Platinum quantum dots-decorated MXene-derived titanium dioxide nanowire/Ti_(3)C_(2) heterostructure for use in solar-driven gas-phase carbon dioxide reduction to yield value-added fuels  

作　　者：Kamakshaiah Charyulu Devarayapalli S.V.Prabhakar Vattikuti Dong Jin Kim Youngsu Lim Bolam Kim Gyuhyeon Kim Dae Sung Lee 

机构地区：[1]Department of Environmental Engineering,Kyungpook National University,Buk-gu,Daegu 41566,Republic of Korea [2]Research Institute of Environmental Science&Technology,Core Research Institute,Kyungpook National University,Buk-gu,Daegu 41566,Republic of Korea [3]School of Mechanical Engineering,Yeungnam University,Gyeongsan 38541,Republic of Korea [4]School of Architecture,Civil,Environmental and Energy Engineering,Kyungpook National University,Buk-gu,Daegu 41566,Republic of Korea

出　　处：《Journal of Energy Chemistry》2023年第7期627-637,I0013,共12页能源化学（英文版）

基　　金：supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the South Korean Ministries of Education(NRF-2021R1I1A3059469,NRF2018R1A6A1A03024962);Science and ICT(NRF-2020R1A2C2100746)。

摘　　要：Solar-driven photocatalytic CO_(2) reduction to produce valuable chemicals and fuels offers an attractive strategy in alleviating the energy crisis.Pt quantum dots(PtQDs)with TiO_(2) nanowire(TiO_(2)NW)/Ti_(3)C_(2) MXene heterostructures(Pt-TiO_(2)NW/Ti_(3)C_(2)) with tight interfacial contacts between the various components were prepared at room temperature via oxidation reactions.The incorporated PtQDs played crucial roles as electron conduction bridges supported by the cocatalyst effect,effectively enhancing the separation efficiencies of photoinduced electron/hole pairs and improving CO_(2) reduction under simulated solar light irradiation.The Pt-TiO_(2)NW/Ti_(3)C_(2) heterostructures exhibited remarkable carbon monoxide(CO)and methane(CH_(4)) production at respective rates of 38.14 and 36.15μmol g^(-1)after 10 h of simulated solar light irradiation,an apparent quantum yield of 1.68%,and 79.2%selectivity for CH4.The photocatalytic activities of the Pt-TiO_(2) NW/Ti_(3)C_(2) heterostructures for CO_(2) reduction were significantly enhanced compared to those of TiO_(2)NW/Ti_(3)C_(2) and the single-component photocatalysts,and they exhibited remarkable stabilities even after five cycles.In addition,the densities of states and electronic characteristics of Ti_(3)C_(2) MXene and Pt-TiO_(2)NW/Ti_(3)C_(2) were studied using density functional theory,and a synergistic mechanism of the improvement in CO_(2) photoreduction is proposed.

关 键 词：MXene CO_(2)reduction Density functional theory Quantum dot PHOTOCATALYST 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X701[环境科学与工程—环境工程]