Wang N et al. (2015), Three-Dimensional Hierarchical Nanostructured C...

ECB-ART-46772

Nanomicro Lett 2015 Jan 01;74:347-352. doi: 10.1007/s40820-015-0049-1.

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Three-Dimensional Hierarchical Nanostructured Cu/Ni-Co Coating Electrode for Hydrogen Evolution Reaction in Alkaline Media.

Wang N , Hang T , Chu D , Li M .

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In this work, three-dimensional hierarchical nickel-cobalt alloy coating for hydrogen evolution cathode was fabricated by electrodeposition processes. The coatings'' morphology evolves from sea cucumber-like nanostructure to caterpillar-like one with the increase of cobalt content. A large amount of nanometric "steps," served as the active sites for hydrogen evolution reaction, were observed. According to Tafel polarization measurements, the exchange current density of the as-synthesized coating with hierarchical nanostructure was 21.9 times compared with that of flat nickel coating. In addition, the hierarchical coating also displayed good electrochemical stability from the galvanostatic test.

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Genes referenced: LOC100887844 LOC115925415

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References [+] :

Jin, In situ cobalt-cobalt oxide/N-doped carbon hybrids as superior bifunctional electrocatalysts for hydrogen and oxygen evolution. 2015, Pubmed

	Fig. 1. a The formation schematic of the hierarchical structured electrodes. SEM images of varying hierarchical structures with different magnification: b, c Cu/Ni, e, f Cu/Ni–Co 10, h, i Cu/Ni–Co 30. TEM images of the single nanocone d Ni, j Ni–Co 30, and the inset is the corresponding SAED image. g HRTEM image of Ni–Co 10 nanocone, and the inset is the enlarged view of the white encircled part
	Fig. 2. XPS spectra taken from the nanostructured electrode of Ni–Co 10 and Ni–Co 30: a Ni 2p3/2, b Co 2p3/2
	Fig. 3. a The cathodic current–potential curves in HER for the three hierarchical structures and the flat Ni. b The cathodic potential curves in HER for Cu/Ni–Co 30 and Cu/Ni coatings