1 research outputs found
Pt<sub>3</sub>Co/Co Composite Catalysts on Porous N‑Doped Carbon Support Derived from ZIF-67 with Enhanced HER and ORR Activities
The primary challenge for efficient H2 evolution
and
hydrogen energy conversion is to develop highly active and stable
catalysts with simple and reliable preparation processes. In this
regard, we have designed and synthesized a porous carbon-supported
low-Pt alloy catalyst (Pt3Co/Co@C composite) using ZIF-67
as a template. It showed uniformly dispersed Pt3Co/Co on
the porous carbon layer due to the confinement effect of the porous
carbon layer. Pt3Co/Co@C demonstrated excellent activity
for the hydrogen evolution reaction in the full pH range, with an
overpotential of 187 mV in 0.5 M H2SO4 to attain
100 mA/cm2 as well as long-term stability. It also displayed
superior mass activity for the oxygen reduction reaction (ORR) at
0.85 V (vs RHE) compared to the commercial Pt/C. Furthermore, the
Pt3Co/Co@C catalyst exclusively enabled a four-electron
reaction process under ORR conditions without the competitive pathway
to H2O2. The current work provides guidance
for the design and facile synthesis of Pt-based catalysts with enhanced
performance