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      Facet-dependent solar ammonia synthesis of BiOCl nanosheets via a proton-assisted electron transfer pathway

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          Abstract

          The distinct structures of oxygen vacancies on different BiOCl facets strongly affect their solar N 2 fixation via a proton-assisted electron transfer pathway.

          Abstract

          Under the pressure of a fossil fuels shortage and global climate change, solar ammonia synthesis and the need to develop N 2 fixation under mild conditions is becoming more urgent need; however, their intrinsic mechanisms still remain unclear. Herein, we demonstrate that the kinetic inertia of N 2 can be overcome using oxygen vacancies (OVs) of BiOCl as the catalytic centers to create lower energy molecular steps, which are amendable for the solar light driven N–N triple bond cleavage via a proton-assisted electron transfer pathway. Moreover, the distinct structures of OVs on different BiOCl facets strongly determine the N 2 fixation pathways by influencing both the adsorption structure and the activation level of N 2. The fixation of terminal end-on bound N 2 on the OVs of BiOCl {001} facets follows an asymmetric distal mode by selectively generating NH 3, while the reduction of side-on bridging N 2 on the OVs of BiOCl {010} facets is more energetically favorable in a symmetric alternating mode to produce N 2H 4 as the main intermediate.

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                Author and article information

                Journal
                NANOHL
                Nanoscale
                Nanoscale
                Royal Society of Chemistry (RSC)
                2040-3364
                2040-3372
                2016
                2016
                : 8
                : 4
                : 1986-1993
                Affiliations
                [1 ]Key Laboratory of Pesticide & Chemical Biology of Ministry of Education
                [2 ]Institute of Environmental Chemistry
                [3 ]College of Chemistry
                [4 ]Central China Normal University
                [5 ]Wuhan 430079, P. R. China
                Article
                10.1039/C5NR07380D
                94a25a8a-4c1c-4420-ab7a-43df94015cad
                © 2016
                History

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