{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Sanni A"],"funding":["Korea Basic Science Institute","Thailand Science Research and Innovation","Program Management Unit for Human Resources and Institutional Development, Research, and Innovation","Chulalongkorn University","National Research Foundation of Korea","Council for Science, Technology and Innovation"],"pagination":["46936-46951"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC12371695"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["17(33)"],"pubmed_abstract":["Despite their critical importance, developing sustainable high-performance supercapacitor (SC) electrodes with long-term stability poses significant challenges. Herein, we report a novel ternary composite electrode in which Ag/Ni-doped manganese oxide (Ag/NiO<sub><i>x</i></sub>@Mn<sub><i>y</i></sub>O<sub><i>z</i></sub>) is supported on human hair-derived activated carbon (HHC). This composite is synthesized via a one-pot hydrothermal process followed by thermal annealing at 800 °C, a strategy that creates a conductive Ag/Ni bimetallic network and abundant oxygen vacancies in the NiO<sub><i>x</i></sub> and Mn<sub><i>y</i></sub>O<sub><i>z</i></sub> phases. During operation, operando X-ray absorption spectroscopy (XAS) confirms reversible dual-ion redox transitions (Mn<sup>2+</sup>/Mn<sup>3+</sup> and Ni<sup>0</sup>/Ni<sup>2+</sup>) in the cathode, highlighting the material's enhanced redox activity. As a result, HHC-supported Ag/NiO<sub><i>x</i></sub>@Mn<sub><i>y</i></sub>O<sub><i>z</i></sub> exhibits an exceptional specific capacitance (Cs) of 1770 F g<sup>-1</sup> at 5 mV s<sup>-1</sup> in three-electrode tests. When assembled into an asymmetric hybrid supercapacitor (AHSC), the device delivers a high energy density of 37.53 Wh kg<sup>-1</sup> and a power density of 2251.8 W kg<sup>-1</sup> at 3 A g<sup>-1</sup> while retaining ∼82% of its initial capacitance after 5000 charge-discharge cycles. These results confirm the effectiveness of our sustainable HHC-supported Ag/NiO<sub><i>x</i></sub>@Mn<sub><i>y</i></sub>O<sub><i>z</i></sub> framework in addressing the enduring trade-off between energy density, power density, and cycling stability in next-generation SCs."],"journal":["ACS applied materials & interfaces"],"pubmed_title":["Elucidating Mn&lt;sup&gt;2+&lt;/sup&gt;/Mn&lt;sup&gt;3+&lt;/sup&gt; and Ni&lt;sup&gt;0&lt;/sup&gt;/Ni&lt;sup&gt;2+&lt;/sup&gt; Redox Synergy in Hair-Derived Carbon-Supported Ag/Ni-MnO&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; Supercapacitor."],"pmcid":["PMC12371695"],"funding_grant_id":["2022R1A2C2010686","IND_FF_68_169_2100_028","RS-2024-00434932","B49G680109","JPJ012307"],"pubmed_authors":["Sanni A","Govindarajan D","Tipplook M","Kao-Ian W","Teshima K","Choi MY","Kheawhom S","Theerthagiri J","Limphirat W"],"additional_accession":[]},"is_claimable":false,"name":"Elucidating Mn&lt;sup&gt;2+&lt;/sup&gt;/Mn&lt;sup&gt;3+&lt;/sup&gt; and Ni&lt;sup&gt;0&lt;/sup&gt;/Ni&lt;sup&gt;2+&lt;/sup&gt; Redox Synergy in Hair-Derived Carbon-Supported Ag/Ni-MnO&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; Supercapacitor.","description":"Despite their critical importance, developing sustainable high-performance supercapacitor (SC) electrodes with long-term stability poses significant challenges. Herein, we report a novel ternary composite electrode in which Ag/Ni-doped manganese oxide (Ag/NiO<sub><i>x</i></sub>@Mn<sub><i>y</i></sub>O<sub><i>z</i></sub>) is supported on human hair-derived activated carbon (HHC). This composite is synthesized via a one-pot hydrothermal process followed by thermal annealing at 800 °C, a strategy that creates a conductive Ag/Ni bimetallic network and abundant oxygen vacancies in the NiO<sub><i>x</i></sub> and Mn<sub><i>y</i></sub>O<sub><i>z</i></sub> phases. During operation, operando X-ray absorption spectroscopy (XAS) confirms reversible dual-ion redox transitions (Mn<sup>2+</sup>/Mn<sup>3+</sup> and Ni<sup>0</sup>/Ni<sup>2+</sup>) in the cathode, highlighting the material's enhanced redox activity. As a result, HHC-supported Ag/NiO<sub><i>x</i></sub>@Mn<sub><i>y</i></sub>O<sub><i>z</i></sub> exhibits an exceptional specific capacitance (Cs) of 1770 F g<sup>-1</sup> at 5 mV s<sup>-1</sup> in three-electrode tests. When assembled into an asymmetric hybrid supercapacitor (AHSC), the device delivers a high energy density of 37.53 Wh kg<sup>-1</sup> and a power density of 2251.8 W kg<sup>-1</sup> at 3 A g<sup>-1</sup> while retaining ∼82% of its initial capacitance after 5000 charge-discharge cycles. These results confirm the effectiveness of our sustainable HHC-supported Ag/NiO<sub><i>x</i></sub>@Mn<sub><i>y</i></sub>O<sub><i>z</i></sub> framework in addressing the enduring trade-off between energy density, power density, and cycling stability in next-generation SCs.","dates":{"release":"2025-01-01T00:00:00Z","publication":"2025 Aug","modification":"2026-05-08T06:49:00.364Z","creation":"2026-04-07T23:31:10.689Z"},"accession":"S-EPMC12371695","cross_references":{"pubmed":["40696782"],"doi":["10.1021/acsami.5c07064"]}}