|
|---|
|
|
|
|
|
K*N
发帖数: 7494 | 1 这个是简介， 有兴趣的发我信箱联系方式。
The oxygen reduction reaction (ORR) at the cathode of fuel cells and metal&#
8722;air batteries requires efficient electrocatalysts to accelerate its
reaction rate due to its sluggish kinetics. Nitrogen- and phosphorus-doped
biocarbon has been fabricated via a simple and low-cost biosynthesis method
using yeast cells as a precursor. The as-prepared biocarbon exhibits
excellent electrocatalytic activity for the ORR. An onset potential of -0.
076 V (vs. Ag/AgCl) and a negative shift of only about 29 mV in the half-
wave potential of the biocarbon as compared to commercial Pt/C (20wt % Pt on
Vulcan XC-72, Johnson Matthey) is achieved. The biocarbon possesses
enhanced electron poverty in carbon atoms and decreased less electroactive
nitrogen and phosphorus dopants due to the biomineralization during the
synthesis. The surface gap layer along with the mesopores in the biocarbon
increases accessible active sites and facilitates the mass transfer during
the ORR. These factors correlate with the high ORR activity of the biocarbon
. The results demonstrate that biomineralization plays a critical role in
tailoring the structure and the electrocatalytic activity of the biocarbon
for ORR. |
|
|
|
|
|
|
