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Bibi M, Yu Y, Nisar A, Zafar A, Liu Y, Karim S, Mehboob S, Faiz Y, Sun H, Ali T, Khalid A, Safdar A, Faiz F, Ahmad M. NiCo 2O 4@SnS 2nanosheets on carbon cloth as efficient bi-functional material for high performance supercapacitor and sensor applications. NANOTECHNOLOGY 2024; 35:255701. [PMID: 38461552 DOI: 10.1088/1361-6528/ad3219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 03/10/2024] [Indexed: 03/12/2024]
Abstract
Bi-functional materials provide an opportunity for the development of high-performance devices. Up till now, bi-functional performance of NiCo2O4@SnS2nanosheets is rarely investigated. In this work, NiCo2O4@SnS2nanosheets were synthesized on carbon cloth by utilizing a simple hydrothermal technique. The developed electrode (NiCo2O4@SnS2/CC) was investigated for the detection of L-Cysteine and supercapacitors applications. As a non-enzymatic sensor, the electrode proved to be highly sensitive for the detection of L-cysteine. The electrode exhibits a reproducible sensitivity of 4645.82μA mM-1cm-2in a wide linear range from 0.5 to 5 mM with a low limit of detection (0.005μM). Moreover, the electrode shows an excellent selectivity and long-time stability. The high specific surface area, enhanced kinetics, good synergy and distinct architecture of NiCo2O4@SnS2nanosheets produce a large number of active sites with substantial energy storage potential. As a supercapacitor, the electrode exhibits improve capacitance of 655.7 F g-1at a current density of 2 A g-1as compare to NiCo2O4/CC (560 F g-1). Moreover, the electrode achieves 95.3% of its preliminary capacitance after 10 000 cycles at 2 A g-1. Our results show that NiCo2O4@SnS2/CC nanosheets possess binary features could be attractive electrode material for the development of non-enzymatic biosensors as well as supercapacitors.
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Affiliation(s)
- Maria Bibi
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad, 44000, Pakistan
- School of Chemical and Materials Engineering, National University of Sciences and Technology (NUST), Islamabad, 44000, Pakistan
| | - Yanlong Yu
- College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318, People's Republic of China
| | - Amjad Nisar
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad, 44000, Pakistan
| | - Amina Zafar
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad, 44000, Pakistan
- Central Analytical Facility Division, PINSTECH, Islamabad, 44000, Pakistan
| | - Yanguo Liu
- School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, People's Republic of China
| | - Shafqat Karim
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad, 44000, Pakistan
| | | | - Yasir Faiz
- Chemistry Division, PINSTECH, Islamabad, 44000, Pakistan
| | - Hongyu Sun
- School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, People's Republic of China
| | - Tahir Ali
- Microstructural Studies Group, Physics Division, PINSTECH, Islamabad, 44000, Pakistan
| | - Atia Khalid
- School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People's Republic of China
| | - Amna Safdar
- School of Chemical and Materials Engineering, National University of Sciences and Technology (NUST), Islamabad, 44000, Pakistan
| | - Faisal Faiz
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, People's Republic of China
| | - Mashkoor Ahmad
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad, 44000, Pakistan
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Palladium particles supported on porous CeMnO3 perovskite for catalytic oxidation of benzene. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126687] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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3
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Eßer E, Schröder D, Nartova AV, Dmitrachkov AM, Kureti S. Reduction of NOx by H2 on WOx-Promoted Pt/Al2O3/SiO2 Catalysts Under O2-Rich Conditions. Catal Letters 2021. [DOI: 10.1007/s10562-021-03747-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractThis work addresses the reduction of NOx by H2 under O2-rich conditions using Al2O3/SiO2-supported Pt catalysts with different loads of WOx promotor. The samples were thoroughly characterised by N2 physisorption, temperature-programmed desorption of CO, scanning electron microscopy, X-ray diffraction, laser raman spectroscopy, X-ray photoelectron spectroscopy and diffuse reflectance infrared fourier transform spectroscopy with probe molecule CO. The catalytic studies of the samples without WOx showed pronounced NOx conversion below 200 °C, whereas highest efficiency was related to small Pt particles. The introduction of WOx provided increasing deNOx activity as well as N2 selectivity. This promoting effect was referred to an additional reaction path at the Pt-WOx/Al2O3/SiO2 interface, whereas an electronic activation of Pt by strong metal support interaction was excluded.
Graphic Abstract
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Hou J, He X, Zhang S, Yu J, Feng M, Li X. Recent advances in cobalt-activated sulfate radical-based advanced oxidation processes for water remediation: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 770:145311. [PMID: 33736411 DOI: 10.1016/j.scitotenv.2021.145311] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 01/12/2021] [Accepted: 01/16/2021] [Indexed: 06/12/2023]
Abstract
Sulfate radical-based advanced oxidation processes (SR-AOPs) have attracted increasing attention for the degradation of organic contaminants in water. The oxidants of SR-AOPs could be activated to generate different kinds of reactive oxygen species (ROS, e.g., hydroxyl radicals (OH), sulfate radicals (SO4-), singlet oxygen (1O2), and superoxide radicals (O2-)) by various catalysts. As one of the promising catalysts, cobalt-based catalysts have been extensively investigated in catalytic activity and stability during water remediation. This article mainly summarizes recent advances in preparation and applications of cobalt-based catalysts on peroxydisulfate (PDS)/peroxymonosulfate (PMS) activation since 2016. The review covers the development of homogeneous cobalt ions, cobalt oxides, supported cobalt composites, and cobalt-based mixed metal oxides for PDS/PMS activation, especially for the latest nanocomposites such as cobalt-based metal-organic frameworks and single-atom catalysts. This article also discussed the activation mechanisms and the influencing factors of different cobalt-based catalysts for activating PDS/PMS. Finally, the future perspectives on the challenges and applications of cobalt-based catalysts are presented at the end of this paper.
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Affiliation(s)
- Jifei Hou
- School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Xiudan He
- School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Shengqi Zhang
- College of Environment & Ecology, Xiamen University, Xiamen 361102, China
| | - Jialin Yu
- School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Mingbao Feng
- College of Environment & Ecology, Xiamen University, Xiamen 361102, China.
| | - Xuede Li
- School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
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Xu M, Zhou H, Wu Z, Li N, Xiong Z, Yao G, Lai B. Efficient degradation of sulfamethoxazole by NiCo 2O 4 modified expanded graphite activated peroxymonosulfate: Characterization, mechanism and degradation intermediates. JOURNAL OF HAZARDOUS MATERIALS 2020; 399:123103. [PMID: 32937720 DOI: 10.1016/j.jhazmat.2020.123103] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 05/24/2020] [Accepted: 05/31/2020] [Indexed: 06/11/2023]
Abstract
Expanded graphite (EG) immobilized nickel ferrite (NiCo2O4) was successfully constructed by a simple hydrothermal approach and applied for the degradation of sulfamethoxazole (SMX) in model wastewater by peroxymonosulfate (PMS) activation. The features of prepared catalysts were characterized by SEM, TEM, EDS, XRD, BET, TPD and XPS techniques. The influences of several critical parameters including the prepared NiCo2O4-EG dosages, PMS concentrations, temperature, initial solution pH and inorganic ions on SMX removal were studied in details. In particular, the synthesized NiCo2O4-EG exhibits excellent catalytic performances for SMX depredation over a wide pH range (pH 3.0-11.0). Besides, the transformation of various reactive oxygen species (SO4-, HO, O2- and 1O2) with the change of initial pH was investigated by the electron paramagnetic resonance (EPR) and quenching tests. In addition, twelve major degradation intermediates of SMX were detected by UPLC-QTOF-MS/MS. Finally, the PMS activation mechanism in NiCo2O4-EG/PMS system by the synergistic coupling of EG and NiCo2O4 were put forward. In brief, this work provided a promising and potential catalyst for PMS activation to remove SMX from wastewater.
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Affiliation(s)
- Mengjuan Xu
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Hongyu Zhou
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Zelin Wu
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Naiwen Li
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China.
| | - Zhaokun Xiong
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Gang Yao
- Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China; Institute of Environmental Engineering, RWTH Aachen University, Germany
| | - Bo Lai
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China.
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Patel VK, Sharma S. Supports materialization of Pd based catalysts for NO
x
removal by hydrogen assisted selective catalytic reduction in the presence of oxygen. ChemCatChem 2020. [DOI: 10.1002/cctc.202000756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Vivek Kumar Patel
- Department of Chemical Engineering & Technology Indian Institute Of Technology Banaras Hindu University Varanasi 221005 Uttar Pradesh India
| | - Sweta Sharma
- Department of Chemical Engineering & Technology Indian Institute Of Technology Banaras Hindu University Varanasi 221005 Uttar Pradesh India
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Shahid M, He C, Sankarasubramanian S, Ramani VK, Basu S. Co 3O 4-Impregnated NiO-YSZ: An Efficient Catalyst for Direct Methane Electrooxidation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:32578-32590. [PMID: 32589004 DOI: 10.1021/acsami.0c06407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Co3O4-impregnated NiO-YSZ (yttria-stabilized zirconia) is a possible electrocatalyst for direct methane electrooxidation with both high catalytic activity and the ability to mitigate coking. The physical and electrochemical properties of Co3O4-impregnated NiO-YSZ anodes are investigated and benchmarked against NiO-YSZ and CeO2-impregnated NiO-YSZ anodes. The following methane electrooxidation activity trend: Co3O4-impregnated NiO-YSZ > CeO2-impregnated NiO-YSZ > NiO-YSZ with io (exchange current density) values of 88, 83, and 2 mA cm-2, respectively, is obtained in the high overpotential region. The high activity of Co3O4-impregnated NiO-YSZ is attributed to the changes in the electronic structure and microstructure with the incorporation of nickel into the lattice of Co3O4 as observed using X-ray photoelectron spectroscopy, temperature-programmed reduction, high-resolution transmission electron microscopy, and field emission scanning electron microscopy. Co3O4-impregnated NiO-YSZ also demonstrated the least coking during operation, confirming its utility as a methane electrooxidation catalyst.
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Affiliation(s)
- Mohamed Shahid
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas 110016, India
| | - Cheng He
- Center for Solar Energy and Energy Storage and Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130-4899, United States
| | - Shrihari Sankarasubramanian
- Center for Solar Energy and Energy Storage and Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130-4899, United States
| | - Vijay K Ramani
- Center for Solar Energy and Energy Storage and Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130-4899, United States
| | - Suddhasatwa Basu
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas 110016, India
- CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India
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Zhu Y, Xia C, Shreka M, Wang Z, Yuan L, Zhou S, Feng Y, Hou Q, Ahmed SA. Combustion and emission characteristics for a marine low-speed diesel engine with high-pressure SCR system. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:12851-12865. [PMID: 30734255 DOI: 10.1007/s11356-019-04194-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 01/07/2019] [Indexed: 06/09/2023]
Abstract
In order to avoid the production of sulfates and nitrates in marine diesel engines that burn sulfur-containing fuels, the operating temperature of their high-pressure selective catalytic reduction (HP-SCR) systems should be higher than 320 °C. For marine low-speed diesel engines, only the pre-turbine exhaust gas temperature can meet this requirement under specific conditions, with the main engine modulation method helping to increase the exhaust gas temperature. However, the main engine modulation method brings down the power output and fuel economy of the main engine and causes the matching problem of the turbine and the other devices with the main engine. The original engine model of the marine low-speed diesel engine and the high-pressure SCR system configuration model have been constructed using one-dimensional simulation software. In addition, the performance of the high-pressure SCR system under the conditions of low-sulfur and high-sulfur exhaust gas was thoroughly analyzed. Moreover, the two main engine modulation schemes of the scavenging bypass and the turbine exhaust bypass of the original engine matching with the high-pressure SCR system were studied. The study found that the weighted average value of the NOx under the condition of low-sulfur exhaust gas met with the requirement of the IMO Tier III regulations when the low-speed diesel engine was matched with the high-pressure SCR system. However, the weighted average value of the NOx under the condition of high-sulfur exhaust gas was slightly higher than that required by the IMO Tier III regulation. In addition, the optimal main engine modulation scheme for this low-speed diesel engine was clarified by comparing the effects of the scavenging bypass and the turbine exhaust bypass modulation on the exhaust performance, and the working performance of the original engine. With an opening of 0.4 of the CBV valve under 25% engine load, the weighted average NOx of the original exhaust gas was 3.38 g/(kW·h), the power had decreased by 0.7%, and the fuel consumption had increased by 1.0%. Furthermore, when the EGB valve opening was 0.3, the weighted average value of NOx was 3.31 g/(kW·h), the power had reduced by 2.4% and the fuel consumption had increased by 2.5%. Both modulation scheme methods made the exhaust performance of the original engine meet the requirements of the IMO Tier III emission regulations, but the scavenging bypass modulation scheme had less impact on the original engine's performance.
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Affiliation(s)
- Yuanqing Zhu
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China
| | - Chong Xia
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China
| | - Majed Shreka
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China
| | - Zhanguang Wang
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China
| | - Lu Yuan
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China
| | - Song Zhou
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China
| | - Yongming Feng
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China.
| | - Qichen Hou
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China
| | - Salman Abdu Ahmed
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, People's Republic of China
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Adewuyi YG, Khan MA. Simultaneous NO and SO 2 removal by aqueous persulfate activated by combined heat and Fe 2+: experimental and kinetic mass transfer model studies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:1186-1201. [PMID: 29948722 DOI: 10.1007/s11356-018-2453-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 05/29/2018] [Indexed: 06/08/2023]
Abstract
This study evaluates the chemistry, kinetics, and mass transfer aspects of the removal of NO and SO2 simultaneously from flue gas induced by the combined heat and Fe2+ activation of aqueous persulfate. The work involves experimental studies and the development of a mathematical model utilizing a comprehensive reaction scheme for detailed process evaluation, and to validate the results of an experimental study at 30-70 °C, which demonstrated that both SO2 and Fe2+ improved NO removal, while the SO2 is almost completely removed. The model was used to correlate experimental data, predict reaction species and nitrogen-sulfur (N-S) product concentrations, to obtain new kinetic data, and to estimate mass transfer coefficient (KLa) for NO and SO2 at different temperatures. The model percent conversion results appear to fit the data remarkably well for both NO and SO2 in the temperature range of 30-70 °C. The conversions ranged from 43.2 to 76.5% and 98.9 to 98.1% for NO and SO2, respectively, in the 30-70 °C range. The model predictions at the higher temperature of 90 °C were 90.0 and 97.4% for NO and SO2, respectively. The model also predicted decrease in KLa for SO2 of 1.097 × 10-4 to 8.88 × 10-5 s-1 (30-90 °C) and decrease in KLa for NO of 4.79 × 10-2 to 3.67 × 10-2 s-1 (30-50 °C) but increase of 4.36 × 10-2 to 4.90 × 10-2 s-1 at higher temperatures (70-90 °C). This emerging sulfate-radical-based process could be applied to the treatment of flue gases from combustion sources. Graphical abstract.
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Affiliation(s)
- Yusuf G Adewuyi
- Chemical, Biological, and Bioengineering Department, North Carolina Agricultural and Technical State University, Greensboro, NC, 27411, USA.
| | - Md Arif Khan
- Chemical, Biological, and Bioengineering Department, North Carolina Agricultural and Technical State University, Greensboro, NC, 27411, USA
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10
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Wang D, Cuo Z, Li S, Zhang M, Chen Y. In situ anchored NiCo 2O 4 on a nickel foam as a monolithic catalyst by electro-deposition for improved benzene combustion performance. CrystEngComm 2020. [DOI: 10.1039/d0ce00095g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Monolithic catalysts designed by in situ electrodeposition possess a strong anchoring force and rich defects.
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Affiliation(s)
- Dongdong Wang
- State Key Laboratory of Multi-phase Complex Systems
- Institute of Process Engineering, Chinese Academy of Sciences
- Beijing 100190
- China
- University of Chinese Academy of Sciences
| | - Zhaxi Cuo
- State Key Laboratory of Multi-phase Complex Systems
- Institute of Process Engineering, Chinese Academy of Sciences
- Beijing 100190
- China
- University of Chinese Academy of Sciences
| | - Shuangde Li
- State Key Laboratory of Multi-phase Complex Systems
- Institute of Process Engineering, Chinese Academy of Sciences
- Beijing 100190
- China
| | - Min Zhang
- State Key Laboratory of Multi-phase Complex Systems
- Institute of Process Engineering, Chinese Academy of Sciences
- Beijing 100190
- China
- University of Chinese Academy of Sciences
| | - Yunfa Chen
- State Key Laboratory of Multi-phase Complex Systems
- Institute of Process Engineering, Chinese Academy of Sciences
- Beijing 100190
- China
- University of Chinese Academy of Sciences
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11
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Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation. Catalysts 2019. [DOI: 10.3390/catal9040352] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Rational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo2O4/NiO nanocage. This synthetic strategy contains a partial in situ transformation of ZIF-67 (zeolitic imidazolate framework-67) into Co-NiLDH yolk-shelled structures following ethanol etching, and a structure-preserved transformation from Co-NiLDH@ZIF-67 to a biphase nanocage following calcination. CoNi-yh-T (varied reaction time and calcination temperature) nanocages were investigated systematically by Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), H2- temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and studied for toluene oxidation. The CoNi-6h-350 sample showed much higher activity with 90% toluene conversion (T90) at 229 °C at a high space velocity (SV = 60,000 mL g−1 h−1) than other catalysts (T90 >240 °C). Abundant surface high valence Co ions caused by the novel hierarchical nanostructures, together with adsorbed oxygen species and abundant medium-strength surface acid sites, played a key role for catalytic activities.
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Jiang Y, Wang Y, Zeng D, Wang Y, Ma Y, Wang H, Zhang X, Dai X. A template-assisted strategy to synthesize a dilute CoNi alloy incorporated into ultramicroporous carbon for high performance supercapacitor application. Dalton Trans 2019; 48:4702-4711. [PMID: 30896691 DOI: 10.1039/c9dt00410f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbon is widely studied as an electrical double-layer capacitor (EDLC) electrode material due to its high specific surface area and good electronic conductivity. However, the low capacitance and energy density limit its further commercial applications. Herein, we report a facile and novel synthesis of dilute CoNi alloy nanoparticles embedded into ultramicroporous carbon (CoNi/UMCs) via a template-assisted strategy using SBA-15 as a template. The CoNi alloy serves as not only the electron collector to decrease the conductivity during tests, but also creates CoNi oxide/oxhydroxide on the alloy surface in an alkali solution, promoting redox reactions in pseudocapacitors, enhancing the performance of supercapacitors. Interestingly, the final morphology of the composite is not transferred from SBA-15 and the ultramicropores absolutely come from sucrose itself. However, the presence of SBA-15 can definitely enlarge the surface area of the CoNi/UMCs. After carefully tailoring the loading of CoNi, we find that 0.95% CoNi/UMCs exhibit a high surface area of 613 m2 g-1 with regular ultramicropores of 0.57 nm. Due to the synergistic effect of porous carbon and CoNi alloy, the unique 0.95% CoNi/UMCs exhibit a high specific capacitance of up to 268 F g-1 at 0.25 A g-1 in 6 M KOH aqueous solution and a high capacitance retention ratio of 97.8% after 10 000 cycles.
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Affiliation(s)
- Yan Jiang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
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Research Progress in the Selective Catalytic Reduction of NOx by H2 in the Presence of O2. CATALYSIS SURVEYS FROM ASIA 2018. [DOI: 10.1007/s10563-018-9248-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Trivedi S, Prasad R. Choice of precipitant and calcination temperature of precursor for synthesis of NiCo 2O 4 for control of CO-CH 4 emissions from CNG vehicles. J Environ Sci (China) 2018; 65:62-71. [PMID: 29548412 DOI: 10.1016/j.jes.2017.03.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 03/03/2017] [Indexed: 06/08/2023]
Abstract
Compressed natural gas (CNG) is most appropriate an alternative of conventional fuel for automobiles. However, emissions of carbon-monoxide and methane from such vehicles adversely affect human health and environment. Consequently, to abate emissions from CNG vehicles, development of highly efficient and inexpensive catalysts is necessary. Thus, the present work attempts to scan the effects of precipitants (Na2CO3, KOH and urea) for nickel cobaltite (NiCo2O4) catalysts prepared by co-precipitation from nitrate solutions and calcined in a lean CO-air mixture at 400°C. The catalysts were used for oxidation of a mixture of CO and CH4 (1:1). The catalysts were characterized by X-ray diffractometer, Brunauer-Emmett-Teller surface-area, X-ray photoelectron spectroscopy; temperature programmed reduction and Scanning electron microscopy coupled with Energy-Dispersive X-Ray Spectroscopy. The Na2CO3 was adjudged as the best precipitant for production of catalyst, which completely oxidized CO-CH4 mixture at the lowest temperature (T100=350°C). Whereas, for catalyst prepared using urea, T100=362°C. On the other hand the conversion of CO-CH4 mixture over the catalyst synthesized by KOH limited to 97% even beyond 400°C. Further, the effect of higher calcination temperatures of 500 and 600°C was examined for the best catalyst. The total oxidation of the mixture was attained at higher temperatures of 375 and 410°C over catalysts calcined at 500 and 600°C respectively. Thus, the best precipitant established was Na2CO3 and the optimum calcination temperature of 400°C was found to synthesize the NiCo2O4 catalyst for the best performance in CO-CH4 oxidation.
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Affiliation(s)
- Suverna Trivedi
- Department of Chemical Engineering &Technology, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Ram Prasad
- Department of Chemical Engineering &Technology, Indian Institute of Technology (BHU), Varanasi 221005, India.
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Trivedi S, Prasad R. Synthesis of K–Pd doped NiCo2O4−δ by reactive calcination route for oxidation of CO–CH4 emissions from CNG vehicles. NEW J CHEM 2018. [DOI: 10.1039/c7nj04902a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present study is devoted to formulating a doped spinel catalyst by a novel route of calcination for the oxidation of the CO–CH4 mixture emitted from compressed natural gas (CNG) vehicles.
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Affiliation(s)
- S. Trivedi
- Department of Chemical Engineering & Technology
- IIT (BHU)
- Varanasi-221005
- India
| | - R. Prasad
- Department of Chemical Engineering & Technology
- IIT (BHU)
- Varanasi-221005
- India
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Trivedi S, Prasad R. Selection of cobaltite and effect of preparation method of NiCo2O4for catalytic oxidation of CO-CH4mixture. ASIA-PAC J CHEM ENG 2017. [DOI: 10.1002/apj.2087] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- S. Trivedi
- Department of Chemical Engineering & Technology; Indian Institute of Technology (BHU); Varanasi 221005 India
| | - R. Prasad
- Department of Chemical Engineering & Technology; Indian Institute of Technology (BHU); Varanasi 221005 India
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