A chromium oxide coated nickel/yttria stabilized zirconia electrode with a heterojunction interface for use in electrochemical methane reforming

Abstract

This work investigated the use of nickel/yttria stabilized zirconia (Ni/YSZ) coated in situ with chromium oxide (Cr 2 O 3 ) for electrochemical methane (CH 4 ) reforming in solid oxide electrolysers. Combined analysis using X-ray diffraction spectroscopy, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy confirmed the formation of Cr 2 O 3 on the Ni surface with a heterojunction interface formed by reducing nickel chromite (NiCr 2 O 4 ) to a core-shell structure. The electrical properties of the Cr 2 O 3 coated Ni/YSZ were investigated and correlated to the electrochemical performance. Significant improvements of electrode activity were achieved with Cr 2 O 3 coated Ni/YSZ in contrast to traditional Ni/YSZ in a CH 4 atmosphere. Strong carbon deposition resistance was also observed in a methane-carbon dioxide (CH 4 -CO 2 ; 1 : 1) atmosphere at 800 C. Significant enhancement in electrochemical CH 4 -CO 2 reforming was successfully achieved in oxide ion conducting electrolysers with Cr 2 O 3 coated Ni/YSZ cathodes.

Hydrogen Production from Steam Reforming of Acetic Acid as a Model Compound of the Aqueous Fraction of Microalgae HTL Using Co-M/SBA-15 (M: Cu, Ag, Ce, Cr) Catalysts

“…Besides, it is noteworthy that Co-Cr/SBA-15 reduced the coke production two times compared to Co/SBA-15. It is known that Cr 2 O 3 has been used as an oxide catalyst with outstanding carbon deposition resistance properties [72,73]. In our case, the reduction in carbon deposition can be also ascribed to the role of chromium avoiding the formation of large Co crystallites as it could be observed by TEM and measured by the Scherrer equation, because smaller Co crystallites will prevent the initiation of carbon nucleation leading to coke formation [74].…”

Very low thermal conductivity in lanthanum phosphate–zirconia ceramic nanocomposites processed using a precipitation–peptization synthetic approach

“…Zirconia (ZrO 2 ) is a widely used ceramic material for applications ranging from electrodes 15 to fuel cells 16 and catalysts. 17,18 Yttria stabilised ZrO 2 (YSZ) is reported to perform well as thermal barrier coatings (TBC) and is used to protect as well as insulate hot-section metal components in advanced gas-turbine and diesel engines.…”

“…9,10 LaPO 4 being a soft ceramic with hardness values less than 5 GPa 11 finds application in the processing of machinable and high temperature stable ceramic composites. [12][13][14] Zirconia (ZrO 2 ) is a widely used ceramic material for applications ranging from electrodes 15 to fuel cells 16 and catalysts. 17,18 Yttria stabilised ZrO 2 (YSZ) has been reported to perform well as thermal barrier coatings (TBCs) and is used to protect as well as insulate hot-section metal components in advanced gas-turbine and diesel engines.…”

A study on corrosion mechanism of 15CrMo in saline (Na2SO4) steam at high temperature

“…Therefore, the investigation on corrosion deserves careful attention. [1][2][3][4][5] Corrosion behavior has a vital effect on the performance of alloys, [6][7][8] which could significantly impact the efficiency and safety of the equipment in the industrial processes. In boilers, pipe broken accidents due to material failure have triggered off many severe economic and safety problems.…”