Electrochemical in-situ activation of Fe-oxide nanowires for the reverse water gas shift reaction

Electrochemical promotion of copper nanoparticles for the reverse water gas shift reaction

“…Moreover, metals including Ru, Pd, Ni, Co, and Fe dispersed on various solid electrolytes like Y 2 O 3 -doped barium zirconate (BZY, H + conductor), Y 2 O 3 -stabilized ZrO 2 (YSZ, O 2− conductor), and β′′-Al 2 O 3 (Na + or K + conductor) have been used as catalysts in CO 2 hydrogenation. 21–26 In EPOC, promoting ion species are supplied to or removed from catalyst electrochemically by polarizing between counter electrode and catalyst which also functions as the working electrode. 11 Positive polarization refers to applying a positive potential difference between the working and the reference electrodes ( U WR > 0) or passing current from the working electrode to the counter electrode, and negative polarization is referred to the opposite situation.…”

“…To overcome the drawback of the high price of Pd and Ru and process CO 2 conversion more economically, inexpensive catalysts including iron (Fe) and cobalt (Co) are taken as alternatives to noble metals. Panaritis et al 25 illustrated that the oxidation state of FeO x /YSZ could be controlled by the application of a small current or potential and thereby influenced the RWGS reaction rate. Similarly, Zagoraios et al 26 showed an EPOC effect for RWGS reaction by using CoO x /YSZ, which also possessed multiple oxidation states.…”

Recent Advances in Supported Metal Catalysts and Oxide Catalysts for the Reverse Water-Gas Shift Reaction

“…Although the CO selectivities of these oxide catalysts are desirable in RWGSR, their disadvantages of lower CO 2 activation and feasible poisons and sintering are hindering their extended application. In order to address these issues, persistent studies have concentrated on the fabrication of composite oxides (Liu et al, 2015;Dai et al, 2018;Ronda-Lloret et al, 2018;Panarities et al, 2020), spinel oxides (i.e., ZnAl 2 O 4 , ZnCr 2 O 4 , CuAl 2 O 4 , CoAl 2 O 4 , etc.) (Joo and Jung, 2003;Bahmanpour et al, 2019Bahmanpour et al, , 2020 LaNiO 3 , La 0.9 Sr 0.1 NiO 3+δ , La 0.9 Sr 0.1 FeO 3−δ , La 0.9 Sr 0.1 Ni 0.5 Fe 0.5 O 3−δ , La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3−δ , SrCe 0.9 Y 0.1 O 3−δ , etc.)…”

“…In order to address these issues, persistent studies have concentrated on the fabrication of composite oxides (i.e., CuO/ZnO/Al 2 O 3 , NiO/CeO 2 , ZnO/Al 2 O 3 , ZnO/Cr 2 O 3 , CuOx/CeO 2 , CuO–CeO 2 /SBA-15, In 2 O 3 -CeO 2 , FeO x , etc.) (Liu et al, 2015 ; Dai et al, 2018 ; Ronda-Lloret et al, 2018 ; Panarities et al, 2020 ), spinel oxides (i.e., ZnAl 2 O 4 , ZnCr 2 O 4 , CuAl 2 O 4 , CoAl 2 O 4 , etc.) (Joo and Jung, 2003 ; Bahmanpour et al, 2019 , 2020 ), solid solution oxides (i.e., Zn x Zr 1−x O 2−y , Ce 0.5 Zr 0.5 O 2 , Ni x Ce 0.75 Zr 0.25−x O 2 , etc.)…”

Demystifying the Atomistic Origin of the Electric Field Effect on Methane Oxidation

“…[13][14][15][16][17] Such an insight is a crucial factor in interpreting the experimental observations and putting conclusions from past studies on solid theoretical ground. An elucidation on what is occurring during the reaction could allow for the development of an efficient and novel catalytic electrode design that can fully exploit the power of EPOC, i.e., operate at rather low temperature and still display superior catalytic activity for key reactions such as the complete oxidation of methane 18,19 , NOx reduction 20 , complete oxidation of volatile organic compounds (VOCs) [21][22][23] and CO2 hydrogenation [24][25][26] .…”