storage properties.
研究领域:
材料科学
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化学
✓ 已验证
DOI
ENERGY & FUELS
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2020
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IF 3.421
Senliang Xi,Peng Zhang,Yuanyi Fu,Kudzaishe Caren Tome,Tonghuan Zhang,Shixue Zhou,Youmin Guo,Hao Yu
In this work, two kinds of zeolites MCM-22 and SAPO-34 were synthesized by the hydrothermal method. The mixture systems of NaBH4 and different mass percentages of zeolite were prepared by ball milling, with no reaction between NaBH4 and the zeolite during the process, as shown by X-ray diffraction analysis. Thermal decomposition of NaBH4 and NaBH4 + zeolite for hydrogen release was investigated by temperature-programmed desorption, differential scanning calorimetry, and pressure composition isothermal methods. It is shown that the presence of zeolites can decrease the hydrogen release temperature. In addition, in comparison to pure NaBH4, whose peak temperature of hydrogen release was 566.8 °C, the peak temperatures of NaBH4 + MCM-22 (1:1) and NaBH4 + SAPO-34 (1:1) decreased to 510.0 and 505.2 °C, respectively. Moreover, the addition of zeolite can improve the hydrogen release kinetics of NaBH4 and when catalyzed by MCM-22 and SAPO-34 can release 2.31 and 3.76 wt. % H2 in 15 h, respectively. Furthermore, SAPO-34 with the larger specific surface area had a better nanoconfinement effect to catalyze hydrogen release of NaBH4 than that of MCM-22.
研究领域:
材料化学
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能源化学
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纳米催化
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储氢材料
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物理化学
✓ 已验证
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2023
·
IF 2.7
Yue-Feng Tang,Meng-Yun Zhao,Guo-Zhi Han
Herein, a novel composite of g-C 3 N 4 and silver nanoparticles(g-C 3 N 4 @Ag) with enhanced bifunctional catalytic activity through chemical etching is reported. A kind of g-C 3 N 4 @Ag composite by one-pot route, then treated the product with sodium borohydride (NaBH 4 ) solution for a certain time is first synthesized. The property and morphology of the g-C 3 N 4 @Ag composite changed greatly after the treatment. Compared with the pristine g-C 3 N 4 @Ag composite, the NaBH 4 -etching endowed g-C 3 N 4 @Ag composite (RACN) with smoother two-dimensional plane structure, as well as an extension of the conjugate system which originating from the stronger chemical connection between the Ag nanoparticles and g-C 3 N 4 . Furthermore, research results indicated that the RACN showed superior broad-spectrum catalytic performance for the reduction of aromatic nitro compounds, and the catalytic efficiency of the RACN is enhanced dozens of times by the treatment. Moreover, the photocatalytic activity of the RACN is also greatly improved. This discovery provides an efficient and facile method toward the enhancement of catalytic activity of semiconductor and metal nanoparticle composites by chemical etching.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 8
·435
·
IF 4.2
Weiwei Chen,Yiying Chen,Xianhu Zhu,Miaomiao Xu,Zhihao Han,Lianhui Wang,Lixing Weng
The content of magnesium ions (Mg2+) in drinking water is relatively high and the excessive Mg2+ingestion may lead to pathological lesions in the human body system. At present, the detection of Mg2+still relies on costly devices or/and complex organic fluorescence probes. To solve this problem, this work proposed a NaBH4-mediated co-reduction strategy for the synthesis of glutathione-stabilized bimetallic AuAg nanoclusters (GSH@AuAg NCs) with performance recognition to Mg2+. The preparation of GSH@AuAg NCs was simple and rapid and could be performed at mild conditions. The reaction parameters and sampling orders were optimized to understand the formation mechanism of GSH@AuAg NCs. The GSH@AuAg NCs exhibited a sensitive “light on” fluorescence response to Mg2+due to the re-molding of the interfacial physicochemical environment following the Mg2+coordination, which affected the surface charge transfer process, and thus led to a novel method for fluorescence detection of Mg2+with admirable selectivity for Mg2+. The proposed method showed a detection limit of 0.2 μM, and its practical utility for the detection of Mg2+in a real sample of purified drinking water was also demonstrated, confirming its practicability in monitoring the Mg2+concentration in drinking water.Keywords:bimetallic AuAg nanoclusters;coordination;glutathione;NaBH4;magnesium ions
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Lisi Xie,Kunyang Wang,Gu Du,Abdullah M. Asiri,Xuping Sun
In this work, we demonstrate the first use of cobalt oxide nanosheet array on carbon cloth (CoO/CC) as an efficient catalyst for the dehydrogenation of NaBH 4 . This catalyst shows a low activation energy of 35.40 kJ/mol for NaBH 4 hydrolysis and the hydrogen generation rate at 30 °C can reach up to 5955.29 mL/min/g CoO . Moreover, the catalyst exhibits high recyclability and durability. It suggests that the hydrolysis kinetics depends on many parameters, including temperature, NaBH 4 concentration, NaOH concentration and mass of catalyst.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Kaihui Hua,Zhijing Wu,Weijie Chen,Yu Zheng,Xiuan Xi
Despite extensive research on TiO 2 -based photocatalysts, their poor visible-light response and low charge-separation efficiency still limit practical applications in wastewater treatment. While previous studies have explored individual strategies such as metal doping or defect engineering, few have systematically investigated their synergistic effects in TiO 2 porous ceramics. This study addresses these challenges by developing a dual-modification strategy combining ZnO doping and NaBH 4 reduction to enhance the photocatalytic performance of TiO 2 porous ceramics. ZnO doping promotes anatase phase stability and inhibits the anatase-to-rutile transition, while NaBH 4 reduction introduces abundant oxygen vacancies and Ti 3+ species, narrowing the band gap and extending light absorption into the visible range. As a result, the optimized ceramics achieve a methylene blue degradation efficiency of 90.07%, outperforming undoped (79.32%) and singly ZnO-doped (86.01%) counterparts. This synergistic enhancement is attributed to the tailored surface chemistry and electronic structure, verified through structural and optical characterizations. Compared with previous TiO 2 porous ceramic studies, this work provides a scalable and effective modification strategy, offering new insights for designing high-efficiency, recyclable photocatalysts for environmental remediation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuxin Li,Guolang Zhou,Jingzhou Yin,Feixiang Li,Qing Zou,Wen Chen,Wenjie Yan,Qiaoqi Li,Cheng Liu,Alireza Khataee,Lili Zhang
Two-dimensional catalysts, which are sensitive to visible light and have a photothermal effect, can be used to catalyse the release of H 2 from sodium borohydride (NaBH 4 ) are being actively explored in energy saving systems. In this work, oxygen vacancy enriched two-dimensional CoFe-layered double hydroxide (CoFe-LDH) derivatives (named as CoFe- x °C, x = 200–500) have been explored for NaBH 4 hydrolysis catalyzed by photo-thermal synergy without external heat source. The CoFe-300 °C presents its initial hexagonal lamellar structure and has the highest concentration of oxygen vacancy . These unique properties guarantee its excellent photo-thermal synergistic catalytic performance, achieving hydrogen production rate of 1877.5 mmol g −1 h −1 , and maintains high efficiency after 5 cycles. This enhanced photo-thermal synergistic catalytic mechanism is the •OH (generated from h + and H 2 O) attacks BH 4 − (absorbed on O v sites) to produce H 2 , the heat from photothermal conversion accelerates the adsorption ability and attacking rate. This study opens a new strategy for the synergistic photo-thermal catalytic hydrolysis of NaBH 4 .
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
CELLULOSE
·
2021
·Vol. 28
·期 6
·3515-3529
·
IF 5.044
Zhang Mingzhu,Li Meng,Yu Ningya,Su Shengpei,Zhang Xiaomin
A series of tannic acid (TA)-modified cellulose hydrogels embedded size-controlled AgCl nanoparticles (AgCl@TA x -cellulose hydrogels) were fabricated successfully via a one-step method. The size of AgCl nanoparticles in the TA-cellulose hydrogels could be adjusted expediently by varying the TA content. With the increase of TA content, the size of AgCl nanoparticles initially decreased and reached the minimum size of 5.5 nm at 5% TA content and then increased dramatically. The hydrogels with the smallest AgCl nanoparticles exhibited excellent catalytic activity in NaBH 4 -mediated reduction of 4-nitrophenol (4-NP); the reaction rate constant was as high as 1.383 min −1 . It should be noted that NaBH 4 played a double role in the reduction of 4-NP presented here, i.e., in-situ reduction of AgCl to Ag nanoparticles and successive reduction of 4-NP over the resultant Ag@TA x -cellulose hydrogels. In such a way, the strategy of “catalysis along with reduction” provided a novel path for catalytic systems involving noble metal catalysts. Also, the above AgCl@TA x -cellulose hydrogels exhibited good catalytic activity for NaBH 4 -mediated reduction of various organic dyes following the procedure of “catalysis along with reduction”.
研究领域:
材料科学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2017
·
IF 0
Hao Zhong,Liu Zhang Ouyang,Jian Shan Ye,Jiang Wen Liu,Hui Wang,Xiang Dong Yao,Min Zhu
The hydrolysis of NaBH 4 offers significant advantages for hydrogen storage in fuel cells, whereby suffers from the irreversibility . Thus, a simple and low cost method for NaBH 4 regeneration from its hydrolysis byproduct is crucial. Herein, we describe a single step method for NaBH 4 regeneration, which combines both hydrogen production and storage in the one step. In the process, a mixture of magnesium silicide and dihydrate sodium metaborate is reacted via ball milling under ambient conditions without the requirements of additional hydrogen sources . The hydrogen only comes from the splitting of H 2 O in the NaBO 2 ·2H 2 O that is a direct byproduct of NaBH 4 hydrolysis. The purified product demonstrates the same physicochemical properties as commercial NaBH 4 . Yields for NaBH 4 regeneration approaching 80% are achieved using this method. Mechanism study indicates that the high yield is likely to be beneficial from the formation of the Mg-O-Si-H conjugated structure. NaBH 4 regeneration using this process demonstrates a 30-fold reduction in cost over a previous study that used MgH 2 as the reduction agent.
研究领域:
化学
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材料科学
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能源存储
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）