journal article
Open Access Collection
Home
Goswami, Nidhi; Naithani, Sudhanshu; Mangalam, Jimmy; Goswami, Tapas; Dubey, Ritesh; Kumar, Pramod; Kumar, Pankaj; Kumar, Sushil
doi: 10.1039/d3dt01723kpmid: 37750386
Group 10 metals including Ni, Pd and Pt have been extensively applied in various essential aspects of human social life, material science, industrial manufactures, medicines and biology. The ionic forms of these metals are involved in several biologically important processes due to their strong binding capability towards different biomolecules. However, the mishandling or overuse of such metals has been linked to serious contamination of our ecological system, more specifically in soil and water bodies with acute consequences. Therefore, the detection of group 10 metal ions in biological as well as environmental samples is of huge significance from the human health point of view. Related to this, considerable efforts are underway to develop adequately efficient and facile methods to achieve their selective detection. Optical sensing of metal ions has gained increasing attention of researchers, particularly in the environmental and biological settings. Innovatively designed optical probes (fluorescent or colorimetric) are usually comprised of three basic components: an explicitly tailored receptor unit, a signalling unit and a clearly defined reporter unit. This review deals with the recent progress in the design and fabrication of fluorescent or colorimetric organic sensors for the detection of group 10 metal ions (Ni(ii), Pd(ii) and Pt(ii)), with attention to the general aspects for design of such sensors.
doi: 10.1039/d3dt02518gpmid: 37807856
Hydrogen peroxide (H2O2) possesses both strong oxidizing and moderate reducing ability. Due to the unique chemical reactivity, one-compartmentalization of fuel cells is possible by using H2O2 as both the fuel and oxidant for fuel cells (H2O2-FC). To enhance the anode reaction (H2O2 → O2 + 2H+ + 2e−) of the H2O2-FC, a noble metal-free H2O2-photo fuel cell (PFC) has been newly developed for enhancing the conversion from chemical energy to electric energy with only emission of water and oxygen. The H2O2-photo fuel cells (PFC) take several significant advantages over the conventional hydrogen-oxygen fuel cells. With the realization of a solar-driven energy cycle with H2O2 as the key substance in mind, this Frontier article highlights the H2O2-PFCs. Firstly, the fundamentals of the H2O2-PFC are dealt with by treating the prototype using TiO2 as the photoanode. Then, recent progress in the H2O2-PFCs and an emerging application to self-powered biosensors are described. Finally, the conclusions are summarized with the future outlook.
Geng, Zi-Long; Tang, Hong-Xin; Fu, Rui-Biao; Ma, Zu-Ju; Wu, Xin-Tao
doi: 10.1039/d3dt03071gpmid: 37823276
A new beryllium-free deep-UV transparent NLO crystal Li(H2O)2Sc(SO4)2 features a two-dimensional [Sc(SO4)2] framework consisting of twisted [Sc3S4O9] units decorated by [LiO2(H2O)2] groups into a unique layer. Remarkably, Li(H2O)2Sc(SO4)2 exhibits a phase-matching SHG response of 0.7 × KDP and a deep-UV cutoff edge below 190 nm.
Chen, Xue; Chen, Biyi; Li, Dan; Li, Longhua; Xu, Dongbo; Shi, Weidong
doi: 10.1039/d3dt02120cpmid: 37814527
Indium (In) ions were diffused into a TiO2 (In-TiO2) photoelectrode via a facile and efficient flame doping method resulting in improved photo-induced carrier separation. The dopant concentration was systematically investigated, and a volcano-type relationship between the dopant concentration and photoelectrochemical (PEC) performance was observed. The optimum incident photon-to-current efficiency and photocurrent density of In-TiO2 were 38.6% and 0.70 mA cm−2 at 1.23 V, respectively, 2.1 and 11.2 times the values of pristine TiO2, respectively. In doping resulted in improved charge separation and lower surface adsorption energies for reactant molecules, as evidenced by experimental and computational methods.
Dahiya, Pardeep; Garg, Nidhi; Poli, Rinaldo; Sundararaju, Basker
doi: 10.1039/d3dt03161fpmid: 37814805
To realize the goal of a carbon-free energy economy, it is crucial to discover reactions that utilize sustainable resources as alternatives to fossil feedstocks. In this study, a well-defined, air-stable Cp*Co(iii)-catalyst for transfer hydrogenation of quinoline derivatives and oxidative dehydrogenation of cyclic amines in water is developed. While the former reaction is promoted by formic acid as a transfer hydrogenation reagent, the latter is mediated by molecular oxygen as the sole oxidant. These processes provide new avenues for the investigation of air-stable cobalt catalysts for environmentally benign hydrogenation and dehydrogenation reactions.
Chen, Shuo; Rong, Qingshan; Liu, Dongmei; Sun, Na; Yao, Zhiwei
doi: 10.1039/d3dt02464dpmid: 37819243
Interestingly, the metal–support interaction (MSI) influence of different metal phosphides on catalytic stability might be different in dry reforming of methane (DRM). After being supported on Al2O3, there was a rise, decline and no change in the catalytic stability of CoMoP, MoP and Co2P, respectively. This was probably because the MSI can tune the structural stability, methane dissociation ability and oxidation resistance ability of metal phosphides, which were the key factors that determined their catalytic stability.
Reis, Melani J. A.; Nogueira, Ana T.; Eulálio, Ana; Moura, Nuno M. M.; Rodrigues, Joana; Ivanou, Dzmitry; Abreu, Paulo E.; Correia, M. Rosário P.; Neves, Maria G. P. M. S.; Pereira, Ana M. V. M.; Mendes, Adélio
doi: 10.1039/d3dt00512gpmid: 37548588
A new series of Zn(ii) and Cu(ii)-based porphyrin complexes 5a and 5b doubly functionalised with carbazole units were developed to be used as hole-transporting materials (HTMs) in perovskite solar cells (PSCs). These complexes were obtained via a nucleophilic substitution reaction mediated by PhI(OAc)2/NaAuCl4·2H2O, or using C–N transition metal-assisted coupling. The hole extraction capability of 5a and 5b was assessed using cyclic voltammetry; this study confirmed the better alignment of the Zn(ii) complex 5a with the perovskite valence band level, compared to the Cu(ii) complex 5b. The optimised geometry and molecular orbitals of both complexes also corroborate the higher potential of 5a as a HTM. Photoluminescence characterisation showed that the presence of 5a and 5b as HTMs on the perovskite surface resulted in the quenching of the emission, matching the hole transfer phenomenon. The photovoltaic performance was evaluated and compared with those of reference cells made with the standard HTM spiro-OMeTAD. The optimised 5-based devices showed improvements in all photovoltaic characteristics; their open circuit voltage (Voc) reached close to 1 V and short-circuit current density (Jsc) values were 13.79 and 9.14 mA cm−2 for 5a and 5b, respectively, disclosing the effect of the metallic centre. A maximum power conversion efficiency (PCE) of 10.01% was attained for 5a, which is 65% of the PCE generated by using the spiro-OMeTAD reference. This study demonstrates that C–N linked donor-type porphyrin derivatives are promising novel HTMs for developing efficient and reproducible PSCs.
Showing 1 to 10 of 48 Articles