ENVIRONMENTAL ENGINEERING SCIENCE
·
2020
·Vol. 37
·期 1
·64-77
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IF 1.681
Yuxiang Yan,Hua Yang,Zao Yi,Xiangxian Wang,Ruishan Li,Tao Xian
In this work, we have adopted a coprecipitation method to synthesize BiOBr nanoplates with diameter of 150–450 nm and thickness of 40–80 nm, and then created Bi nanowires (diameter: 6 nm) on their surface through a NaBH4 reduction method. Evolution of Bi nanowires was systematically investigated by varying the concentration of NaBH4 solution and reaction time. It is demonstrated that with increasing the NaBH4 concentration (2 h reaction), Bi nanowires are gradually evolved from BiOBr crystals, and in particular treatment by 110 mM NaBH4 solution leads to the complete evolution of BiOBr nanoplates to Bi nanowires. At a low-concentration NaBH4 solution (30 mM), BiOBr crystals are partially reduced to Bi nanowires with increasing reaction time, and then the Bi nanowires are recrystallized into BiOBr nanowires/nanoparticles on the surface of BiOBr nanoplates. At a high-concentration NaBH4 solution (110 mM), BiOBr nanoplates are easily reduced to Bi nanowires with a short reaction time, and further prolonging the reaction time leads to the gradual transformation of Bi nanowires into Bi4O5Br2 nanoparticles/nanowires. Photocatalytic performances of the samples were evaluated by eliminating rhodamine B from aqueous solution under simulated sunlight illumination. It is demonstrated that the creation of Bi nanowires (an appropriate content) on the surface of BiOBr nanoplates can produce excellent Bi@BiOBr composite photocatalysts with enhanced photodegradation performances. The underlying enhanced photocatalytic mechanism was investigated and discussed.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Huatong Li,Xinran Hu,Lixia Wang,Luyan Shi,Tayirjan Taylor Isimjan,Xiulin Yang
Developing heterostructured catalysts with highly active and reusable is an urgent task to achieve green hydrogen production via NaBH 4 . Herein, we proposed a novel NaCl template method, which involves solid-state physical grinding of metal salts, reducing agents and prepared carbon spheres with the participation of sodium chloride to synthesize Ru-particles decorated CoB 2 O 4 supported on hollow mesoporous carbon nanospheres (Ru/CoB 2 O 4 @C) catalysts for efficient and durable H 2 generation through alkaline hydrolysis of NaBH 4 . The optimized catalyst with a Ru content of 3.0 wt% exhibits a high hydrogen generation rate of 8139 mL min −1 g cat - 1 and a low activation energy of 33.2 kJ mol −1 for NaBH 4 hydrolysis, which is one of the most efficient catalysts reported recently. The extraordinary performance is mainly attributed to the synergistic effect between Ru and CoB 2 O 4 species and abundant oxygen vacancies, which facilitate charge redistribution and provide more active sites, thereby enhancing the catalytic activity. Density functional theory calculations support the proposed Michaelis-Menten mechanism, where BH 4 − and H 2 O are adsorbed on electron-rich Ru and electron-deficient CoB 2 O 4 surfaces, respectively, and the reaction energy barrier for the rupture of the B-H bond as the rate-determining step is only 1.37 eV, synergistically promoting the hydrolysis of NaBH 4 . Our study provides an innovative method for designing efficient and stable catalysts for green hydrogen generation.
研究领域:
材料科学
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催化化学
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能源化学
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 50
·35689-35694
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IF 3.9
Huandi Hou,Ting Wang,Baohuan Wang,Wenting Guo,Xiang Miao,Xin Liang
Co–Mo–S based catalysts have promising applications in both the hydrogen evolution reaction (HER) and hydrodesulfurization (HDS). Herein, Co–Mo–S catalyst and Co–Mo–S catalyst with and without NaBH4 modification have been successfully synthesized by a simple hydrothermal synthesis method. Co–Mo–S catalysts with NaBH4 modification show better catalytic activity towards both HDS and the HER. The phase purity, morphology, crystal structures and electron valence distribution of the catalysts with and without NaBH4 modification were studied by experimental characterizations and theoretical calculations. The catalysts without NaBH4 modification are mostly 2H-MoS2, while the catalysts without NaBH4 modification have 1T-MoS2, and 1T-MoS2 is exposed to more active sites, which will be conducive to the results of HDS performance of the catalyst. DFT calculations investigated the required activation energies of 1T-MoS2 and 2H-MoS2 for HDS and HER, respectively. The activation energy required for both HDS and H2 generation of 1T-MoS2 is significantly lower than that for the 2H-MoS2 structure.
研究领域:
催化化学
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材料科学
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理论计算
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jian Ji,Kebin Deng,Jianing Li,Zhihua Zhang,Xuezhi Duan,Haibao Huang
Despite substantial progress in various application fields of polyoxometalates (POMs), the use of POMs as ligands to alter the structure of solid catalysts in heterogeneous catalysis requires additional efforts. Herein, we used the reduced α-SiW 12 O 40 4- (RSTA) as an inorganic ligand to mediate Co 3 O 4 nanoparticles that efficiently promote the hydrolysis of NaBH 4 to generate hydrogen with multiple activities (4747 mL/(g cat ·min)) compared with NaBH 4 -pretreated Co 3 O 4 (1236 mL/(g cat ·min)), pristine Co 3 O 4 (inactive) and commercial Co 3 O 4 (inactive) at 25℃. RSTA induced both electronic and morphology effects on Co 3 O 4 through in situ driving 3D Co 3 O 4 nanoparticles to 2D Co 3 O 4 nanosheets with rich surface oxygen vacancies or Co 2+ during the hydrolysis process. This modulation by RSTA allowed more active sites, including both electron-rich Co 0 and electron-deficient Co 2+ , facilitating BH 4 - and H 2 O adsorption and thus hydrogen generation. The promoted mechanism of the RSTA on both the microstructure and the catalytic performance was further proposed.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
Catalysts
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2019
·Vol. 9
·期 10
·795
·
IF 3.444
Yuxiang Yan,Hua Yang,Zao Yi,Tao Xian
In this work, we have synthesized BiOCl nanoplates (diameter 140–220 nm, thickness 60–70 nm) via a co-precipitation method, and then created Bi nanoparticles (diameter 35–50 nm) on the surface of BiOCl nanoplates via a NaBH4reduction method. By varying the NaBH4concentration and reaction time, the evolution of Bi nanoparticles was systematically investigated. It is demonstrated that with increasing the NaBH4concentration (at a fixing reaction time of 30 min), BiOCl crystals are gradually reduced into Bi nanoparticles, and pure Bi nanoparticles are formed at 120 mM NaBH4solution treatment. At low-concentration NaBH4solutions (e.g., 10 and 30 mM), with increasing the reaction time, BiOCl crystals are partially reduced into Bi nanoparticles, and then the Bi nanoparticles return to form BiOCl crystals. At high-concentration NaBH4solutions (e.g., 120 mM), BiOCl crystals are reduced to Bi nanoparticles completely with a short reaction time, and further prolong the treatment time leads to the transformation of the Bi nanoparticles into a two-phase mixture of BiOCl and Bi2O3nanowires. The photodegradation performances of the samples were investigated by choosing rhodamine B (RhB) as the model pollutant and using simulated sunlight as the light source. It is demonstrated that an enhanced photodegradation performance can be achieved for the created Bi@BiOCl hybrid composites with appropriate NaBH4treatment. The underlying photocatalytic mechanism was systematically investigated and discussed.Keywords:BiOCl nanoplates;Bi nanoparticles;NaBH4reduction;Bi@BiOCl hybrids;photodegradation performance
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
RSC Advances
·
2018
·Vol. 8
·期 46
·25873-25880
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IF 2.936
Jie Guo,Yongjiang Hou,Bo Li
A hollow Ni–Fe–B nanochain is successfully synthesized by a galvanic replacement method using a Fe–B nanocomposite and a NiCl2 solution as the template and additional reagent, respectively. Both the concentration of Ni and the morphology of the resulting Ni–Fe–B alloy are controlled by varying the duration of the replacement process during the synthesis. The Ni–Fe–B sample synthesized for 60 min (Ni–Fe–B-60) shows the best catalytic activity at 313 K, with a hydrogen production rate of 4320 mL min−1 gcat−1 and an activation energy for the NaBH4 hydrolysis reaction of 33.7 kJ mol−1. The good performance of Ni–Fe–B-60 towards the hydrolysis of NaBH4 can be ascribed to both hollow nanochain structural and electronic effects. Furthermore, the effects of temperature, catalyst amount, and concentration of NaOH and NaBH4 on the hydrolysis process are systematically studied, and an overall kinetic rate equation is obtained. The hollow Ni–Fe–B nanochain catalyst also shows good reusability characteristics and maintained its initial activity after 5 consecutive cycles.
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
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
·
IF 3.582
Kai Li,Min Ma,Lisi Xie,Yadong Yao,Rongmei Kong,Gu Du,Abdullah M. Asiri,Xuping Sun
In this work, we demonstrate the first use of NiCoP nanosheet array on Ti mesh (NiCoP NA/Ti) as an efficient catalyst for hydrolysis of NaBH 4 in alkaline media . This catalyst shows a low activation energy of 52.68 kJ/mol for NaBH 4 hydrolysis meanwhile the hydrogen generation rate can achieve 3016.79 mL/min/g (NiCoP) at 303 K, outperforming most reported Co-based noble-metal-free catalysts and some noble-metal catalysts. Remarkably, the catalyst exhibits high recyclability , durability and controllability for on-demand hydrogen generation in alkaline NaBH 4.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2016
·Vol. 10
·期 2
·595-604
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IF 8.893
Cui Liang,Xu Yuanhong,Niu Li,Yang Wenrong,Liu Jingquan
The issues of hydrogen generation and storage have hindered the widespread use and commercialization of hydrogen fuel cell vehicles. It is thus highly attractive, but the design and development of highly active non-noble-metal catalysts for on-demand hydrogen release from alkaline NaBH 4 solution under mild conditions remains a key challenge. Herein, we describe the use of CoP nanowire array integrated on a Ti mesh (CoP NA/Ti) as a three-dimensional (3D) monolithic catalyst for efficient hydrolytic dehydrogenation of NaBH 4 in basic solutions. The CoP NA/Ti works as an on/off switch for on-demand hydrogen generation at a rate of 6,500 mL/(min·g) and a low activation energy of 41 kJ/mol. It is highly robust for repeated usage after recycling, without sacrificing catalytic performance. Remarkably, this catalyst also performs efficiently for the hydrolysis of NH 3 BH 3 .
研究领域:
材料科学
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催化
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能源存储
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氢燃料电池
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 18
·期 4
·1087-1097
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IF 2.279
Yan Zhenhua,Wang Min,Lu Youqin,Liu Renmin,Zhao Jinsheng
Three carbon-supported Pt–Co alloys with varying Pt to Co atom ratio (Pt 2 –Co/C, Pt–Co/C, Pt–Co 2 /C) were prepared by NaBH 4 reduction in ethylene glycol at room temperature. As supported by X-ray diffraction, all the prepared Pt–Co nanoparticles have a single-phase face-centered cubic structure. Transmission electron microscopy indicates that all nanoparticles have small particle-size range and are highly dispersed on carbon support. Catalytic properties of the synthesized Pt–Co alloy catalysts were analyzed using cyclic voltammetry and linear sweep voltammetry methods, and the results suggested that Pt–Co/C catalysts exhibit the best Pt mass activity and the highest stability for the oxygen reduction reaction (ORR) when compared with Pt/C catalyst and other Pt–Co alloy catalyst in both acidic and neutral media. Kinetic analysis reveals that the ORR on Pt–Co alloy follows the four-electron pathway leading to water. As the cathode catalyst, the single-chamber microbial fuel cell tests indicated the much better performance of Pt–Co alloy than that of commercial Pt/C.
研究领域:
电化学
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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
CHEMISTRY-A EUROPEAN JOURNAL
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2016
·Vol. 22
·期 42
·14831-14835
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IF 5.771
Liang Cui,Xuping Sun,Yuanhong Xu,Wenrong Yang,Jingquan Liu
Graphical Hydrogen generation : The catalytic dehydrogenation of NaBH 4 in alkaline media for on-demand hydrogen generation can be effectively driven by self-supported Co(CO 3 ) 0.5 (OH)⋅0.11 H 2 O nanowire array on Ti mesh (CHNA/Ti), with a high hydrogen generation rate of 4000 mL min −1 g Co −1 and a low activation energy of 39.78 kJ mol −1 . In this work, for the first time, a cobalt carbonate hydroxide (Co(CO 3 ) 0.5 (OH)⋅0.11 H 2 O) nanowire array on Ti mesh (CHNA/Ti) was applied to drive the dehydrogenation of alkaline NaBH 4 solution for on-demand hydrogen production. Compared with other nanostructured Co-based catalyst systems, CHNA/Ti can be activated more quickly and separated easily from fuel solutions. This self-supported cobalt salt nanowire array catalyst works as an efficient and robust 3D catalyst for the hydrolysis reaction of NaBH 4 with a hydrogen generation rate of 4000 mL min −1 g Co −1 and a low apparent activation energy of 39.78 kJ mol −1 and offers an attractive system for on-demand hydrogen generation.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 2
·1-9
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IF 5.7
Shi Lu,Tang Qiaorong,Yang Bing,Li Baoxin,Yang Chaoyong,Jin Yan
Gas pressure biosensing is a promising portable analysis method. The gas-generation reaction is crucial to its sensitivity, speed, repeatability, and usability. However, very few gas-generation reactions are available for sensitive, safe, and diverse biosensing. Herein, acid-accelerated hydrolysis of sodium borohydride (NaBH 4 ) was explored for the first time to achieve portable and diverse gas pressure biosensing. The slow hydrolysis and hydrogen generation of NaBH 4 in alkaline medium is accelerated with increasing acidity, which increased the gas pressure in a small and sealed tube within 10 min. Thus, a label-free bioassay is easily and specifically achieved once analytes can in-situ generate acid to accelerate the hydrolysis rate of NaBH 4 , such as glucose, acetylcholine (ACh), adenosine triphosphate (ATP) and others. More importantly, analytes without acid generation could be quantitatively and selectively detected by combining target recognition with acid-generated biochemical reactions for enzyme-linked gas pressure biosensing. Inspired by this, aflatoxin B1 (AFB1)-aptamer interaction-triggered strand displacement reaction was combined with glucose oxidation by glucose oxidase (GOD) to detect AFB1 as low as 7.1 pM. Therefore, acid-accelerated hydrolysis of NaBH 4 is powerful for developing portable, cheap, and diverse gas pressure biosensing. It opens up a new way for cheap, universal, and portable biosensing. Graphical Abstract
研究领域:
分析化学
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生物化学
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传感器与生物传感器
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yiting Bu,Jiaxi Liu,Dan Cai,Pengru Huang,Sheng Wei,Xiaoshuang Luo,Zhaoyu Liu,Fen Xu,Lixian Sun,Xueying Wei
NaBH 4 (10.8 wt% theoretical hydrogen storage capacity) is an ideal hydrogen carrier, but its hydrolysis reaction at room temperature requires high-efficiency catalysts for activation and acceleration. Structured catalysts can effectively inhibit metal particle agglomeration . However, metal particles fall off the surface of the support during testing. Therefore, we report a magnetic recyclable hollow shell material H-Co/N/C-Ru@C-T. The dual protection of carbonized ZIF-67 as a framework and surface-coated carbon film makes it show good catalytic activity and durability in NaBH 4 hydrolysis reaction. The hydrogen generation rate (HGR) is as high as 9815.82 mL H2 min −1 g −1 , and the activation energy ( E a ) is reduced to 26.9 kJ mol −1 . Moreover, it retains 81.3% of its initial catalytic activity even after 25 hydrolysis cycles. Through a series of characterization, such as electron scanning spectroscopy and inductively coupled plasma atomic emission, the improvement effect of using hollow Co/N/C as framework and coating carbon film on surface on the catalytic activity and durability of H-Co/N/C-Ru@C-650 is systematically revealed. We believe this work is of unusual significance on exploring novel hydrogen storage material catalysts, especially providing opportunities for the improvement of catalytic activity and durability of catalysts.
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
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）