Publications by authors named "Guohui Tian"

Photocatalytically reducing CO into high-value-added chemical materials has surfaced as a viable strategy for harnessing solar energy and mitigating the greenhouse effect. But the inadequate separation of the photogenerated electron-hole pair remains a major obstacle to CO photoreduction. Constructing heterostructure photocatalysts with efficient interface charge transfer is a promising approach to solving the above problems.

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When humans perform pouring tasks, they exhibit consistent accuracy, regardless of the liquid type, container, or environmental conditions. This proficiency stems from their ability to effectively utilize both vision and hearing while also considering various factors. However, in the domain of robotic liquid pouring, the combination of multimodal information is effectively rarely leveraged to accomplish automatic control of robotic liquid pouring.

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Constructing heterojunction photocatalysts with optimized architecture and components is an effective strategy for enhancing CO photoreduction by promoting photogenerated carrier separation, visible light absorption, and CO adsorption. Herein, defect-rich photocatalysts (NiP@Ce-BDC-CeO HOOs) with S-scheme heterojunction and hollowed-out octahedral architecture are prepared by decomposing Ce-BDC octahedrons embedded with NiP nanoparticles and subsequent lactic acid etching for CO photoreduction. The hollowed-out octahedral architecture with multistage pores (micropores, mesopores, and macropores) and oxygen vacancy defects are simultaneously produced during the preparation process.

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The rational design of Z-scheme heterojunction hybrid photocatalysts is considered a promising way to achieve high photocatalytic activity. In this study, a dual Z-scheme heterojunction with bismuth sulfide (BiS) nanorods and bismuth oxide (BiO) nanoparticles anchored Sulfur-doped carbon nitride (S-CN) nanotubes (BiS/S-CN/BiO) is designed and fabricated through the ordinal metal ion adsorption, pyrolysis, and sulfidation processes using supramolecular rods as precursor. Compared with pristine BiS, BiO, and CN, the dual Z-scheme tube-shaped BiS/S-CN/BiO catalyst exhibited a significantly improved photocatalytic activity in amine oxidation.

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Metal-organic frameworks (MOFs) with ultrathin 2D structure have attracted remarkable attention in photocatalytic application owing to the accessibility of abundant active sites on the surface. But high charge recombination results in poor photocatalytic activity. Herein, the synthesis of ultrathin MIL-125(Ti) nanosheets is reported with a thickness of 1.

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Hollow structure hybrids have gained considerable attention for their ability to reduce CO owing to their rich active sites, high gas adsorption ability, and excellent light utilization capacity. Herein, a template-engaged strategy was provided to fabricate copper sulphide@cerium dioxide (CuS@CeO) p-n heterojunction hollow cube photocatalysts using CuO cubes as a sacrificial template. The sequential steps of loading of CeO nanolayer, sulfidation, and etching reaction facilitate the formation of CuS@CeO p-n heterojunction hollow cubes.

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The purpose of task-oriented robot cognitive manipulation planning is to enable robots to select appropriate actions to manipulate appropriate parts of an object according to different tasks, so as to complete the human-like task execution. This ability is crucial for robots to understand how to manipulate and grasp objects under given tasks. This article proposes a task-oriented robot cognitive manipulation planning method using affordance segmentation and logic reasoning, which can provide robots with semantic reasoning skills about the most appropriate parts of the object to be manipulated and oriented by tasks.

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Efficient photocatalysts are of great importance for the photochemical conversion of CO into fuels. Herein, S-scheme titanium dioxide@cobalt-nickel based metal-organic framework (TiO@CoNi-MOF) heterojunction photocatalysts with high surface area and porosity are designed and fabricated by a multi-step controllable strategy. The photocatalytic activity of the composites can be optimized by adjusting the loading content of CoNi-MOF in TiO@CoNi-MOF and molar ratios of Co and Ni in CoNi-MOF.

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In the pouring task of service robots, the robust and accurate estimate of liquid height is a crucial step. However, neither vision nor audio alone can achieve better liquid height estimation. We instead propose a visual-audio information fusion network to enable robots with good pouring skills.

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Metal-organic frameworks-based hybrids with desirable components, structures, and properties have been proven to be promising functional materials for photocatalysis and energy conversion applications. Herein, we proposed and prepared ZnSe sensitized hierarchical TiO nanosheets encapsulated MIL-125(Ti) hollow nanodisks with sandwich-like structure (MIL-125(Ti)@TiO\ZnSe HNDs) through a successive solvothermal and selenylation reaction route using the as-prepared MIL-125(Ti) nanodisks as precursor. In the ternary MIL-125(Ti)@TiO\ZnSe HNDs hybrid, TiO nanosheets were transformed from MIL-125(Ti) and in situ grown on both sides of the MIL-125(Ti) shell, forming sandwich-like hollow nanodisks, and the ratio of MIL-125(Ti)/TiO can be tuned by changing the solvothermal time.

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Exploring cheap and efficient hybrid catalysts offers exciting opportunities for enhancing the performance of photocatalysts in the green organic synthesis field. Herein, a facile and effective approach is designed for the synthesis of a sandwich-structured hybrid in which NiCo bimetallic nanoparticles are embedded in the tip of nitrogen-doped carbon nanotubes (N-CNTs) grafted on both sides of a nitrogen deficient CN (N-CN) nanosheet for photodehydrogenative coupling reactions. Such a brand-new type of sandwich-structured hybrid comprises N-CN nanosheets and surrounding N-CNTs embedded with NiCo nanoparticles at their tips.

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Constructing hybrid photocatalysts with advanced structures and controllable compositions is a promising way to improve CO photoreduction performance. In this work, SnS nanosheets are grown on ZnS polyhedron cages to fabricate hierarchical ZnS@SnS double-shelled heterostructured cages. This design integrates ZnS cages and SnS nanosheets into a stable heterostructured hybrid catalyst with a hierarchical double-shelled cage-like architecture, possessing abundant active sites, quick charge separation/migration, and high CO adsorption capacity.

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In this work, a hollow double-shelled architecture, based on n-type ZnInS nanosheet-coated p-type CuS hollow octahedra (CuS@ZnInS HDSOs), is designed and fabricated as a p-n heterojunction photocatalyst for selective CO photoreduction into CH. The resulting hybrids provide rich active sites and effective charge migration/separation to drive CO photoreduction, and meanwhile, CO detachment is delayed to increase the possibility of eight-electron reactions for CH production. As expected, the optimized CuS@ZnInS HDSOs manifest a CH yield of 28.

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Designing and constructing advanced heterojunction architectures are desirable for boosting CO photoreduction performance of semiconductor photocatalysts. Herein, we have prepared hierarchical ZnS@ZnInS core-shell cages with controlled particle sizes using sequential synthesis of Zeolitic imidazolate (ZIF-8) polyhedrons, ZnS cages, and ZnInS nanosheets on the ZnS polyhedron cages. ZIF-8 polyhedrons are firstly synthesized by a liquid-phase approach.

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Fabricating efficient photocatalysts with rapid charge carrier separation and high visible light harvesting is an advisable strategy to improve CO reduction performance. Herein, hierarchical Co Se-CdSe/MoSe /CdSe cages with sandwich-like heterostructure are prepared to act as efficient photocatalysts for CO reduction. In this study, the structure and composition of the final products can be regulated through the cation-exchange reaction in the presence of ascorbic acid.

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Here, we describe the fabrication of surface oxygen vacancy-enriched ZnFeO@TiO double-shell hollow heterostructure nanospheres (ZnFeO@H-TiO) coupled with spatially separated CoO and Au-Cu bimetallic cocatalysts. The ZnFeO@TiO heterojunction and spatially separated dual cocatalysts can significantly promote the separation of photoinduced charge carriers. Combined with the unique hollow double-shell heterostructure characteristics and improved surface state properties, the hybrid nanospheres can efficiently adsorb and activate CO molecules.

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Efficient charge separation and rapid interfacial reaction kinetics are crucial factors that determine the efficiency of photocatalytic hydrogen evolution. Herein, a fascinating 2D heterojunction photocatalyst with superior photocatalytic hydrogen evolution performance - holey CN nanosheets nested with TiO nanocrystals (denoted as HCN/TiO) - is designed and fabricated via an in situ exfoliation and conversion strategy. The HCN/TiO is found to exhibit an ultrathin 2D heteroarchitecture with intimate interfacial contact, highly porous structures and ultrasmall TiO nanocrystals, leading to drastically improved charge carrier separation, maximized active sites and the promotion of mass transport for photocatalysis.

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The low surface area, poor electrical conductivity, and rapid electron-hole recombination in bulk C3N4 limit its photocatalytic activity, which makes it challenging to improve the performance of bulk C3N4. Herein, an effective strategy is proposed to fabricate Co3O4/C3N4 heterojunctions (Co3O4 nanoparticles grown on C3N4 nanosheets), where bulk C3N4 is exfoliated to thin nanosheets. The bulk C3N4 precursor was synthesized with the hydrothermal treatment of melamine solution, and Co2+ ions were then inserted into the interlayer of the precursor through a vacuum-assisted intercalation process.

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We report the rational design and fabrication of magnetically separable zinc ferrite@titanium dioxide (ZnFeO@TiO) hollow core/shell nanospheres as photocatalysts for efficient H evolution by loading the TiO shell layer on the prepared ZnFeO hollow nanospheres using the kinetics-controlled coating method. Meanwhile, the incident light absorption, photogenerated charge transfer and separation and photocatalytic hydrogen evolution activity were remarkably improved by well anchoring cadmium selenide (CdSe) quantum dots on the ZnFeO@TiO hollow core/shell nanospheres. This unique design integrates the structural and functional merits of the ZnFeO, TiO, and CdSe quantum dots into porous hollow nanospheres with the double-shell heterostructure.

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Defective WO ultrathin surface-engineered nanosheets are fabricated by a solvothermal and low-temperature surface hydrogenation reduction strategy. The obtained defective WO ultrathin nanosheets with thicknesses of ∼4 nm possess a relatively large surface area of ∼25 m g. After surface engineering, the bandgap is narrowed to ∼2.

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In this work, BiS/MoS/BiMoO hetero-structured porous films were fabricated via a facile anion exchange process using the as-prepared BiMoO nanoflake array film as substrate material. The formation of BiS/MoS/BiMoO ternary hetero-structured porous film is both thermodynamically controllable and reaction time dependent. Systematic experiments were done to investigate the products at each reaction stage and disclose the relationships between the composite components and reaction temperature and time.

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The photocatalytic hydrogen evolution of TiO is deemed to be one of the most promising ways of converting solar energy to chemical energy; however, it is a challenge to improve the photo-generated charge separation efficiency and enhance solar utilization. Herein, black mesoporous rutile/anatase TiO microspheres with a homojunction and surface defects have been successfully synthesized by an evaporation-induced self-assembly, solvothermal and high-temperature surface hydrogenation method. The H500-BMR/ATM (H-BMR/ATM, where means the different hydrogen calcination temperatures) materials not only possess a mesoporous structure and relatively high specific surface area of 39.

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Rational architectural design and catalyst components are beneficial to improve the photoelectrochemical (PEC) performance. Herein, hierarchical SnS/CuInS nanosheet heterostructure porous films were fabricated and decorated with C to form photocathodes for PEC water reduction. Large-size CuInS nanosheet films were first grown on transparent conducting glass to form substrate films.

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Polymeric carbon nitride (CN) has emerged as the most promising candidate for metal-free photocatalysts but is plagued by low activity due to the poor quantum efficiency and low specific surface area. Exfoliation of bulk crystals into ultrathin nanosheets has proven to be an effective and widely used strategy for enabling high photocatalytic performances; however, this process is complicated, time-consuming, and costly. Here, we report a simple bottom-up method to synthesize porous few-layer CN, which involves molecule self-assembly into layered precursors, alcohol molecules intercalation, and subsequent thermal-induced exfoliation and polycondensation.

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Ag/mesoporous black TiO nanotubes heterojunctions (Ag-MBTHs) were fabricated through a surface hydrogenation, wet-impregnation and photoreduction strategy. The as-prepared Ag-MBTHs possess a relatively high specific surface area of ≈85 m  g and an average pore size of ≈13.2 nm.

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