Journal
ADVANCED MATERIALS
Volume 33, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202103533
Keywords
electrocatalysis; graphene; high current density; hydrogen evolution reaction; porous films; single-atom catalysts
Categories
Funding
- National Natural Science Foundation of China [51902099]
- Hunan high-level talent gathering project [2019RS1021]
- Fundamental Research Funds for the Central Universities [531119200087]
- Innovative Research Groups of Hunan Province [2020JJ1001]
- Hunan Province Natural Science Foundation [2020JJ4204]
- Youth Innovation Promotion Association CAS
Ask authors/readers for more resources
A carbon film embedded with single-atom Co-N-C sites was designed to achieve exceptional HER performance at high current densities, delivering 500 and 1000 mA cm(-2) in acid with overpotentials of 272 and 343 mV, respectively, and operating stably for at least 32 hours under static conditions. The findings pave the road towards rational design of SACs with improved activity and stability at high current densities in gas-evolving electrocatalytic processes.
Metal- and nitrogen-doped carbon (M-N-C) materials as a unique class of single-atom catalysts (SACs) have increasingly attracted attention as the replacement of platinum for the hydrogen evolution reaction (HER); however, their employment as HER electrodes at high current densities of industrial level remains a grand challenge. Herein, an aligned porous carbon film embedded with single-atom Co-N-C sites of exceptional activity and stability at high current densities is designed. Within the film, the atomic CoNx moieties exhibit high intrinsic activity, while the multiscale porosity of the carbon frameworks with vertically aligned microchannels afford facilitated mass transfer under the conditions of high production rate and ultrathick electrodes. Moreover, the superwetting properties of the film promote electrolyte wetting and ensure the timely removal of the evolving H-2 gas bubbles. The as-designed film can work as an efficient HER electrode to deliver 500 and 1000 mA cm(-2) in acid at overpotentials of 272 and 343 mV, respectively, and can operate uninterruptedly and stably at 1000 mA cm(-2) for at least 32 h under static conditions. These findings pave the road toward the rational design of SACs with improved activity and stability at high current densities in gas-evolving electrocatalytic processes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available