Iron doped nickel ditelluride hierarchical nanoflakes arrays directly grown on nickel foam as robust electrodes for oxygen evolution reaction

A CoNi telluride heterostructure supported on Ni foam as an efficient electrocatalyst for the oxygen evolution reaction

“…4e, the 0.4CoNi LDH@Te-180C electrode exhibits a super large C dl value (11.6 mF cm −2 ), which is much greater than those of Ni-Te-180C (2.1 mF cm −2 ), CoNi LDH-180C (3.7 mF cm −2 ) and bare NF (1.4 mF cm −2 ), indicating that the Co additive can significantly enhance the ECSA, which means more potential active sites available for the oxygen evolution reaction. 1,53 Furthermore, the evolution of O 2 gas at the 0.4CoNi LDH@Te-180C electrode as a function of time was also monitored at a constant current density of 20 mA cm −2 using Agilent 8860 gas chromatography. The amount of measured H 2 and O 2 with a theoretical ratio of 2 : 1 was detected, which matches well with the calculated results.…”

Solvent-Free Mechanochemical Synthesis and Characterization of Nickel Tellurides with Various Stoichiometries: NiTe, NiTe2 and Ni2Te3

“…The results are of considerable interest in the view of further applications of mechanochemically prepared nickel tellurides. One particularly promising area seems to be the use of nickel tellurides as photo-electrocatalysts and photocatalysts for overall water splitting [ 53 , 54 ], making those materials attractive choices as wide band gap semiconductors.…”

Mn-Based Hierarchical Polyhedral 2D/3D Nanostructures MnX2 (X = S, Se, Te) Derived from Mn-Based Metal–Organic Frameworks as High-Performance Electrocatalysts for the Oxygen Evolution Reaction

“…The specific capacitance C sp was obtained from a previously reported study, in the case of metal chalcogenides for catalyzing oxygen evolution reaction, which is 0.04 mF cm –2 . The specific activity was estimated on account of the ECSA and was obtained using the following equation , The roughness factor ( R f ) is a ratio of the electrochemically active surface area to the geometric surface area Impedance spectroscopy was performed in the frequency range of 0.1–100 000 Hz with an amplitude of 5 mV. The Nyquist plot was obtained at the applied potential assuming the onset of the oxygen evolution reaction, which were approximately 1.42 and 1.40 V vs RHE for MnX 2 /C-HPNs and 3.1%Fe–MnX 2 /C-HPNs, respectively, for comparison.…”

“…The value of charge-transfer resistance denotes the barrier for the transfer of electrolyte anions at the electrode to initiate OER. Therefore, electronic conductivities were calculated using R ct values across the electrode–electrolyte interface via the following equation where l is the length of the working electrode (1 cm), A the geometrical surface area of the working electrode (0.5 cm 2 ), and R ct the charge-transfer resistance.…”

“…The modification in the electronic state of the catalyst can be achieved through the bonding of heteroatoms (S, Se, and Te) or cation doping. The trend of electrochemical activity in metal chalcogenides can be best explained on the basis of the electronegativity of chalcogens, which increases down the group (from S to Te). − As the difference in electronegativity increases, more covalent characteristics can be observed in nanostructures, which are considered to be beneficial for the catalytic activity of OER. It was recently reported that the electrocatalytic properties of transition metal tellurides are more remarkable as compared with metal selenides and sulfides because of the high metallic characteristics of tellurium, which induces larger conductivity into the transition metals (Ni, Co, and Mn) active toward OER .…”