一种用于电化学CO还原的金属有机框架衍生的Cu O C催化剂及局部pH变化的影响。
A Metal-Organic Framework derived Cu O C Catalyst for Electrochemical CO Reduction and Impact of Local pH Change.
作者信息
Sikdar Nivedita, Junqueira João R C, Dieckhöfer Stefan, Quast Thomas, Braun Michael, Song Yanfang, Aiyappa Harshitha B, Seisel Sabine, Weidner Jonas, Öhl Denis, Andronescu Corina, Schuhmann Wolfgang
机构信息
Analytical Chemistry-Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, 44780, Bochum, Germany.
Chemical Technology III; Faculty of Chemistry and CENIDE Center for Nanointegration, University Duisburg-Essen, Carl-Benz Straße 199, 47057, Duisburg, Germany.
出版信息
Angew Chem Int Ed Engl. 2021 Oct 18;60(43):23427-23434. doi: 10.1002/anie.202108313. Epub 2021 Sep 23.
Developing highly efficient and selective electrocatalysts for the CO reduction reaction to produce value-added chemicals has been intensively pursued. We report a series of Cu O C nanostructured electrocatalysts derived from a Cu-based MOF as porous self-sacrificial template. Blending catalysts with polytetrafluoroethylene (PTFE) on gas diffusion electrodes (GDEs) suppressed the competitive hydrogen evolution reaction. 25 to 50 wt % teflonized GDEs exhibited a Faradaic efficiency of ≈54 % for C products at -80 mA cm . The local OH ions activity of PTFE-modified GDEs was assessed by means of closely positioning a Pt-nanoelectrode. A substantial increase in the OH /H O activity ratio due to the locally generated OH ions at increasing current densities was determined irrespective of the PTFE amount.
开发用于将CO还原反应以生产增值化学品的高效且选择性的电催化剂一直是人们积极追求的目标。我们报道了一系列源自铜基金属有机框架（MOF）作为多孔自牺牲模板的CuOC纳米结构电催化剂。在气体扩散电极（GDE）上用聚四氟乙烯（PTFE）混合催化剂抑制了竞争性析氢反应。25至50 wt%的含氟聚合物GDE在-80 mA cm时对C产物表现出约54%的法拉第效率。通过紧密放置一个铂纳米电极来评估PTFE改性GDE的局部OH离子活性。无论PTFE的量如何，都确定了由于在增加的电流密度下局部产生的OH离子导致OH/H₂O活性比大幅增加。
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