Preparation and characteristic of three-dimensional NiCo alloy/carbon composite monoliths with well-defined macropores and mesostructured skeletons
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Binary NiCo alloy/carbon composite monoliths with well-defined macropores and mesostructured skeletons have been facilely fabricated by a solgel process followed by heat treatment at Ar atmosphere, and the morphology control, heat treatment and pore structures of the composite monoliths were investigated in detail. Synergic control of phase separation and solgel transition allows the formation of three-dimensional nickel–cobalt hydroxide-based xerogel monoliths with interconnected macropores and co-continuous solid skeletons. Heat treatment at 270–340 °C promotes the precipitation of nickel–cobalt oxides and the pyrolysis of PAA into carbon, and at and above 400 °C, some in situ formed carbon can carbothermally reduce nickel–cobalt oxides to generate the NiCo alloy and form NiCo alloy/carbon composites, without any deterioration of the macrostructure of monoliths. The as-prepared NiCo alloy/carbon composite monolith possesses hierarchical pore structure with a macropore size of 0.5 μm, a mesopore size of 2 nm, a specific surface area up to 167 m2 g−1 and a porosity as high as 80%. This three-dimensional hierarchically porous binary NiCo alloy/carbon monoliths are promisingly used in wide applications such as catalysis, filtration, separation, sensor.
This work was supported by the High Science and Technique Brainstorm Project of Zhejiang Province of China (No. 2017C01002) and the National Natural Science Foundation of China (21875217 and 51372225).
- 18.Zubris M, King RB, Garmestani H, Tannenbaum R (2005) FeCo nanoalloy formation by decomposition of their carbonyl precursors. J Mater Chem 15:1277–1285Google Scholar
- 25.Huang XH, Dai B, Ren Y, Xu J, Zhu P (2015) Preparation and study of electromagnetic interference shielding materials comprised of Ni–Co coated on web-like biocarbon nanofibers via electroless deposition. J Nanomater 2015:1–7Google Scholar
- 32.Xie W, Cheng HF, Chu ZY, Chen ZH (2008) Development on preparation of magnetic metallic fiber absorber. J Mater Eng 03:72–76 (Chinese) Google Scholar
- 55.Yang XH, Yin CS (2004) Study on hydrolysis constants pK1 of metal ions by using artificial neural network. Chin J Inorg Chem 20:1334–1338 (Chinese) Google Scholar
- 56.Liu GC (2002) Relation between metal ion hydrolysis constant and valence electron average binding energy. J Haerbin Univ 23:40–41 (Chinese) Google Scholar