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UID:DSC-14920
DTSTART;TZID=Europe/Berlin:20180828T130000
SEQUENCE:1535414767
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URL:https://www.dresden-science-calendar.de/calendar/de/detail/14920
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Qu: Hydrogen evolution reaction (HER) based-on MoS2 and rolled-up n
 anomembranes
CLASS:PUBLIC
DESCRIPTION:Speaker: Jiang Qu\nInstitute of Speaker: IFW Dresden\nTopics:\n
 Materialien\, Physik\n Location:\n  Name: IFW (B3E.26\, IFW Dresden)\n  St
 reet: Helmholtzstraße 20\n  City: 01069 Dresden\n  Phone: \n  Fax: \nDesc
 ription: Electrocatalysts play a key role in energy conversion technologie
 s towards sustainable\, fossil-free pathways to produce fuels and chemical
 s of global importance\, because they can increase the reaction rate\, eff
 iciency\, and selectivity of the chemical transformations involved.[1] One
  prospective goal is to develop electrochemical conversion processes that 
 can convert water (H2O) in the atmosphere into higher-value products (H2).
  Active catalysts are required to minimize the overpotential which is nece
 ssary to drive the hydrogen evolution reaction (HER\; 2H+ + 2e- -> H2)[2-3
 ]. MoS2\, a star 2D material\, has been proved its promising application i
 n HER and once it was the most active non-precious metal HER catalyst.[4-5
 ] A geometric area-normalized current density of 10 mA.cm-2 has been achie
 ved at from 150 to 200 mV overpotential by doping\, strain-vacancy\, and p
 hase transition.[6-8] In order to further improve HER based on MoS2\, hete
 ro-material systems\, e.g. MoS2/MoP\, have drawn much attention due to the
 ir higher HER performance. However\, to date the results of MoS2/MoP syste
 ms from chemists and material scientists are confused by a puzzle\, i.e.\,
  which form of the material leads to the excellent HER performance\, MoS2(
 1-x)Px compounds or MoS2@MoP heterojunctions?[9-11] Therefore\, it is of v
 ital importance to develop on-chip micro chemical reactors to reveal the f
 undamental nanoscale mechanisms of 2D materials in HER. Furthermore\, such
  prototype of on-chip HER setup will provide an efficient platform for dev
 eloping microengine based on HER. In this seminar\, I will introduce my re
 search progress on on-chip HER. An integrated micro chemical reactor platf
 orm has been built up and a series of devices with different structure (Mo
 S2(1-x)Px compounds or MoS2@MoP heterojunctions) have been fabricated. By 
 smartly combining microfabrication and chemical process\, the puzzle of Mo
 S2/MoP material in HER field was disentangled. The geometric area-normaliz
 ed current density of 10mA.cm-2 with an overpotential of 40 mV\, a world l
 eading value for all non-precious metal catalysts\, has been achieved in a
  micro reactor of HER which was treated with O2 plasma and phosphorization
 . It is proved that the excellent HER performance of MoS2/MoP is ascribed 
 to the structure of MoS2(1-x)Px compounds. Moreover\, by integrating with 
 rolled-up metal nanomembranes\,[12] the vacancies in 2D materials which ar
 e critical for HER can be tuned by the curling of 2D materials in rolled-u
 p microtubes. The investigation of HER with 2D materials in integrated tub
 ular reactors and the exploration of applying 2D materials in microengines
  will be performed during the next steps of works.  References [1] Seh et 
 al.\, Science\, 355\, 4998–5009 (2017). [2] Y. Jiao\, et al. Chem. Soc. 
 Rev. 44\, 2060–2086 (2015). [3] J. D. Benck\, et al ACS Catal. 4\, 3957
 –3971 (2014). [4] G. Li\, et al. J. Am. Chem. Soc. 138\, 16632–16638 (
 2016). [5] H. Jin\, et al. Chem. Rev.\, 118 (13)\, pp 6337–6408 (2018). 
 [6] J. Deng\, et al. Energy Environ. Sci.\, 8\, 1594 (2015). [7] H. Li\, e
 t al. Nature Materials\, 15\, 48–53 (2016). [8] Y. Yu\, et al. Nature Ch
 emistry 10\, 638–643(2018). [9] J Kibsgaard\, et al. Angew. Chem. Int. E
 d. 53\, 14433–14437 (2014). [10] R. Ye\, et al. Adv. Mater. 28\, 1427–
 1432 (2016). [11] A. Wu\, et al. Nanoscale\, 8\, 11052-11059 (2016). [12] 
 Mei\, Y. \, Huang\, G. \, Solovev\, A. A.\, Ureña\, E. B.\, Mönch\, I. \
 , Ding\, F. \, Reindl\, T.\, Fu\, R. K.\, Chu\, P. K. and Schmidt\, O. G. 
 Adv. Mater.\, 2008\, 20: 4085-4090.
DTSTAMP:20260427T233620Z
CREATED:20180828T000607Z
LAST-MODIFIED:20180828T000607Z
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