Junxia Guo

Beijing University of Chemical Technology

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Guiping Ma

Beijing University of Chemical Technology

Jun Nie

Beijing University of Chemical Technology

Zhengbo Chen

Capital Normal University

Yuzhi Wang

Shanxi Agricultural University

Qijian Niu

Jiangsu University

Jinfeng Sun

Yanbian University

Cenjin Zhang

State Key Laboratory of Chemobiosensing and Chemometrics

Yigang Zhou

Shanghai Polytechnic University

Lihao Zuo

Hebei University of Science and Technology

Binling Chen

Beijing Institute of Technology

Cooperative Institutions

Chinese Academy of Sciences

Beijing University of Chemical Technology

Hebei University of Science and Technology

Shanghai Jiao Tong University

Shandong University

University of Chinese Academy of Sciences

Jiangsu University

University of Science and Technology of China

Central South University

Sichuan Academy of Traditional Chinese Medicine

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Flexible, Porous, and Metal–Heteroatom-Doped Carbon Nanofibers as Efficient ORR Electrocatalysts for Zn–Air Battery

Nano-Micro Letters (2019)

Qijian Niu Binling Chen Junxia Guo Jun Nie Xindong Guo

Developing an efficient and durable oxygen reduction electrocatalyst is critical for clean-energy technology, such as fuel cells and metal–air batteries. In this study, we developed a facile strategy for the preparation of flexible, porous, and well-dispersed metal–heteroatom-doped carbon nanofibers by direct carbonization of electrospun Zn/Co-ZIFs/PAN nanofibers (Zn/Co-ZIFs/PAN). The obtained Zn/Co and N co-doped porous carbon nanofibers carbonized at 800 °C (Zn/Co–N@PCNFs-800) presented a good flexibility, a continuous porous structure, and a superior oxygen reduction reaction (ORR) catalytic activity to that of commercial 20 wt% Pt/C, in terms of its onset potential (0.98 V vs. RHE), half-wave potential (0.89 V vs. RHE), and limiting current density (− 5.26 mA cm−2). In addition, we tested the suitability and durability of Zn/Co–N@PCNFs-800 as the oxygen cathode for a rechargeable Zn–air battery. The prepared Zn–air batteries exhibited a higher power density (83.5 mW cm−2), a higher specific capacity (640.3 mAh g−1), an excellent reversibility, and a better cycling life than the commercial 20 wt% Pt/C + RuO2 catalysts. This design strategy of flexible porous non-precious metal-doped ORR electrocatalysts obtained from electrospun ZIFs/polymer nanofibers could be extended to fabricate other novel, stable, and easy-to-use multi-functional electrocatalysts for clean-energy technology.

Heteroatom

Electrospinning

Carbon fibers

10.1007/s40820-019-0238-4

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Citations (98)

An electrochemical aptasensor based on the amplification of two kinds of gold nanocrystals for the assay of L-histidine with picomolar detection limit

Nanotechnology (2013)

Zhengbo Chen Junxia Guo Jing Li Lin Guo

Au nanocrystals (NCs) enclosed by higher-index facets have high surface chemical activity. They attract much attention because of their excellent biocompatibility. In this work, well-defined elongated tetrahexahedral (ETHH) Au NCs and end-truncated ETHH with high-index facets are successfully prepared by using a single surfactant system of didodecyldimethylammonium bromide (DDAB) and a binary system of cetyltrimethylammoniumbromide and DDAB in two-step seed-mediated growth. The characteristics of high-index facet Au NC modified electronic aptamer-based sensors are presented and they are applicable to a wide range of aptamers. Herein, we only take L-histidine as the representative sensing target. With modification of the Au NCs, a very low detection limit (sub-picomolar) is obtained. In particular, a detailed sensitivity comparison between the modification of end-truncated ETHH and ETHH Au NCs is presented to demonstrate the slight difference in the chemical activities of Au NCs with different high-index facets. Our work sheds light on the large scale fabrication of Au/metallic NCs with high-index facets and also provides a new eye-opening example of engineering ultra-sensitive DNA sensors based on Au NCs.

Aptamer

Biocompatibility

10.1088/0957-4484/24/29/295501

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Citations (7)

Thermosensitive molecularly imprinted hydrogel cross‐linked with N‐malely chitosan for the recognition and separation of BSA

Journal of Separation Science (2013)

Cenjin Zhang Xiaoping Jia Yuzhi Wang Min Zhang Shan Yang

A novel temperature-sensitive molecularly imprinted hydrogel composed of N-isopropylacrylamide and acrylamide has been prepared by using free-radical polymerization and was cross-linked by modified water-soluble N-maley chitosan in aqueous solution. BSA (pI 4.9, MW 66.0 kDa) was used as the template protein. The produced hydrogels were characterized by environmental SEM to reveal the microcosmic morphology. A microporous structure was only found in the imprinted hydrogel, while no obvious microporous structure was found in nonimprinted hydrogels. The lower critical solution temperature of the hydrogels was 34°C, and the optimal binding conditions were tested, namely, the adsorption equilibrium time of 6 h and initial BSA concentration of 1.0 mg/mL. The adsorption capacity Qmax was determined by Langmuir isotherm plots and was 5.72 mg/g for imprinted hydrogel and 1.18 mg/g for nonimprinted hydrogels. A separation factor (β) of 4 was obtained when bovine hemoglobin (pI 6.9, MW 64.0 kDa) was selected as the particular reference protein. Molecular weights and pIs were chosen to investigate the selectivity of the hydrogels. It was shown that the shape memory and the size effect were the major factors for the recognition. This imprinted hydrogel was used to specifically adsorb the BSA from the protein mixture.

Langmuir adsorption model

Molecular imprinting

Selective adsorption

10.1002/jssc.201301155

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Citations (30)

Nucleation and growth of amorphous carbon film on tungsten-implanted stainless steel substrates

Diamond and Related Materials (2006)

Ming Xu Liuhe Li Xun Cai Youming Liu Qiulong Chen

Amorphous carbon

Carbon fibers

Carbon steel

10.1016/j.diamond.2005.12.053

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Citations (10)

A Rapid Method to Determine the Total Proteins in Serum Sample Studied by Synchronous Fluorescence Technique with N-(pentyl)-N′-(sodium p-aminobenzenesulfonate) thiourea as Probe

Journal of Henan Normal University (2011)

Junxia Guo

The experiment is investigated for the three-dimensional spectra of N-(pentyl)-N′-(sodium p-aminobenzenesulfonate)thiourea(APT)-human serum albumin(HSA) system.The results show that APT can react with HSA,and the conformational and micro-environmental changes of HSA are investigated by comparing the three-dimensional spectral changes.The effect factors for spectral characterization and intensity of synchronous fluorescence such as the value of Δλ,pH,ionic strength,addition sequence,reagent concentration are investigated.Under the optimum conditions,the synchronous fluorescence intensity of the system is in proportion to the concentration of protein in the range of 2.0~479.0 mg·L-1 for human serum albumin(HSA),with the detection limit 1.3 mg·L-1 for HSA.The linear correlation coefficient is 0.998.It is used to determine protein in human serum sample,the recovery is within the range of 102.8%~104.6%.

Human serum albumin

Serum Albumin

Source

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Profiling complex volatile components by HS-GC-MS and entropy minimization software: An example on Ligusticum chuanxiong Hort.

Journal of Pharmaceutical and Biomedical Analysis (2022)

Yina Tang Qingmiao Li Yuan Chongjun Shuai Chen Sen Luo

10.1016/j.jpba.2022.114854

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Citations (4)

Electrospun core–shell nanofibers derived Fe–S/N doped carbon material for oxygen reduction reaction

Applied Surface Science (2017)

Junxia Guo Qijian Niu Yichun Yuan Inamullh Maitlo Jun Nie

Polyacrylonitrile

Electrospinning

Nanomaterials

10.1016/j.apsusc.2017.04.135

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Citations (44)

Multicomponent Doped Sugar-Coated Haws Stick-like Nanofibers as Efficient Oxygen Reduction Reaction Catalysts for the Zn–Air Battery

ACS Sustainable Chemistry & Engineering (2019)

Jie Di Junxia Guo Nannan Wang Guiping Ma

In this work, unique sugar-coated haws stick-like core–shell ZIF-67@PAN-HCCP-MIM-FeCl3 nanofibers were successfully prepared by electrospinning and an in situ nanocrystal growth process. After carbonization of the as-synthesized nanofibers at various temperatures, the resulting sample Fe/Co-N/P-9 (carbonized at 900 °C) retained the presented a sugar-coated haws stick-like structure. The internal carbon nanofiber acts like a "stick" as a support, the "haws" composed of Co2P and Fe5C2 nanoparticles act as catalytic active sites, and the graphite carbon acts as "sugar" to protect particles from detachment. The channel gap between inner core and outer layer can improve the mass transfer process. Owing to these special structure and unique composition features, Fe/Co-N/P-9 exhibited excellent oxygen reduction reaction (ORR) performance with an onset potential of 0.96 V (vs RHE) and a half wave potential of 0.85 V (vs RHE) in 0.1 M KOH solution. Fe/Co-N/P-9 also showed good catalytic stability and methanol tolerance. In addition, the rechargeable Zn–air battery fabricated by Fe/Co-N/P-9 exhibited a galvanostatic discharge voltage of 1.25 V, a higher specific capacity of 565 mAh/gZn, and a better cycle stability than Pt/C+RuO2.

10.1021/acssuschemeng.8b06447

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Citations (38)

Chitosan nanoparticle carrier based on surface molecularly imprinted polymers for the recognition and separation of proteins

RSC Advances (2015)

Cenjin Zhang Yuzhi Wang Junxia Guo Yanjin Liu Yigang Zhou

This paper discusses the construction of surface molecularly imprinted polymers (MIPs) based on modified chitosan (CS) nanoparticle carriers to recognize and separate bovine serum albumin (BSA, pI 4.9, MW 69.0 kDa) in aqueous solution.

Molecularly imprinted polymer

Bovine serum albumin

Molecular imprinting

Surface Modification

10.1039/c5ra14088a

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Citations (12)

Magnetic-graphene based molecularly imprinted polymer nanocomposite for the recognition of bovine hemoglobin

Talanta (2015)

Junxia Guo Yuzhi Wang Yanjin Liu Cenjin Zhang Yigang Zhou

Molecularly imprinted polymer

Molecular imprinting

Nanomaterials

In situ polymerization

10.1016/j.talanta.2015.06.057

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Citations (51)