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Synergistic integration of self-supported 1T/2H-WS_(2) and nitrogendoped rGO on carbon cloth for pH-universal electrocatalytic hydrogen evolution

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Nano Research 2024年第3期17卷 1267-1280页

作者： Feng Ming yap Jian yiing Loh Wee-Jun Ong School of Energy and Chemical Engineering Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia Center of Excellence for NaNo Energy&Catalysis Technology(CONNECT) Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Gulei innovation institute Xiamen UniversityZhangzhou 363200China Shenzhen Research institute of Xiamen University Shenzhen 518057China

Hydrogen economy based on electrochemical water splitting exemplified one of the most promising means for overcoming the rapid consumption of fossil fuels and the serious deterioration of global *** development of earth-abundant,efficient,and durable electrocatalysts for hydrogen evolution reaction(HER)plays a vital role in the commercialization of water ***,the self-supported electrode with unique nitrogen-doped reduced graphene oxide(N-rGO)nanoflakes and WS_(2) hierarchical nanoflower that were grown directly on carbon cloth(CC)substrate(WS_(2)/N-rGO/CC)was successfully synthesized using a facile dual-step hydrothermal *** as-synthesized 50%1T/2H-WS_(2)/N-rGO/CC(WGC),which possessed high metallic 1T phase of 57%not only efficiently exposed more active sites and accelerated mass/charge diffusion,but also endowed excellent structural lustiness,robust stability,and durability at a high current *** a result,the 50%WGC exhibited lower overpotentials and Tafel slopes of 21.13 mV(29.55 mV∙dec^(-1))and 80.35 mV(137.02 mV∙dec^(-1))as compared to 20%Pt-C/CC,respectively for catalyzing acidic and alkaline hydrogen evolution ***,the as-synthesized 50%WGC also depicted long-term stability for more than 8 h in the high-current-density regions(100 and 220 mA∙cm^(-2)).in brief,this work reveals a self-supported electrode as an extraordinary alternative to Pt-based catalysts for HER in a wide pH range,while paving a facile strategy to develop advanced electrocatalysts with abundant heterointerfaces for practical applications in energy-saving hydrogen production.

关键词： self-supported electrocatalyst carbon-based substrate phase engineering pH-universal water splitting

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Application of organic fertilizer for improving soybean production under acidic stress

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Oil Crop Science 2024年第1期9卷 46-52页

作者： Putri Gita Lestari Ayu Oshin yap Sinaga David Septian Sumanto Marpaung Winati Nurhayu indah Oktaviani Department of Biology Institut Teknologi SumateraJl.Terusan RyacuduWay HuwiKec.Jati AgungLampung SelatanLampung35365Indonesia Department of Biosystems Engineering Institut Teknologi SumateraJl.Terusan RyacuduWay HuwiKec.Jati AgungLampung SelatanLampung35365Indonesia

The presence of acidic soil in rural areas poses difficulties for agricultural *** factor regulating soil pH is the overuse of inorganic *** increased use of fertilizers in soybean production not only raises sustainability concerns but also contributes to soil ***,the use of organic fertilizer could offer a solution for addressing both issues related to soil acidity and *** purpose of this study was to investigate the manipulation of soil pH using organic fertilizer for soybean production under acidic *** planting medium,consisting of a mixture of topsoil,rice husk charcoal,and organic fertilizer(in a ratio of 2:1:1),was supplemented with 0.5 g of NPK fertilizer as a basal treatment in each planting *** regulate the soil acidity to pH 4,we added FeSO_(4) and allowed the mixture to incubate for 30 *** results demonstrate that the application of three types of organic fertilizers chicken manure(P1),oil palm empty bunch fertilizer(P2),and vermicompost(P3)positively impacts the growth of three soybean *** findings indicate that the application of P2 organic fertilizer can increase vegetative growth almost 50%in soybeans on acidic soil,including plant height,leaf count,and root ***,applying P3 organic fertilizer can boost reproductive growth responses in soybeans on acidic soil,such as pod number(from around 0-4 unit to 42-51 unit),grain number(from around 0-5 unit to 88-90 unit),and grain weight(from around 0-0.37 g to 12-25 g).Organic fertilizer has the potential to regulate soil pH,promoting higher yields of soybeans under acidic stress.

关键词： Organic fertilizer Acidic stress Soybean Agriculture production

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铝电解槽不同铝水平高度电热场模拟对比

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有色金属工程 2024年第10期14卷 73-80页

作者：于帅康邓胜祥 Johnson yap 上海工程技术大学机械与汽车工程学院能源与动力工程系上海201620 上海工程技术大学新能源及节能新技术国际实验室上海201620 SCORE EPCC SDN BHD BintuluMalaysia

铝水平高度是铝电解过程中的重要指标,合适的铝水平可保持良好的槽内物理场使电解槽稳定生产。因此,找到合适的铝水平高度对电解槽良好工作至关重要。利用SOLiDWORKS建模软件绘制了四组350 kA不同铝水平电解槽,通过COMSOL仿真软件分别... 详细信息

铝水平高度是铝电解过程中的重要指标,合适的铝水平可保持良好的槽内物理场使电解槽稳定生产。因此,找到合适的铝水平高度对电解槽良好工作至关重要。利用SOLiDWORKS建模软件绘制了四组350 kA不同铝水平电解槽,通过COMSOL仿真软件分别对四组不同铝水平电解槽电场及热场进行模拟并对比某厂350 kA电解槽现场测试数据,验证了模拟准确性。发现随着铝水平的不断升高,电解槽内电势、电流密度及整体温度均呈下降趋势。通过电场热场对比,认为350 kA电解槽铝水平位于20~22 cm区间为最优,压降为3630~3810 mV,槽内高温约为950℃。

关键词：铝电解槽铝水平电场热场仿真模拟

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Promotional Effect of Bismuth as Dopant in Bi-Doped Vanadyl Pyrophosphate Catalysts for Selective Oxidation of n-Butane to Maleic Anhydride

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Journal of Natural Gas Chemistry 2006年第4期15卷 297-302页

作者： y.H.Taufiq-yap y.Kamiya K.P.Tan Department of Chemistry Universiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Graduate School of Environmental Earth Science Hokkaido UniversitySapporo 060-0810Japan

Bismuth-promoted （1% and 3%） vanadyl pyrophosphate catalysts were prepared by refluxing Bi（NO3）4.5H2O and VOPO4.2H2O in isobutanol. The incorporation of Bi into the catalysts lattice increased the surface area and lowered the overall V oxidation state. Profiles of temperature programmed reduction （TPR） in H2 show a significant shift of the maxima of major reduction peaks to lower temperatures for the Bi-promoted catalysts. A new peak was also observed at the low temperature region for the catalyst with 3% of Bi dopant. The addition of Bi also increased the total amount of oxygen removed from the catalysts. The reduction pattern and reactivity information provide fundamental insight into the catalytic properties of the catalysts. Bi-promoted catalysts were found to be highly active （71% and 81% conversion for 1% and 3% Bi promoted catalysts, respectively, at 703 K）, as compared to the unpromoted material （47% conversion）. The higher activity of the Bi-promoted catalysts is due to that these catalysts possess highly active and labile lattice oxygen. The better catalytic performance can also be attributed to the larger surface area.

关键词： bismuth promoter vanadyl pyrophosphate n-butane oxidation

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Mechanosynthesis and mechanochemical treatment of bismuth-doped vanadium phosphorus oxide catalysts for the partial oxidation of n-butane to maleic anhydride

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Journal of Natural Gas Chemistry 2008年第3期17卷 232-237页

作者： y. H. Taufiq-yap y.C. Wong y. Kamiya W.J. Tang Putra Center for Catalysis Science and Technology Department of Chemistry Faculty of Science Universiti Putra Malaysia 43400 UPM Serdang Selangor Darul Ehsan Malaysia Graduate School of Environmental Science Hokkaido Universit3 Sapporo 060-0810 Japan

Three Bi-doped vanadyl pyrophosphate catalysts were prepared via dihydrate route （VPD method）, which consisted of different preparation methods including mechanosynthesis, mechanochemical treatment, and the conventional reflux method. The catalysts produced by the above three methods were characterized by x-ray diffraction （XRD）, scanning electron microscopy （SEM）, and temperature programmed reduction （TPR）. Catalytic evaluation for the partial oxidation of n-butane to maleic anhydride （MA） was also carried out. The XRD patterns of all the Bi-doped catalysts showed the main peaks of pyrophosphate phase. Lower intensity peaks were observed for the mechanochemically treated Bi-doped catalyst （VPDBiMill） with two additional small peaks corresponding to the presence of a small amount of V5＋ phase. The TPR profiles showed that the highest amount of active oxygen species, i.e, V4＋–O- pair, responsible for n-butane activation, was removed from VPDBiMill. Furthermore, from the catalytic test results, the graph of selectivity to MA as a function of the conversion of n-butane demonstrated that VPDBiMill was the most selective catalyst. This suggests that the mechanochemical treatment of vanadium phosphate catalyst （VPDBiMill） is a potential method to improve the catalytic properties for the partial oxidation of n-butane to maleic anhydride.

关键词： mechanosynthesis mechanochemical treatment bismuth vanadyl pyrophosphate

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释放多孔纳米结构的活力:可持续电催化水分解

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Chinese Journal of Catalysis 2024年第3期58卷 37-85页

作者：罗健颖傅捷叶丰铭梁汉锋王伟俊厦门大学马来西亚分校能源与化工学院马来西亚雪兰莪州厦门大学马来西亚分校纳米能源与催化技术卓越中心(CONNECT)马来西亚雪兰莪州厦门大学化学与化工学院固体表面物理化学国家重点实验室福建厦门361005 厦门大学古雷创新学院福建漳州363200 厦门大学深圳研究院广东深圳518057

电化学整体水分解(OWS)作为一种很有应用前景的能源转换技术,可用于生产清洁的可再生氢燃料,引起了人们的广泛关注.然而,水分解反应的半反应,即析氧反应(OER),因动力学缓慢、水分解热力学势垒高和能量消耗大等问题制约了OWS的广泛应用.... 详细信息

电化学整体水分解(OWS)作为一种很有应用前景的能源转换技术,可用于生产清洁的可再生氢燃料,引起了人们的广泛关注.然而,水分解反应的半反应,即析氧反应(OER),因动力学缓慢、水分解热力学势垒高和能量消耗大等问题制约了OWS的广泛应用.研究发现,采用地球储量丰富的元素设计的多孔材料可以显著提高活性位点数量及其可及性,增大比表面积,优化反应物的吸附/脱附,改善传质,进而表现出较好的电催化活性.因此,系统梳理总结多孔纳米材料在电催化分解水领域的研究进展具有重要的意义.本文综述了近年来用于析氢反应,OER和OWS的多孔电催化剂的研究进展.聚焦于合成策略的最新进展,并结合多孔结构在电催化剂中的独特作用进行了讨论.概述了各种新兴的多孔电催化剂改性策略,包括结构工程、相工程、缺陷工程和应变工程;重点介绍了合成方法、多孔材料性能提升、机理理解、集成实验、水分解的理论研究和先进的改性策略,并提出了合成工艺.特别总结了结构-活性关系的研究成果,为设计和改性具有独特性能的多孔材料提供参考.最后,本文强调了当前多孔电催化剂所面临的科学挑战和未来发展方向,旨在为推动多孔电催化剂在电化学水分解领域的应用和发展提供借鉴.

关键词：多孔材料电催化析氢反应析氧反应水分解

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n-Butane Oxidation over γ-Al_2O_3 Supported Vanadium Phosphate Catalysts

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Journal of Natural Gas Chemistry 2007年第3期16卷 266-272页

作者： y.H.Taufiq-yap L.K.Leong R.irmawati Putra Laboratory for Catalysis Science and Technology Department of ChemistryFaculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Bioscience and Chemistry Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanJalan Genting Kelang53300 SetapakKuala LumpurMalaysia

Four vanadium phosphate catalysts supported on γ-A1203 （20 wt%） were synthesized via wetness impregnation of VOHPO4.0.5H2O precursor and calcined for different durations （6, 10, 30 and 75 h） at 673 K in a reaction flow of n-butane/air mixture. The samples calcined for 6 and 10 h produced only a single phase of （VO）2P2O7. However, the VOPO4 phase （β-VOPO4） was detected and became more prominent with only a minor pyrophosphate peaks were found after 30 h of calcination. All these pyrophosphate peaks disappeared after 75 h of calcination. The formation of V^5＋ phase was also observed in the SEM micrographs. The redox properties and the nature of oxidants of the catalysts employed in this study were investigated by H2-TPR analysis. Selective oxidation of n-butane to maleic anhydride （MA） over these catalysts shows that the percentage of n-butane conversion decreases with the transformation of the catalysts from V^4＋ to V^5＋ phases. An appropriate ratio of V^5＋/V^4＋ can enhance the performance of the VPO catalyst. However, a higher amount of V^5＋ and its associated oxygen species are responsible to promote the MA selectivity.

关键词： n-butane oxidation VPO alumina maleic anhydride

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Recent advances in structural modification on graphitic carbon nitride(g-C_(3)N_(4))-based photocatalysts for high-efficiency photocatalytic H_(2)O_(2)production

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Nano Research Energy 2024年第1期3卷 101-151页

作者： Feng Ming yap Grayson Zhi Sheng Ling Brenden Jing Su Jian yiing Loh Wee-Jun Ong School of Energy and Chemical Engineering Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia Center of Excellence for NaNo Energy&Catalysis Technology(CONNECT) Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Gulei innovation institute Xiamen UniversityZhangzhou 363200China Shenzhen Research institute of Xiamen University Shenzhen 518057China

To date,extensively high demand for hydrogen peroxide(H_(2)O_(2))has been predominantly supplied by the anthraquinone process for several worldwide applications,encompassing wastewater treatment,environmental remediation,and chemical ***,the compacted manufacturing,massive energy input and the release of tremendous wastes have restricted commercialization *** to mitigate such issues,the photocatalytic H_(2)O_(2)production by utilizing g-C_(3)N_(4)catalysts has endowed a greener,sustainable and promising alternative,considering that it involves water and oxygen as reactants in the present of sunlight as energy ***,we have manifested a comprehensive overview of the research progress for g-C_(3)N_(4)-based semiconductors for photocatalytic H_(2)O_(2)*** review has systematically elucidated state-of-the-art development of different modifications on g-C_(3)N_(4)to unravel the fundamental mechanism of H_(2)O_(2)evolution via oxygen reduction reaction(ORR)and water oxidation reaction(WOR).in addition,the contribution made by vacancy introduction,doping,heterogenization,and co-catalyst passivation with respect to photoefficiency enhancement have been ***,the current challenges and perspective of future development directions on photocatalytic H_(2)O_(2)production have also been *** such,g-C_(3)N_(4)stands as the next step toward advancement in the configuration and modulation of high-efficiency photocatalysts.

关键词： photocatalysis g-C_(3)N_(4) H_(2)O_(2)production structural modification

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Synthesis of self-assembled nanorod vanadium oxide bundles by sonochemical treatment

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Journal of Natural Gas Chemistry 2009年第3期18卷 312-318页

作者： y.H.Taufiq-yap y.C.Wong Z.Zainal M.Z.Hussein Centre of Excellence for Catalysis Science and Technology Faculty of ScienceUniversiti Putra Malaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia

Self-assembled nanorod of vanadium oxide bundles were synthesized by treating bulk V2O5 with high intensity sonochemical technique. The synthesized materials were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, transmission electron microscope （TEM） and temperature-programmed reduction （TPR） in H2. Catalytic behaviour of the materials over anaerobic n-butane oxidation was studied through temperature-programmed reaction （TPRn）. Catalytic evaluation of the sonochemical treated V2O5 products was also studied on microreactor. XRD patterns of all the vanadium samples were perfectly indexed to V2O5. The morphologies of the nanorod vanadium oxides as shown in SEM and TEM depended on the duration of the ultrasound irradiation. Prolonging the ultrasound irradiation duration resulted in materials with uniform, well defined shapes and surface structures and smaller size of nanorod vanadium oxide bundles. H2-TPR profiles showed that larger amount of oxygen species were removed from the nanorod V2O5 compared to the bulk. Furthermore, the nanorod vanadium oxide bundles, which were produced after 90, 120 and 180 min of sonochemical treatment, showed an additional reduction peak at lower temperature （-850 K）, suggesting the presence of some highly active oxygen species. TPRn in n-butane/He over these materials showed that the nanorod V2O5 with highly active oxygen species showed markedly higher activity than the bulk material, which was further proven by catalytic oxidation of n-butane.

关键词： nanorod vanadium oxide sonochemical treatment butane oxidation

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Graphene Oxide-Based Q-Switched Erbium-Doped Fiber Laser

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Chinese Physics Letters 2013年第2期30卷 124-127页

作者： y.K.yap N.M.Huang S.W.Harun H.Ahmad Photonics Research Centre Department of PhysicsFaculty of ScienceUniversity of Malaya50603 Kuala LumpurMalaysia Low Dimensional Materials Research Centre Department of PhysicsFaculty of ScienceUniversity of Malaya50603 Kuala LumpurMalaysia Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Nanotechnology Research Alliance Universiti Teknologi Malaysia81310 UTMJohore BahruJohor Darul TakzimMalaysia

We demonstrate a pulsed ring erbium-doped fiber laser based on graphene oxide(GO),employing a simplified Hummer's method to synthesize the GO via chemical oxidation of graphite flakes at room *** dipping a fiber ferrule end face onto the GO suspension,GO is successfully coated onto the end face,making it a simple saturable absorption device.A stable Q-switched pulsed fiber laser is achieved with a low pump threshold of 9.5 mW at 980 *** pulse repetition rate ranges from 16.0 to 57.0 *** pulse width and the pulse energy are studied and discussed.

关键词： temperature. fiber pulse

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