Development
of a Pd-based catalyst with highly active and durable properties for
formic acid oxidation reaction at the anode remains an important matter
of interest in the research community. Herein, we have designed novel
coal-based carbon fibers (Coal-CFs) with dicyandiamide (DCD) as nitrogen
(N) source, triphenylphosphine (TPP) as phosphorus (P) source dual-doped
to support Pd catalysts (Pd/NP-Coal-CFs(DCD/TPP)), which
exhibit superior catalytic performance toward formic acid oxidation
reaction. Mass activity of formic acid oxidation of Pd/NP-Coal-CFs(DCD/TPP)
catalyst is 536.6 mA·mg–1
Pd, which
is 2.5 times higher than that of Pd/Coal-CFs catalyst. The higher
specific surface areas, exclusive electron transport path, and the
high synergistic interaction of N and P are the favorable phenomena
for catalytic performance. The addition of coal not only increases
the abundant defects sites but also makes the utilization of coal
with high added value. This N and P dual-doped catalyst inspires an
idea for promoting applications in practical fuel cells.
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.
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