One-Pot Pyrolysis Method to Fabricate Carbon Nanotube Supported Ni Single-Atom Catalysts with Ultrahigh Loading
Journal Article
·
· ACS Applied Energy Materials
- Curtin Univ., Perth, WA (Australia)
- Australian Synchrotron, Clayton, ViIC (Australia)
- Univ. of Western Australia, Perth, WA (Australia)
- Chinese Academy of Sciences, Shenyang, LN (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Sunshine Coast, Maroochydore DC, QLD (Australia); The Univ. of Queensland, Brisbane (Australia)
- Univ. of Surrey, Guildford (United Kingdom)
The practical application of single atom catalysts (SACs) is constrained by the low achievable loading of single metal atoms. In this work, nickel SACs stabilized on a nitrogen-doped carbon nanotube structure (NiSA-N-CNT) with ultrahigh Ni atomic loading up to 20.3 wt % have been successfully synthesized using a new one-pot pyrolysis method employing Ni acetylacetonate (Ni(acac)2) and dicyandiamide (DCD) as precursors. The yield and formation of NiSA-N-CNT depends strongly on the Ni(acac)2/DCD ratio and annealing temperature. Pyrolysis at 350 and 650 °C led to the formation of Ni single atom dispersed melem and graphitic carbon nitride (Ni-melem and Ni-g-C3N4). Transition from a stacked and layered Ni-g-C3N4 structure to a bamboo-shaped tubular NiSA-N-CNT structure most likely occurs via a solid-to-solid curling or rolling-up mechanism, thermally activated at temperatures of 700–900 °C. Extended X-ray absorption fine structure (EXAFS) experiments and simulations show that Ni single atoms are stabilized in the N-CNT structure through nitrogen coordination, forming a structure with four nearest N coordination shell surrounded by two carbon shells, Ni–N4. The NiSA-N-CNT catalysts show an excellent activity and selectivity for the electrochemical reduction of CO2, achieving a turnover frequency (TOF) of 11.7 s–1 at -0.55 V (vs RHE), but a low activity for the O2 reduction and O2 evolution reactions, as compared to Ni nanoparticles supported on N-CNTs.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
- Sponsoring Organization:
- Australian Research Council (ARC); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725
- OSTI ID:
- 1607268
- Journal Information:
- ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 10 Vol. 1; ISSN 2574-0962
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Unusual synergetic effect of nickel single atoms on the electrocatalytic activity of palladium for alcohol oxidation reactions in alkaline media
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journal | January 2018 |
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