Synthesis of palladium–carbon nanotube–metal organic framework composite and its application as electrocatalyst for hydrogen production

Abstract

There are very rare reports on using metal-organic framework (MOF) catalysts for electrochemical hydrogen production. In this study, a composite of palladium, single-walled carbon nanotube (SWCNT) and was synthesized by hydrothermal method, and its application as electrocatalyst in carbon paste electrode (CPE) structure for hydrogen production was studied. Scanning electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller and thermal gravimetric analysis were used to characterize Pd/ SWCNTs@MOF-199 catalyst. The performance of the proposed modified CPE for electrochemical hydrogen production was studied by cyclic voltammetry, linear sweep voltammetry, electrochemical impedance spectroscopy and chronoamperometry techniques. The effect of solution pH and the amount of binder and catalyst in the paste composition were investigated. The results showed that the CPE modified with Pd/SWCNTs@MOF-199 reveals better catalytic characteristics such as highest catalytic activity and lowest onset potential compared to CPE and CPE modified with MOF-199 for hydrogen production in aqueous solution.

An Insight on the Electrocatalytic Mechanistic Study of Pristine Ni MOF (BTC) in Alkaline Medium for Enhanced OER and UOR

“…[16,[32][33][34][35][36] In this regard, numerous MOFs or MOFs derived metal oxides are progressively studied for the application in Li-ion battery, supercapacitors and sensors. [16,[32][33][34][35][36] In this regard, numerous MOFs or MOFs derived metal oxides are progressively studied for the application in Li-ion battery, supercapacitors and sensors.…”

“…Metal-organic framework (MOFs) is an attractive and alternative way to tune the properties of materials by linking organic and inorganic units by strong bonds that lead to combined properties of high surface area, well defined pores, which can easily be tuned by the bridging ligands and metal connecting nodes and it provides well defined chemical structure as well as readily available active sites. [16,[32][33][34][35][36] In this regard, numerous MOFs or MOFs derived metal oxides are progressively studied for the application in Li-ion battery, supercapacitors and sensors. [37][38][39] In the field of catalysis, numerous studies have been carried out to showcase the effective catalytic characteristics of MOF.…”

Metal–Organic Frameworks and Their Composites: Synthesis and Electrochemical Applications

“…By varying metal ions/organic linkers, along with the original versatile characters of MOFs including high surface area, controllable structure, ordered, meso‐ or microporous, and tunable pore, the specific characteristics of functional MOFs can be fully brought into many applications in the area of electrochemistry, such as LIBs and Li–S batteries, supercapacitor, proton conductor, electrocatalysis (HER, ORR, small organic molecules, or pollution molecules), electrochemical sensor. First, many efforts have been made to improve the conductivity of MOFs by a variety of methods, such as adopting metal center or mixed metal units with redox activity or organic linkers with reactive activity for pristine MOFs or fabricating MOF composites containing various conductive materials@MOF, such as metal, metal oxide, different carbon materials, LDH sheet, or conductive plates. Besides, MOF composites can be also fab...…”

“…Nevertheless, most transition metals are unstable in acid media due to their corrosion. In this regard, the MOF@C composite is fabricated with various carbon materials (e.g., graphene, CNTs, carbon black, and hollow or porous carbon) or some polymeric materials (e.g., polyaniline (PANI) and polypyrrole) adopted into MOFs . This C family has been studied for the electrode and catalyst supports ascribed to their high specific surface area, high conductivity, and effective charge transfer at the electrodes.…”

“…The functional surface area and high porosities of MOFs play crucial role in many functional properties including proton conduction, supercapacitors, and Li‐based batteries. Furthermore, the development of MOF composites by introducing new electrochemical materials into pristine MOFs enhances the MOF conductivity and boosts the electrochemical applications of MOFs. The implantation of functional materials into the MOF pores further broadens the applications of MOFs and improves the cycling performance.…”