Origin of peculiar electrochemical phenomena in direct carbon fuel cells

Exploration of Complex Electrochemical and Chemo‐mechanical Behavior of Solid Oxide Fuel Cell Fueled with Pyrolysis Bio‐oil

“…Moreover, the ionic conductivity of the electrolyte exhibits Arrhenius‐like dependence on temperature, hence they tend to increase the O 2− ions transfer at high temperatures but the presence of impurities may curtail the probability of the O 2− ions reaching the anode/electrolyte interface to react with fuel gases while permitting their oxidation reactions with the Ni metals producing electricity (Eq. ) . The Ni oxidation has inferior OCV value than that of reactive gases (H 2 , CO, and hydrocarbons) explaining thereby the decrease in OCV values with respect to increase in temperatures (Figure (a)) .…”

“…) . The Ni oxidation has inferior OCV value than that of reactive gases (H 2 , CO, and hydrocarbons) explaining thereby the decrease in OCV values with respect to increase in temperatures (Figure (a)) . …”

“…The degradation of the SOFC performance at elevated temperatures could be related to the state of the Ni electro‐catalyst that is probably partially turned into NiO by oxidation. The anode catalytic surface becomes partially formed by NiO known as insulating material with almost nil electrochemical activity . This phenomenon can be related to the imbalanced amount of reactive gases fuel evolved from the bio‐oil decomposition in the anodic three‐phase boundary and that of oxide ions (O 2− ) which traveled through the electrolyte towards the anode.…”

“…The SOFC degradation after 6 operating hours may be due to the observed coarsening of the Ni particles which could be attributed to the deformation that happen because of NiO formation which is volumetrically larger than Ni . The chemo‐mechanical change in the Ni‐SDC anode induces a loss of porosity causing a decrease in the reaction sites and a possible disturbance of the gases mass transport through the electrode.…”

Cu-modified Ni foams as three-dimensional outer anodes for high-performance hybrid direct coal fuel cells

“…Coal, an abundant and competitive fuel, is expected to maintain dominance in the power generation industries of developing countries due to its superior high energy density and friendliness for storage and transportation [1][2][3]. However, developing highly efficient and environmentally-benign coal utilization technology remains a challenge [4][5][6]. Direct carbon fuel cells (DCFCs) have attracted considerable attention as a promising option that directly converts the chemical energy of carbon into electricity without the Carnot cycle.…”