Beijing University of Chemical Technology
Recent publications
Preference-based reinforcement learning (PbRL) is emerging as a promising approach to teaching robots through human comparative feedback without complex reward engineering. However, the substantial volume of human feedback required hinders broader applications. In this work, we introduce PrefCLM, a novel framework that utilizes crowdsourced large language models (LLMs) as synthetic teachers in PbRL. We utilize Dempster-Shafer Theory to fuse individual preference beliefs from multiple LLM agents at the score level, efficiently leveraging their diversity and collective intelligence. We also introduce a human-in-the-loop pipeline, enabling iterative and collective refinements that adapt to the nuanced and individualized preferences inherent to human-robot interaction (HRI) scenarios. Experimental results across various general RL tasks show that PrefCLM achieves competitive performance compared to expert-engineered scripted teachers and excels in facilitating more more natural and efficient behaviors. A real-world user study (N=10) further demonstrates its capability to tailor robot behaviors to individual user preferences, enhancing user satisfaction in HRI scenarios. Paper website: https://prefclm.github.io .
Graphdiyne (GDY) has been considered a promising electrode material for application in electrochemical energy storage. However, studies on GDY featuring an ordered interlayer stacking are lacking, which is supposed to be another effective way to increase lithium binding sites and diffusion pathways. Herein, we synthesized a hydrogen‐substituted GDY (HsGDY) with a highly‐ordered AA‐stacking structure via a facile alcohol‐thermal method. Such unique architecture enables a rapid lithium transfer through the well‐organized pore channels and endows a stronger adsorption capability to lithium atom as compared to the arbitrarily‐stacked mode. The resultant HsGDY exhibits a reversible capacity of 1040 mA h g⁻¹ at 0.05 A g⁻¹ ranking among the most powerful GDY‐based electrode materials, and an excellent rate performance as well as a long‐term cycling stability. The successful preparation of gram‐level high‐quality HsGDY products in batches implies the potential for large‐scale lithium‐storage applications.
Developing advanced electrolytes with high Li affinity is crucial for achieving long‐cycling lithium metal batteries (LMBs). However, the strong Li⁺‐solvent interactions in conventional electrolytes often induce difficult Li⁺ desolvation especially under low‐temperature conditions, resulting in the formation of fragile electrode interfaces involving solvents, and thus dissatisfactory cycling stability of LMBs. Herein, by introducing various diluents into the lithium hexafluorophosphate in 1, 2‐dimethoxyethane electrolyte, we reveal that Li⁺ desolvation is influenced by not only the diluent‐solvent interaction but also the diluent‐anion interaction. Based on these findings, a diluent selection parameter (DSP), which is calculated based on the product of interaction energies of diluent‐solvent/diluent‐Li⁺ and diluent‐anion/diluent‐Li⁺, is proposed for diluent selection. A diluent with a larger DSP is more favorable for promoting Li⁺ desolvation and improving the low‐temperature performance of LMBs. With the rationally selected 1, 2‐dichloroethane diluent (DSP=3.95), the Li ∥ {\parallel } Cu cell enables high Li reversibility (98.5 % after 300 cycles). Li ∥ {\parallel } LiFePO4 cell barely loses capacity at −20 °C for 300 cycles. The Li ∥ {\parallel } LiNi0.8Co0.1Mn0.1O2 cell with the anode‐to‐cathode capacity ratio of 2.7 retains 87 % capacity retention after 100 cycles. This work provides new insights into taming strong Li‐solvent interactions and offers a new paradigm for advanced electrolyte design.
A novel series of alkynyl‐linked oligomerized electron acceptors have been synthesized via Sonogashira coupling. The alkynyl linkages can enhance molecular planarity and aggregation, suppress electron‐phonon coupling, and reduce non‐radiative losses. Binary organic solar cells (OSCs) achieved an efficiency of 17.90%, with a non‐radiative loss of 0.185 eV, while ternary OSCs reached a remarkable efficiency of 19.52%. Oligomerized electron acceptors, featuring molecular weights akin to polymers and well‐defined chemical structures, have emerged as promising candidates for organic solar cells (OSCs) due to their consistent batch‐to‐batch reproducibility and improved thermal stability. In this study, we developed a series of oligomerized electron acceptors incorporating alkynyl linkages via an efficient Sonogashira coupling reaction between alkyne‐substituted Y‐type precursors and multi‐substituted iodobenzenes. This method produced monomeric (S‐Alkyne‐YF), dimeric (D‐Alkyne‐YF), and trimeric (T‐Alkyne‐YF) configurations, enabling systematic control over molecular size and substituent arms. The alkynyl linkages, characterized by high bond strength and planar geometry, enhanced molecular planarity and aggregation in films, thus facilitating precise control over morphology and phase separation in the photoactive layers. Notably, the inclusion of these linkages effectively suppressed electron‐phonon coupling, resulting in reduced non‐radiative energy losses and elevated photocarrier lifetime. OSCs based on PM6:T‐Alkyne‐YF achieved a power conversion efficiency of 17.90%, a low non‐radiative energy loss of 0.185 eV, and an open‐circuit voltage of 0.943 V. Furthermore, integrating T‐Alkyne‐YF into the D18:N3 blend yielded an exceptional PCE of 19.52%. These results underscore the potential of alkynyl‐linked oligomerized acceptors in advancing highly efficient and stable OSCs, offering a viable pathway for reducing electron‐phonon coupling and enhancing device performance.
The widespread application of aqueous zinc‐ion batteries (AZIBs) is hindered by anode dendrite formation and side reactions, reducing cycling life and performance. This study introduces Bi‐Bi₂O₃‐loaded carbon nanofibers (Bi‐Bi₂O₃@CNF) with hierarchical hollow structures and surface grooves fabricated via electrospinning, thermal treatment, and in situ growth. Experimental characterization and density functional theory reveal that the high surface area and fibrous network of Bi‐Bi₂O₃@CNF enhance electron transport and electrolyte distribution, effectively reducing ohmic resistance and concentration polarization. This “Spatial Effect” provides ample space for uniform Zn deposition. Additionally, the in situ‐grown Bi‐Bi₂O₃, pyridinic nitrogen, pyrrolic nitrogen, and C─O─Bi bonds induce strong zinc affinity and electronegativity, generating an “Electrostatic Confinement Effect” that amplifies the “spatial effect” into a “Dual‐Confinement Effect.” This synergy ensures uniform Zn deposition, suppresses dendrites and side reactions, and mitigates polarization. Compared to pure Zn anodes, Bi‐Bi₂O₃@CNF reduces polarization overpotential by 17.6%, increases hydrogen evolution overpotential by 11.52%, and maintains a Coulombic efficiency of 98.8% for over 200 h. In full cells, Zn@Bi‐Bi₂O₃@CNF//MnO₂ achieves 73.0% capacity retention after 1000 cycles at 1000 mA g⁻¹. This work provides a promising strategy for high‐efficiency, durable, and safe AZIBs and offers valuable insights into the design of advanced aqueous energy storage materials.
The electrocatalytic reduction of nitrate (eNO3⁻RR) to ammonia (NH3) across varying pH is of great significance for the treatment of practical wastewater containing nitrate. However, developing highly active and stable catalysts that function effectively in a wide pH range remains a formidable challenge. Herein, a hierarchical carbon‐based metal‐free electrocatalyst (C‐MFEC) of winged carbon coaxial nanocables (W‐CCNs, in situ generated graphene nanosheets and outside carbon layer with abundant topological defects from pristine carbon nanotubes, CNTs), is prepared through moderate oxidation of CNTs and the subsequent introduction of topological defects. The W‐CCNs feature functional separation properties, with an inner core of pristine CNTs that facilitates efficient charge transfer, while the outer shell is composed of in situ generated graphene nanosheets and carbon layers enriched with topological defects characterized by distinct carbon atom configurations, which play a crucial role in promoting the adsorption of NO3⁻, the dissociation of water, and the N─H bond formation. This innovative design enables the C‐MFEC to exhibit outstanding performance for eNO3⁻RR, operating efficiently with the NH3 yield rates of 49.5, 75.3, and 88.1 g h⁻¹ gcat.⁻¹ in acidic, neutral, and alkaline media, respectively. Such performance metrics not only outshine C‐MFECs but also rival or surpass those of certain metal‐based catalysts.
Implant‐associated infections are the most critical threat to orthopedic surgeries. Various surface‐modification strategies are developed to impart antibacterial properties and osteogenesis‐promoting abilities to the surfaces of implants. Nevertheless, a straightforward strategy for constructing a functional, stable, bioactive implant surface remains challenging. Here, a facile one‐step surface‐bioactivation method is developed that enhances both the anti‐infection capabilities and osteointegration performance of implants. This approach utilized a kind of coating that integrates antibacterial agents and osteogenesis‐promoting components directly onto the surface of titanium implants. The cationic antibacterial agent and the bone‐adhesion‐enhancing peptide are covalently attached via a Michael reaction to poly (tannic acid) (PTA) to create dual‐functional implants (Ti‐PR). The Ti‐PR surface effectively eliminated more than 99% of the common pathogenic bacteria and significantly enhanced the osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs) in vitro. The cell‐bacteria competitive culture assay on the Ti‐PR surface confirms its bactericidal and cell proliferation‐promoting properties. Additionally, RNA‐Seq analysis indicated that PI3K/Akt pathways played a crucial role in enhancing osteogenic differentiation of BMSCs. The superior anti‐infection and osteogenesis performances are confirmed in an implant‐related bone infection model in vivo. This study provided an efficient one‐step strategy for the design and production of innovative multifunctional implants.
In last few decades, the agriculture sector is facing various type of crops diseases originated by crop pests. Among various crops the tomato plant is greatly affected by many pests such as aphids and whiteflies, which are badly decreasing tomato plant yield and effecting its growth. In last few years, various type of pesticides such as Neonicotinoids and Pyrethroids are employed which are badly effecting eco‐system and water bodies. In this research work, we prepared SnO2 nanosheets (SONS) by in‐situ and green synthesis approach. Remarkably, SONS exhibit a larger surface area, tailored pore size, and higher catalytic performance than SnO2 nanoparticles (SONP). To further improve the efficiency of SONS, we coupled it with covalent organic farmwork nanosheets (COFNS) via the hydrothermal approach. The SONS@COFNS hybrid nanocatalysts exhibit improved carrier migration, enhanced porosity, multiple active sites, and exceptional light absorption capabilities. The as prepared green nanomaterials delivered improved activities for Neonicotinoids and Pyrethroids degradation. Remarkably, the most active sample 6COFNS/SONS showed the highest degradation efficiency (94 %), which is approximately 1.92 times higher than the degradation efficiency of pristine SONS (49 %). This work will ultimately contribute to developing green, ecofriendly nanomaterials for pesticides degradation and promoting tomato plants growth.
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5,615 members
Yu-Fei Song
  • Chemistry
Danhuai Guo
  • College of Information Science and Technology
Meng Wang
  • College of Life Science&Technology
Xin Dong Guo
  • College of Materials Science and Engineering (SMSE)
Dan Wang
  • College of Chemical Engineering
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Beijing, China