Toward an Effective Control of the H-2 to CO Ratio of Syngas through CO2 Electroreduction over Immobilized Gold Nanoparticles on Layered Titanate Nanosheets
- 주제(키워드) CO production , CO2 reduction reaction , electrocatalysis , Au catalyst , titanate nanosheets , syngas conversion
- 주제(기타) Chemistry, Physical
- 설명문(일반) [Mota, Filipe Marques; Lee, Ji-Eun; Piao, Huiyan; Choy, Jin-Ho; Kim, Dong Ha] Ewha Womans Univ, Coll Nat Sci, Div Mol & Life Sci, Dept Chem & Nano Sci, 52 Ewhayeodae Gil, Seoul 03760, South Korea; [Dang Le Tri Nguyen; Hwang, Yun Jeong] KIST, Clean Energy Res Ctr, 5 Hwarang Ro 14 Gil, Seoul 02792, South Korea; [Dang Le Tri Nguyen; Hwang, Yun Jeong] Korea Univ Sci & Technol UST, KIST Sch, Div Energy & Environm Technol, 5 Hwarang Ro 14 Gil, Seoul 02792, South Korea; [Piao, Huiyan; Choy, Jin-Ho] Ewha Womans Univ, Coll Nat Sci, Ctr Intelligent Nanobio Mat CINBM, Dept Chem & Nano Sci,Div Mol & Life Sci, 52 Ewhayeodae Gil, Seoul 03760, South Korea; [Kim, Dong Ha] Ewha Womans Univ, Coll Engn, Div Chem Engn & Mat Sci, 52 Ewhayeodae Gil, Seoul 03760, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000151614
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acscatal.8b00647
초록/요약
In recent years, the electroreduction of CO2 to valuable products has emerged as a rational answer to rising CO2 emissions and a strategic approach to incorporate renewable electricity from intermittent sources (e.g., wind and solar) into the global energy supply. The reduction of CO2 to CO has been highlighted in the widely explored industrial conversion of syngas (CO and H-2) to fuels. Herein, we report a promising electrocatalyst incorporating well-dispersed gold nanoparticles (Au NPs) on ultrathin titanate nanosheets (TiNS). By tuning the contents of Au (in the ranges of 0 to 93 wt % Au) in the hybrid Au/TiNS architecture, CO product selectivity was effectively controlled (in the range of CO Faradaic efficiency from 3 to over 80%) with the sole additional formation of H-2, which is of pronounced industrial interest. Most importantly, a control of both component amounts was suggested to result in a variation of corresponding electronic properties based on the interaction between Au NP and TiNS substrate, dictating the stabilization of formed reaction intermediates and resulting product selectivity. In addition, our Au/TiNS achieved optimally high CO and H-2 production current densities, with 73 wt % Au at the low cathodic potential region (-0.6 to -0.9 V-RHE). The suggested synergetic effect between both catalytic components underlines the promising character of this hybrid system and is expected to significantly add to the strategic production of syngas for subsequent applications.
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