Xiaojun Wu

University of Science and Technology of China

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Haifeng Lv

University of Science and Technology of China

Jinlong Yang

University of Science and Technology of China

Li Song

Binzhou University

Xiao Cheng Zeng

City University of Hong Kong

Shuangming Chen

National Synchrotron Radiation Laboratory

Zhiwen Zhuo

University of Science and Technology of China

Changzheng Wu

University of Science and Technology of China

Yan Yu

University of Science and Technology of China

Yi Xie

Collaborative Innovation Center of Chemistry for Energy Materials

Yu Yao

Hefei National Center for Physical Sciences at Nanoscale

Cooperative Institutions

University of Science and Technology of China

669

Chinese Academy of Sciences

563

Hefei National Center for Physical Sciences at Nanoscale

299

Collaborative Innovation Center of Chemistry for Energy Materials

249

National Synchrotron Radiation Laboratory

210

University of Chinese Academy of Sciences

209

Hefei University

160

Peking University

137

Shanghai Jiao Tong University

135

Sun Yat-sen University

117

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Carbon Nanotubes/Hydrophobically Associated Hydrogels as Ultrastretchable, Highly Sensitive, Stable Strain, and Pressure Sensors

ACS Applied Materials & Interfaces (2020)

Zhihui Qin Xia Sun Qingyu Yu Haitao Zhang Xiaojun Wu

Conductive hydrogels have become one of the most promising materials for skin-like sensors because of their excellent biocompatibility and mechanical flexibility. However, the limited stretchability, low toughness, and fatigue resistance lead to a narrow sensing region and insufficient durability of the hydrogel-based sensors. In this work, an extremely stretchable, highly tough, and anti-fatigue conductive nanocomposite hydrogel is prepared by integrating hydrophobic carbon nanotubes (CNTs) into hydrophobically associated polyacrylamide (HAPAAm) hydrogel. In this conductive hydrogel, amphiphilic sodium dodecyl sulfate was used to ensure uniform dispersion of CNTs in the hydrogel network, and hydrophobic interactions between the hydrogel matrix and the CNT surface formed, greatly improving the mechanical properties of the hydrogel. The obtained CNTs/HAPAAm hydrogel showed excellent stretchability (ca. 3000%), toughness (3.42 MJ m-3), and great anti-fatigue property. Moreover, it exhibits both high tensile strain sensitivity in the wide strain ranges (gauge factor = 4.32, up to 1000%) and high linear sensitivity (0.127 kPa-1) in a large-pressure region within 0-50 kPa. The CNTs/HAPAAm hydrogel-based sensors can sensitively and stably detect full-range human activities (e.g., elbow rotation, finger bending, swallowing motion, and pronouncing) and handwriting, demonstrating the CNTs/HAPAAm hydrogel's potential as the wearable strain and pressure sensors for flexible devices.

Gauge factor

10.1021/acsami.9b21659

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Citations (311)

Stable Metallic 1T‐WS₂ Nanoribbons Intercalated with Ammonia Ions: The Correlation between Structure and Electrical/Optical Properties

Advanced Materials (2015)

Qin Liu Xiuling Li Zhangru Xiao Yu Zhou Haipin Chen

Stable metallic 1T-WS2 nanoribbons with zigzag chain superlattices, highly stabilized by ammonia-ion intercalation, are produced using a facile bottom-up process. The atomic structure of the nanoribbons, including W-W reconstruction and W-S distorted octahedral coordination, results in distinctive electrical transport and optical Raman scattering properties that are very different from semiconducting 2H-WS2 . The correlations between structure and properties are further confirmed by theory calculations.

Zigzag

10.1002/adma.201502134

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Citations (227)

Metal–Sulfur Interfaces as the Primary Active Sites for Catalytic Hydrogenations

Journal of the American Chemical Society (2024)

Weiming Chen Yixuan Che Jing Xia Lirong Zheng Haifeng Lv

The determination of catalytically active sites is crucial for understanding the catalytic mechanism and providing guidelines for the design of more efficient catalysts. However, the complex structure of supported metal nanocatalysts (e.g., support, metal surface, and metal-support interface) still presents a big challenge. In particular, many studies have demonstrated that metal-support interfaces could also act as the primary active sites in catalytic reactions, which is well elucidated in oxide-supported metal nanocatalysts but is rarely reported in carbon-supported metal nanocatalysts. Here, we fill the above gap and demonstrate that metal-sulfur interfaces in sulfur-doped carbon-supported metal nanocatalysts are the primary active sites for several catalytic hydrogenation reactions. A series of metal nanocatalysts with similar sizes but different amounts of metal-sulfur interfaces were first constructed and characterized. Taking Ir for quinoline hydrogenation as an example, it was found that their catalytic activities were proportional to the amount of the Ir-S interface. Further experiments and density functional theory (DFT) calculations suggested that the adsorption and activation of quinoline occurred on the Ir atoms at the Ir-S interface. Similar phenomena were found in

Nanomaterial-based catalyst

Quinoline

10.1021/jacs.4c02692

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Enamel-like Layer of Nanohydroxyapatite Stabilizes Zn Metal Anodes by Ion Exchange Adsorption and Electrolyte pH Regulation

ACS Nano (2022)

Kaiwen Qi Weiduo Zhu Xiaotan Zhang Mengke Liu Huaisheng Ao

The instability of Zn anode caused by severe dendrite growth and side reactions has restricted the practical applications of aqueous zinc-ion batteries (AZIBs). Herein, an enamel-like layer of nanohydroxyapatite (Ca5(PO4)3(OH), nano-HAP) is constructed on Zn anode to enhance its stability. Benefiting from the ion exchange between Zn2+ and Ca2+, the adsorption for Zn2+ in enamel-like nano-HAP (E-nHAP) layer can effectively guide Zn deposition, ensuring homogeneous Zn2+ flux and even nucleation sites to suppress Zn dendrites. Meanwhile, the low pH of acidic electrolyte can be regulated by slightly soluble nano-HAP, restraining electrolyte corrosion and hydrogen evolution. Moreover, the E-nHAP layer features high mechanical flexibility due to its enamel-like organic-inorganic composite nanostructure. Hence, symmetric cells assembled by E-nHAP@Zn show superior stability of long-term cycling at different current densities (0.1, 0.5, 1, 5, and 10 mA cm-2). The E-nHAP@Zn∥E-nHAP@Cu cell exhibits an outstanding cycling life with high Coulombic efficiency of 99.8% over 1000 cycles. Notably, the reversibility of full cell based on CNT/MnO2 cathode can be effectively enhanced. This work shows the potential of drawing inspiration from biological nanostructure in nature to develop stable metal electrodes.

10.1021/acsnano.2c02448

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Citations (57)

Acid-durable electride with layered ruthenium for ammonia synthesis: boosting the activity via selective etching

Chemical Science (2019)

Jiang Li Jiazhen Wu Haiyun Wang Yangfan Lu Tian‐Nan Ye

Ruthenium (Ru) loaded catalysts are of significant interest for ammonia synthesis under mild reaction conditions. The B5 sites have been reported as the active sites for ammonia formation, i.e., Ru with other coordinations were inactive, which has limited the utilization efficiency of Ru metal. The implantation of Ru into intermetallic compounds is considered to be a promising approach to tune the catalytic activity and utilization efficiency of Ru. Here we report an acid-durable electride, LnRuSi (Ln = La, Ce, Pr and Nd), as a B5-site-free Ru catalyst. The active Ru plane with a negative charge is selectively exposed by chemical etching using disodium dihydrogen ethylenediaminetetraacetate (EDTA-2Na) acid, which leads to 2-4-fold enhancement in the ammonia formation rate compared with that of the original catalyst. The turnover frequency (TOF) of LnRuSi is estimated to be approximately 0.06 s-1, which is 600 times higher than that of pure Ru powder. Density functional theory (DFT) calculations revealed that the dissociation of N2 occurs easily on the exposed Ru plane of LaRuSi. This systematic study provides firm evidence that layered Ru with a negative charge in LnRuSi is a new type of active site that differs significantly from B5 sites.

Ammonia production

10.1039/c9sc01539f

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Citations (53)

Organometallic Hexahapto-Functionalized Graphene: Band Gap Engineering with Minute Distortion to the Planar Structure

The Journal of Physical Chemistry C (2013)

Jun Dai Yu Zhao Xiaojun Wu Xiao Cheng Zeng Jinlong Yang

Motivated from experimentally realized Cr-chemisorbed graphene, we have systematically explored the electronic properties of organometallic complexes of graphene with covalent monohexahapto-TM (TM = Cr, Fe, Ni) bonds using density-functional theory (DFT) calculations. We show that besides Cr, Fe and Ni can also bind strongly with the graphene. At the experimentally suggested coverage ratio (TM:C = 1:18, TM = Cr, Fe, Ni), our calculations suggest that the computed band gap of perfectly arranged networks of (η6-graphene)-Cr(CO)3, (η6-graphene)-Fe(CO)2, and (η6-graphene)-NiCO can be enlarged to 1.08, 0.61, and 0.29 eV, respectively. The inconsistency between the computed gap (1.08 eV) and the experimental gap (∼10 meV) for the (η6-graphene)-Cr(CO)3 is explained, which is possibly due to the existence of regions with relatively lower coverage ratio, in view of the much smaller band gap for (η6-graphene)-Cr(CO)3 with Cr:C = 1:32 (54 meV) and with Cr:C = 1:50 (20 meV), respectively. Both band gap values are much closer to the measured band gap (∼10 meV). Yet, the functionalized graphene shows little structural distortion from its original planar structure. The notable features of the direct band gaps along with the planar structure render the TM-functionalized graphenes quite appealing for applications not only in nanoelectronics but also in optoelectronics such as the infrared detector and solar cell photoanode.

Nanoelectronics

10.1021/jp408347w

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Citations (30)

sigRGCN: A robust residual graph convolutional network for scRNA-seq data clustering

Zhenqiu Shu Min Xia Kaiwen Tan Zhengtao Yu Xiaojun Wu

Clustering is a crucial step in single-cell RNA sequencing (scRNA-seq) data analysis, facilitating the discovery of new cell types and the grouping of similar cells. Recently, graph convolutional networks (GCNs) have gained prominence in scRNA-seq data clustering because they effectively learn cell representations by capturing the relationship between cells. However, GCNs are sensitive to noise in scRNA-seq data and are prone to over-smoothing, resulting in the loss of cell-specific information. To overcome these challenges, we propose sigRGCN, a robust residual graph convolutional network for scRNA-seq data clustering. Specifically, we first construct a disturbed cell graph by injecting noise into a cell graph constructed from scRNA-seq data. Then, we design a graph structure optimization graph convolutional network to eliminate the impact of noise in the disturbed cell graph. It significantly improves the robustness of the proposed model in real scRNA-seq data clustering tasks. After that, we utilize a L-layers residual graph convolutional network to alleviate the over-smoothing problem. It allows our model to effectively capture higher-order relationships between cells, leading to better cell representations. Finally, we employ a self-supervised manner to optimize our model. The experimental results on nine real scRNA-seq datasets show that our proposed model demonstrates competitive performance in real clustering tasks. Our source code for this work is available at https://github.com/szq0816/sigRGCN.

Clustering coefficient

10.1109/tcbbio.2024.3515053

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A New Two-Dimensional Functional Material with Desirable Bandgap and Ultrahigh Carrier Mobility

arXiv (Cornell University) (2018)

Ning Lü Zhiwen Zhuo Hongyan Guo Ping Wu Wei Fa

Two-dimensional (2D) semiconductors with direct and modest bandgap and ultrahigh carrier mobility are highly desired functional materials for nanoelectronic applications. Herein, we predict that monolayer CaP3 is a new 2D functional material that possesses not only a direct bandgap of 1.15 eV (based on HSE06 computation), and also a very high electron mobility up to 19930 cm2 V-1 s-1, comparable to that of monolayer phosphorene. More remarkably, contrary to the bilayer phosphorene which possesses dramatically reduced carrier mobility compared to its monolayer counterpart, CaP3 bilayer possesses even higher electron mobility (22380 cm2 V-1 s-1) than its monolayer counterpart. The bandgap of 2D CaP3 can be tuned over a wide range from 1.15 to 0.37 eV (HSE06 values) through controlling the number of stacked CaP3 layers. Besides novel electronic properties, 2D CaP3 also exhibits optical absorption over the entire visible-light range. The combined novel electronic, charge mobility, and optical properties render 2D CaP3 an exciting functional material for future nanoelectronic and optoelectronic applications.

Phosphorene

Electron Mobility

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Enhanced Fenton-like process over Cu/L(+)-ascorbic acid co-doping mesoporous silica for toxicity reduction of emerging contaminants

Frontiers of Environmental Science & Engineering (2023)

Yuhang Liu Wenxuan Deng Xiaojun Wu Chun Hu Lai Lyu

Abstract Effective removal of emerging contaminants (ECs) to minimize their impacts on human health and the natural environment is a global priority. For the removal of ECs in water, we fabricated a seaweed spherical microsphere catalyst with Cu cation- π structures by in situ doping of Cu species and ascorbic acid in mesoporous silica (Cu-C-MSNs) via a hydrothermal method. The results indicate that bisphenol A (BPA) is substantially degraded within 5 min under natural conditions, with its biological toxicity considerably weakened. Moreover, industrial wastewater could also be effectively purified by Cu-C-MSNs/H 2 O 2 system. The presence of metal sites and the complexation of ECs via cation- π interaction and π - π stacking on the catalyst surface were directly responsible for the polarization distribution of electrons, thus activating H 2 O 2 and dissolved oxygen (DO). The removal of contaminants could be attributed primarily to 1) the activation of H 2 O 2 into • OH to attack the contaminants and 2) self-cleavage because of the transfer of electrons from the contaminants to the catalysts. This study provides an innovative solution for the effective treatment of ECs and has positive implications for easing global environmental crises.

10.1007/s11783-024-1804-7

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Selection Rules of Transition Metal Dopants for Prussian Blue Analogs Enabling Highly Reversible Sodium Storage

Advanced Energy Materials (2024)

Ling Li Jialong Shen Hai Yang Zhen Li Zhihao Chen

Abstract Rational element doping is demonstrated as an effective strategy to optimize crystal stability and enhance the electronic conductivity of Prussian blue analogs (PBAs) to achieve a satisfactory sodium storage performance. However, unraveling the dopant selection principles is still a big challenge. Herein, the integrated crystal orbital Hamilton population (ICOHP) function is adopted to evaluate the strength of chemical bonds of N‐transition metals (N‐TM) and guide the dopant selection. Among the series of ICOHP values for N‐TM (TM = Mn, Fe, Co, Ni, Cu, Zn), the Cu─N bond exhibits the lowest ICOHP value, which indicates that Cu doping can improve the stability of PBAs compared to other dopants. Experimentally, among TM‐substituted Fe‐based PBAs (TMFeHCFs), the as‐prepared sample with 20 at.% Cu doping (CuFeHCF‐2) exhibits the best cycling performance, with a capacity retention of 83.5% after 400 cycles at 1 C, which is consistent with the theoretical calculation results. In addition, in situ XRD and in situ, Raman reveal a highly reversible monoclinic‐cubic two‐phase conversion and redox‐active pairs, respectively. This study provides valuable guidelines for dopant selection to enhance the performance of PBAs cathodes.

Prussian blue

10.1002/aenm.202401729

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Citations (15)