纳米金属催化剂的制备方法

Ag@Pd-Ag nanocubes
Jumei Li, et al. J. Am. Chem. Soc. 2015, 137, 7039−7042
A-BC metallic nanocatalysts
HAuCl4 AgNO3 K2PtCl4
AA
Au nanorods as seed
Au/Ag/Pt hetero-nanostructure（AAPHNs）
Chen L X, et al. J. Power Sources, 2016, 302: 140-145.
A-AB metallic nanocatalysts
Ag nanocubes
AA
PVP
Stable suspension containing Ag nanocubes
Na2PdCl4 AgNO3
140℃, 90 min
Chen S, et al. Angew. Chem. Int. Ed. 2015, 54, 108-113.
A-B metallic nanocatalysts
Au
MnO
Mn(acac)2
KBEt3H 240℃ △T
Air Mn/Au=1
Au
AuMn
Au
MnO
Au
(a) (a) (c)
SAMs
Self-assembled monolayers
VS
Cao K, et al. Scientific reports, 2015, 5. 8470
Liquid phase method
Heating
Precursor HAuCl4
Au
Reducing agent
AB-CD
AB-BA
AB
A
Metal nanocatalysts
Green Chem, 2012,14, 111-116
Metal nanocatalysts
Higher surface-to-volume ratio
H2
More active surface atoms
Dealloying process
Preparation methods
A-B
A-AB
A-BC
Monometallic nanocatalysts
Lee H E, et al. ACS Nano. 2015, 9(8): 8384-8393.
A-B metallic nanocatalysts
H2PtCl6 CuCl2 KI Poly (vinyl pyrrolidone) (PVP) ethylene glycol (EG)
Xie X, et al. Adv. Mater. 2015, 27, 5573-5577
AB-CD metallic nanocatalysts
CuCl2+HAuCl4
Oleylamin e
175℃, 3h
Fe(CO)5+Mn2 (CO)10 AuCu 220℃, 20min 380℃ annealing for 20h Cubic AuCu-FeMn
Synthesis of CuNi nanocrystals
Cu(acac)2 (13 g, 20 g) Ni(acac)2 (13 g, 20 g)
Diphenyl ether Oleylamine Oleic acid
20mg Borane morpholine 40mg Borane morpholine
Gas phase method
Liquid phase method
……
Dealloying process
Nanosphere
Xu Y, et al. Nanotechnology, 2014, 25(44): 445602.
Nanowire
Sponge-like Nanoporous Gold sphere
Pt/FeOx
Nature communications, 2014, 5. 5634
Angew. Chem. Int. Ed. 2014, 126: 9636-9640
Open your mind
What’s your idea?
Acknowledgement
THANK YOU
Any question?
Nitric acid Room temperature
Nanoporous gold (NPG)
Zhang L, et al. Adv. Mater. (2014), 26(8), 1289-1294
Gas phasຫໍສະໝຸດ Baidu method
Vapor is formed Nanoparticals are formed
A solid precursor material
Thermal energy are applied resistance heating method radio-frequency heating
Vapor and gas are cooled Reactive Gas
Nanometric crystal particales are formed
tetragonal AuCu-FeMn
Gong M, et al. Nano letters, 2015, 15(12), 8347-8353
Catalytic effect
GOOD
But,
What’s the problem?
Expensive
The solution?
Put them aside! Otherwise, Make the best of it!!
Nanoporous Pt–Fe Alloy Nanowires
Electrospinning
Dealloying
Shui J, et al. Adv. Fun. Mater, 2011, 21(17): 3357-3362.
Nanoporous Gold films
65:35 (at%) Ag/Au sheets
240℃ 30 min
octahedra
350℃
2h
nanocube
Wang M.L, et al. J. Am. Chem. Soc. 2015, 137, 14027−14030
Single-atom catalysis New IDEA Single-Atom Catalysis
Qiao B, et al. Nature chemistry, 2011, 3(8): 634-641.
The preparation methods of metal nanocatalysts
Introduction
Nothing can help Br
Meet
Br FeBr3
Fe coming
+
Fe
……
Catalyst
Useful
Efficient
Important
Enzyme Homogeneous Heterogeneous
550℃ evaporate SiO2substrate dewetting Au/Ge droplets
Au&Ge film
Au/Ge eutectic melt
solification dealloying
nanoporous single crystals of gold
Khristosov M K, et al. Nature communications, 2015, 6.
MnO
(b)
Huiyuan Zhu et al. Angew. Chem. Int. Ed. 2014, 53, 12508 –12512
AB-BA metallic nanocatalysts
AA: Reducing agent NH2NH2 : Stronger reducing agent
Core：Pt: Au= 4:1 Shell：Pt: Au= 2:3
direct heating
sputtering “Add” or “not Add”
Vapor phase templated-assembly technique
Hajfathalian M, J. Phys. Chem. C, 2015, 119(30): 17308-
Area-selective Atomic Layer Deposition