Wenjuan Wang

Shanghai Institute of Technical Physics

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R. Zhang

Northwestern Polytechnical University

Ke Bi

Beijing University of Posts and Telecommunications

Ming Lei

Beijing University of Posts and Telecommunications

Kai Huang

Beijing University of Posts and Telecommunications

Ce Liang

Jilin University

Y. G. Wang

State Key Laboratory of Information Photonics and Optical Communications

Sen Lin

Southwest University of Science and Technology

Haolin Tang

Wuhan University of Technology

Jingxin Liu

Union Hospital

Dongyu Fan

Tangshan College

Cooperative Institutions

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Beijing University of Posts and Telecommunications

Shanghai Institute of Technical Physics

Center for Excellence in Molecular Cell Science

Zhejiang University

Tsinghua University

Tongji University

Institute of Zoology

Central South University

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Porous VOxNy nanoribbons supported on CNTs as efficient and stable non-noble electrocatalysts for the oxygen reduction reaction

Scientific Reports (2015)

Kai Huang Ke Bi Ye Lu R. Zhang Jingxin Liu

Abstract Novel nanocomposites of carbon nanotubes supported porous VO x N y nonoribbons (VO x N y -CNTs) have been synthesized by the annealing of the sol-gel mixture of CNTs and V 2 O 5 under NH 3 atmosphere as well as the ageing process in air. Besides the morphological and structural characterizations revealed by TEM, SEAD, EDS, XRD and XPS measurements, typical electrochemical tests including cyclic voltammetry (CV), rotating disk electrode (RDE) and chronoamperometry have been employed to determine the oxygen reduction reaction (ORR) performance of VO x N y -CNTs. Inspiringly, the results indicate that VO x N y -CNTs catalyst exhibits a 0.4 mA/cm 2 larger diffusion-limited current density, a 0.10 V smaller onset potential value, a 10.73% less of ORR current decay and an excellent methanol-tolerance compared with commercial Pt/C catalyst. Therefore, we have reasonable grounds to believe that this new VO x N y -CNTs nanocomposites can be regarded as a promising non-precious methanol-tolerant ORR catalyst candidate for alkaline fuel cells.

Noble metal

10.1038/srep17385

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Citations (21)

Novel VN/C nanocomposites as methanol-tolerant oxygen reduction electrocatalyst in alkaline electrolyte

Scientific Reports (2015)

Kai Huang Ke Bi Ce Liang Sen Lin R. Zhang

Abstract A novel VN/C nanostructure consisting of VN nanoparticles and graphite-dominant carbon layers is synthesized by nitridation of V 2 O 5 using melamine as reductant under inert atmosphere. High crystalline VN nanoparticles are observed to be uniformly distributed in carbon layers with an average size of ca 13.45 nm. Moreover, the electrocatalytic performance of VN/C towards oxygen reduction reaction (ORR) in alkaline electrolyte is fascinating. The results show that VN/C has a considerable ORR activity, including a 75 percent value of the diffusion-limited current density and a 0.11 V smaller value about the onset potential with respect to Pt/C catalyst. Moreover, the excellent methanol-tolerance performance of VN/C has also been verified with 3 M methanol. Combined with the competitive prices, this VN/C nanocomposite can serve as an appropriate non-precious methanol-tolerant ORR catalyst for alkaline fuel cells.

10.1038/srep11351

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Citations (56)

Mid-infrared polarization-controlled broadband achromatic metadevice

Science Advances (2020)

Kai Ou Feilong Yu Guanhai Li Wenjuan Wang Andrey E. Miroshnichenko

Metasurfaces provide a compact, flexible, and efficient platform to manipulate the electromagnetic waves. However, chromatic aberration imposes severe restrictions on their applications in broadband polarization control. Here, we propose a broadband achromatic methodology to implement polarization-controlled multifunctional metadevices in mid-wavelength infrared with birefringent meta-atoms. We demonstrate the generation of polarization-controlled and achromatically on-axis focused optical vortex beams with diffraction-limited focal spots and switchable topological charge (L∥ = 0 and L⊥ = 2). Besides, we further implement broadband achromatic polarization beamsplitter with high polarization isolation (extinction ratio up to 21). The adoption of all-silicon configuration not only facilitates the integration with CMOS technology but also endows the polarization multiplexing meta-atoms with broad phase dispersion coverage, ensuring the large size and high performance of the metadevices. Compared with the state-of-the-art chromatic aberration-restricted polarization-controlled metadevices, our work represents a substantial advance and a step toward practical applications.

Achromatic lens

10.1126/sciadv.abc0711

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Citations (100)

Profound Climatic Effects on Two East Asian Black-Throated Tits (Ave: Aegithalidae), Revealed by Ecological Niche Models and Phylogeographic Analysis

PLoS ONE (2011)

Chuanyin Dai Na Zhao Wenjuan Wang Congtian Lin Bin Gao

Although a number of studies have assessed the effects of geological and climatic changes on species distributions in East Asian, we still have limited knowledge of how these changes have impacted avian species in south-western and southern China. Here, we aim to study paleo-climatic effects on an East Asian bird, two subspecies of black-throated tit (A. c. talifuensis–concinnus) with the combined analysis of phylogeography and Ecological Niche Models (ENMs). We sequenced three mitochondrial DNA markers from 32 populations (203 individuals) and used phylogenetic inferences to reconstruct the intra-specific relationships among haplotypes. Population genetic analyses were undertaken to gain insight into the demographic history of these populations. We used ENMs to predict the distribution of target species during three periods; last inter-glacial (LIG), last glacial maximum (LGM) and present. We found three highly supported, monophyletic MtDNA lineages and different historical demography among lineages in A. c. talifuensis–concinnus. These lineages formed a narrowly circumscribed intra-specific contact zone. The estimated times of lineage divergences were about 2.4 Ma and 0.32 Ma respectively. ENMs predictions were similar between present and LGM but substantially reduced during LIG. ENMs reconstructions and molecular dating suggest that Pleistocene climate changes had triggered and shaped the genetic structure of black-throated tit. Interestingly, in contrast to profound impacts of other glacial cycles, ENMs and phylogeographic analysis suggest that LGM had limited effect on these two subspecies. ENMs also suggest that Pleistocene climatic oscillations enabled the formation of the contact zone and thus support the refuge theory.

Last Glacial Maximum

Subspecies

Environmental niche modelling

Demographic history

Lineage (genetic)

10.1371/journal.pone.0029329

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Citations (54)

Graphite Carbon-Supported Mo2C Nanocomposites by a Single-Step Solid State Reaction for Electrochemical Oxygen Reduction

PLoS ONE (2015)

K. Huang Ke Bi Ce Liang Sen Lin Wenjuan Wang

Novel graphite-molybdenum carbide nanocomposites (G-Mo2C) are synthesized by a typical solid state reaction with melamine and MoO3 as precursors under inert atmosphere. The characterization results indicate that G-Mo2C composites are composed of high crystallization and purity of Mo2C and few layers of graphite carbon. Mo2C nanoparticles with sizes ranging from 5 to 50 nm are uniformly supported by surrounding graphite layers. It is believed that Mo atom resulting from the reduction of MoO3 is beneficial to the immobilization of graphite carbon. Moreover, the electrocatalytic performances of G-Mo2C for ORR in alkaline medium are investigated by cyclic voltammetry (CV), rotating disk electrode (RDE) and chronoamperometry test with 3M methanol. The results show that G-Mo2C has a considerable catalytic activity and superior methanol tolerance performance for the oxygen reduction reaction (ORR) benefiting from the chemical interaction between the carbide nanoparticles and graphite carbon.

Chronoamperometry

Carbon fibers

Inert gas

10.1371/journal.pone.0138330

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Citations (27)

A small secreted protein triggers a TLR2/4-dependent inflammatory response during invasive Candida albicans infection

Nature Communications (2019)

Wenjuan Wang Zihou Deng Hongyu Wu Qun Zhao Tiantian Li

Abstract Candida albicans can switch from commensal to pathogenic mode, causing mucosal or disseminated candidiasis. The host relies on pattern-recognition receptors including Toll-like receptors (TLRs) and C-type lectin receptors (CLRs) to sense invading fungal pathogens and launch immune defense mechanisms. However, the complex interplay between fungus and host innate immunity remains incompletely understood. Here we report that C . albicans upregulates expression of a small secreted cysteine-rich protein Sel1 upon encountering limited nitrogen and abundant serum. Sel1 activates NF-κB and MAPK signaling pathways, leading to expression of proinflammatory cytokines and chemokines. Comprehensive genetic and biochemical analyses reveal both TLR2 and TLR4 are required for the recognition of Sel1. Further, SEL1 -deficient C . albicans display an impaired immune response in vivo, causing increased morbidity and mortality in a bloodstream infection model. We identify a critical component in the Candida-host interaction that opens a new avenue to tackle Candida infection and inflammation.

Proinflammatory cytokine

10.1038/s41467-019-08950-3

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Citations (66)