Previous studies were conducted on Cu xCo 2- xO 4 (CCO) catalysts, which have higher conductivities as a result of the Cu doping of Co 3O 4. Methods to improve electrical conductivity and activity for electrocatalysts include composite transition metal catalyst synthesis, structure optimization and surface area enhancement using highly conductive materials. However, the electrical conductivity of Co is low thus, investigation into methods to improve the conductivity is required. In particular, Co 3O 4 has emerged as an attractive candidate because of its efficient electrode performance resulting from its nanostructure and low cost. For example, OER catalysts comprising inexpensive and abundant resources such as transition metal (such as Co, Ni, Fe, and Cu) oxides, phosphides, and borates are drawing attention. Therefore, there has been ongoing research into earth-abundant transition metal-based electrodes that can replace noble metal electrodes. The commonly used Ir- or Ru-based electrodes have high OER activities but are costly because of the use of noble metals, which have limited reserves. In this regard, developing an electrocatalyst that can expedite the OER has drawn much interest and intense efforts. Specifically, the kinetics of OER is slow and require a higher overpotential than HER at actual operating current density of electrochemical water splitting. However, an additional overpotential is required in both the oxygen and hydrogen evolution reactions (OER and HER, respectively). The theoretical potential required for water splitting is 1.23 V. In addition, it can be ecofriendly because of the possibility of using renewable energy sources such as photovoltaic, wind, and hydroelectric power. The optimized catalyst also showed high activity and stability under high pH conditions, demonstrating its potential as a low cost, highly efficient OER electrode material.Įlectrochemical water splitting is an effective method of hydrogen production. Thus, the prepared CCO electrode exhibited enhanced OER activity (1.6 V at 261 mA/cm 2) compared to those of CCOH (1.6 V at 144 mA/cm 2), Co 3O 4 (1.6 V at 39 mA/cm 2), and commercial IrO 2 (1.6 V at 14 mA/cm 2) electrodes. The CCO electrode annealed at 250 ☌ had a high surface area and efficient electron conduction pathways as a result of the direct growth on the Ni foam. In addition, it was observed that the nanosheets agglomerated when annealed at 300 ☌. The CCOH was annealed at various temperatures, and the structure changed to that of CCO at temperatures above 250 ☌. In this study, a copper–cobalt oxide nanosheet (CCO) electrode was synthesized by the electrodeposition of copper–cobalt hydroxide (CCOH) on Ni foam followed by annealing. Therefore, the study of OER catalysts, which are replaced by non-precious metals and have high activity and stability, are necessary. However, Ir- and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. The origin of the word Cobalt comes from the German word "Kobalt" or "Kobold," which translates as "goblin," "elf" or "evil spirit.Developing high performance, highly stable, and low-cost electrodes for the oxygen evolution reaction (OER) is challenging in water electrolysis technology. Co-60, a commercially important radioisotope, is useful as a radioactive tracer and gamma ray source. Cobalt is a ferromagnetic metal and is used primarily in the production of magnetic and high-strength superalloys. Cobalt produces brilliant blue pigments which have been used since ancient times to color paint and glass. Cobalt is found in cobaltite, erythrite, glaucodot and skutterudite ores. In its elemental form, cobalt has a lustrous gray appearance. Cobalt was first discovered by George Brandt in 1732. The cobalt atom has a radius of 125 pm and a Van der Waals radius of 192 pm. The number of electrons in each of cobalt's shells is 2, 8, 15, 2 and its electron configuration is 3d 7 4s 2. Cobalt (atomic symbol: Co, atomic number: 27) is a Block D, Group 9, Period 4 element with an atomic weight of 58.933195. Thin Film Deposition & Evaporation Materials.Additive Manufacturing & 3D Printing Materials.
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