Exceptional co-catalysts free SrTiO3 perovskite coupled CdSe nanohybrid catalyst by green pulsed laser ablation for electrochemical hydrogen evolution reaction

Mohamed, Mohamed Jaffer Sadiq; Gondal, M.A.; Hassan, Muhammad; Khan, Abdul Zeeshan; Surrati, Aroob Mohammed Ibrahim; Almessiere, M.A.

doi:10.1016/j.ceja.2022.100344

Cited by 18 publications

(8 citation statements)

References 46 publications

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“…The samples’ electrochemical double-layer capacitance ( C dl ) in KOH solution (1.0 M) was determined by scanning CV in the scan speed range of 20–120 mV/s in the non-Faradaic region. ECSA = C dl / C s values were evaluated in specific capacitance ( C s of mean value 35 μF/cm 2 ) . Chronopotentiometry measurements were used to examine the stability and durability of the proposed catalysts at 10 mA/cm 2 .…”

Section: Methodsmentioning

confidence: 99%

“…ECSA = C dl /C s values were evaluated in specific capacitance (C s of mean value 35 μF/cm 2 ). 42 Chronopotentiometry measurements were used to examine the stability and durability of the proposed catalysts at 10 mA/cm 2 . In addition, the cycling performance of the proposed electrode was evaluated by repeating LSV for 1000 cycles to measure the catalyst performance.…”

Section: ■ Introductionmentioning

confidence: 99%

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Effective Hydrogen Production from Alkaline and Natural Seawater using WO₃_–x@CdS_1–x Nanocomposite-Based Electrocatalysts

Mohamed,

Gondal,

Hassan

et al. 2023

ACS Omega

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Offshore hydrogen production through water electrolysis presents significant technical and economic challenges. Achieving an efficient hydrogen evolution reaction (HER) in alkaline and natural seawater environments remains daunting due to the sluggish kinetics of water dissociation. To address this issue, we synthesized electrocatalytic WO 3−x @ CdS 1−x nanocomposites (WCSNCs) using ultrasonic-assisted laser irradiation. The synthesized WCSNCs with varying CdS contents were thoroughly characterized to investigate their structural, morphological, and electrochemical properties. Among the samples tested, the WCSNCs with 20 wt % CdS 1−x in WO 3−x (W x @S x -20%) exhibited superior electrocatalytic performance for hydrogen evolution in a 1 M KOH solution. Specifically, the W x @S x -20% catalyst demonstrated an overpotential of 0.191 V at a current density of −10 mA/cm 2 and a Tafel slope of 61.9 mV/dec. The W x @S x -20% catalysts demonstrated outstanding stability and durability, maintaining their performance after 24 h and up to 1000 CV cycles. Notably, when subjected to natural seawater electrolysis, the W x @S x -20% catalysts outperformed in terms of electrocatalytic HER activity and stability. The remarkable performance enhancement of the prepared electrocatalyst can be attributed to the combined effect of sulfur vacancies in CdS 1−x and oxygen vacancies in WO 3−x . These vacancies promote the electrochemically active surface area, enhance the rate of charge separation and transfer, increase the number of electrocatalytic active sites, and accelerate the HER process in alkaline and natural seawater environments.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Effective Hydrogen Production from Alkaline and Natural Seawater using WO₃_–x@CdS_1–x Nanocomposite-Based Electrocatalysts

Mohamed,

Gondal,

Hassan

et al. 2023

ACS Omega

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“…3 In this system, hydrogen evolution reaction (HER) takes place at the cathode, and the oxygen evolution reaction (OER) occurs at the anode. 4 For both HER and OER, a suitable catalyst with low-cost, ease of preparation, excellent electrochemical activity, natural abundance, and long-term stability for both HER and OER 5 is important for electrochemical water splitting. 6 Although Pt-based and Ru/Ir materials have high cost, low abundance, and poor stability under harsh conditions, they are extensively used for HER and OER, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In this system, hydrogen evolution reaction (HER) takes place at the cathode, and the oxygen evolution reaction (OER) occurs at the anode . For both HER and OER, a suitable catalyst with low-cost, ease of preparation, excellent electrochemical activity, natural abundance, and long-term stability for both HER and OER is important for electrochemical water splitting …”

Section: Introductionmentioning

confidence: 99%

Chestnut-like Molybdenum-Doped Nickel Cobaltite Spinel Oxide Nanoparticles Grown on Ni Foam as the Electrocatalyst for the Hydrogen Evolution Reaction

Alkhaldi,

Gondal,

Mohamed

et al. 2024

ACS Appl. Nano Mater.

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The 3D NiMo x Co 2−x O 4 (x ≤ 0.06) chestnut-like spinel oxide nanoparticles (CNSPs) grown on Ni foam were effectively prepared hydrothermally. The formation of Ni−Co CNSPs was confirmed by the XRD powder pattern, which exhibited a pure cubic spinel oxide structure without undesired phases. All ratios revealed a broadened peak representing a small crystal size (12.8−17.5 nm) range. The chestnut-like CNSPs were presented by FE-SEM, SEM, TEM, and HR-TEM analysis. The chemical composition of the products was confirmed by EDX. The 3D NiMo x Co 2−x O 4 (x = 0.04) CNSP electrocatalyst exhibited hydrogen evolution reaction (HER) activity as evidenced by 0.224 V overpotential, Tafel slope 61.9 mV/dec, and high stability for 36 h of chronopotentiometry techniques. The surface and electrochemical characterization revealed that 4.0% Mo-doped exhibits improved HER activity due to significantly higher electrochemical surface area and accelerated charge-transfer kinetics at the semiconductor electrolyte interface. Density functional theory is employed to investigate the impact of Mo dopants on the HER performance. This study shows how both hydrogen and water molecules adhere to the surface of Mo-doped NiCo 2 O 4 slab structures. The findings indicate that introducing Mo dopants leads to an augmentation of chemical activity through water adsorption, resulting in an enhanced electrocatalytic process and improved HER activity up to a specific Mo concentration, and their impact on spin-dependent electronic structure characteristics is revealed by the density of states spectra. This work not only gives insights into low-metal-cost materials for efficient and durable HER electrocatalysts, but it also provides a successful showcase model catalyst for in-depth mechanistic insights into electrochemical HER processes and their industrial applications in the future.

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“…EWS (electrochemical water splitting) is a favorable methodology for hydrogen production 17 , 18 . To promote the development of hydrogen gas as fuel, a suitable catalyst with low-cost, natural abundance, excellent electrochemical activity, ease of preparation, and long-term stability for both HER 19 , 20 and OER (oxygen evolution reaction) will be employed be employed be critical for electrochemical water splitting 21 .…”

Section: Introductionmentioning

confidence: 99%

Role of vanadium ions substitution on spinel MnCo2O4 towards enhanced electrocatalytic activity for hydrogen generation

Mohamed

Slimani

Gondal

et al. 2023

Sci Rep

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Improving efficient electrocatalysts (ECs) for hydrogen generation through water splitting is of significant interest in tackling the upcoming energy crisis. Sustainable hydrogen generation is the primary prerequisite to realizing the future hydrogen economy. This work examines the electrocatalytic activity of hydrothermally prepared vanadium doped MnCo spinel oxide microspheres (MC), MnVxCo2−xO4 (Vx-MnCo MC, where x ≤ 0.4) in the HER (hydrogen evolution reaction) process. Magnetization measurements demonstrated a paramagnetic (at high temperatures) to a ferrimagnetic (at low temperatures) transition below the Curie temperature (Tc) in all the samples. The magnetization is found to intensify with the rising vanadium content of MCs. The optimized catalyst Vx-MnCo MCs (x = 0.3) outperformed other prepared ECs with a Tafel slope of 84 mV/dec, a low onset potential of 78.9 mV, and a low overpotential of 85.9 mV at a current density of 10 mA/cm2, respectively. The significantly improved HER performance of hydrothermally synthesized Vx-MnCo MCs (x = 0.3) is principally attributable to many exposed active sites, accelerated electron transport at the EC/electrolyte interface, and remarkable electron spectroscopy for chemical analysis (ECSA) value was found ~ 11.4 cm2. Moreover, the Vx-MnCo MCs (x = 0.3) electrode exhibited outstanding electrocatalytic stability after exposure to 1000 cyclic voltametric cycles and 36 h of chronoamperometric testing. Our results suggest a feasible route for developing earth-abundant transition metal oxide-based EC as a superior electrode for future water electrolysis applications.

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Exceptional co-catalysts free SrTiO3 perovskite coupled CdSe nanohybrid catalyst by green pulsed laser ablation for electrochemical hydrogen evolution reaction

Cited by 18 publications

References 46 publications

Effective Hydrogen Production from Alkaline and Natural Seawater using WO₃_–x@CdS_1–x Nanocomposite-Based Electrocatalysts

Effective Hydrogen Production from Alkaline and Natural Seawater using WO₃_–x@CdS_1–x Nanocomposite-Based Electrocatalysts

Chestnut-like Molybdenum-Doped Nickel Cobaltite Spinel Oxide Nanoparticles Grown on Ni Foam as the Electrocatalyst for the Hydrogen Evolution Reaction

Role of vanadium ions substitution on spinel MnCo2O4 towards enhanced electrocatalytic activity for hydrogen generation

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Exceptional co-catalysts free SrTiO3 perovskite coupled CdSe nanohybrid catalyst by green pulsed laser ablation for electrochemical hydrogen evolution reaction

Cited by 18 publications

References 46 publications

Effective Hydrogen Production from Alkaline and Natural Seawater using WO3–x@CdS1–x Nanocomposite-Based Electrocatalysts

Effective Hydrogen Production from Alkaline and Natural Seawater using WO3–x@CdS1–x Nanocomposite-Based Electrocatalysts

Chestnut-like Molybdenum-Doped Nickel Cobaltite Spinel Oxide Nanoparticles Grown on Ni Foam as the Electrocatalyst for the Hydrogen Evolution Reaction

Role of vanadium ions substitution on spinel MnCo2O4 towards enhanced electrocatalytic activity for hydrogen generation

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Product

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Effective Hydrogen Production from Alkaline and Natural Seawater using WO₃_–x@CdS_1–x Nanocomposite-Based Electrocatalysts

Effective Hydrogen Production from Alkaline and Natural Seawater using WO₃_–x@CdS_1–x Nanocomposite-Based Electrocatalysts