CO-Reductive and O2-Oxidative Annealing Assisted Surface Restructure and Corresponding Formic Acid Oxidation Performance of PdPt and PdRuPt Nanocatalysts
Abstract:Formic acid oxidation reaction (FAOR) at anode counterpart incurs at substantial high overpotential, limiting the power output efficiency of direct formic acid fuel cells (DFAFCs). Despite intense research, the lack of high-performance nanocatalysts (NCs) for FAOR remains a challenge in realizing DFAFC technologies. To surmount the overpotential losses, it is desirable to have NCs to trigger the FAOR as close to the reversible conditions (i.e. with over-potential loss as close to zero as possible). Herein, Pd-… Show more
“…The desired voltage to drive the maximum CO ads oxidation kinetics was represented by the positions of the CO ads oxidation peaks in a CO stripping curve. 61 In 0.5 mol L −1 FA, CO was permitted to adsorb on the surfaces of the bare-Pt, NiO x /Pt, FeO x /NiO x /Pt and a-FeO x /NiO x /Pt electrodes for 10 min at open circuit potential. The adsorbed CO layer was next stripped electrochemically (oxidatively) in 0.5 mol L −1 H 2 SO 4 at a potential scan rate of 50 mV s −1 , yielding the oxidation peaks displayed in Fig.…”
“…The desired voltage to drive the maximum CO ads oxidation kinetics was represented by the positions of the CO ads oxidation peaks in a CO stripping curve. 61 In 0.5 mol L −1 FA, CO was permitted to adsorb on the surfaces of the bare-Pt, NiO x /Pt, FeO x /NiO x /Pt and a-FeO x /NiO x /Pt electrodes for 10 min at open circuit potential. The adsorbed CO layer was next stripped electrochemically (oxidatively) in 0.5 mol L −1 H 2 SO 4 at a potential scan rate of 50 mV s −1 , yielding the oxidation peaks displayed in Fig.…”
“…In recent years, heterogeneous catalysts have attracted large interest for formic acid decomposition because of enhanced separability, reusability, and relatively low reaction temperatures (less than 80 • C). The heterogeneous catalysts Pd, Au, or Ag and their alloys have been commonly studied [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. A variety of materials have additionally been investigated as catalyst supports for the dehydrogenation of formic acid, such as activated carbon [22][23][24], zeolites [16,25], amines [26][27][28][29], metal organic frameworks (MOFs) [11,13,30,31], and macroreticular resins [32][33][34].…”
The use of hydrogen as a renewable fuel has attracted great attention in recent years. The decomposition of formic acid under mild conditions was investigated using a 2%Pd6Zn4 catalyst in a batch reactor. The results showed that the conversion of formic acid increases with reaction temperature and with the formic acid concentration. A process-simulation model was developed to predict the decomposition of formic acid using 2%Pd6Zn4 in a batch reactor. The model demonstrated very good validation with the experimental work. Further comparisons between the 2%Pd6Zn4 catalyst and a commercial Pd/C catalyst were carried out. It was found that the 2%Pd6Zn4 demonstrated significantly higher conversions when compared with the commercial catalyst.
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