TY - JOUR
T1 - Mono-dispersed transition metal nanoparticles on boron-substituted carbon support and applications in hydrogen storage
AU - Jeong, Youmi
AU - Chung, T. C.Mike
N1 - Funding Information:
The authors would like to thank the US Department of Energy and the Hydrogen Sorption Center of Excellent (lead: National Renewable Energy Laboratory) for their financial support. The authors would also like to thank NIST (Drs. Craig Brown and Dan Neumann) for their assistance in prompt gamma ray activation analysis (PGAA).
PY - 2011/1
Y1 - 2011/1
N2 - To prepare mono-dispersed transition metal nanoparticles on activated C supports is a long scientific challenge, due to low graphene surface energy. Few polar functional groups in activated C are only located on the plane edges, which are intrinsically difficult to prevent metal clustering, especially at elevated temperatures. This paper discusses a versatile method in preparing stable and uniform transition metal (Pt, Pd, Ti, etc.) nanoparticles (diameter ∼2 nm), using a newly-developed boron-substituted carbon (BCx) support, containing uniform B atoms distributed in the graphene layer structure, which provides a strong specific interaction; this interaction is formed by d-electrons back-donation from transition metals to the empty p-orbital in substituted B atoms. The BCx support shows good adsorption capacity of metal precursors in solutions, and securing the forming metal nanoparticles during thermal reduction at a high temperature (>500 °C). The resulting Pt/BC12 - with only 0.7 wt.% Pt content - exhibits very high surface activities. At ambient temperature, it offers an impressive hydrogen adsorption capacity at ∼0.5 wt.% per 500 m2/g surface area, which is more than 5 times higher than the corresponding activated C material with the same surface area.
AB - To prepare mono-dispersed transition metal nanoparticles on activated C supports is a long scientific challenge, due to low graphene surface energy. Few polar functional groups in activated C are only located on the plane edges, which are intrinsically difficult to prevent metal clustering, especially at elevated temperatures. This paper discusses a versatile method in preparing stable and uniform transition metal (Pt, Pd, Ti, etc.) nanoparticles (diameter ∼2 nm), using a newly-developed boron-substituted carbon (BCx) support, containing uniform B atoms distributed in the graphene layer structure, which provides a strong specific interaction; this interaction is formed by d-electrons back-donation from transition metals to the empty p-orbital in substituted B atoms. The BCx support shows good adsorption capacity of metal precursors in solutions, and securing the forming metal nanoparticles during thermal reduction at a high temperature (>500 °C). The resulting Pt/BC12 - with only 0.7 wt.% Pt content - exhibits very high surface activities. At ambient temperature, it offers an impressive hydrogen adsorption capacity at ∼0.5 wt.% per 500 m2/g surface area, which is more than 5 times higher than the corresponding activated C material with the same surface area.
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U2 - 10.1016/j.carbon.2010.08.053
DO - 10.1016/j.carbon.2010.08.053
M3 - Article
AN - SCOPUS:78049527004
SN - 0008-6223
VL - 49
SP - 140
EP - 146
JO - Carbon
JF - Carbon
IS - 1
ER -