|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Fe atoms anchored on defective nitrogen doped hollow carbon spheres as efficient electrocatalysts for oxygen reduction reaction显示文摘Defective electrocatalysts,especially for intrinsic defective carbon,have aroused a wide concern owing to high spin and charge densities.However,the designated nitrogen species favorable for creating defects by the removal of nitrogen,and the influence of defects for the coordination structure of active site and oxygen reduction reaction(ORR)activity have not been elucidated.Herein,we designed and synthesized a pair of electrocatalysts,denoted as Fe-N/C and Fe-ND/C for coordination sites of atomic iron-nitrogen and iron-nitrogen/defect configuration embedded in hollow carbon spheres,respectively,through direct pyrolysis of their corresponding hollow carbon spheres adsorbed with Fe(acac)3.The nitrogen defects were fabricated via the evaporation of pyrrolic-N on nitrogen doped hollow carbon spheres.Results of comparative experiments between Fe-N/C and Fe-ND/C reveal that Fe-ND/C shows superior ORR activity with an onset potential of 30 mV higher than that of Fe-N/C.Fe-ND sites are more favorable for the enhancement of ORR activity.Density functional theory(DFT)calculation demonstrates that Fe-ND/C with proposed coordination structure of FeN_(4-x)(0 | Panpan Su Wenjuan Huang Jiangwei Zhang Utsab Guharoy Qinggang Du Qiao Sun Qike Jiang Yi Cheng Jie Yang Xiaoli Zhang Yongsheng Liu San Ping Jiang Jian Liu | 2021 | Nano Research2021，14，4： | 2 |
| 2 | Abrin induce oxidative stress mediated DNA damage in human leukemic cells and its reversal by N-acetylcysteine显示文摘 | Utsab Deb Om Kumar PV Lakshmana Rao | 2008 | Toxical In Vitro2008，22，8： | 1 |
| 3 | Designing of mouse model: A new approach for studying sulphur mustard-induced skin lesions显示文摘 | Vinay Lomash Utsab Deb Renuka Rai Sunil E. Jadhav R. Vijayaraghavan S.C. Pant | 2010 | Burns2010，，5： | 1 |
| 4 | Experimental mapping of short-wavelength phonons in proteins显示文摘Phonons are quasi-particles,observed as lattice vibrations in periodic materials,that often dampen in the presence of structural perturbations.Nevertheless,phonon-like collective excitations exist in highly complex systems,such as proteins,although the origin of such collective motions has remained elusive.Here we present a picture of temperature and hydration dependence of collective excitations in green fluorescent protein(GFP)obtained by inelastic neutron scattering.Our results provide evidence that such excitations can be used as a measure of flexibility/softness and are possibly associated with the protein’s activity.Moreover,we show that the hydration water in GFP interferes with the phonon propagation pathway,enhancing the structural rigidity and stability of GFP. | Utsab R.Shrestha Eugene Mamontov Hugh M.O’Neill Qiu Zhang Alexander I.Kolesnikov Xiangqiang Chu | 2022 | The Innovation2022，3，1： | 1 |
| 5 | Edge-enriched N, S co-doped hierarchical porous carbon for oxygen reduction reaction显示文摘The development of carbon materials with high electrochemical performance for next-generation energy device is emerging, especially N, S co-doped carbon materials have sparked intensive attention. However,the exploration of N, S co-doped carbon with well-defined active sites and hierarchical porous structures are still limited. In this study, we prepared a series of edge-enriched N, S co-doped carbon materials through pyrolysis of thiourea(TU) encapsulated in zeolitic imidazolate frameworks(TU@ZIF) composites,which delivered very good oxygen reduction reaction(ORR) performance in alkaline medium with onset potential of 0.94 V vs. reversible hydrogen electrode(RHE), good stability and methanol tolerance. Density functional theory(DFT) calculations suggested that carbon atoms adjacent to N and S are probable active sites for ORR intermediates in edge-enriched N, S co-doped carbon materials because higher electron density can enhance O_(2)adsorption, lower formation barriers of intermediates, improving the ORR performance comparing to intact N, S co-doped carbon materials. This study might provide a new pathway for improving ORR activity by the integration engineering of edge sites, and electronic structure of heteroatom doped carbon electrocatalysts. | Fangfang Chang Panpan Su Utsab Guharoy Runping Ye Yanfu Ma Huajun Zheng Yi Jia Jian Liu | 2023 | Chinese Chemical Letters2023，34，2： | 0 |
| 6 | 那一种非常有趣的生活方式显示文摘摄养蜜蜂的人有着独特的生活方式,他们需要依照季节追寻鲜花而远行。北国冰封的时候,他们就去鲜花盛开的南国。而当北方的槐树、荆条以及椴树开花的时候,他们又回到了北方。鲜花开放的田野,是他们的作业场所。他们带着一箱一箱的蜜蜂,带着帐篷,像传说中的吉卜赛人一样游走远方。 | (益加拉国)Utsab Ahamed Akash(摄影) 薛百成 | 2022 | 记者摇篮2022，，9： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员