Beaded stream-like CoSe₂ nanoneedle array for efficient hydrogen evolution electrocatalysis

Abstract

Beaded-stream-like nanoneedles array based on earth-abundant and inexpensive CoSe2 efficiently splits water into hydrogen.

Rational Design and Synthesis of Extremely Efficient Macroporous CoSe2-CNT Composite Microspheres for Hydrogen Evolution Reaction

“…In the Co 2p spectrum of the CoSe 2 –CNT composite microspheres (Figure b), the Co 2p 3/2 signal can be fitted to four chemical states, which are associated with intermediate valences produced in the selenization process and surface oxidation due to exposure to the atmosphere. The main peaks appear at binding energies of 778.2 eV for Co 2p 3/2 and 793.1 eV for Co 2p 1/2 , and their satellite peaks (marked as “Sat.”) appear at 784.0 and 799.4 eV, respectively . These pronounced peaks are characteristics of Co 2+ cations, which indicate the successful formation of CoSe 2 .…”

“…In order to develop highly efficient HER electrocatalysts, research in the field has been mostly focused on nanostructured materials with a large number of active sites and highly conductive supporting materials . To maximize hydrophilicity and active site exposure, many works have focused on the growth of nanowires, nanobelts, and nanosheets on the conductive substrates such as carbon fiber and Ti foil . The synthesis methods of these previously reported hydrogen evolution catalysts were mostly limited to the hydrothermal method and electrodeposition.…”

“…Nanostructured cobalt‐selenide‐based materials with high electrical conductivities have been also studied as efficient electrocatalysts for HER . A CoSe 2 nanowire array on carbon cloth, prepared through a simple two‐step hydrothermal preparative strategy, exhibited excellent catalytic activity (10 mA cm –2 at an overpotential of ≈130 mV) and durability in an acidic medium .…”

EDTA-assisted hydrothermal synthesis of flower-like CoSe2 nanorods as an efficient electrocatalyst for the hydrogen evolution reaction

“…Sun's group synthesized CoSe 2 nanowires array on carbon cloth, which only needed 164 mV overpotential to gain a current density of 100 mA cm −2 in acid solution [21] . Chen's group fabricated beaded stream-like CoSe 2 nanoneedle array on Ti foil, which achieved a current density of 20 mA cm −2 with a small overpotential of 125 mV in acid media [22] . Qiao's group obtained CoSe 2 necklace-like nanowires supported by carbon fiber paper, which manifested a small Tafel slope of 34 mV dec −1 [23] .…”

Selective Growth of Zn–Co–Se Nanostructures on Various Conductive Substrates for Asymmetric Flexible Hybrid Supercapacitor with Enhanced Performance

“…[15] Nanostructured transitionmetal oxides [16][17][18][19][20] and conducting polymers are widely exploited as a positive electrode material for SCs because of their unique multiple oxidation states of transition metal ions, reversible faradic reactions, and high specific capacitance properties compared to that of carbonaceous materials (e.g., graphite, activated carbon). Besides, metal selenides, as an important class of metal chalcogenides, possess high electrical conductivity and widely employed as electrocatalysts, [26][27][28][29] dye-sensitized solar cells (DSSCs), [30,31] and SCs. Indeed, some metal nitrides [24] and sulfides [25] have been reported as new electroactive materials for SCs and often show better performance than oxides.…”