Facile deposition of palladium oxide (PdO) nanoparticles on CoNi₂S₄ microstructures towards enhanced oxygen evolution reaction

Abstract

Strong demand for renewable energy resources and clean environments have inspired scientists and researchers across the globe to carry out research activities on energy provision and conversion, as well as storage devices. In this context, development of outperform, stable, and durable electrocatalysts has been identified as one of the major objectives for oxygen evolution reaction (OER) at low overpotential. Herein, we offer facile approach for the deposition of few palladium oxide (PdO) nanoparticles on the cobalt-nickel bi-metallic sulphide (CoNi2S4) microstructures as PdO@ CoNi2S4 using ultraviolet light irradiation. The morphology, crystalline structure, and chemical composition of the as-prepared PdO@ CoNi2S4 composite were probed through scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), high resolution transmission electron microscopy (HR-TEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) techniques. The combined results revealed that UV light promoted the facile deposition of PdO nanoparticles of 10 nm size onto the CoNi2S4 and the fabricated PdO@ CoNi2S4 composite has remarkable activity towards OER in alkaline media. Significantly, it has shown a low onset potential of 1.41 V versus reversible hydrogen electrode (RHE) and a low overpotential of 230 mV at 10 mAcm-2. Additionally, the PdO@ CoNi2S4 composite was found stable for 45 h. Electrochemical impedance spectroscopy (EIS) has shown that the PdO@ CoNi2S4 composite has a low charge transfer resistance of 86.3 Ohms, which favors the OER kinetics. The PdO@ CoNi2S4 composite provided the multiple number of active sites, which favoured the enhanced OER activity. This new class of material could be investigated towards potential applications in overall water splitting, energy storage and conversion applications.

Synthesis and characterization of lead-based metal–organic framework nano-needles for effective water splitting application

“…Over the past ten years, researchers have explored the potential of non-precious electrocatalysts that utilize transition metals such as nickel, cobalt, and copper, as well as their respective oxides, for the purpose of water-splitting. This has been documented in various studies [41][42][43][44] . One of the possible candidates is lead (Pb), which is a widely available and low-cost metal with high electrical conductivity and chemical stability 44 .…”

“…Considerable resources have been dedicated to the pursuit of efficient electrocatalysts, prompting the development of novel methodologies for studying material properties and the underlying mechanisms of the oxygen evolution reaction (OER) 41 . Recently, knowledge not only serves as the basis for understanding the functioning of the OER mechanism, but also highlights the essential factors that contribute to the efficacy of an electrocatalyst, as evidenced by numerous research investigations 42 , 43 .…”

An advanced PdNPs@MoS2 nanocomposite for efficient oxygen evolution reaction in alkaline media

“…5d. As described in previous studies, 38,40,54 the slope obtained after linear fitting corresponds to the ECSA value. In order, sample-2, sample-1, palladium nanoparticles, and pristine MoS 2 have ECSA values of 20.5, 11, 3.8, and 3.6 μF cm −2 respectively.…”

“…As a result, additional photogenerated electrons were generated and more Pd 2+ ions were converted into Pd 0 , growing on the Pd precursors to form giant Pd nanoparticles. [37][38][39][40] Hence, MoS 2 nanostructures were combined with Pd nanoparticles. Following the combination process, samples were removed from UV irradiation boxes and repeatedly washed with DI water.…”

MnO2@Co3O4 nanocomposite based electrocatalyst for effective oxygen evolution reaction

“…Growing energy consumption and the depletion of fossil fuels are two major challenges which have led to the discovery of earth abundant alternative sources and the development of effective energy storage systems [1][2][3]. For this fact, electrochemical water electrolysis is one of the most efficient methods to obtain hydrogen [4,5].…”