02878nas a2200253   4500008004100000022001400041245014000055210006900195260000900264300001600273490000700289520193800296653003202234653002902266653002402295653002702319653002802346653002802374100002002402700002402422700002302446700002402469856013102493       2019                        eng d  a1944-824400a[MoS4](2-)-Intercalated NiCo-layered double hydroxide nanospikes: an efficiently synergized material for urine to direct H-2 generation0 aMoS42Intercalated NiColayered double hydroxide nanospikes an eff  cJUL   a25917-259270 v113 a<p>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 6 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]' 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 X1.37 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 O-2.</p>
10ahydrogen evolution reaction10aLayered double hydroxide10anickel oxyhydroxide10asewage denitrification10aurea oxidation reaction10aurine/urea electrolysis1 aNadeema, Ayasha1 aKashyap, Varchaswal1 aGururaj, Rakshitha1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/mos42-intercalated-nico-layered-double-hydroxide-nanospikes-efficiently-synergized-material02194nas a2200241   4500008004100000022001400041245016800055210006900223260000800292300001400300490000600314520127100320653002201591653002401613653002601637653003201663653003001695100002001725700003001745700002701775700002401802856012601826       2020                        eng d  a2196-021600aCo@CoAl-layered double hydroxide/nitrogen-doped graphene composite catalyst for Al-H2O-based batteries: simultaneous hydrogen production and electricity generation0 aCoCoAllayered double hydroxidenitrogendoped graphene composite c  cJUN  a2582-25910 v73 a<p>Currently, the low energy efficiency of water electrolysis has compelled research toward the development of novel and energy-effective strategies for low-cost H-2 generation. In this context, we report a new concept of simultaneous H-2 and electricity generation by separating out the exothermic self-sustained Al-H2O reaction via electrochemistry. In addition, to catalyze the cathodic water reduction reaction, a single-pot and environmentally benign synthesis method is adopted. It results in the design of an electrocatalyst composed of Co@CoAl-layered double hydroxide core-shell nanospheres anchored over in situ generated N-doped graphene. Toward the water reduction reaction, the designed catalyst shows a negative voltage shift of mere around 113 mV with respect to the commercial Pt/C catalyst to reach the benchmark 10 mA cm(-2), with excellent stability of approximately 86 % voltage retention after 12 h of continuous operation. The catalytic superiority of our material is evident when taken for battery-level testing; the fabricated device was able to deliver an average output voltage of around 0.95 V at a discharge current density of 5 mA cm(-2) along with H-2 liberation, which was also detected and quantified through gas chromatography.</p>
10aAl-H2O fuel cells10achronopotentiometry10acore-shell structures10ahydrogen evolution reaction10alayered double hydroxides1 aNadeema, Ayasha1 aKharabe, Geeta, Pandurang1 aBiswal, Dibya, Prakash1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/cocoal-layered-double-hydroxidenitrogen-doped-graphene-composite-catalyst-al-h2o-based