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      3D‐Printed Structure Boosts the Kinetics and Intrinsic Capacitance of Pseudocapacitive Graphene Aerogels

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          Abstract

          <p class="first" id="d3320565e177">The performance of pseudocapacitive electrodes at fast charging rates are typically limited by the slow kinetics of Faradaic reactions and sluggish ion diffusion in the bulk structure. This is particularly problematic for thick electrodes and electrodes highly loaded with active materials. Here, a surface-functionalized 3D-printed graphene aerogel (SF-3D GA) is presented that achieves not only a benchmark areal capacitance of 2195 mF cm-2 at a high current density of 100 mA cm-2 but also an ultrahigh intrinsic capacitance of 309.1 µF cm-2 even at a high mass loading of 12.8 mg cm-2 . Importantly, the kinetic analysis reveals that the capacitance of SF-3D GA electrode is primarily (93.3%) contributed from fast kinetic processes. This is because the 3D-printed electrode has an open structure that ensures excellent coverage of functional groups on carbon surface and facilitates the ion accessibility of these surface functional groups even at high current densities and large mass loading/electrode thickness. An asymmetric device assembled with SF-3D GA as anode and 3D-printed GA decorated with MnO2 as cathode achieves a remarkable energy density of 0.65 mWh cm-2 at an ultrahigh power density of 164.5 mW cm-2 , outperforming carbon-based supercapacitors operated at the same power density. </p>

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          Author and article information

          Contributors
          Journal
          Advanced Materials
          Adv. Mater.
          Wiley
          0935-9648
          1521-4095
          January 19 2020
          February 2020
          January 17 2020
          February 2020
          : 32
          : 8
          : 1906652
          Affiliations
          [1 ]Department of Chemistry and BiochemistryUniversity of California Santa Cruz CA 95064 USA
          [2 ]Lawrence Livermore National Laboratory 7000 East Avenue Livermore CA 94550 USA
          [3 ]MOE of the Key Laboratory of Bioinorganic and Synthetic ChemistryThe Key Lab of Low‐Carbon Chemistry &amp; Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat‐Sen University Guangzhou 510275 P. R. China
          [4 ]State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of Technology Wuhan 430070 P. R. China
          Article
          10.1002/adma.201906652
          31951066
          a8437d9a-6e51-47ce-b0a3-fe6c7e460dbb
          © 2020

          http://creativecommons.org/licenses/by-nc/4.0/

          http://creativecommons.org/licenses/by-nc/4.0/

          http://doi.wiley.com/10.1002/tdm_license_1.1

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