Xin He, Min Wang, Zixuan Wei, Yang Wang, Jie Wang, Haojie Zang, Prof. Lingxia Zhang
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引用次数: 0
摘要
二氧化碳的过度排放引发了日益严重的环境问题。电化学二氧化碳还原反应(CO2RR)是降低二氧化碳浓度并同时生产高价值化学品和燃料的有效方法。在 CO2RR 反应中,Cuδ+ 物种被认为是获得多碳化合物的理想活性位点,然而,它们在反应过程中很容易被还原成 Cu0,无法保持对 C2+ 产物的满意选择性。在此,我们通过一步法合成了由纳米片组成的 Cu2(OH)2CO3 微球,该微球对 C2+ 产物具有优异的法拉第效率,在 H 电池中 -1.55 V 相对于 RHE 时高达 76.29 %,在流动池中 -100 mA cm-2 时高达 78.07 %。电化学测量、原位拉曼光谱和衰减全反射红外光谱以及理论计算均表明,与 Cu(OH)2 和 CuO 相比,Cu2(OH)2CO3 中的双含 O 阴离子基团(OH- 和 CO32-)可有效稳定 Cuδ+ 物种,促进 CO2 的吸附和活化,提高 *CO 的覆盖率和 *CO-*COH 的耦合,从而维持 C2+ 产物的大量生成。
Dual-Anion-Stabilized Cuδ+ Sites in Cu2(OH)2CO3 for High C2+ Selectivity in the CO2 Electroreduction Reaction
The excessive emission of CO2 has aroused increasingly serious environmental problems. Electrochemical CO2 reduction reaction (CO2RR) is an effective way to reduce CO2 concentration and simultaneously produce highly valued chemicals and fuels. Cuδ+ species are regarded as promising active sites to obtain multi-carbon compounds in CO2RR, however, they are easily reduced to Cu0 during the reaction and fail to retain the satisfying selectivity for C2+ products. Herein, via a one-step method, we synthesize Cu2(OH)2CO3 microspheres composed of nanosheets, which has achieved a superior Faraday efficiency for C2+ products as high as 76.29 % at −1.55 V vs. RHE in an H cell and 78.07 % at −100 mA cm−2 in a flow cell. Electrochemical measurements, in situ Raman spectra and attenuated total reflectance infrared spectra (ATR-IR) as well as the theoretic calculation unveil that, compared with Cu(OH)2 and CuO, the dual O-containing anionic groups (OH− and CO32−) in Cu2(OH)2CO3 can effectively stabilize the Cuδ+ species, promote the adsorption and activation of CO2, boost the coverage of *CO and the coupling of *CO−*COH, thus sustain the flourishment of C2+ products.
期刊介绍:
ChemSusChem
Impact Factor (2016): 7.226
Scope:
Interdisciplinary journal
Focuses on research at the interface of chemistry and sustainability
Features the best research on sustainability and energy
Areas Covered:
Chemistry
Materials Science
Chemical Engineering
Biotechnology