Mass production of single-atom cobalt photocatalyst for high-performance visible-light photocatalytic CO2 reduction

2021 ◽  
Author(s):  
Pianpian Zhang ◽  
Xiaoning Zhan ◽  
Lianbin Xu ◽  
Xianzhang Fu ◽  
Tianyu Zheng ◽  
...  
Keyword(s):  
Mass Production ◽  
Energy Supply ◽  
High Performance ◽  
High Efficiency ◽  
Low Cost ◽  
Co2 Reduction ◽  
Value Added ◽  
Single Atom ◽  
Chemical Products ◽  
Visible Light Photocatalytic

The photocatalytic reduction of carbon dioxide (CO2RR) into value-added chemical products is a promising way to enrich energy supply and reduce CO2 emission. The proposal of a high-efficiency, low-cost and...

Formamide-derived “glue” for hundred-gram scale synthesis of atomically dispersed iron-nitrogen-carbon electrocatalysts

Nanoscale ◽  
2021 ◽  
Author(s):  
Zong-Ge Li ◽  
Yan Ma ◽  
Yiyan Wang ◽  
Nianxi Liu ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Mass Production ◽  
High Performance ◽  
Low Cost ◽  
Single Atom ◽  
Distinct Structure ◽  
Metal Atoms ◽  
New Frontier ◽  
Maximum Utilization

he distinct structure and maximum utilization of metal atoms on supported single-atom catalysts (SAC) empowers a new frontier of heterogeneous catalysis, yet the low-cost mass production of high-performance SAC is...

scholarly journals Quasi-graphitic carbon shell-induced Cu confinement promotes electrocatalytic CO2 reduction toward C2+ products

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ji-Yong Kim ◽  
Deokgi Hong ◽  
Jae-Chan Lee ◽  
Hyoung Gyun Kim ◽  
Sungwoo Lee ◽  
...  
Keyword(s):  
High Efficiency ◽  
Co2 Reduction ◽  
Value Added ◽  
Material Design ◽  
Catalyst System ◽  
Critical Issue ◽  
Reduction Reaction ◽  
Catalyst Design ◽  
Design Strategies ◽  
Faradaic Efficiency

AbstractFor steady electroconversion to value-added chemical products with high efficiency, electrocatalyst reconstruction during electrochemical reactions is a critical issue in catalyst design strategies. Here, we report a reconstruction-immunized catalyst system in which Cu nanoparticles are protected by a quasi-graphitic C shell. This C shell epitaxially grew on Cu with quasi-graphitic bonding via a gas–solid reaction governed by the CO (g) - CO2 (g) - C (s) equilibrium. The quasi-graphitic C shell-coated Cu was stable during the CO2 reduction reaction and provided a platform for rational material design. C2+ product selectivity could be additionally improved by doping p-block elements. These elements modulated the electronic structure of the Cu surface and its binding properties, which can affect the intermediate binding and CO dimerization barrier. B-modified Cu attained a 68.1% Faradaic efficiency for C2H4 at −0.55 V (vs RHE) and a C2H4 cathodic power conversion efficiency of 44.0%. In the case of N-modified Cu, an improved C2+ selectivity of 82.3% at a partial current density of 329.2 mA/cm2 was acquired. Quasi-graphitic C shells, which enable surface stabilization and inner element doping, can realize stable CO2-to-C2H4 conversion over 180 h and allow practical application of electrocatalysts for renewable energy conversion.

Hierarchical three-dimensional copper selenide nanocubes microelectrodes for improved carbon dioxide reduction reaction

2021 ◽  
Author(s):  
Rajasekaran Elakkiya ◽  
Govindhan Maduraiveeran
Keyword(s):  
Carbon Dioxide ◽  
High Performance ◽  
Three Dimensional ◽  
Co2 Reduction ◽  
Value Added ◽  
Carbon Dioxide Reduction ◽  
Reduction Reaction ◽  
Earth Abundant ◽  
Carbon Dioxide Co2 ◽  
Co2 Reduction Reaction

Design of high-performance and Earth-abundant electrocatalysts for electrochemical carbon dioxide (CO2) reduction reaction (CO2RR) into fuels and value-added chemicals offers an emergent pathway for environment and energy sustainable concerns. Herein,...

scholarly journals Platinum–copper single atom alloy catalysts with high performance towards glycerol hydrogenolysis

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Xi Zhang ◽  
Guoqing Cui ◽  
Haisong Feng ◽  
Lifang Chen ◽  
Hui Wang ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Reaction Pathway ◽  
Theoretical Calculations ◽  
Experimental Studies ◽  
Value Added ◽  
Catalytic Performance ◽  
Single Atom ◽  
Glycerol Hydrogenolysis ◽  
Single Atom Alloy

AbstractSelective hydrogenolysis of biomass-derived glycerol to propanediol is an important reaction to produce high value-added chemicals but remains a big challenge. Herein we report a PtCu single atom alloy (SAA) catalyst with single Pt atom dispersed on Cu nanoclusters, which exhibits dramatically boosted catalytic performance (yield: 98.8%) towards glycerol hydrogenolysis to 1,2-propanediol. Remarkably, the turnover frequency reaches up to 2.6 × 103 molglycerol·molPtCu–SAA−1·h−1, which is to our knowledge the largest value among reported heterogeneous metal catalysts. Both in situ experimental studies and theoretical calculations verify interface sites of PtCu–SAA serve as intrinsic active sites, in which the single Pt atom facilitates the breakage of central C–H bond whilst the terminal C–O bond undergoes dissociation adsorption on adjacent Cu atom. This interfacial synergistic catalysis based on PtCu–SAA changes the reaction pathway with a decreased activation energy, which can be extended to other noble metal alloy systems.

Pathways toward high-performance inorganic perovskite solar cells: challenges and strategies

2019 ◽  
Vol 7 (36) ◽  
pp. 20494-20518 ◽  
Author(s):  
Bo Li ◽  
Lin Fu ◽  
Shuang Li ◽  
Hui Li ◽  
Lu Pan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Energy ◽  
High Performance ◽  
High Efficiency ◽  
Low Cost ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Challenges And Strategies

High-efficiency and low-cost perovskite solar cells (PSCs) are desirable candidates for addressing the scalability challenge of renewable solar energy.

Recent Progress on Adsorption Materials for Phosphate Removal

2019 ◽  
Vol 13 (1) ◽  
pp. 3-16 ◽  
Author(s):  
Saeed Ahmed ◽  
Muhammad Naeem Ashiq ◽  
Dianqing Li ◽  
Pinggui Tang ◽  
Fabrice Leroux ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Low Cost ◽  
Development Trend ◽  
Phosphate Removal ◽  
High Concentration ◽  
The Public ◽  
Removal Capacity ◽  
Detailed Search ◽  
Double Hydroxides

Background: High concentration of phosphate has been threatening human health and the ecosystem. Adsorption is one of high-efficiency and low-cost techniques to reduce the concentration of phosphate. This mini review aims to summarize the recent development of adsorption materials for phosphate removal. Method: We conducted a detailed search of “adsorption of phosphate” in the published papers and the public patents on the adsorbents for phosphate based on Web of Science database in the period from January 1 2012 to December 31 2017. The corresponding literature was carefully evaluated and analyzed. Results: One hundred and forty one papers and twenty two recent patents were included in this review. An increased trend in scientific contributions was observed in the development of adsorption materials for phosphate removal. Three kinds of promising adsorbents: layered double hydroxides, natural materials, and metal oxides were paid special attention including removal mechanism, performance as well as the relationship between adsorption performance and structure. Both the chemical composition and the morphology play a key role in the removal capacity and rate. Conclusion: The findings of this review confirm the importance of phosphate removal, show the development trend of high-performance and low-cost adsorption materials for phosphate removal, and provide a helpful guide to design and fabricate high-efficiency adsorbents.

scholarly journals Design and Implementation of Three-Level DC-DC Converter with Golden Section Search Based MPPT for the Photovoltaic Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Chouki Balakishan ◽  
N. Sandeep ◽  
M. V. Aware
Keyword(s):  
High Voltage ◽  
High Performance ◽  
High Efficiency ◽  
Low Cost ◽  
Golden Section ◽  
Boost Converter ◽  
Pv System ◽  
Point Tracking ◽  
Golden Section Search ◽  
Energy Conversion Systems

In many photovoltaic (PV) energy conversion systems, nonisolated DC-DC converters with high voltage gain are desired. The PV exhibits a nonlinear power characteristic which greatly depends on the environmental conditions. Hence in order to draw maximum available power various algorithms are used with PV voltage/current or both as an input for the maximum power point tracking (MPPT) controller. In this paper, golden section search (GSS) based MPPT control and its application with three-level DC-DC boost converter for MPPT are demonstrated. The three-level boost converter provides the high voltage transfer which enables the high power PV system to work with low size inductors with high efficiency. The balancing of the voltage across the two capacitors of the converter and MPPT is achieved using a simple duty cycle based voltage controller. Detailed simulation of three-level DC-DC converter topology with GSS algorithm is carried out in MATLAB/SIMULINK platform. The validation of the proposed system is done by the experiments carried out on hardware prototype of 100 W converter with low cost AT’mega328 controller as a core controller. From the results, the proposed system suits as one of the solutions for PV based generation system and the experimental results show high performance, such as a conversion efficiency of 94%.

Design of 500W Safety Photovoltaic Off-Grid Inverter for Family

2014 ◽  
Vol 651-653 ◽  
pp. 1019-1023
Author(s):  
You Huan Wang ◽  
Ning Liu ◽  
Dong Wei Xia
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Low Cost ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Pv Inverter ◽  
Power Point Tracking ◽  
Converter Topology ◽  
Power Point ◽  
Digital Processor

In order to address and meet the needs of people in these regions without electricity, we designed a small 500W off-grid PV-inverter. The main circuit includes battery charge and discharge circuit, and two-stage converter topology isolated. The digital processor TMS320F28023, high-performance and low-cost, is used to achieve maximum power point tracking (MPPT) of PV modules and charge control for battery. The experimental results of the prototype show that this design with high-precision and high-efficiency, meets the design requirements.

Applicability of the high performance organization (HPO) framework in the Chinese context

2017 ◽  
Vol 8 (1) ◽  
pp. 22-39 ◽  
Author(s):  
André de Waal ◽  
Amy Wang
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Research Question ◽  
Value Added ◽  
Performance Practices ◽  
Content Type ◽  
Chinese Context ◽  
Chinese State ◽  
Asian Context ◽  
High Performance Organization

Purpose In recent years, China has shifted its competitive strategy from competing on low cost to producing higher value added products and services, and the country has made the promotion of business excellence a national strategic priority. As a consequence, Chinese organizations need to know the factors that will make them world-class companies. Until recently, not much research has been done into these factors in the Chinese context. The few studies available unfortunately were mainly done only into specific elements of excellence and specific improvement techniques; a holistic and scientifically validated framework for creating high performance organizations (HPOs) cannot be found. The purpose of this study is to evaluate such a framework, which was quite recently developed, for the Chinese context. Design/methodology/approach A possible way forward is to use the HPO framework which was validated in earlier studies for the Asian context. In this paper, this research question is answered: Can the HPO framework be used to help Chinese organization to evaluate and improve the factors for excellence in the Chinese context? The study used a questionnaire which was distributed to respondents of a Chinese state-owned manufacturing enterprise. The results were discussed during a workshop to arrive at the main attention points for the organization. Findings The HPO framework was validated for the Chinese context and yielded valuable recommendations for improvement for the case company. Originality/value This study fills the gap which currently exists in empirical research about organization performance practices in Chinese. The study also has practical implications as management of Chinese state-owned enterprises, and possibly other Chinese companies, are now able to undertake focused improvement actions.

Mechanical Research with Development of Automatic Handshaking Signal Module for Cross Connecting Cabinet Remote Monitoring Control

2014 ◽  
Vol 540 ◽  
pp. 403-406
Author(s):  
Gin Shan Chen ◽  
Zhi Yuan Chen
Keyword(s):  
Optical Fiber ◽  
High Speed ◽  
High Efficiency ◽  
Low Cost ◽  
Central Office ◽  
Value Added ◽  
Broadband Internet ◽  
Functional Changes ◽  
Fiber To The Home ◽  
Network Transmission

Since the urgent demands for high-speed broadband Internet, facilities originally installed in a unit-central office end are moved to the places close to the users in order to enhance the broadband and overcome the high-frequency attenuation of copper cables, such as cross connecting cabinets (CCC) on streets, and the lines between a unit-central office and CCC are changed to optical fiber cables. Network transmission technology has currently become the generation of optical fiber. To actually promote fiber to the home, the value-added services of high-speed Internet access, VoIP, and multimedia service for users are currently the highlighted telecommunications technology and businesses. Nevertheless, copper cables have been used for a long period of time that it would be costly to completely replace copper cables. Gradually replacing old cables with new ones is considered as the optimal strategy. Without constructing optical fiber lines at different places or completely removing copper cables, Automatic Handshaking Signal Module (AHSM) for a CCC developed in this study is considered economical and simple. It could monitor the signal handshaking through remote control and make structural and functional changes of existing copper-cable cross connecting cabinets for the low-cost and high-efficiency seamless technology transfer.

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