Hydrothermal Synthesis of Zinc Cobalt Telluride Nanorod towards Oxygen Evolution Reaction (OER)

Abstract

With an increasing demand for clean and sustainable energy which is directly related to water splitting, regenerative fuel cells, metal-air batteries, etc., exploring an efficient and inexpensive electrocatalyst with highly stable for oxygen evolution reaction (OER) is very important. In this article, here we demonstrated the nanorod Zn-Co-Te, is found to be a very good electrocatalyst for oxygen evolution reaction (OER) in alkali medium (KOH, pH = 15.14) with onset potential 1.38 V vs RHE. When this catalyst used as an electrocatalyst Zn-Co-Te nanorod obtained low overpotential 221 mV at a 10 mAcm−2 current density with Tafel slope 91 mV/dec and high stability within three months.

One-Pot Hydrothermal Synthesis of Nickel Cobalt Telluride Nanorods for Hybrid Energy Storage Systems

“…Among them, NCT-1 exhibits a low Tafel value, which suggests the fastest HER kinetics of NCT-1 in the electrocatalytic performance. This performance is compared to other reported Ni- and Co-based tellurides, such as NiTe 2 /CFC (356 mV/dec) for oxygen evolution reaction (OER), Ni 3 Te 2 (54 mV/dec) toward OER, NiTe/NF (74 mV/dec) for OER, Co 1.11 Te 2 /C (77 mV/dec) for HER, NiTe (87.4 mV/dec) for OER, CoTe NSs/CoTe 2 NTs (57 mV/dec) for HER, NiCo 2 Te 4 /PTDCA (38 and 50 mV/dec) during HER and OER, and ZnCoTe (91 mV/dec) and ZnCoSe (135 mV/dec) for OER . To check the reversibility of the electrode, the cyclic voltammetry (CV) was performed for 1000 cycles between 0.2 V and the overpotential at 10 mA/cm 2 .…”

“…The overpotentials at the current densities of 10 and 20 mA/cm 2 are 319, 461, and 509 mV and 349, 489, and 507 mV [versus reversible hydrogen electrode (RHE)] for the NCT-1, NCT-2, and NCT-3 materials, respectively. The Tafel plot plays a significant role in water splitting and indicates the kinetic pathway; a good catalyst has a low Tafel slope value Figure b gives the Tafel slope value of NCT-1 (24 mV/dec), NCT-2 (30 mV/dec), and NCT-3 (36 mV/dec).…”

“…The Tafel plot plays a significant role in water splitting and indicates the kinetic pathway; a good catalyst has a low Tafel slope value. 56 Figure 5b gives the Tafel slope value of NCT-1 (24 mV/dec), NCT-2 (30 mV/dec), and NCT-3 (36 mV/dec). Among them, NCT-1 exhibits a low Tafel value, which suggests the fastest HER kinetics of NCT-1 in the electrocatalytic performance.…”

“…This performance is compared to other reported Ni-and Co-based tellurides, such as NiTe 2 /CFC (356 mV/ dec) for oxygen evolution reaction (OER), 57 Ni 3 Te 2 (54 mV/ dec) toward OER, 58 NiTe/NF (74 mV/dec) for OER, 59 Co 1.11 Te 2 /C (77 mV/dec) for HER, 60 NiTe (87.4 mV/dec) for OER, 61 CoTe NSs/CoTe 2 NTs (57 mV/dec) for HER, 62 NiCo 2 Te 4 /PTDCA (38 and 50 mV/dec) during HER and OER, 36 and ZnCoTe (91 mV/dec) and ZnCoSe (135 mV/ dec) for OER. 56 To check the reversibility of the electrode, the cyclic voltammetry (CV) was performed for 1000 cycles between 0.2 V and the overpotential at 10 mA/cm 2 . The polarization curves of NCT-1 cycled before and after 1000 cycles are given in Figure 5c, demonstrating the good cyclic performance.…”

Sphere-Shaped Bimetallic Sulphoselenide: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

“…The CV curve of the prepared nanomaterials is shown in Figure S1 (Supporting Information). The Randles-Sevcik equation was used to determine the electroactive surface area of the investigated materials where I p , S , D , v , A , and n indicate peak current, strength or concentration of K 4 [Fe­(CN) 6 ] (0.1 M), diffusion coefficient (0.76 × 10 –5 cm 2 /s), scan rate (0.05 mV/s), designed electrode electroactive surface, and number of electron transfer ( n = 1), respectively.…”