Collision induced charge separation in ground-state water splitting dynamics

2018 ◽  
Vol 20 (17) ◽  
pp. 12229-12240 ◽  
Author(s):  
Kentaro Yamamoto ◽  
Kazuo Takatsuka
Keyword(s):  
Water Splitting ◽  
Ground State ◽  
Charge Separation ◽  
Electron Hole ◽  
Hole Transfer ◽  
State Water ◽  
Induced Charge ◽  
State Charge

The pathway of one-way electron–hole transfer induced by proton reciprocating motions, thereby realizing the collision induced ground-state charge separation.

GROUND STATE CHARGE OF O(3) NONLINEAR σ MODEL SOLITONS IN 2+1 DIMENSIONS

1994 ◽  
Vol 09 (20) ◽  
pp. 3657-3667
Author(s):  
M. RAVENDRANADHAN ◽  
M. SABIR
Keyword(s):  
Angular Momentum ◽  
Ground State ◽  
Flow Analysis ◽  
Background Field ◽  
Bound State ◽  
Fermion Mass ◽  
Spectral Flow ◽  
Bound State Spectrum ◽  
Induced Charge ◽  
State Charge

The ground state charge of (2+1)-dimensional nonlinear σ model solitons is calculated by a combination of adiabatic method and spectral flow analysis. Induced charge is calculated by evolving adiabatically the fields from a vacuum having a background field which has spectral symmetry. The spectral flow is calculated by analyzing the bound state spectrum. It is shown that the ground state charge gets contribution only from the lowest angular momentum states and is discontinuous at the fermion mass. It is also shown that the ground state charge is independent of the way in which the final configuration is obtained.

scholarly journals Radiative and Non-Radiative Recombination Pathways in Mixed-Phase TiO2 Nanotubes for PEC Water-Splitting

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 204 ◽  
Author(s):  
Rambabu Yalavarthi ◽  
Alberto Naldoni ◽  
Štěpán Kment ◽  
Luca Mascaretti ◽  
Hana Kmentová ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Transfer Rate ◽  
Electrochemical Impedance ◽  
Mixed Phase ◽  
Transfer Efficiency ◽  
Electron Hole ◽  
Surface Trap ◽  
Hole Transfer ◽  
Recombination Processes

Anatase and rutile mixed-phase TiO2 with an ideal ratio has been proven to significantly enhance photoelectrochemical (PEC) activity in water-splitting applications due to suppressing the electron–hole recombination. However, the mechanism of this improvement has not been satisfactory described yet. The PEC water oxidation (oxygen evolution) at the interface of TiO2 photoanode and electrolyte solution is determined by the fraction of the photogenerated holes that reach the solution and it is defined as the hole transfer efficiency. The surface and bulk recombination processes in semiconductor photoanodes majorly influence the hole transfer efficiency. In this work, we study the hole transfer process involved in mixed-phase TiO2 nanotube arrays/solution junction using intensity-modulated photocurrent and photovoltage spectroscopy (IMPS and IMVS); then, we correlate the obtained hole transfer rate constants to (photo)electrochemical impedance spectroscopy (PEIS) measurements. The results suggest that the enhanced performance of the TiO2 mixed-phase is due to the improved hole transfer rate across the TiO2/liquid interface as well as to the decrease in the surface trap recombination of the holes.

Benzoannelated quinone methides

1982 ◽  
Vol 47 (6) ◽  
pp. 1645-1653 ◽  
Author(s):  
Bohumír Koutek ◽  
Milena Píšová ◽  
Josef Krupička ◽  
Antonín Lyčka ◽  
Dobroslav Šnobl ◽  
...  
Keyword(s):  
Ground State ◽  
Charge Separation ◽  
Side Chain ◽  
Exocyclic Double Bond ◽  
Electronic Effects ◽  
Quinone Methides ◽  
Factors Influencing ◽  
Nmr Data ◽  
State Charge ◽  
C Nmr

On the basis of detailed study of UV, IR, 13C NMR and E1/2 data of quinone methides V-VII three dominant factors influencing the behaviour of benzoannelated compounds must be considered: 1) electronic effects of both the exocyclic carbon substituents and the fused rings, 2) the extent to which the substituents are displaced out of the plane of the exocyclic double bond through steric interference between the side-chain substituents and peri-hydrogens and 3) the extent of the angular distorsion of the quinone-like rings. The ground state charge separation (~0.2e) in nonannelated derivatives was found to be strongly minimized by annelation of two benzene units to the parent systems. Near parallelism with this phenomenon was also observed in both the carbonyl vibration frequency and 13C NMR data.

Towards zero bias photoelectrochemical water splitting: onset potential improvement on a Mg:GaN modified-Ta3N5 photoanode

2018 ◽  
Vol 6 (31) ◽  
pp. 15265-15273 ◽  
Author(s):  
Ela Nurlaela ◽  
Yutaka Sasaki ◽  
Mamiko Nakabayashi ◽  
Naoya Shibata ◽  
Taro Yamada ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Electron Hole ◽  
Zero Bias ◽  
Hole Transfer ◽  
Potential Shift ◽  
Onset Potential ◽  
Potential Improvement ◽  
Mg Doped

A remarkable onset potential shift has been demonstrated on Ta3N5 modified with a Mg:GaN layer. The Mg-doped GaN band positions facilitate more efficient electron/hole transfer to/from Ta3N5, inducing a negative onset potential shift to 0 vs. RHE.

scholarly journals Anion-enhanced excited state charge separation in a spiro-locked N-heterocycle-fused push-pull zinc porphyrin

2021 ◽  
Author(s):  
Mandeep K. Chahal ◽  
Anuradha Liyanage ◽  
Ajyal Z. Alsaleh ◽  
Paul A. Karr ◽  
Jonathan P. Hill ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Charge Separation ◽  
Charge Transfer Complex ◽  
Zinc Porphyrin ◽  
New Type ◽  
State Charge

A new type of push–pull charge transfer complex, viz., a spiro-locked N-heterocycle-fused zinc porphyrin, ZnP-SQ, is shown to undergo excited state charge separation, which is enhanced by axial F− binding to the Zn center.

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