Directing the selectivity of CO2 electroreduction to target C2 products via non-metal doping on Cu surfaces

2021 ◽  
Author(s):  
Xing Zhi ◽  
Yan Jiao ◽  
Yao Zheng ◽  
Kenneth Davey ◽  
Shi-Zhang Qiao
Keyword(s):  
Oxygen Affinity ◽  
Product Selectivity ◽  
Metal Doping ◽  
Co2 Electroreduction ◽  
Metal Doped ◽  
Late Stages

Understanding the late stages of C2 pathways provides great opportunities for fully achieving a selective CO2 electroreduction. The C2 product selectivity can be directed by the active site's oxygen affinity on a range of non-metal doped Cu surfaces.

scholarly journals Zn-Doped Cu(100) facet with efficient catalytic ability for the CO2 electroreduction to ethylene

2019 ◽  
Vol 21 (38) ◽  
pp. 21341-21348 ◽  
Author(s):  
Yuefeng Zhang ◽  
Yong Zhao ◽  
Caiyun Wang ◽  
Zengxi Wei ◽  
Junliang Yang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Formation Mechanism ◽  
Theoretical Calculations ◽  
Co2 Electroreduction ◽  
Metal Doped

Theoretical calculations demonstrate that Zn-doped Cu(100) facet possesses efficient catalytic ability for the CO2-to-C2H4 conversion. This work provides deep insights into the formation mechanism of C2H4 on transition metal doped Cu surface.

Transition (Mn, Fe) and rare earth (La, Pr) metal doped ceria solid solutions for high performance photocatalysis: Effect of metal doping on catalytic activity

2017 ◽  
Vol 44 (4) ◽  
pp. 2523-2543 ◽  
Author(s):  
Perala Venkataswamy ◽  
Deshetti Jampaiah ◽  
Ahmad Esmaielzadeh Kandjani ◽  
Ylias M. Sabri ◽  
Benjaram M. Reddy ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rare Earth ◽  
Solid Solutions ◽  
High Performance ◽  
Doped Ceria ◽  
Metal Doping ◽  
Ceria Solid Solutions ◽  
Metal Doped ◽  
Rare Earth La

IMPROVEMENT OF PHOTOCATALYTIC ACTIVITY OF TiO2 VIA COMBINED ROUTE OF METAL DOPING AND SURFACE ACIDIFICATION

2006 ◽  
Vol 13 (04) ◽  
pp. 429-438 ◽  
Author(s):  
YONG LUAN ◽  
PINGFENG FU ◽  
XUEGANG DAI
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Emission Spectra ◽  
Favorable Effect ◽  
Infrared Analysis ◽  
X Ray Diffraction ◽  
Metal Doping ◽  
Ultraviolet Light Irradiation ◽  
Photocatalytic Activities ◽  
Metal Doped

In the present work, a combined route involving first doping of iron or neodymium ions via sol–gel method followed by acidification of the metal-doped TiO 2 particles for the improvement of the photocatalytic capability of TiO 2 was reported. The obtained metal-doped/acidified TiO 2 photocatalysts were thoroughly characterized by X-ray diffraction, Fourier transform infrared analysis, and photoluminescence emission spectra. At the same time, their photocatalytic activities were evaluated in simulant photodegradation of methylene blue (MB). The results based on these characterizations showed that not only a rutile layer formed on the surface of original TiO 2 particles after surface cladding, but also the doped Fe or Nd ion had a favorable effect on suppression of the electron–hole recombination in the titania under ultraviolet light irradiation. Furthermore, the photocatalytic activity of the material obtained by Fe doping and acidification was substantially improved in comparison to the untreated TiO 2. However, the sample prepared from Nd -doping and acidification of TiO 2 showed decreased capability relative to the untreated TiO 2 in degradation of MB under similar conditions. Finally, the reason why the photocatalytic activities of the obtained catalysts are sensitive to the metal-doping was discussed in details.

Tunable optical absorption of WS2 monolayer via alkali metal modulation

2020 ◽  
Vol 34 (10) ◽  
pp. 2050089 ◽  
Author(s):  
Pengfei Wu ◽  
Zhen Cui ◽  
Xinmei Wang ◽  
Yingchun Ding
Keyword(s):  
Optical Absorption ◽  
Alkali Metal ◽  
Density Functional ◽  
Metal Doping ◽  
Functional Theory ◽  
Charge Density Difference ◽  
Semiconductor Behavior ◽  
Metal Doped ◽  
Ws2 Monolayer ◽  
Large Charge

The electronic and optical absorption behaviors of alkali-metal atoms doped WS2 monolayer were systematically investigated by employing density functional theory based on first-principles calculations. The observed all alkali-metal-doped WS2 monolayer present metal behaviors, whereas the intrinsic WS2 monolayer exhibits semiconductor behavior. Charge density difference demonstrates that the large charge transfer occurs between the alkali metal and WS2 layer. The work function of WS2 can be adjusted from 5.12 eV to 5.52 eV. Importantly, the absorption spectrums of alkali-metal-doped WS2 appear with some absorption peaks at the 405 nm, 512 nm and 575 nm in the visible light range, which demonstrate the alkali-metal-doped WS2 can be used for photovoltaic and visible photocatalytic devices. Furthermore, the absorption spectrum of WS2 is generally redshifted through alkali metal doping. This indicates that alkali metal doping can broaden its application in optoelectronic devices.

scholarly journals Challenges in Determining the Location of Dopants, to Study the Influence of Metal Doping on the Photocatalytic Activities of ZnO Nanopowders

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 481 ◽  
Author(s):  
Takuya Tsuzuki ◽  
Rongliang He ◽  
Aaron Dodd ◽  
Martin Saunders
Keyword(s):  
Analytical Techniques ◽  
Data Interpretation ◽  
Metal Doping ◽  
Doping Effects ◽  
Photocatalytic Activities ◽  
Impurity Doping ◽  
Semiconductor Nanomaterials ◽  
Metal Doped

Impurity doping is one of the common approaches to enhance the photoactivity of semiconductor nanomaterials by increasing photon-capture efficiency in the visible light range. However, many studies on the doping effects have produced inconclusive and conflicting results. There are some misleading assumptions and errors that are frequently made in the data interpretation, which can lead to inconsistent results about the doping effects on photocatalysis. One of them is the determination of the location of dopants. Even using advanced analytical techniques, it is still challenging to distinguish between bulk modification and surface modification. The paper provides a case study of transition-metal-doped ZnO nanoparticles, whereby demonstrating common pitfalls in the interpretation of the results of widely-used analytical methods in detail, and discussing the importance of using a combination of many characterization techniques to correctly determine the location of added impurities, for elucidating the influence of metal doping on the photocatalytic activities of semiconductor nanoparticles.

Transition metal doping: a new and effective approach for remarkably high nonlinear optical response in aluminum nitride nanocages

2018 ◽  
Vol 42 (9) ◽  
pp. 6976-6989 ◽  
Author(s):  
Yasir Arshad ◽  
Saima Khan ◽  
Muhammad Ali Hashmi ◽  
Khurshid Ayub
Keyword(s):  
Transition Metal ◽  
Alkali Metal ◽  
Aluminum Nitride ◽  
Nonlinear Optical ◽  
Nonlinear Optical Response ◽  
Transition Metal Doping ◽  
Metal Doping ◽  
Early Transition Metal ◽  
Nlo Response ◽  
Metal Doped

NLO response of early transition metal (Sc)-doped aluminum nitride nanocages is comparable to those of their alkali-metal-doped analogues.

Metal doped armchair graphene nanoribbons: electronic structure, carrier mobility and device properties

2019 ◽  
Vol 21 (4) ◽  
pp. 1830-1840 ◽  
Author(s):  
J. N. Han ◽  
X. He ◽  
Z. Q. Fan ◽  
Z. H. Zhang
Keyword(s):  
Electronic Structure ◽  
Carrier Mobility ◽  
Graphene Nanoribbons ◽  
Metal Doping ◽  
Armchair Graphene Nanoribbons ◽  
Metal Doped ◽  
Device Properties ◽  
Armchair Graphene

Metal doping induced tuning effects on geometry, electronic structure, carrier mobility, and device properties of armchair graphene nanoribbons are studied systematically and analyzed in detail.

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