Metal-Organic Framework Derived Bimetallic Materials for Electrochemical Energy Storage

This is the peer reviewed version of the following article: Metal-Organic Framework Derived Bimetallic Materials for Electrochemical Energy Storage, which has been published in final form at https://doi.org/10.1002/anie.202010093. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.[EN] Supercapacitors (SCs), showing excellent power density, long service life, and high reversibility, have received great attention because of the increasing demand for energy storage devices. To further improve their performance, it is essential to develop advanced electrode materials. One group of materials, porous crystalline solids referred to as metal-organic frameworks (MOFs), have proved to be excellent templates for synthesizing functional materials to be employed in the preparation of electrodes for SCs. In comparison to monometallic MOFs, bimetallic MOFs and their derivatives offer a number of advantages, including tunable electrochemical activity, high charge capacity, and improved electrical conductivity. This review focuses on the use of MOF-derived bimetallic materials in SCs, the origin of the improved performance, and the latest developments in the field. Furthermore, the challenges and perspectives in this research area are discussed.This work was supported by Tarbiat Modares University and College of Engineering, Peking University. Financial support by the Spanish Ministry of Science and Innovation (Severo Ochoa and RTI2018-98237-CO2-1) and Generalitat Valenciana (Prometeo 2017-083) is gratefully acknowledged.Sanati, S.; Abazari, R.; Albero-Sancho, J.; Morsali, A.; García Gómez, H.; Liang, Z.; Zou, R. (2021). Metal-Organic Framework Derived Bimetallic Materials for Electrochemical Energy Storage. Angewandte Chemie International Edition. 60(20):11048-11067. https://doi.org/10.1002/anie.2020100931104811067602

Design and Advanced Manufacturing of NU-1000 Metal–Organic Frameworks with Future Perspectives for Environmental and Renewable Energy Applications

Metal–organic frameworks (MOFs) represent a relatively new family of materials that attract lots of attention thanks to their unique features such as hierarchical porosity, active metal centers, versatility of linkers/metal nodes, and large surface area. Among the extended list of MOFs, Zr-based-MOFs demonstrate comparably superior chemical and thermal stabilities, making them ideal candidates for energy and environmental applications. As a Zr-MOF, NU-1000 is first synthesized at Northwestern University. A comprehensive review of various approaches to the synthesis of NU-1000 MOFs for obtaining unique surface properties (e.g., diverse surface morphologies, large surface area, and particular pore size distribution) and their applications in the catalysis (electro-, and photo-catalysis), CO2 reduction, batteries, hydrogen storage, gas storage/separation, and other environmental fields are presented. The review further outlines the current challenges in the development of NU-1000 MOFs and their derivatives in practical applications, revealing areas for future investigation

Immediate Results of Percutaneous Trans-Luminal Mitral Commissurotomy in Pregnant Women with Severe Mitral Stenosis

Background Valvular heart diseases and mainly rheumatic heart diseases complicate about 1% of pregnancies. During pregnancy physiological hemodynamic changes of the circulation are the main cause of mitral stenosis (MS) decompensation. Prior to introduction of percutaneous mitral balloon commissuroplasty (PTMC), surgical comissurotomy was the preferred method of treatment in patients with refractory symptoms. PTMC is an established non-surgical treatment of rheumatic mitral stenosis. The study aimed to assess the safety and efficacy of PTMC in pregnant women with severs mitral stenosis. Material and Method Thirty three consecutive patients undergoing PTMC during pregnancy enrolled in this prospective study. Mitral valve area (MVA), transmitral valve gradient (MVG), and severity of mitral regurgitation (MR) were assessed before and 24 hour after the procedure by transthoracic and transesophageal echocardiography. Mitral valve morphology was evaluated before the procedure using Wilkin's criteria. Patient followed for one month and neonates monitored for weight and height and adverse effect of radiation. Result Mitral valve area increased from 0.83 ± 0.13 cm 2 to 1.38 ± 0.29 cm 2 ( P = 0.007). Mean gradient of mitral valve decreased from 15.5 ± 7.4 mmHg to 2.3 ± 2.3 mmHg ( P = <0.001). Pulmonary artery pressure decreased from 65.24 ± 17.9 to 50.45 ± 15.33 ( P = 0.012). No maternal death, abortion, intrauterine growth restriction was observed and only one stillbirth occurred. Conclusion PTMC in pregnant women has favorable outcome and no harmful effect on children noted

First-row transition metal-based materials derived from bimetallic metal-organic frameworks as highly efficient electrocatalysts for electrochemical water splitting

Electrochemical water splitting is a mature technology for hydrogen generation. Numerous studies have focused on the development of highly efficient electrocatalysts to produce hydrogen and oxygen from water electrolysis through the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Up to now, the most effective electrocatalysts for electrochemical water splitting are still materials based on Pt, Ru and Ir. Although these materials exhibit very good performance, their massive utilization is limited due to the scarce resources. Therefore, the search for suitable, efficient, inexpensive, stable and abundant materials for electrochemical water splitting is imperative for the large-scale, worldwide, commercial implementation of electrolytic hydrogen generation. Abundant first-row transition metal-based electrocatalysts for water splitting are considered as promising alternatives to those based on noble metals. It has been found that materials combining two metals exhibit enhanced electrocatalytic activity. It is the focus of this review to show that efficient first-row bimetallic materials can be obtained from the corresponding metal-organic frameworks (MOFs) as precursors. The present review describes recent advances in bimetallic electrocatalysts derived from bimetallic MOFs containing first row transition metals, including bimetallic oxides, bimetallic chalcogenides, bimetallic nitrides and their composites. Challenges in this area and future research directions are highlighted.This work was supported by Tarbiat Modares University and financial support from the Spanish Ministry of Science and Innovation (Severo Ochoa and RTI2018-98237-CO2-1), Generalitat Valenciana (Prometeo 2017-083) and the European Commission (ECO2Fuel) is gratefully acknowledged

Efficient bifunctional hydrogen and oxygen evolution reaction electrocatalyst based on the NU-1000/CuCo2S4 heterojunction

One of the current necessities to produce clean energy is the logical design of inexpensive noble-metal free electrocatalysts with developed structure and composition for electrochemical water splitting. In this study, we introduce a new core-shell-structured bifunctional electrocatalyst of NU-1000/CuCoS for oxygen evolution reaction (OER), hydrogen evolution reaction (HER) and overall water splitting for the first time. Own to unique structure with rich porosity, high electrical conductivity, high stability and larger density of active sites, this nanocomposite can produce water electrolysis in a 1 M KOH solution. The electrochemical measurements show overpotentials of 335 mV for OER and 93 mV for HER at a current density of 10 mAcm. Also, the NU-1000/CuCoS nanocomposite exhibits Tafel slope values of 110 mV dec and 103 mV dec for HER and OER, respectively. Besides, NU-1000/CuCoS presents a significant long-term stability in a 72 h run. Additionally, NU-1000/CuCoS requires 1.55 V to deliver 10 mA cm current density in overall water splitting. According to these results, we hope to use this electrocatalyst in producing oxygen and hydrogen from water.This work was supported by Tarbiat Modares University and financial support by the Spanish Ministry of Science and Innovation (Severo Ochoa CEX2021-1230-S and PDI2021-126071OB-C2198237-CO2-1) and Generalitat Valenciana (Prometeo 2021-038) is gratefully acknowledged

Growth kinetics and Pho84 phosphate transporter activity of Saccharomyces cerevisiae under phosphate-limited conditions

The effect of phosphate (P ( i )) concentration on the growth behavior of Saccharomyces cerevisiae strain CEN.PK113-5D in phosphate-limited batch and chemostat cultures was studied. The range of dilution rates used in the present study was 0.08-0.45 h(-1). The batch growth of yeast cells followed Monod relationship, but growth of the cells in phosphate-limited chemostat showed change in growth kinetics with increasing dilution rates. The difference in growth kinetics of the yeast cells in phosphate-limited chemostat for dilution rates below and above approximately 0.2 h(-1) has been discussed in terms of the batch growth kinetic data and the change in the metabolic activity of the yeast cells. Immunological detection of a C-terminally myc epitope-tagged Pho84 fusion protein indicated derepressive expression of the Pho84 high-affinity P ( i ) transporter in the entire range of dilution rates employed in this study. Phosphate transport activity mediated by Pho84 transporter was highest at very low dilution rates, i.e. 0.08-0.1 h(-1), corresponding to conditions in which the amount of synthesized Pho84 was at its maximum

Metal–Organic Frameworks as Electrocatalysts

Transition metal complexes are well-known homogeneous electrocatalysts. In this regard, metal–organic frameworks (MOFs) can be considered as an ensemble of transition metal complexes ordered in a periodic arrangement. In addition, MOFs have several additional positive structural features that make them suitable for electrocatalysis, including large surface area, high porosity, and high content of accessible transition metal with exchangeable coordination positions. The present review describes the current state in the use of MOFs as electrocatalysts, both as host of electroactive guests and their direct electrocatalytic activity, particularly in the case of bimetallic MOFs. The field of MOF-derived materials is purposely not covered, focusing on the direct use of MOFs or its composites as electrocatalysts. Special attention has been paid to present strategies to overcome their poor electrical conductivity and limited stability.Financial support by the Spanish Ministry of Science and Innovation (Severo Ochoa and PDI2021-126071-OB-C21), Generalitat Valenciana (Prometeo 2021-038) and Tarbiat Modares University is gratefully acknowledged.Peer reviewe

High specific capacitance of a 3D-metal-organic framework-confined growth in CoMn2O4nanostars as advanced supercapacitor electrode materials

In the presence of fossil fuels, several environmental concerns, such as energy shortage, environmental pollution, and global warming may occur in the present century. In this respect, supercapacitors have been introduced as green energy storage systems playing a central role in providing a sustainable human society. In this work, an advanced strategy was initially demonstrated through various synergistic effects to synthesize cobalt(ii) metal-organic framework#CoMn2O4nanocomposites (Co(ii)-TMU-63#CoMn2O4NCPs) having interfaces adapted at tunable chemical nanocomposites for hybrid supercapacitors. The given NCPs showed excellent electrochemical performance at 7 A g−1current density endowed with a specific capacity of 156 mA h g−1(1420 F g−1) and good cycling stability at 10 A g−1current density, following 7000 cycles with 93.3% capacity retention. The hybrid supercapacitor was assembled using activated carbon (AC) as negative and NCPs as positive electrodes, which delivered specific energy of 38.54 W h kg−1and maximum-specific power of 2312.4 W kg−1with 89.5% capacity retention over 7000 cycles. The enhanced electrochemical performances of Co(ii)-TMU-63#CoMn2O4NCPs can be attributed to the high surface area, porous structure, open metal sites functioning as electron collectors to enhance electron transfer as well as unique morphology and synergistic effect between Co(ii)-TMU-63 and CoMn2O4. This work may inspire a new development of interface-adapted nanocomposite for advanced energy storage applications.</p