ZIF-8@ZIF-67-Derived Co Embedded into Nitrogen-Doped Carbon Nanotube Hollow Porous Carbon Supported Pt as an Efficient Electrocatalyst for Methanol Oxidation

Abstract

It is of prime importance to develop anode electrocatalysts for direct methanol fuel cells (DMFCs) with good performance, which is critical for their commercial applications. Metal-organic framework (MOF)-derived carbon materials are extensively developed as supports of catalysts. Herein, Co embedded nitrogen-doped carbon nanotube hollow porous carbon (Co-NCNT-HPC) derived from MOFs have been fabricated, which were synthesized by pyrolyzing at an optimized temperature of 800 °C using ZIF-8@ZIF-67 as a precursor. The presence of ZIF-8@ZIF-67 ensures the doping of nitrogen and the large specific surface area of the support materials at high temperatures. A Pt/Co-NCNT-HPC800 sample, which was synthesized using Co-NCNT-HPC800 as a support, showed an enhanced mass activity of 416.2 mA mg−1Pt for methanol oxidation reaction (MOR), and the onset potential of COad oxidation of 0.51 V, which shifted negatively about 0.13 V compared with Pt/C (20%). Moreover, the Pt/Co-NCNT-HPC800 sample exhibits high stability. This work provides a facile strategy for MOF-derived carbon materials to construct advanced electrocatalysts for MOR.

Recent Advances in Functional Polymer Materials for Energy, Water, and Biomedical Applications: A Review

“…Several parameters influencing the efficiency of DMFCs have been reported, and the effects of the electrocatalysts used have been widely studied. These electrocatalysts are mainly conducting polymers, having primarily 1D and 2D nanostructures [105][106][107][108][109][110].…”

Natural Porous Carbon Derived from Popped Rice as Anode Materials for Lithium-Ion Batteries

“…Moreover, porous carbons can obtain a higher capacity than graphitized carbon due to expanded interlayer distances and shortened ion transportation pathways [7]. Apart from battery applications, the carbonaceous-and porous-based materials have also been utilized in several applications, such as electrocatalysts and capacitors [17][18][19]. Commonly, the techniques of synthesized amorphous carbon are directly pyrolysis or hydrothermal treatment, which use lower temperatures than the techniques of synthesized graphite.…”

Synthesis of Carbon Nanoparticles with Cobalt-Rich Shell via Pyrolysis of Zn-ZIF@Co/Zn-ZIF: Relevance of Co(III) Precursors

“…ZIFs with a heterogeneous distribution of multiple metals can also be synthesized in a stepwise manner. For instance, Co-based ZIF-8@ZIF-67 was synthesized by adding Zn-based ZIF-8 seeds to the synthetic solution and vice versa. − The thermal decomposition of the synthesized ZIF-8@ZIF-67 generated Zn and Co codoped CNPs with a carbon nanotube structure on the surface. Such raw materials are critical for the synthesis of highly efficient electrocatalysts. , The kinetically controlled one-pot synthesis of ZIFs with a core–shell structure has also been investigated by separately controlling the precipitation of a Zn or Co precursor .…”

“…For instance, Co-based ZIF-8@ZIF-67 was synthesized by adding Zn-based ZIF-8 seeds to the synthetic solution and vice versa. − The thermal decomposition of the synthesized ZIF-8@ZIF-67 generated Zn and Co codoped CNPs with a carbon nanotube structure on the surface. Such raw materials are critical for the synthesis of highly efficient electrocatalysts. , The kinetically controlled one-pot synthesis of ZIFs with a core–shell structure has also been investigated by separately controlling the precipitation of a Zn or Co precursor . However, to the best of our knowledge, there have been no reported studies on the one-pot synthesis of core–shell structured ZIFs via the chemical modification of Co or Zn precursors to control the kinetics of precipitation and crystallization.…”

“…Such raw materials are critical for the synthesis of highly efficient electrocatalysts. 22,23 The kinetically controlled one-pot synthesis of ZIFs with a core−shell structure has also been investigated by separately controlling the precipitation of a Zn or Co precursor. 24 However, to the best of our knowledge, there have been no reported studies on the one-pot synthesis of core− shell structured ZIFs via the chemical modification of Co or Zn precursors to control the kinetics of precipitation and crystallization.…”