Multi-walled carbon nanotubes supported Pd composite nanoparticles hydrothermally produced from technical grade PdO precursor

The Significant Role of NiO in Enhancing the Electrocatalytic Activity of the Pyrolysis Products of the Mixture Containing PdO and Multiwalled Carbon Nanotubes for EOR

“…Through comparing the XRD pattern of catalyst a with the standard XRD pattern of the metallic Pd, it was confirmed that a proper amount of metallic Pd (JCPDS, Card No.00‐046‐1043) was contained in catalyst a. As discussed in our previous work, in the pyrolysis process, probably, some reducing agents like H 2 and CO were formed due to the following chemical reaction, i. e., C+ H 2 O→H 2 + CO. Therefore, some metallic metals of Pd could be prepared under an appropriate condition.…”

“…For catalyst a, b, c and m, five typical diffraction peaks corresponding to NiO, which were respectively positioned at 37.6° (111), 43.6° (200), 63.2° (220), 75.9° (311) and 79.7° (222), are clearly exhibited, strongly indicating the presence of NiO (JCPDS, Card No.00‐002‐1216) in the final samples . For catalyst o, b and c, a small diffraction peak centered at about 34° was clearly displayed which strongly verified the presence of Pd oxides in the resultant catalysts basing on the former work concerning PdO ,. Through comparing the XRD pattern of catalyst a with the standard XRD pattern of the metallic Pd, it was confirmed that a proper amount of metallic Pd (JCPDS, Card No.00‐046‐1043) was contained in catalyst a.…”

Influence of Metal Oxides on Platinum Activity towards Methanol Oxidation in H2SO4 solution

“…[8] AP d/ multi-walled carbonn anotube (MWCNT) electrocatalyst was fabricated through ah ydrothermalr eaction, using PdO as the precursor. [9,10] The electrocatalyst was heated for 3hand demonstrated 6.7 times better activity towards ethanol oxidationr eaction than that heated for 5h at an applied potentialo fÀ0.24 V( vs. SCE). [9] Reduced charge-transfer resistance and increased reaction kinetics were explored by using electrochemical impedance spectroscopy and Ta fel experiments,r espectively, with increasing Pd loading at carboxyl MWCNTs.C yclic voltammetryt esting revealed am ass activity of 1.23 Amg À1 for the ethanol oxidation reaction at Pd/carboxyl MWCNTsw ith an ominal ratio of 2:1.…”

“…[9,10] The electrocatalyst was heated for 3hand demonstrated 6.7 times better activity towards ethanol oxidationr eaction than that heated for 5h at an applied potentialo fÀ0.24 V( vs. SCE). [9] Reduced charge-transfer resistance and increased reaction kinetics were explored by using electrochemical impedance spectroscopy and Ta fel experiments,r espectively, with increasing Pd loading at carboxyl MWCNTs.C yclic voltammetryt esting revealed am ass activity of 1.23 Amg À1 for the ethanol oxidation reaction at Pd/carboxyl MWCNTsw ith an ominal ratio of 2:1. [11] At ransmissione lectron microscopy study revealed that the carboxyl groups could act as anchors to perfectly disperse palladium nanoparticles.…”

Optimal Electrocatalytic Pd/MWNTs Nanocatalysts toward Formic Acid Oxidation

“…Palladium (Pd) with similar properties to Pt (same group in the periodic table, same fcc crystal structure, similar atomic size) and certain advantages compared to Pt (lower price, greater resistance to CO, and inherently faster kinetics in alkaline medium) is emerging as a suitable substitute for Pt in fuel cells [18–20]. In order to make full usage of Pd atoms, substrates are usually introduced to facilitate the dispersion of Pd nanoparticles (NPs) and to endow new properties to the final nanocomposites without causing any “pollutants” [21–24]. Carbon nanotubes (CNTs) have emerged as a promising candidate due to their excellent electronic properties, good physicochemical stability, and large specific surface area [25,26].…”