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Nano-sized niobium-based oxides anchored on biomass-derived porous carbon hybrids as bifunctional catalysts for dye-sensitized solar cells and alkaline hydrogen evolution

Nano-sized niobium-based oxides anchored on biomass-derived ...

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第七届新型太阳能电池材料科学与技术学术研讨会

作者：司艺铭 Feng Han Yongwei Zhang Jingwen Li Xinying Qiao Menglong Sun Lishan Zhang Xi Wang Jiaoe Dang 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

The development of clean-renewable energy and efficient electrocatalysts for dye-sensitized solar cells(DSSCs) and hydrogen evolution reaction(HER) to alleviate environmental pollution and energy shortage is an ongoing challenge for mankind.Platinum(Pt)-based materials,as traditional catalyst materials,are widely used in DSSCs and HER due to their excellent catalytic performance and electrical conductivity.However,the high cost and scarcity also seriously limit the large-scale commercial application of energy devices.Transition metal compounds possess superior catalytic performance for DSSC and HER but poor electrical conductivity.It has proved that combination of TMC and biomass carbon effectively improve the overall catalytic performance of composite materials.Herein,we successfully synthesized CrNbO and CrNbO/APPC by a facile co-precipatation method and used as electrocatalysts for DSSC and HER.The CrNbO and CrNbO/APPC as electrocatalysts in DSSC obtain device efficiencys of 2.54% and 7.09%,respectively.Furthermore,the CrNbO/APPC is developed as electrocatalyst for HER and delivers a low overpotential of 134.6 mV at 10 mA cm and Tafel slope of 80 mV dec in 1 M KOH.This work provides an excellent strategy to develop robust and cost-effective multifunctional electrocatalysts for various catalytic fields.

关键词： Dye-sensitized solar cell hydrogen evolution reaction Catalysts Co-precipitation Niobium-based oxide Bio-based carbon

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Two isostructural Co/Ni-MOF materials: synthesis, crystal structures and electrochemical properties

Two isostructural Co/Ni-MOF materials: synthesis, crystal st...

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2018年中西部地区无机化学化工学术研讨会

作者： Wang Xiao Ya-Pan Wu Xiao-Kun Wang Jing-Wei Yi Dong-Sheng Li College of Materials and Chemical Engineering China Three Gorges University

In recent years, metal-organic frameworks(MOFs) has shown potential applications such as gas sorption and separation, chemical sensing, magnetism, molecular recognition and catalysis due to tailored structures, high surface area, tunable pore size and channels and unsaturated active sites[1-3].Herein, an undeveloped 1,3-di(3’,5’-dicarboxylphenyl)benzene(H4 Ddbp) ligand is employed to build two uncommon isostructural Co/Ni-MOFs materials. The electrocatalytic hydrogen evolution reaction of Co/Ni-MOF confirm that the activity of Co-MOF is superior to that of Ni-MOF, which achieve low overpotential of 249 m V and a small Tafel slope of 107 m V·dec-1 under the current density of 10 mA·cm.

关键词： 1,3-di（3’,5’-dicarboxylphenyl）benzene Co/Ni-MOFs water splitting hydrogen evolution reaction

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Boosting hydrogen Production by Anodic Oxidation of Primary Amines over a NiSe Nanorod Electrode

Boosting Hydrogen Production by Anodic Oxidation of Primary ...

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中国化学会2019年中西部地区无机化学化工学术研讨会

作者：黄义张兵 Department of Chemistry School of Science Tianjin University

For electrocatalytic water splitting,the sluggish anodic oxygen evolution reaction (OER) restricts the cathodic hydrogen evolution reaction (HER).Therefore,developing an alternative anodic reaction with accelerating kinetics to produce value-added chemicals,especially coupled with HER,is of great importance.Now,a thermodynamically more favorable primary amine (-CH-NH)electrooxidation catalyzed by NiSe nanorod arrays in water is reported to replace OER for enhancing HER (Figure 1).The increased H production can be obtained at cathode;meanwhile,a variety of aromatic and aliphatic primary amines are selectively electrooxidized to nitriles with good yields at the anode.Mechanistic investigations suggest that Ni /Ni may serve as the redox active species for the primary amines transformation.Hydrophobic nitrile products can readily escape from aqueous electrolyte/electrode interface,avoiding the deactivation of the catalyst and thus contributing to continuous gram-scale synthesis.

关键词： Electrocatalysis hydrogen evolution reaction primary amine oxidation in-situ Raman

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Dentritic PdAgCu nanosheets for enhanced electrocatalytic activity

Dentritic PdAgCu nanosheets for enhanced electrocatalytic ac...

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中国化学会2019年中西部地区无机化学化工学术研讨会

作者： Wenya Lu Si Cheng College of Chemistry Chemical Engineering and Materials Science Soochow University

Two-dimensional（2D） metal nanomaterials as electrocatalysts have recently been the research focus, owing to their unusual physiochemical properties.[1-3] Unfortunately, Simple and safety preparation methods of surfacecleaned 2D materials are still lacking. Here, we report an one-pot facile strategy for the preparation of dentritic PdAgCu alloy nanosheets without the existent of CO gas and high temperature. Due to their unique structure and possible synergetic effect, the ultrathin nanosheets show high electrocatalytic activity in hydrogen evolution reaction. The developed method is also expected to generate exciting opportunities in creating mutimatellic 2D nanostructures for various catalytic applications.

关键词： dentritic nanosheets hydrogen evolution reaction

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Metal-organic frameworks supported MoS2 nanosheets as effective catalysts for electrocatalytic hydrogen evolution

Metal-organic frameworks supported MoS2 nanosheets as effect...

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中国化学会第九届全国无机化学学术会议

作者： Jundong Yi Yuanbiao Huang Rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences

As we all know, hydrogen energy is an ideal, clean and efficient secondary energy resource. It serves as one of the most promising candidates for replacing petroleum fuels in the future. Toward this end, one effective approach to hydrogen production is based on environmentally friendly electrochemical water-splitting. Although some noble metals such as Platinum and Palladium are well-known for their superior electrocatalytic property in the HER（hydrogen evolution reaction）, large-scale application of them is limited due to their high prices and global low availabilities. It remains a great challenge to develop inexpensive, highly active, acid-stable HER catalysts. Since the report by Hinnemann that Mo S2 nanoparticles were active HER catalysts, the interest in using Mo S2 and related metal sulfides as water-splitting electrocatalysts has been intensified, and extensive research efforts have been devoted toward the enhancement of the catalytic activity by, for instance, loading catalysts on conductive substrates. In the present work, Mo S2 nanosheets have been grown on metal-organic frameworks via a simple one-step hydrothermal process. Due to the highly exposed edge sites and relatively low stacking height, a suitable balance and excellent HER activity can be expected.

关键词： Mo S2 Metal-Organic Frameworks hydrogen evolution reaction

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A highly efficient Mo2C hydrogen-evolution electrocatalyst with 3D hierarchical nano structure

A highly efficient Mo2C hydrogen-evolution electrocatalyst w...

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中国化学会第八届全国配位化学会议

作者： Jing Li Jianshuai Mu En-Cui Yang Xiao-Jun Zhao College of Chemistry Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry Ministry of Education Tianjin Key Laboratory of Structure and Performance for Functional Molecules Tianjin Normal University

The development of non-precious metal based electrocatalysts for hydrogen evolution reaction(HER)has received more and more attention over recent years owing to the energy andenvironment issues,and Mo based materials have been explored as a promising candidate.In this work,MoN nanoparticles and MoC with 3D hierarchical nanostructures assembled by interconnected nanoflakes were synthesized facilely via one-step high-temperature pyrolysis by adjusting the mass ratio of urea and ammonium molybdate.The MoC 3D hierarchical nanomaterials consisted of unltrasmall nanoparticles encapsulated by carbon,which owned high specific surface areas.They all exhibited efficient HER activity,and the MoC electrocatalyst with the mass ratio of 160(MoC-160)showed the best HER activity,with a small overpotential of 90 mVto reach 10 mA cm and a small Tafel slope of 50 mV dec,which was one of the most active reported MoC-based electrocatalysts.

关键词： Mo2C 3D hierarchical nanostructures hydrogen evolution reaction nonnoblemetalelectrocatalyst

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Ultrasamll Ru Nanoparticles Highly Dispersed on Sulfur Doping Graphene for HER with High Electrocatalytic Performance

Ultrasamll Ru Nanoparticles Highly Dispersed on Sulfur Dopin...

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河南省化学会2020年学术年会

作者： Yu Liu Baofan Wu Haichang Chang Xin Wang Jing Chen Xuzhuo Sun College of Chemistry and Chemical Engineering Henan University of Technology

Nanostructuring and metal-support interactions have been explored as efficient strategies to improve the electrocatalytic activity in heterogeneous catalysis.In this study,we have fabricated the ultrasmall Ru nanoparticles dispersed on S doping graphene (denoted as Ru/S-rGO) by a facile"one-pot"method.It was found that both the S doping and moderate degree of oxidization of GO can induce the formation and high dispersion of the ultrasmall Ru nanoparticles (NPs) with larger electrochemically active surface areas for exposing more active sites.Strong metal-support interaction between the S-doped graphene and Ru nanoparticles was observed from the XPS and electronic charge-differences studies.It resulted in the decrease in the electron density of Ru,which facilitated the electrons release from HO and the H–OH bond break.The results of the density functional theory (DFT) calculation further confirmed that the S dopants can reduce the energy barrier of breaking H–OH bond to accelerate the water dissociation during the alkaline HER.At current density 20 m A cm,lowest overpotential of 14 mV,superior to the benchmark Pt/C in alkaline solution,was observed for Ru/S-rGO-24.The observed lowest value of overpotential was due to the ultrasmall size,high dispersion and strong metal-support interaction.Ru/S-rGO-24 also exhibited remarkable stability and high catalytically durability in 1 M KOH solution.

关键词： Ruthenium nanoparticle S doping graphene Metal-support interaction High performance hydrogen evolution reaction

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Theoretical Studies on the Non-Noble-Metal Based hydrogen evolution Nanocatalyst

Theoretical Studies on the Non-Noble-Metal Based Hydrogen Ev...

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第十三届全国量子化学会议

作者： Wei Chen Guangtao Yu Xuri Huang Institute of Theoretical Chemistry International Joint ResearchLaboratory of Nano-Micro Architecture ChemistryJilin University

Currently, the world is facing a very serious energy and environmental crisis.Exploiting new alternative energy sources（e.g. hydrogen energy） has become an urgent problem. Water electrolysis is one promising pathway for sustainable hydrogen production, where developing highly efficient and economical catalyst can be vital. In the past few years, considerable attention has been focused on the non-noble metal electrocatalysts, such as, metal sulfides, metal selenides, metal carbides, metal nitrides,metal phosphides. Among them, some transition-metal compounds in nanoscale can exhibit an intrinsically highly catalytic activity for hydrogen evolution reaction（HER）,and may be considered as the candidate for powerful HER catalyst. Although some progress in experiment has been made, the correlative theoretical effort is rather scarce, which severely hinders the development of non-noble-metal based HER nanocatalyst, due to the insufficiency in understanding the intrinsic catalytic mechanism. To address this bottleneck problem, we have recently performed series of theoretical studies on the earth-rich transition-metal（e.g. Ni, W, Ga and Mo[1-3]）compounds to explore the structural profile at the atomic level, elucidate the catalytic mechanism and understand the catalytic reaction process by means of the first-principles computation. Additionally, we have also proposed some effective strategies to further improve the HER catalytic activity of these non-noble nanosystems. All these investigations can provide the new idea and reliable theoretical information for experimentally synthesizing the inexpensive and highly efficient HER nanocatalyst, which can be advantageous for achieving a cost reduction by avoiding the unnecessary experimental consumption from traditional trial-and-error process for optimization, and promoting the development of hydrogen energy.

关键词： Low-dimensional nanomaterial hydrogen evolution reaction Non-noble nanocatalyst First-principles computation

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Morphology-Controllable Synthesis of One Dimensional CoTe2 Nanostructures and Their Catalytic Activities for Dehydrogenation of Ammonia Borane

Morphology-Controllable Synthesis of One Dimensional CoTe2 N...

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河南省化学会2018年学术年会

作者： Gang Mi Renjie Li Yang Wang Yana Dong Jun Zhang Chemical Engineering and Pharmaceutics School Henan University of Science and Technology

Transition metal chalcogenides have been widely applied in many fields such as water splitting, catalysts, optical sensors and thermalelectric. Among them, the sulfides and selenides were more reported in the literatures than the tellurides in last decades. However, the transition metal telluride, such as nickel telluride and cobalt telluride, has attracted considerable interest in recent years duo to their potential applications in hydrogen evolution reaction(HER) and dehydrogenation of ammonia borane(AB) [1-2]. Moreover, nano morphology of transition metal telluride has a great influence on its properties. Thus, it’s significant to synthesize the transition metal telluride with controllable nanostructures. Here, series of one-dimensional CoTe nanostructures, such as nanowires(diameter ～7 nanometers), nanorods(～ 40 nm), nanotubes(～ 40 nm), were prepared by two step solvothermal method. PVP and N H·H O were employed as surfactant and reducing agent, respectively. The morphology could be easily modulated by varying reaction conditions under Nitrogen atmosphere and the products were high purity, perfectly crystalline and uniform shape. In addition, the results of catalytic activities for dehydrogenation of AB indicated that the CoTe nanowires had the best catalytic effect due to high specific surface area.

关键词： Cobalt Telluride One Dimension hydrogen evolution reaction Ammonia Borane

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Sulphur-doped nitrogen-carbon composite transition metal telluride nanohybrids: A highly efficient IRR and HER electrode catalyst

Sulphur-doped nitrogen-carbon composite transition metal tel...

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第八届新型太阳能材料科学与技术学术研讨会

作者：邓莹莹 Changwei Dang Zhuolei Liu Yinhao Wang Lishan Zhang Shuangxi Yuan Menglong Sun Xi Wang Zan Gao 云斯宁 Functional Materials Laboratory (FML) School of Materials Science and EngineeringXi’an University of Architecture and Technology

The development and design of electrode materials with an excellent catalytic activity and cyclic stability have significant importance for the further realization of large-scale applications of dye-sensitized solar cells(DSSCs) and hydrogen evolution reaction(HER). Herein, a facile and efficient method was used to introduce the melamine spong, which remarkably improved the dispersion of telluride. Benefiting from the synergistic effect of different components, the nanocomposite shows excellent catalytic performance. As electrode, the catalysts achieved a high power conversion efficiency(PCE) of 7.2% in solar cell, and exhibited an outstanding Tafel slope of 99 mV dec in electrochemical water splitting. This work not only develops a highly efficient hybrid electrocatalyst, but also provides a promising approach to perform as multifunctional catalysts in HER, triiodide reduction reaction, and in advanced clean energy production systems.

关键词： Dye-sensitized solar cells Counter electrode hydrogen evolution reaction Tellurides Electrocatalyst

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