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Title: The Role of Adventitious Carbon in Photo-catalytic Nitrogen Fixation by Titania

Journal Article · · Journal of the American Chemical Society

Photo-catalytic fixation of nitrogen by titania catalysts at ambient conditions has been reported for decades, yet the active site capable of adsorbing an inert N2 molecule at ambient pressure and the mechanism of dissociating the strong dinitrogen triple bond at room temperature remain unknown. In this work in situ near-ambient-pressure X-ray photo-electron spectroscopy and density functional theory calculations are used to probe the active state of the rutile (110) surface. Furthermore, the experimental results indicate that photon-driven interaction of N2 and TiO2 is observed only if adventitious surface carbon is present, and computational results show a remarkably strong interaction between N2 and carbon substitution (C*) sites that act as surface-bound carbon radicals. Additionally, a carbon-assisted nitrogen reduction mechanism is proposed and shown to be thermodynamically feasible. The findings provide a molecular-scale explanation for the long-standing mystery of photo-catalytic nitrogen fixation on titania. The results suggest that controlling and characterizing carbon-based active sites may provide a route to engineering more efficient photo(electro)-catalysts and improving experimental reproducibility.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES), Scientific User Facilities Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1656473
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 45 Vol. 140; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (30)

Photofixierung von Stickstoff an nanostrukturierten Eisentitanatfilmen journal November 2001
Photocatalytic Conversion of CO 2 into Renewable Hydrocarbon Fuels: State-of-the-Art Accomplishment, Challenges, and Prospects journal May 2014
Promoted Fixation of Molecular Nitrogen with Surface Oxygen Vacancies on Plasmon-Enhanced TiO 2 Photoelectrodes journal March 2018
Photoreduction of Nitrogen on TiO2 and TiO2-Containing Minerals book January 2011
X-ray photoelectron spectroscopy (XPS) studies of hydrogen reduced rutile (TiO2-x) surfaces journal November 1982
Photocatalytic reduction of CO2 with H2O on various titanium oxide catalysts journal October 1995
Surface defects of TiO2(110): A combined XPS, XAES AND ELS study journal April 1984
The Auger spectrum of solid ammonia journal January 1979
Photo-oxidation of short-chain hydrocarbons over titania journal July 2001
Carbon-doped TiO2 photocatalyst synthesized without using an external carbon precursor and the visible light activity journal September 2009
Recent progress towards the electrosynthesis of ammonia from sustainable resources journal May 2017
Photon-Driven Nitrogen Fixation: Current Progress, Thermodynamic Considerations, and Future Outlook journal March 2017
Computational Screening of Rutile Oxides for Electrochemical Ammonia Formation journal September 2017
Analysis of Photocatalytic Nitrogen Fixation on Rutile TiO 2 (110) journal February 2018
Photolysis of Water and Photoreduction of Nitrogen on Titanium Dioxide journal October 1977
Role of Water and Carbonates in Photocatalytic Transformation of CO 2 to CH 4 on Titania journal March 2011
Conversion of Dinitrogen to Ammonia by FeN 3 -Embedded Graphene journal July 2016
Photocatalytic Conversion of Nitrogen to Ammonia with Water on Surface Oxygen Vacancies of Titanium Dioxide journal July 2017
High-Efficiency “Working-in-Tandem” Nitrogen Photofixation Achieved by Assembling Plasmonic Gold Nanocrystals on Ultrathin Titania Nanosheets journal June 2018
Photoelectron Spectroscopic Investigation of Nitrogen-Doped Titania Nanoparticles journal October 2004
The Nature of Water Nucleation Sites on TiO 2 (110) Surfaces Revealed by Ambient Pressure X-ray Photoelectron Spectroscopy journal June 2007
Properties of O 2 - and OH Formed in TiO 2 Aqueous Suspensions by Photocatalytic Reaction and the Influence of H 2 O 2 and Some Ions journal April 2002
Nitrate formation from atmospheric nitrogen and oxygen photocatalysed by nano-sized titanium dioxide journal July 2013
Fullerene Embedded Shape Memory Nanolens Array journal November 2013
Challenges in reduction of dinitrogen by proton and electron transfer journal January 2014
Photocatalytic methane conversion coupled with hydrogen evolution from water over Pd/TiO 2 journal January 2017
On the mechanism of nitrogen photofixation at nanostructured iron titanate films journal January 2006
Isolated catalyst sites on amorphous supports: A systematic algorithm for understanding heterogeneities in structure and reactivity journal May 2013
Nature of the use of adventitious carbon as a binding energy standard journal May 1995
First-Principles View on Photoelectrochemistry: Water-Splitting as Case Study journal June 2017

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