INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yuyu Li,Fang Luo,Yuhua Xie,Chaofeng Chang,Ming Xie,Zehui Yang
Urea oxidation reaction (UOR) is a promising substitution of oxygen evolution reaction (OER) in overall water splitting technology because of the lower theoretical potential; thereby, a win-win benefit is achieved due to the simultaneous hydrogen generation and water purification . The efficient UOR catalysis substantially depends on the exposed active sites and mass transfer resistance, especially at high current density to meet the requirement of industrial water splitting technology. In this work, we have synthesized α-Ni(OH) 2 porous nanoflowers (α-Ni(OH) 2 –PNF) using ZIF-67 as template. Ascribing to the Kirkendall effect , nanopores are created on α-Ni(OH) 2 nanosheets benefiting for the formation of abundant oxygen vacancies as well as drop-off in mass transfer resistance during UOR catalysis. Meanwhile, the binding strength between active site and CO 2 , rate-determining step of UOR, is weakened by oxygen vacancies; as a result, only 1.477 V vs. RHE is demanded for α-Ni(OH) 2 –PNF to catalyze UOR with 100 mA cm −2 , 67 mV lower than α-Ni(OH) 2 nanosheets. Besides, an exceptional stability is also achieved for α-Ni(OH) 2 –PNF with negligible degradation during 20 h catalysis.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Yanzhou Ding,Yiwen Zhu,Xia Yu,Shuguang Lyu,Yanlin Wu,Lei Zhou,Qian Sui
Antibiotic residues in aquatic environments can be effectively degraded by hydroxyl radical ( OH)-based advanced oxidation processes (AOPs). However, the reaction kinetics and mechanisms have not been comprehensive determined due to the limitations of conventional competition kinetic methods and mass spectrometry-based product identification, as these methods fail to exclude interference from secondary radicals and are unable to capture unstable intermediates or transient species. In this study, these limitations were overcome using laser flash photolysis (LFP) and density functional theory (DFT) calculations, allowing accurate determination of the OH-initiated reaction kinetics and degradation mechanisms of florfenicol (FF), a model veterinary antibiotic compound that is frequently detected in the environment. Based on the LFP experiment results, the second order rate constant ( k ) between OH and FF was determined to be 1.96 × 10 9 M −1 s −1 by tracking the typical signal of (SCN) 2 − . Furthermore, DFT calculations revealed two distinct mechanisms for OH addition to the benzene ring and identified hydrogen atom abstraction (HAA) reaction from chiral carbons as being the most favorable initial reaction for OH. In addition, the destruction of chlorine moiety occurred via hydroxylation-chlorine abstraction, rather than direct chlorine abstraction or substitution reactions. The resistance of chlorine moiety to degradation during the initial oxidation process, resulted in the formation of chlorine-containing by-products. This study provided a novel approach to comprehensively investigate the mechanisms of emerging contaminants elimination during OH-based AOPs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Xiahui Lin,Yilin Gao,Min Jiang,Yongfan Zhang,Yidong Hou,Wenxin Dai,Sibo Wang,Zhengxin Ding
Herein, we report the facile synthesis of uniform perovskite hydroxide CoSn(OH) 6 nanocubes and their first use as noble-metal-free, highly efficient and stable catalysts for the deoxygenative reduction of CO 2 to CO with visible light. The CoSn(OH) 6 sample is synthesized through a one-pot co-precipitation method and fully characterized by various techniques including XRD, FTIR, FESEM, TEM, EDX, EDX-mappings, XPS, DRS, and N 2 sorption measurements. The CoSn(OH) 6 solid is found by theoretical calculations to be capable of absorbing and activating CO 2 molecules on the (100) surface. Under the optimal reaction conditions, the CoSn(OH) 6 catalyst exhibits a high CO 2 reduction activity with visible light irradiation, affording a CO generation rate of 18.7 μmol h −1 . The stability and reusability of the CoSn(OH) 6 catalyst for photocatalytic CO 2 reduction are solidly confirmed. Results of in situ photoluminescence spectroscopy and photocurrent response characterizations indicate that the CoSn(OH) 6 catalyst can efficiently promote the separation and transfers of photoexcited charge carriers during photocatalysis, and eventually leading to obviously enhanced CO 2 photoreduction performance. Moreover, a possible mechanism for the photocatalytic CO 2 reduction reaction is also proposed based on the results of activity evaluation and photo-/electro-chemical measurements.
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HIGH PERFORMANCE POLYMERS
·
2017
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IF 1.179
Jun Song,Zhendong Dai,Jingyu Li,Haichao Zhao,Liping Wang
Boron nitride-hydroxyl (BN–OH) was synthesized with silane coupling agent (KH550) in order to achieve epoxy/BN nanocomposites with excellent thermal, tribological, and mechanical properties. This is an efficient method to improve epoxy nanocomposite properties. These properties were investigated by friction and wear test, thermogravimetric analysis, and dynamic mechanical analysis. The wear mechanisms were studied by scanning electron microscopy. Surface modification of BN–OH with silane coupling agent significantly enhanced its thermal stability. Storage modulus of the nanocomposite with 2% epoxy/BN increased by nearly 300% in comparison with that of pure epoxy. The results exhibit outstanding performance of the epoxy/BN nanocomposites compared with pure epoxy resin.
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BIOSENSORS & BIOELECTRONICS
·
2024
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IF 10.7
Yanpei Xu,Haoyu Wu,Meng Sun,Hongyu Song,Chuxiao Sun,Fudong Jia,Qi Wang
In the detection of biomolecules, surface plasmon resonance (SPR) sensors require high sensitivity. In this study, we propose a sensitivity-enhanced functionalized plasmonic interface based on Ag–TiO 2 –Co(OH) 2 nanosheets structure. Compared to unmodified SPR sensors, the sensitivity of the sensor decorated with TiO 2 and Co(OH) 2 nanosheets is increased by 130.84%, reaching 5764.27 nm/RIU. This enhancement is attributed to the high refractive index of the coating, as well as the high specific surface area and abundant active sites provided by the synthesized Co(OH) 2 nanosheets with a multi-grooved structure. Additionally, employing a double-antibody sandwich method, the antibody-functionalized plasmonic interface enables specific detection of human serum albumin (HSA). The linear response of this sensor was in the wide range of 0.4–150 μM, and the LOD reached 154.89 nM(K D is approximately 1.73 × 10 −6 M). This novel SPR sensor offers a new strategy for biochemical sensing and provides a highly sensitive platform for immunoassays.
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PubMed
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Progress in Natural Science-Materials International
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2024
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IF 4.8
Shijia Liu,Haibin Wang,Xi Wang,Jieshu Zhou,Hongyan Liang
Electroreduction of CO 2 for formic acid production has been regarded as an efficient option for CO 2 utilization. However, under high current, achieving high selectivity for formic acid is challenging, which cannot meet industrial demands. Herein, we reported a type of Bi/In(OH) 3 (BIO) heterojunction reconstructed from Bi 2 S 3 /In(OH) 3 during electrochemical process, in which In(OH) 3 was applied to modulate the electronic structure of Bi. This strategy efficiently enhanced the ∗OCHO intermediates adsorption and lead to a decent selectivity towards formic acid under high current density. BIO displays faraday efficiency of formic acid beyond 95 % across a wide range current density of 200–400 mA cm −2 , where the highest value reached 97.7 % at 400 mA cm −2 . This work clarified the mechanism of CO 2 electroreduction to HCOOH on heterojunction, guiding the design of advanced catalysts.
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Battery Energy
·
2024
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IF 9
Xiangchao Xu,Fen Qiao,Yanzhen Liu,Wenjie Liu
Cu(OH) 2 has the advantages of ease of structural regulation, good conductivity, and relatively low cost, making it a suitable candidate material for use as an electrocatalyst. However, its catalytic efficiency and stability still need to be improved further. Therefore, Cu(OH) 2 /Cu 2 S was successfully prepared on copper foam (CF) using the in situ growth and hydrothermal method. The structural characterization showed that sulfidation treatment induced transformation of Cu(OH) 2 /CF from smooth nanorods into a coral-like structure, which exposed more active sites of Cu(OH) 2 /Cu 2 S and enhanced the performance of electrocatalytic hydrogen evolution reaction (HER). Compared with Cu(OH) 2 , Cu(OH) 2 /Cu 2 S showed better alkaline HER performance, especially when the vulcanization concentration was 0.1 M, the overpotential of Cu(OH) 2 /Cu 2 S was 174 mV, and the reaction kinetics was 64 mv dec −1 at a current density of 10 mA cm −2 . In this work, the morphology and electronic structure of copper-based metal sulfide electrocatalysts were adjusted by sulfide treatment, which provided a new reference for improving HER performance.
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CRYSTENGCOMM
·
2025
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IF 2.6
Wei Jia,Qi He,Zhiqiang Guo,Xiang Wu
It is very important to rationally design electrode materials with remarkable electrical conductivity and high specific surface area for supercapacitors. However, it is limited by insufficient energy density, so the development of high-performance electrodes has become research focuses. Herein, we report the synthesis of CoMoO4@Ni(OH)2 composite structures by hydrothermal growth of Ni(OH)2 nanosheets on CoMoO4 materials. The synthesized product achieves 93% of capacitance retention after 10,000 times cycling and possesses a specific capacitance of 2640 F g-1 at 1 A g-1. Furthermore, the assembled device delivers an energy density of 74.25 Wh kg-1 when the power density is 2700 W kg-1. Besides, the materials still present outstanding flexibility and mechanical stability after bending at different angles and times.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 7
·1-11
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IF 5.3
Zhao Zhihua,Yao Longqi,Zhang Shuaiwen,Shi Qingsheng,Rahmatullah Abu Bakker Md,Wu Lan
Industrialization and agricultural demand have both improved human life and led to environmental contamination. Especially the discharge of a lot of poisonous and harmful gases, including ammonia, ammonia pollution has become a pressing problem. High concentrations of ammonia can pose significant threats to both the environment and human health. Therefore, accurate monitoring and detection of ammonia gas are crucial. To address this challenge, we have developed an ammonia gas sensor using In(OH) 3 /Ti 3 C 2 T x nanocomposites through an in-situ electrostatic self-assembly process. This sensor was thoroughly characterized using advanced techniques like XRD, XPS, BET, and TEM. In our tests, the I/M-2 sensor exhibited remarkable performance, achieving a 16.8% response to 100 ppm NH 3 at room temperature, which is a 3.5-fold improvement over the pure Ti 3 C 2 T x MXene sensor. Moreover, it provides swift response time (20 s), high response to low NH 3 concentrations (≤ 10 ppm), and excellent long-term stability (30 days). These exceptional characteristics indicate the immense potential of our In(OH) 3 /Ti 3 C 2 T x gas sensor in ammonia detection. Graphical Abstract
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Catalysts
·
2025
·Vol. 15
·期 9
·886
·
IF 4
Qianran Feng,Xiaoting Yu,Jinlian Peng,Siying Du,Liuyun Chen,Xinyuan Xu,Tongming Su
Sustainable production of hydrogen is currently a global research hotspot. In this study, a Ni(OH)2cocatalyst was loaded on Zn0.8Cd0.2S to form Ni(OH)2/ZCS composites and achieve highly efficient photocatalytic hydrogen production. After Ni(OH)2loading, a close contact interface was established between Ni(OH)2and Zn0.8Cd0.2S, which increased the separation efficiency of the photogenerated electrons and holes. Moreover, the addition of Ni(OH)2increases the specific surface area and light absorption of Ni(OH)2/Zn0.8Cd0.2S, and the Ni(OH)2can act as active sites for photocatalytic hydrogen production. The photocatalytic H2production rate of Ni(OH)2/ZCS composites increases with the increase in the Ni amount. 9Ni(OH)2/ZCS exhibited the optimum H2production rate of 12.88 mmol h−1g−1, which was 9.9 times higher than that of Zn0.8Cd0.2S. When the amount of Ni(OH)2is further increased, the excess Ni(OH)2covers the active site of Zn0.8Cd0.2S and reduced the light absorption of Zn0.8Cd0.2S, resulting in a decrease in the H2production rate. Furthermore, the H2production rate of 9Ni(OH)2/ZCS decreased from 12.88 to 5.15 mmol g−1h−1after 3 cycles. The main reason for the decline in the photocatalytic performance of Ni(OH)2/ZCS is the photocorrosion of Zn0.8Cd0.2S. This study provides an innovative design for loading Ni(OH)2cocatalysts on Zn0.8Cd0.2S to improve the performance of photocatalysts.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Siqi Liu,Xiezhen Zhou,Weiqing Han,Jiansheng Li,Xiuyun Sun,Jinyou Shen,Lianjun Wang
Flutriafol is one of the widely used triazole fungicides in global pesticides market, and its degradation mechanisms are important to develop powerful technologies to remove it. Insight into the kinetics and mechanisms of · OH-mediated mineralization of flutriafol have been obtained using quantum chemical calculation and electrochemical experiment methods. The complete · OH-mediated degradation pathway of flutriafol was proposed by density functional theory (DFT) simulation and the potential energy surface was mapped out for possible reactions. On the basis of DFT calculations, the optimal · OH-mediated mineralization mechanism of flutriafol was revealed, and a series of intermediates were observed accumulated in the degradation process, most significance among which were (2-fluorophenyl) (4-fluorophenyl)-Methanone, phenol , dihydroxybenzenes, benzoquinones , muconic acids , maleic acids , oxalic acids and formic acid . To give deeper insight into the · OH-mediated reaction mechanism, the electrostatic potential (ESP) and average local ionization energy (ALIE) analysis were conducted for o-benzoquinone and p-benzoquinone. The proposed mechanism was further validated by electrochemical experiments at TiO 2 -NTs/SnO 2 -Sb/PbO 2 anode. The main intermediates were identified and quantified by experimental method, indicating that the proposed · OH-mediated degradation mechanism derived from DFT calculations was feasible. These detailed findings could be instrumental for a comprehensive understanding of the · OH-mediated mineralization mechanism of flutriafol and the similar contaminants.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Binglin Guo,Yihao Gao,Yongyue Li,Xin Sun,Shuailin Chen,Meicheng Li
Ni(OH)2 has low production cost and high theoretical specific capacity, while on account of the poor electronic conductivity, it shows inferior electrochemical performance including cycling stability and rate capability. This work focuses on a composite material that is in situ grown Ni(OH)2 nanosheets on reduced graphene oxide (rGO), and employing the fewer-defect rGO to build a three-dimensional conductive network provides outstanding conductivity. The specific capacitances (Cm) of the Ni(OH)2/rGO (NHG) electrode are 2776 F·g–1 at 2 A·g–1 and even 1570 F·g–1 at 50 A·g–1, demonstrating remarkable rate capability. It indicates that the combination of the nano grown Ni(OH)2 and rGO conductive substrate shortens the ion diffusion path and increases the electron transfer rate; hence, the composite rate capability has been significantly improved. The composite materials and active carbon were combined to be an asymmetric supercapacitor, which had a high energy density of 39.24 Wh·kg–1 at 1962 W·kg–1. After 10,000 cycles at 5 A·g–1, the capacity retains 91.4%.
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