Abstract:
:The metal-free nitrogen-doped graphitic-carbon@graphene (Ng-C@G) is prepared from a composite of polyaniline and graphene by a facile polymerization following by pyrolysis for electrochemical oxygen reduction reaction (ORR). Pyrolysis creates a sponge-like with ant-cave-architecture in the polyaniline derived nitrogenous graphitic-carbon on graphene. The nitrogenous carbon is highly graphitized and most of the nitrogen atoms are in graphitic and pyridinic forms with less oxygenated is found when pyrolyzed at 800 °C. The electrocatalytic activity of Ng-C@G-800 is even better than the benchmarked Pt/C catalyst resulting in the higher half-wave potential (8 mV) and limiting current density (0.74 mA cm-2) for ORR in alkaline medium. Higher catalytic performance is originated from the special porous structure at microscale level and the abundant graphitic- and pyridinic-N active sites at the nanoscale level on carbon-graphene matrix which are beneficial to the high O2-mass transportation to those accessible sites. Also, it possesses a higher cycle stability resulting in the negligible potential shift and slight oxidation of pyridinic-N with better tolerance to the methanol.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Begum H,Ahmed MS,Kim YBdoi
10.1038/s41598-020-68260-3subject
Has Abstractpub_date
2020-07-24 00:00:00pages
12431issue
1issn
2045-2322pii
10.1038/s41598-020-68260-3journal_volume
10pub_type
杂志文章abstract::CD31hiEmcnhi vessels were a subtype of vessels in the murine skeletal system, with high levels of platelet and endothelial cell adhesion molecule-1 (PECAM-1/CD31) and endomucin (Emcn). They were reported coupling angiogenesis and osteogenesis during bone development. We investigated the distribution of these vessels i...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-017-04150-5
更新日期:2017-07-10 00:00:00
abstract::Fuel substrate supply and oxidative phosphorylation are key determinants of muscle performance. Numerous studies of mammalian mitochondria are carried out (i) with substrate supply that limits electron flow, and (ii) far below physiological temperature. To analyze potentially implicated biases, we studied mitochondria...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-017-02789-8
更新日期:2017-06-06 00:00:00
abstract::Colloidal quantum dots (QDs) are an emerging class of new materials due to their unique physical properties. In particular, colloidal QD based light emitting diodes (QDLEDs) have been extensively studied and developed for the next generation displays and solid-state lighting. Among a number of approaches to improve pe...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep08968
更新日期:2015-03-10 00:00:00
abstract::We evaluated bioactive glass graft (S53P4) in patients undergoing Le Fort I osteotomy, with non-grafted patients as controls. Computed tomography facial scans of the 25 patients submitted for Le Fort I were divided into two groups: Group 1-S53P4 group and Group 2-without grafting. CT scans were analyzed in the immedia...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-68932-0
更新日期:2020-07-29 00:00:00
abstract::A new concept in the formulation of hybrid nanostructured materials combining high quality graphene 3D supported by Nickel foam and polyporphyrins for visible light photocatalytic application is here reported. Our innovative approach involves the development of a freestanding device able to: i) offer a high surface ar...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-018-23345-y
更新日期:2018-03-22 00:00:00
abstract::This study was to assess the safety and efficacy of artificial ascitetes in assisting CT-guided cryoablation of hepatic tumors adjacent to the gastrointestinal (GI) tract. A total of 84 patients with peripheral hepatic tumors adjacent to the GI tract, who were treated cryoablation, were included in this retrospective ...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-017-17023-8
更新日期:2017-11-30 00:00:00
abstract::Aconiti Lateralis Radix Praeparata (Fuzi) and Fritillariae Thunbergii bulbus (Beimu) have been widely used clinically to treat cardiopulmonary related diseases in China. However, according to the classic rules of traditional Chinese medicine, Fuzi and Beimu should be prohibited to use as a combination for their incomp...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep34903
更新日期:2016-10-14 00:00:00
abstract::Buccal mucosa squamous cell carcinoma (BMSCC) is one of major subsites of oral cancer and is associated with a high rate of metastasis and poor prognosis. Heat shock proteins (HSPs) act as potential prognostic biomarkers in many cancer types. However, the role of HSPD1 in oral cancer, especially in BMSCC, is still unk...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-019-45489-1
更新日期:2019-06-20 00:00:00
abstract::Reproductive investment generally involves a trade-off between somatic growth and energy allocation for reproduction. Previous studies have inferred that jumbo squid Dosidicus gigas support growth during maturation through continuous feeding (an "income" source). However, our recent work suggests possible remobilizati...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-66703-5
更新日期:2020-06-15 00:00:00
abstract::Indoleamine 2,3 dioxygenase-1 (IDO-1) is an enzyme in the kynurenine pathway which augments tumor-induced immune tolerance. Previous studies in childhood acute myeloid leukemia (AML) have shown a negative correlation of IDO-1 mRNA expression with outcomes. The aim of our study was to develop a practical and objective ...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-017-12940-0
更新日期:2017-10-16 00:00:00
abstract::Abiotic synthesis of biomolecules is an essential step for the chemical origin of life. Many attempts have succeeded in synthesizing biomolecules, including amino acids and nucleobases (e.g., via spark discharge, impact shock, and hydrothermal heating), from reduced compounds that may have been limited in their availa...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-66112-8
更新日期:2020-06-08 00:00:00
abstract::The optimal approach for continuous measurement of intraocular pressure (IOP), including pressure transducer location and measurement frequency, is currently unknown. This study assessed the capability of extraocular (EO) and intraocular (IO) pressure transducers, using different IOP sampling rates and duty cycles, to...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-77880-8
更新日期:2020-12-01 00:00:00
abstract::Phytoplankton play key roles in the oceans by regulating global biogeochemical cycles and production in marine food webs. Global warming is thought to affect phytoplankton production both directly, by impacting their photosynthetic metabolism, and indirectly by modifying the physical environment in which they grow. In...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-59989-y
更新日期:2020-02-25 00:00:00
abstract::The ability of human metaphase-II arrested eggs to activate following fertilisation declines with advancing maternal age. Egg activation is triggered by repetitive increases in intracellular Ca(2+) concentration ([Ca(2+)]i) in the ooplasm as a result of sperm-egg fusion. We therefore hypothesised that eggs from older ...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep19357
更新日期:2016-01-20 00:00:00
abstract::In this work, a novel technique to create positive-negative tunable liquid crystal lenses is proposed and experimentally demonstrated. This structure is based on two main elements, a transmission line acting as a voltage divider and concentric electrodes that distribute the voltage homogeneously across the active area...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-67141-z
更新日期:2020-06-23 00:00:00
abstract::Nitric oxide synthase like enzyme (NOS-like enzyme), which produces nitric oxide, participates in many biological processes. However it remains unidentified and highly controversial that plants do possess a NOS-like enzyme. In this paper, a novel arginine analogue NP1 was designed and developed for the direct identifi...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep32630
更新日期:2016-09-02 00:00:00
abstract::Traumatic brain injury (TBI) causes brain edema that induces increased intracranial pressure and decreased cerebral perfusion. Decompressive craniectomy has been recommended as a surgical procedure for the management of swollen brain and intracranial hypertension. Proper location and size of a decompressive craniectom...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-75479-7
更新日期:2020-10-29 00:00:00
abstract::It is now well established that at a superconductor/ferromagnet (S/F) interface an unconventional superconducting state arises in which the pairing is odd-frequency. The hallmark signature of this superconducting state is generally understood to be an enhancement of the electronic density of states (DoS) at subgap ene...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep15483
更新日期:2015-10-27 00:00:00
abstract::Bradysia odoriphaga and Bradysia difformis are devastating pests of vegetable, ornamental crops and edible mushrooms causing significant losses. Temperature may be an important factor restricting their population abundance in the summer. To determine the effects of short-term heat shock on adults, their survival, long...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-017-13560-4
更新日期:2017-10-17 00:00:00
abstract::Conduction Electron Paramagnetic Resonance Imaging (CEPRI) is presented as a sensitive technique for mapping metallic lithium species. The method is demonstrated using different samples that are either thick or thin compared to the microwave skin depth. As a thin sample, microstructured metallic lithium deposits in a ...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-018-32112-y
更新日期:2018-09-25 00:00:00
abstract::The potential of Massively Parallel Sequencing (MPS) technology to vastly expand the capabilities of human identification led to the emergence of different MPS platforms that use forensically relevant genetic markers. Two of the MPS platforms that are currently available are the MiSeq® FGx™ Forensic Genomics System (I...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-017-00510-3
更新日期:2017-03-24 00:00:00
abstract::Vapor condensation is routinely used as an effective means of transferring heat or separating fluids. Dropwise condensation, where discrete droplets form on the condenser surface, offers a potential improvement in heat transfer of up to an order of magnitude compared to filmwise condensation, where a liquid film cover...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-017-18955-x
更新日期:2018-01-11 00:00:00
abstract::Periconceptional supplementation with folic acid reduces the occurrence of neural tube defects (NTDs). The association between maternal abnormalities in homocysteine metabolism (e.g., hyperhomocysteinaemia, folate deficiency and low vitamin B12) and the risk of NTDs-affected pregnancies has been widely evaluated in re...
journal_title:Scientific reports
pub_type: 杂志文章,meta分析
doi:10.1038/srep08510
更新日期:2015-03-02 00:00:00
abstract::Image enhancement techniques are able to improve the contrast and visual quality of magnetic resonance (MR) images. However, conventional methods cannot make up some deficiencies encountered by respective brain tumor MR imaging modes. In this paper, we propose an adaptive intuitionistic fuzzy sets-based scheme, called...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep35760
更新日期:2016-10-27 00:00:00
abstract::Clogging of porous media by soft particles has become a subject of extensive research in the last years and the understanding of the clogging mechanisms is of great importance for process optimization. The rise in the utilization of microfluidic devices brought the possibility to simulate membrane filtration and perfo...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-019-45791-y
更新日期:2019-06-25 00:00:00
abstract::In this paper, we present a strategy to improve delivery of femtosecond laser pulses from a regenerative amplifier through a hollow core photonic crystal fiber for temporally focused wide-field two-photon endomicroscopy. For endomicroscope application, wide-field two-photon excitation has the advantage of requiring no...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep06626
更新日期:2014-10-15 00:00:00
abstract::Numerous essential metal elements (EMEs) are necessary to maintain the proper function of human body. In this case-control study, we investigated the associations of 11 EMEs [Calcium (Ca), potassium (K), magnesium (Mg), sodium (Na), manganese (Mn), selenium (Se), cobalt (Co), Molybdenum (Mo), copper (Cu), zinc (Zn), a...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-66496-7
更新日期:2020-07-03 00:00:00
abstract::The interaction between active element Zr and W damages the W fibers and the interface and decreases the mechanical properties, especially the tensile strength of the W fibers reinforced Zr-based bulk metallic glass composites (BMGCs). From the viewpoint of atomic interaction, the W-Zr interaction can be restrained by...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep08967
更新日期:2015-03-11 00:00:00
abstract::β-Glucosidases are enzymes that hydrolyze β-glycosidic bonds to release non-reducing terminal glucosyl residues from glycosides and oligosaccharides, and thus have significant application potential in industries. However, most β-glucosidases are feedback inhibited by the glucose product, which restricts their applicat...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/srep17296
更新日期:2015-11-25 00:00:00
abstract::Gallbladder cancer (GBC) is a highly malignant tumor with poorly understood etiology. An insight into phenotypic features of this malignancy may add to the knowledge of its carcinogenesis and pave the way to new therapeutic approaches. We assessed the expression of female sex hormone receptors (ERα, ERβ, PR), connecti...
journal_title:Scientific reports
pub_type: 杂志文章
doi:10.1038/s41598-020-58777-y
更新日期:2020-02-05 00:00:00