Narrow Results

The effect of NiO contents on the microstructure of mesoporous NiO-Gd_0.25Ce_0.75O_2-x (NiO-GDC) composite for intermediate temperature solid oxide fuel cells (IT-SOFC) was investigated. Mesoporous NiO-GDC powders with different NiO contents were synthesized by self-assembly hydrothermal method using tri-block copolymer, Pluronic F127, as a structure directing agent. Grain growth/agglomeration behaviors of NiO particles and changes of mesoporous structure of GDC particles were characterized by microstructural analyses. NiO-GDC powders were composed of GDC nano particles with ordered mesopore inside the particles and octahedral NiO grains with truncated-edges. As the amount of NiO increases, specific area value of mesoporous NiO-GDC was decreased, and the agglomeration/growth behavior of NiO grains was accelerated.

Carbon nanotubes (CNTs) filled with metals can be used in capacitors, sensors, rechargeable batteries, and so on. Their interface significantly affects the properties of the composites. Here, we show that three kinds of interfaces between crystalline Ni and CNTs exist, namely, ordered, distorted, and disordered. They presented lattice states of Ni atoms near the interface, whereas the (111)_Ni plane was parallel to the CNTs' surface and appeared apart in a smaller or bigger angle. The coherent face-centered cubic (f.c.c)/hexagonal close-packed structure (h.c.p) boundary was formed between the crystalline Ni and CNTs at the ordered interface, in which the match was (111)_Ni//(0001)_Carbon. We suggested a dislocation model for the coherent interface. The model explained why the angle between (200)_Ni and the CNTs' inner surface was 52.9° rather than the theoretical value of 54.75°. The dislocation was formed to fit the coherent relationship. Thus, Ni lattice shrinkage occurred. Further study indicated that the formation mechanism of crystalline Ni in CNTs was through heterogeneous nucleation on the inner wall surface and growth of the crystal nucleus.

Three kinds of hierarchical CuS microflowers composed of thin nanosheets have been synthesized by a simple wet chemical method. It is shown that the CuS microflowers provide suitable substrates to grow nickel nanocrystals. The prepared Ni@CuS hybrids combined with conductive glass (FTO) have been used as counter electrodes for dye-sensitized solar cells (DSSCs). The electrode made of the active material of Ni@CuS microflowers with sparsest petals show an optimal photoelectric conversion efficiency of 4.89%, better than those made of single component of Ni (3.39%) or CuS (1.65%), and other two Ni@CuS composites. The improved performances could be ascribed to the synergetic effect of the catalytic effect towards I${}_3^{-}$/I${}^{-}$ from sparse CuS hierarchical structure and uniformly grown Ni nanocrystals. Besides, the introduced Ni nanocrystals could increase the conductivity of the hybrid and facilitate the transport of electrons. The hybrid Ni@CuS composites serving as counter electrodes have much enhanced electrochemical properties, which provide a feasible route to develop high-active non-noble hybrid counter electrode materials.

This work reports on the fundamental properties of nanostructured catalysts active in the main carbon oxides’ conversion processes for sustainable energy supply: methanation and co-methanation of CO₂. Transition metals (e.g. Ni, Pd, Pt, Co, Ru, Rh) are active species in both reactions. Ni has been the most studied because of its cheapness. Monometallic and bi-metallic Ni and Ni₃Fe catalysts supported on Gadolinia-doped ceria (GDC) have been synthesized, characterized and tested in the temperature range 200–600${}^{\circ }$C. In the methanation reaction, the monometallic catalyst showed higher performance with respect to the bi-metallic catalyst. At 400${}^{\circ }$C, the CO₂ conversion overcomes 90% with CH₄ selectivity of 100%. In co-methanation, the highest CO₂, CO and H₂ conversion values over monometallic Ni/GDC catalyst were obtained at 300${}^{\circ }$C; at higher temperatures, conversion decreases. The GDC support plays a pivotal role in both reactions, enhancing the basicity of the catalyst and improving the dissociation of carbon oxide species adsorbed on Ni sites.

The chapter deals with some important aspects of the relationship of lithium and nickel with the ecosystem, which consists mainly of soil, water, plants and air. Some aspects of lithium and nickel use in the energy industry are also mentioned. We begin by considering the fact that the metallic elements lithium and nickel, either alone or in the form of their chemical compounds, are currently considered potential energy materials whose applicability is increasing with the transition to the mass use of electricity and batteries for powering motor vehicles. Both lithium and nickel are commonly found in nature. Even in relatively low concentrations, their presence is very dangerous or even toxic to some animals and biological organisms. On the other hand, certain plants and animals are a natural part of ecosystems and are unable to survive with-out their presence because they are vital to them. This contradiction and its implications form the main content of this chapter. The most significant effects of lithium and nickel in the environment, particularly in soil, water and plant systems, are presented. The interconnectedness between soil, water and plants is shown in relation to each other. Some of the analytical methods used for the detection of lithium and nickel are also given. In addition, some specific results are presented, which are not intended to specify particular locations in the field, but rather to highlight the ability of researchers to monitor the presence of lithium and nickel in the environment and to create conditions for their removal and possible reuse.

Lithium (Li) and nickel (Ni) are two of the most widely used metals in various industrial applications. Since they are available for plants’ uptake from the soil, excessive plant exposure to high doses of both metals may be tolerable or not for accumulating species and sensitive species, respectively. Many plants adopt a number of powerful detoxification techniques in their fight for survival. Among them, the antioxidant defence system is a crucial mechanism that helps plants cope with toxic metals, including Li and Ni. Understanding the different approaches that plants use to activate this system can provide insights into how we can improve plant resilience and protect them from environmental stressors. Besides the natural endogenously reacting antioxidant system in the plant’s own body, exogenously applied antioxidants have proven to be effective in mitigating the negative effects of the aforementioned metals. Herein, we review the traditional as well as recent advances used in overcoming the toxicity of Li and Ni to plants.

Human-induced environmental pollution, which has emerged with the increasing population in recent years, has become a global threat. One of the consequences of its rapid and destructive effects is that heavy metals, such as lithium (Li) and nickel (Ni), threaten soil and plant health, and their presence in soil and water poses a risk to both human health and environmental well-being. The purpose of this chapter is to explore the importance of bioremediation in removing Li and Ni from soil and water by investigating various research studies and approaches. Bioremediation is a solution that utilises microorganisms to remove heavy metals by converting them into less toxic forms. Therefore, it is important to carefully select the appropriate microorganisms and optimise the bioremediation conditions to achieve the best results. Moreover, the effectiveness of these techniques depends on various factors, such as the concentration of Li or Ni in the soil, the duration of the remediation process and the environmental conditions.

A detailed knowledge and recent advancements on the sources, speciation, toxicity and chemistry of nickel and its different compounds are discussed in this chapter. Nickel is an essential micronutrient for plant growth, and it is also a component of the enzyme urease, which plays a role in nitrogen metabolism in higher plants. Nickel and nickel compounds are also important for several biological processes in animals and soil/water microbes, and they have many industrial and commercial uses. Nickel is a known heavy transition metal and is found at very low levels in the environment. The vast industrial use of nickel leads to widespread environmental pollution. Higher levels of nickel can affect the photosynthetic function and transpiration of higher plants; it reduces seed germination, root and shoot growth, biomass accumulation and final production. Moreover, nickel toxicity leads to chlorosis and necrosis and may cause oxidative damage in plants. In addition, nickel toxicity degrades soil fertility, which may reduce crop production in the near future. The limited knowledge regarding the mechanisms of nickel tolerance in plants further highlights this fact. Furthermore, it causes many chronic diseases in humans, including allergy, cardiovascular and kidney diseases, lung fibrosis and lung and nasal cancers. The molecular mechanisms of nickel-induced toxicity, which cause the above diseases in humans, are still unknown. Mitochondrial dysfunctions and oxidative stress are mainly considered to play a crucial role in inducing toxicity from this metal. Therefore, we should pay attention in future research to find approachable and prominent ways of minimising the entry of nickel into our environment.

The chapter summarises some essential features and findings related to the toxicities of lithium (Li) and nickel (Ni), which are always present in trace concentrations in food and the environment. These metal elements occur almost everywhere in nature, including in soils, rocks and the atmosphere. Therefore, due attention should be paid to their presence in various substances, including food, water and air. These materials can enter the human body through ingestion of food, drinking water and other routes, such as inhalation and skin penetration. The occurrence of Li/Ni in the environment has increased tremendously recently due to some human activities, especially specific technological processes, which have resulted in an increased presence of these elements in various products and goods. Recently, Li and Ni are gradually being used as main components in Li-ion and NiCd batteries. The first type of battery is mainly used in electric cars, while the less powerful NiCd batteries are primarily used in portable electronic devices and toys.

In addition, the chapter discusses the specific forms of toxicity of these metal elements and their occurrence in some foods. The processes and pathways by which these elements can enter the human organism are also described. They can have severely harmful effects at certain excessive concentrations and amounts. Because of these detrimental impacts, Li and Ni levels should be monitored to enable intervention when their presence exceeds regulatory limits or recommendations. Based on the results of such measurements, effective control mechanisms can then be implemented to minimise their effects on human health, including introducing appropriate measures to protect workers who come into contact with these elements in the workplace. This chapter also describes the actions necessary to regulate these elements’ presence and impose adequate controlling mechanisms and preparations, including those to respond effectively to possible emergencies.