Nano-nickel catalytic dehydrogenation of ammonia borane

Abstract

The complex chemical hydride, ammonia borane (NH 3 BH 3 , AB) is a hydrogen rich compound. It is a promising hydrogen source for applications using proton exchange membrane fuel cells (PEMFCs) due to hydrogen content. It has reasonably lower operating temperatures compared with other solid-state hydriding materials. At present, AB is an expensive disposable source which in its pure form releases 1 mol of hydrogen at around 110°C. This temperature is much higher than the operating temperature of PEMFC (*80°C). At the operating temperatures of the fuel cell, the slow kinetics of pure AB is a deterrent which provides enough scope for experimentation. The paper is the result of experimental thermolysis effort by using nano-nickel as a catalyst with pure AB. The neat and catalyzed AB isothermal decomposition and kinetic behavior are illustrated through the experimental results obtained under various conditions. The focus of experimentation is to increase the rate and extent of release of hydrogen at lower temperatures. The experimental results indicated that the use of nickel as catalyst reduced the induction period with significant improvement in hydrogen release compared with neat AB.

Spray pyrolysed thin films of copper antimony sulfide as photovoltaic absorber

“…Article the respective plot to α = 0, as shown in the figure. This value agrees with reported value of 1.5 eV earlier reports on optical properties of CuSbS 2 , both theoretical [2,5] and experimental values [1,7,12]. Figure 7 shows the results of the photocurrent response measurements on samples A, B and C at room temperature by applying a dc bias of 5 V. All the films were photoconductive.…”

“…Theoretical studies show that CuSbS 2 absorption strength beyond the band edge is even higher than that of CuInSe 2 due to their sharp p-like conduction band maximum (CBM) [2]. Recently accelerated research growth has been done on various aspects of this material both theoretical as well as experimental approach [1,[3][4][5][6][7][8][9][10][11]. Exploration of this material for photovoltaic applications have been reported [1,12,13] with maximum conversion efficiencies up to 3% [9] so far.…”

Fabrication and characterization of eco‐friendly human‐hair derived porous carbon‐filled carbon fabric‐reinforced polymer composites

“…Another absorption peak at 1,443 cm −1 moved to 1,375 cm −1 may be assigned to C-OH bond stretching. The peak shift observed may be due to the increase of heat treatment temperature [29,30]. A clear absorption peak at 1,655 cm −1 migrated to 1,560 cm −1 may be attributed due to the stretching of C=O or C=C bonds and the shift in peak position may be due to the increment in T c .…”

“…Therefore, the researchers are working hard to find alternate carbon fillers that can be obtained from abundantly available natural organic resources having low density and also compatible to the polymer matrix. More recently they have been obtained in various forms of nanostructured carbon (CNTs, graphene, fullerenes, etc) from various forms of organic/ biomass wastes such as agricultural wastes, wood wastes, food wastes, silk waste, animal bones, poultry feather, plants leaves extracts and also from waste human hair that are available naturally at almost no cost [27][28][29][30].…”

Improved Sorption‐Enhanced Steam Methane Reforming via Calcium Oxide–Based Sorbents with Targeted Morphology

“…[17] Indeed, highly active, efficient, and inexpensive adsorbents are critical for the widespread implementation of SE-SMR technology. [18] Current research efforts to improve the utilization and durability of CaO-based sorbents include i) the synthesis of calciumbased sorbents from organic and inorganic precursors (instead of naturally derived CaO sources); [19] ii) doping CaO with various metals; [20,21] and iii) post-treating the sorbents in an attempt to increase their lifespan. [22] Studies by Martavaltzi et al [23,24] on mixtures of mayenite, Ca 12 Al 14 O 33 , and CaO show that aluminum is an attractive additive to improve the stability of calcium oxides, albeit at the expense of the sorption capacity.…”