Multiwalled carbon nanotube wrapped hydroxyapatite, convenient synthesis via microwave assisted solid state metathesis

Highly Efficient Ethanol Electrooxidation on a Synergistically Active Catalyst Based on a Pd‐Loaded Composite of Hydroxyapatite

“…In summary, superior electrochemical performance was attained by synthesis of the HA‐MWCNT composite with the solid‐state metathesis approach . In accordance with TEM studies, the Pd/HA‐MWCNTs(MW) has a more homogeneous structure and thus more accessible Pd active sites across the HA‐MWCNT composite.…”

“…It could be supposed that the charge transfer occurs via Pd NPs, the HA bridging layer, the MWCNTs, and finally the glassy carbon electrode (GCE) surface. However, it is believed that a direct charge transfer between HA and GCE surface is inefficient in the absence of MWCNTs . Consequently, an inefficient charge transfer between Pd NPs and GCE could be expected when the HA phase is not formed all over the MWCNTs.…”

“…The TEM micrograph of Pd/HA‐MWCNTs(MW) is shown in Figure . Obviously, the HA deposition on MWCNTs has been performed efficiently in this approach . Here, a uniform shell of HA around the entire length of the MWCNT was achieved .…”

“…According to JCPDS# 09‐0432, HA‐related peaks at 2 θ values of approximately 23, 26, 32, and 49° are indexed as the (111), (002), (112), and (213) planes of HA . In comparison with Pd/HA‐MWCNTs(MW), these peaks are broadened in the spectrum of Pd/HA‐MWCNTs(SP) sample.…”

“…To attain the best physicochemical properties, the solution‐based precipitation (wet) and solid‐state deposition (solventless) approaches as two distinct methods were used for the synthesis of HA‐MWCNT substrates. The Pd NPs‐loaded composite that was produced by the solution‐based precipitation method is denoted as Pd/HA‐MWCNTs(SP) and the composite that was prepared through the solid‐state metathesis approach is denoted as Pd/HA‐MWCNTs(MW).…”