A spontaneous hydrogen fuel purifier under truly ambient weather conditions

Mondal, Ritwik; Thimmappa, Ravikumar; Nayak, Bhojkumar; Dewan, Anweshi; Devendrachari, Mruthunjayachari Chattanahalli; Chen, Qingsong; Wen, Zhenhai; Thotiyl, Musthafa Ottakam

doi:10.1039/d3ee02095a

Cited by 4 publications

(1 citation statement)

References 55 publications

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“…Hydrogen generation is constrained by the high overpotential and low chemical stability of existing catalysts for water electrolysis. , Researchers have previously explored earth-abundant and stable transition metals as catalysts, such as (Fe, Co, Ni)-oxides, -nitrides, and -carbides, but their efficiency is constrained by poor intrinsic conductivity. Moreover, to optimize the catalytic performance of 3d-transition metal particles, durable, conductive, and anticorrosive supports such as carbon cages, nanotubes, or nanorods need to be developed .…”

Section: Introductionmentioning

confidence: 99%

Nickel-Embedded Carbon Nanostructures as Noble Metal-Free Catalysts for the Hydrogen Evolution Reaction

Kumar,

Goyal

et al. 2024

ACS Appl. Nano Mater.

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We demonstrate the electrocatalytic activity of "nitrogen (N)-doped porous carbon matrix embedded with nickel nanoparticles" for efficient hydrogen evolution reaction (HER) in alkaline medium. Three samples were synthesized via pyrolysis of a fixed amount (500 mg) of Ni(acac) 2 , along with three different amounts of nitrogen precursor melamine (100, 250, and 500 mg) separately. The varying nitrogen concentrations of the surrounding carbon layers on the Ni nanoparticles enhance the surface area and porosity, exposing extensive active sites for catalytic reactions. The transition metal-based catalysts are crucial for long-term sustainability due to their combined edge (effectiveness and inexpensiveness) over traditional catalysts. Thus, by employing the protective carbon layer on the transition metal nanoparticles, we fabricated a catalyst that exhibits outstanding performance, with a low overpotential of 45.6 mV at 10 mA cm −2 in 1 M KOH and maintains it for 24 h (durability), highlighting its exceptional catalytic efficacy and stability. The pores in carbon nanostructures facilitate the ionic moieties to move to active sites inside the pores. As the pore size variation influences the movement of charge or diffusion, this is reflected in the magnitude of impedance (|Z| imp ). Consequently, the enhanced number of active sites along with the larger pore sizes resulting from optimum amounts of nitrogen doping enables the sample with minimal |Z| imp and an enhanced HER performance. The present study demonstrates the way to design a sustainable, extremely effective, and inexpensive HER electrocatalyst.

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