ItemArticle

2--Intercalated NiCo-Layered Double Hydroxide Nanospikes: An Efficiently Synergized Material for Urine to Direct H2 Generation

Title
2--Intercalated NiCo-Layered Double Hydroxide Nanospikes: An Efficiently Synergized Material for Urine to Direct H2 Generation
Creator
Nadeema A.; Kashyap V.; Gururaj R.; Kurungot S.
Description
Substituting the energy-uphill water oxidation half-cell with readily oxidizable urea-rich urine, a ground-breaking bridge is constructed, combining the energy-efficient hydrogen generation and environmental protection. Hence, designing a robust multifunctional electrocatalyst is desirable for widespread implementation of this waste to fuel technology. In this context, here, we report a simple tuning of the electrocatalytically favorable characteristics of NiCo-layered double hydroxide by introducing [MoS4]2- in its interlayer space. The [MoS4]2- insertion as well as its effect on the electronic structure tuning is thoroughly studied via X-ray photoelectron spectroscopy in combination with electrochemical analysis. This insertion induces overall electronic structure tuning of the hydroxide layer in such a way that the designed catalyst exhibited favorable kinetics toward all the required reactions of hydrogen generation. This is why our homemade catalyst, when utilized both as a cathode and anode to fabricate a urea electrolyzer, required a mere .37 V cell potential to generate sufficient H2 by reaching the benchmark 10 mA cm-2 in 1 M KOH/0.33 M urea along with long-lasting catalytic efficiency. Other indispensable reason of selecting [MoS4]2- is its high-valent nature making the catalyst highly selective and insensitive to common catalyst-poisoning toxins of urine. This is experimentally supported by performing the real urine electrolysis, where the nanospike-covered Ni foam-based catalyst showed a performance similar to that of synthetic urea, offering its industrial value. Other intuition of selecting [MoS4]2- was to provide a ligand-based mechanism for hydrogen evolution half-cell [hydrogen evolution reaction (HER)] to preclude the HER-competing oxygen reduction. Another crucial point of our work is its potential to avoid the mixing of two explosive product gases, that is, H2 and O2. 2019 American Chemical Society.
Source
ACS Applied Materials and Interfaces, Vol-11, No. 29, pp. 25917-25927.
Date
2019-01-01
Publisher
American Chemical Society
Subject
hydrogen evolution reaction; layered double hydroxide; nickel oxyhydroxide; sewage denitrification; urea oxidation reaction; urine/urea electrolysis
Coverage
Nadeema A., Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110001, India; Kashyap V., Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110001, India; Gururaj R., Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India, Christ University, Bengaluru, 560029, India; Kurungot S., Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110001, India
Rights
Restricted Access
Relation
ISSN: 19448244; PubMed ID: 31243949
Format
Online
Language
English
Type
Article

Collection

Articles

Citation

Nadeema A.; Kashyap V.; Gururaj R.; Kurungot S., “2--Intercalated NiCo-Layered Double Hydroxide Nanospikes: An Efficiently Synergized Material for Urine to Direct H2 Generation,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 22, 2025, https://archives.christuniversity.in/items/show/16650.

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