Bifunctional Activity of PVP K‐30 Assisted Cobalt Molybdate for Electrocatalytic Water Splitting**

Abstract

Hydrogen fuel has emerged as pollution free renewable energy source and is a better substitute for carbon-based fossil fuels. Now it is a big challenge for research community to produce green efficient hydrogen fuel in order to fulfil the demand of our daily need. Water splitting process is a highly recognized way of hydrogen production and storage. The fabrication of efficient electrocatalyst is highly desirable for water splitting application. Structure directing groups play an unique role in controlling the size, and morphology of nanoparticles which ultimately affects the efficiency. Here we report a cost-effective CoMoO 4 electrocatalyst, which was synthesized by an easy chemical co-precipitation method in presence of organic polymeric surfactant K-30. It has a rod shape morphology. CoMoO 4 electrocatalyst exhibits high OER activity with low overpotential of 240 mV at 10 mA cm À 2 and low Tafel slope value, 75 mV/dec and stability of 10 h. The electrocatalyst also exhibits better HER activity with over potential of 224 mV at 10 mA cm À 2 and Tafel slope value of 104 mV/dec and stability of 8 h.

Advances in Functional Ceramics for Water Splitting: A Comprehensive Review

“…The introduction of rare earth elements into synthetic [Mn 4 CaO 4 ] n+ clusters, mimicking the oxygen-evolving center in photosynthesis, has shed light on the design of new water-splitting catalysts for artificial photosynthesis [104]. Furthermore, the adjustable electronic structure of transition metal molybdates between molybdenum, oxygen, and transition metals renders them active electrocatalysts for both the HER and OER [105]. The tunability of molybdates offers opportunities for optimizing the catalytic performance of water-splitting systems, contributing to the development of efficient and cost-effective electrolysis technologies.…”

Iron Nickel Sulfide Nanorods for Oxygen and Hydrogen Evolution Reaction

“…The water splitting process can replace the traditional fossil fuel-based technologies and meet the requirement of world's energy demand, that creates zero environmental pollution. [1][2][3][4] Thus, development of earth-abundant, non-precious, stable and efficient catalyst for electrolytic water-splitting is highly required. Over the past few years, various nanostructured metal oxides, hydroxides, layered double hydroxides, oxyhydroxides, sulfides, carbides, selenides, nitrides etc.…”

“…This electrochemical water splitting process is an effective approach of producing clean energy, especially H 2 gas. The water splitting process can replace the traditional fossil fuel‐based technologies and meet the requirement of world's energy demand, that creates zero environmental pollution [1–4] . Thus, development of earth‐abundant, non‐precious, stable and efficient catalyst for electrolytic water‐splitting is highly required.…”

Inducing Selenium Vacancy in Nickel Selenide/Iron Selenide by Hydrazine‐Ultrasonic Treatment for Electrocatalytic Water Splitting Reaction

“…Transition metals like Ni, Fe, Mo, Co have all these characteristics. [12][13][14][15] There are various type of transition metal-based oxide, phosphide, sulfide, and selenide materials that act as good electrocatalyst for water-splitting reaction. [16][17][18][19][20][21] But among them, selenide materials are well studied for electrolysis of water.…”

“…[12][13][14][15] There are various type of transition metal-based oxide, phosphide, sulfide, and selenide materials that act as good electrocatalyst for water-splitting reaction. [16][17][18][19][20][21] But among them, selenide materials are well studied for electrolysis of water. For instance, the amorphous NiFeSe hollow nanospheres show a very low overpotential of 85 mV at a current density of 10 mA cm À2 and 222 mV at a current density of 100 mA cm À2 for hydrogen evolution reaction and oxygen evolution reaction (OER), respectively.…”