The authors regret that there was an error in the Conclusions section of their article. The sentence ‘Hydrogen is generated at as high rate as 720 mL/min or 32 mmol/min for 0.5 mg of Al salt at room temperature.’ should be: “Hydrogen is generated at as high rate as 720 mL/min or 32 mmol/min for 0.5 g of Al salt at room temperature.” The authors would like to apologise for any inconvenience caused. © 2018 Hydrogen Energy Publications LLC

Edamana Prasad

Department Of Chemistry

Tiju Thomas

Department of Metallurgical and Materials Engineering

Abdul Malek

Subrahmanyam Aryasomayajula

Fulltext

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

International Journal of Hydrogen Energy

Copper contamination is a serious ecological and human health hazard. Therefore, a multifunctional/synergistic process, which sequesters Cu2+ while also providing additional functionalities (say a high-value nanoparticle and an energy source as byproducts) would be relevant. On the other hand, although several sophisticated methods have been utilized for the synthesis of Al nanoparticles (NPs); simple chemical synthesis of Al NPs, particularly in water, has not been explored due to its instability in the aqueous medium. In this work, a coreduction based sequestration of Cu2+ (aq) is demonstrated where Al3+(aq) and Cu2+(aq) are coreduced in copper-contaminated water. The outcome of the process is the formation of stable Al(0) nanoparticles and simultaneous sequestration of Cu2+(aq); this occurs along with production of hydrogen gas as a byproduct. Nanoparticle stability is likely due to the Cu coating on Al nanoparticles, resulting in the formation of Al(0)@Cu NPs. Hydrogen is produced as a byproduct at a rate of 550 mL/min per 0.5 g of both Al3+ and Cu2+ salts, leading to three benefits (stable Al(0)@Cu NPs formation, Cu2+ sequestration, and hydrogen production) from a single approach. © 2019 American Chemical Society.

ACS Sustainable Chemistry and Engineering

Synthesis of Stable Al(0) Nanoparticles in Water in the form of Al(0)@Cu and Sequestration of Cu2+(aq) with Simultaneous H2 Production

Reaction of Al metal with water is a well-known technique for large scale production of hydrogen. However, this method suffers from kinetic limitations due to formation of a passivation layer on Al, preventing optimal operations. Using high resolution Scanning Kelvin Probe Force Microscopy (SKPFM), we show the origin of formation of ‘nano-galvanic couple’ on in situ formed nano-aluminum amalgam surfaces in a water splitting system; passivation based limitations are completely bypassed in this approach. Furthermore, they offer an opportunity to beneficiate and recover mercury in contaminated water. The nano-galvanic corrosion due to substantial lateral variation in surface contact potential is responsible for the observed high throughput of hydrogen production (720 mL/min per 0.5 g Al salt). It may be noted that this process fares better than in situ prepared nano-Al based hydrogen production, wherein 600 mL/min of hydrogen is obtained for 0.5 g Al salt. Investigations using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS) provide evidence for passivation-bypassed hydrolysis and favourable kinetics for in situ derived nano-AlHg hydrolytic agents (when compared to nano-Al). This study, to the best of our knowledge, reports the first direct proof of nano-galvanic couple formation on in-situ prepared nanoaluminum amalgam surface; paving a direct way to overcome the long standing passivation problem in Al hydrolysis. It is found that the hydrogen production rate and standard deviation (SD) of the contact potential of nanoaluminum amalgam are directly related to the rate of addition of the reducing agent, offering an opportunity for kinetic control for the in situ hydrolytic process. © 2018 Hydrogen Energy Publications LLC

Evidence of nano-galvanic couple formation on in-situ formed nano-aluminum amalgam surfaces for passivation-bypassed water splitting

Corrigendum to “Chimie douce hydrogen production from Hg contaminated water, with desirable throughput, and simultaneous Hg-removal” [Int J Hydrogen Energy 42 (2017) 15724–15730] (S0360319917319523) (10.1016/j.ijhydene.2017.05.082))

Journal	Data powered by TypesetInternational Journal of Hydrogen Energy
Publisher	Data powered by TypesetElsevier Ltd
Open Access	No