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      Reducing and Uniforming the Co 3 O 4 Particle Size by Sulfonated Graphenal Polymers for Electrochemical Applications

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          Abstract

          A novel two-dimensional (2D) nanomaterial, namely sulfonated graphenal polymer (SGP), is used to tune the hydrothermal growth of Co 3O 4 nanoparticles. SGP provides abundant nucleation sites to grow Co 3O 4 nanoparticles and effectively reduces the particle size and dimension. As a result, with considering the improved size uniformity of Co 3O 4 and the tight wrapping of SGP around Co 3O 4 as well, the Co 3O 4/SGP hybrid electrode exhibits a high specific electrochemical capacitance of 234.28 F/g at a current density of 0.2 A/g, 237% higher than that of the pure Co 3O 4 electrode. By using the hybrid as the anode of an all-solid-state asymmetric supercapacitor, the capacitance can be well maintained up to 93% after 5000 cycles even at 2 A/g.

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          Materials science. Electrochemical capacitors for energy management.

          John Miller, Patrice Simon (2008)
          Article 0 comments Cited 969 times – based on 0 reviews     Review now
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            Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage.

            Maher F El-Kady, Richard B Kaner (2013)
            The rapid development of miniaturized electronic devices has increased the demand for compact on-chip energy storage. Microscale supercapacitors have great potential to complement or replace batteries and electrolytic capacitors in a variety of applications. However, conventional micro-fabrication techniques have proven to be cumbersome in building cost-effective micro-devices, thus limiting their widespread application. Here we demonstrate a scalable fabrication of graphene micro-supercapacitors over large areas by direct laser writing on graphite oxide films using a standard LightScribe DVD burner. More than 100 micro-supercapacitors can be produced on a single disc in 30 min or less. The devices are built on flexible substrates for flexible electronics and on-chip uses that can be integrated with MEMS or CMOS in a single chip. Remarkably, miniaturizing the devices to the microscale results in enhanced charge-storage capacity and rate capability. These micro-supercapacitors demonstrate a power density of ~200 W cm-3, which is among the highest values achieved for any supercapacitor.
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              Co3O4 Nanocrystals on Graphene as a Synergistic Catalyst for Oxygen Reduction Reaction

              Jigang Zhou, Yongye Liang, Tom Regier … (2011)
              Catalysts for oxygen reduction and evolution reactions are at the heart of key renewable energy technologies including fuel cells and water splitting. Despite tremendous efforts, developing oxygen electrode catalysts with high activity at low costs remains a grand challenge. Here, we report a hybrid material of Co3O4 nanocrystals grown on reduced graphene oxide (GO) as a high-performance bi-functional catalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). While Co3O4 or graphene oxide alone has little catalytic activity, their hybrid exhibits an unexpected, surprisingly high ORR activity that is further enhanced by nitrogen-doping of graphene. The Co3O4/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions. The same hybrid is also highly active for OER, making it a high performance non-precious metal based bi-catalyst for both ORR and OER. The unusual catalytic activity arises from synergetic chemical coupling effects between Co3O4 and graphene.
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                Author and article information

                Contributors
                Xiaohua Zhang:
                ORCID: http://orcid.org/0000-0001-9008-791X
                zhangxhcm@gmail.com
                Journal
                Journal ID (nlm-ta): Nanoscale Res Lett
                Journal ID (iso-abbrev): Nanoscale Res Lett
                Title: Nanoscale Research Letters
                Publisher: Springer US (New York )
                ISSN (Print): 1931-7573
                ISSN (Electronic): 1556-276X
                Publication date (Electronic): 4 March 2017
                Publication date PMC-release: 4 March 2017
                Publication date Collection: 2017
                Volume: 12
                Electronic Location Identifier: 165
                Affiliations
                [1 ]ISNI 0000 0001 2323 5732, GRID grid.39436.3b, Department of Chemistry, College of Sciences, , Shanghai University, ; Shanghai, 200444 China
                [2 ]ISNI 0000000119573309, GRID grid.9227.e, Suzhou Institute of Nano-Tech and Nano-Bionics, , Chinese Academy of Sciences, ; Suzhou, 215123 China
                [3 ]ISNI 0000 0000 9188 055X, GRID grid.267139.8, School of Energy and Power Engineering, , University of Shanghai for Science and Technology, ; Shanghai, 200093 China
                Author information
                http://orcid.org/0000-0001-9008-791X
                Article
                Publisher ID: 1953
                DOI: 10.1186/s11671-017-1953-8
                PMC ID: 5336442
                PubMed ID: 28269971
                SO-VID: 248ce0f8-f332-4e85-b797-9519807043fd
                Copyright © © The Author(s) 2017
                License:

                Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

                History
                Date received : 15 November 2016
                Date accepted : 26 February 2017
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100001809, National Natural Science Foundation of China;
                Award ID: 11302241
                Award Recipient :
                Funded by: FundRef http://dx.doi.org/10.13039/501100001809, National Natural Science Foundation of China;
                Award ID: 11404371
                Funded by: FundRef http://dx.doi.org/10.13039/501100001809, National Natural Science Foundation of China;
                Award ID: 51561145008
                Award Recipient :
                Funded by: Youth Foundation of Natural Science Foundation of Jiangsu Province
                Award ID: BK20140390
                Funded by: FundRef http://dx.doi.org/10.13039/501100004739, Youth Innovation Promotion Association of the Chinese Academy of Sciences;
                Award ID: 2015256
                Award Recipient :
                Funded by: National Key Research and Development Program of China
                Award ID: 2016YFA0203301
                Categories
                Subject: Nano Express
                Custom metadata
                issue-copyright-statement © The Author(s) 2017

                ScienceOpen disciplines: Nanomaterials
                Keywords: sulfonated graphenal polymer,cobalt oxide,hydrothermal growth,electrochemical
                Data availability:
                ScienceOpen disciplines: Nanomaterials
                Keywords: sulfonated graphenal polymer, cobalt oxide, hydrothermal growth, electrochemical

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