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High performance tellurium-reduced graphene oxide pseudocapacitor electrodes
We report on facile preparation of Tellurium (Te)-reduced graphene oxide (rGO) electrodes for evaluation of electrochemical parameters. Initially, Te (0.5–11w/w %) was, in-situ, incorporated while reduction of graphene oxide. In material analysis, 1% Te optimised C/O ratio by rearrangement of C(O)O,...
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Published in: | Electrochimica acta 2018-11, Vol.291, p.225-233 |
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description | We report on facile preparation of Tellurium (Te)-reduced graphene oxide (rGO) electrodes for evaluation of electrochemical parameters. Initially, Te (0.5–11w/w %) was, in-situ, incorporated while reduction of graphene oxide. In material analysis, 1% Te optimised C/O ratio by rearrangement of C(O)O, separating oxygen from graphene plane, and self-oxidation. TeO bridging acted as an ideal strain buffer that modified nature of conjugation, folding, and exfoliated rGO sheets advantageous for pseudo-capacitive action. Electrochemical analysis, showed substantial increase in specific capacitance, Csp(@5 mV/s), for 1% Te-rGO, to 460 F/g from base rGO (270 F/g) with increase in charge-discharge time (CD@0.5A/g) 15 (rGO) to 100 s (Te-rGO). For two electrodes, CV (285 F/g @ 5 mV/s) and CD (260 F/g @0.25A/g) data was in well agreement with greatest CD ∼ 250 s for (1%). The CD time was retarded by a factor of six in both electrode studies, at 1%. The estimated energy, ED(Wh/kg), and power density, PD (W/kg), indicated that, both electrodes were at the interface of battery and electrode double layer capacitor (EDLC) region on Ragone plane. However, 1%Te-rGO at low PD(250) and high ED (8) have battery-like behaviour, whereas, at high PD (1002) and low ED(5) showed pseudo-capacitive action. Investigations on Nyquist, ac complex capacitance (Bode), and phase plots quantified contribution of impedances offered by surface, interface (electrolyte/active electrode/collector), charge transfer, and ions. Te-rGO showed excellent cycle stability 100% even after 2500 cycles @ 1A/g. By and large, 1% Te showed superior pseudo capacitive performance compared over high Te % and base rGO.
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doi_str_mv | 10.1016/j.electacta.2018.09.116 |
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[Display omitted]</description><subject>Alternative energy</subject><subject>Batteries</subject><subject>Battery-like behaviour</subject><subject>Capacitance</subject><subject>Charge transfer</subject><subject>Conjugation</subject><subject>Electrochemical analysis</subject><subject>Electrodes</subject><subject>Graphene</subject><subject>Ion migration</subject><subject>Limiting capacitance</subject><subject>Oxidation</subject><subject>Pseudo-capacitance action</subject><subject>Renewable energy</subject><subject>Specific capacitance</subject><subject>Te-rGO</subject><subject>Tellurium</subject><issn>0013-4686</issn><issn>1873-3859</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqFkN9LwzAQx4MoOKd_gwWfWy9Nl6SPY6gTBr7oc0iT65bSLTVpRf97Mye-Cgf38v1x9yHklkJBgfL7rsAezajTFCVQWUBdUMrPyIxKwXImF_U5mQFQlldc8ktyFWMHAIILmJHN2m132YCh9WGvDwazEft-Cm7a5wHtZNBm26CHHR4w85_OYjZEnKw3etDGjT5kP_XBW4zX5KLVfcSb3z0nb48Pr6t1vnl5el4tN7lhEsacIjOSmbbiRghhmwXjDZQWGNeW17QSDUODlU3XaqpN1bZaoxSlXjDEhls2J3en3CH49wnjqDo_hUOqVCVlVLKyLllSiZPKBB9jwFYNwe11-FIU1BGd6tQfOnVEp6BWCV1yLk9OTE98OAwqGocJjnUh6ZX17t-Mb6lgfbs</recordid><startdate>20181120</startdate><enddate>20181120</enddate><creator>Alegaonkar, Ashwini P.</creator><creator>Mahadadalkar, Manjiri A.</creator><creator>Alegaonkar, Prashant S.</creator><creator>Kale, Bharat B.</creator><creator>Pardeshi, Satish K.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20181120</creationdate><title>High performance tellurium-reduced graphene oxide pseudocapacitor electrodes</title><author>Alegaonkar, Ashwini P. ; Mahadadalkar, Manjiri A. ; Alegaonkar, Prashant S. ; Kale, Bharat B. ; Pardeshi, Satish K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c380t-1e3c83cf46c777db536b02d036ad69147b3ece4d686a1ac4ffaae872a53eeb6d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Alternative energy</topic><topic>Batteries</topic><topic>Battery-like behaviour</topic><topic>Capacitance</topic><topic>Charge transfer</topic><topic>Conjugation</topic><topic>Electrochemical analysis</topic><topic>Electrodes</topic><topic>Graphene</topic><topic>Ion migration</topic><topic>Limiting capacitance</topic><topic>Oxidation</topic><topic>Pseudo-capacitance action</topic><topic>Renewable energy</topic><topic>Specific capacitance</topic><topic>Te-rGO</topic><topic>Tellurium</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Alegaonkar, Ashwini P.</creatorcontrib><creatorcontrib>Mahadadalkar, Manjiri A.</creatorcontrib><creatorcontrib>Alegaonkar, Prashant S.</creatorcontrib><creatorcontrib>Kale, Bharat B.</creatorcontrib><creatorcontrib>Pardeshi, Satish K.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Electrochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Alegaonkar, Ashwini P.</au><au>Mahadadalkar, Manjiri A.</au><au>Alegaonkar, Prashant S.</au><au>Kale, Bharat B.</au><au>Pardeshi, Satish K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High performance tellurium-reduced graphene oxide pseudocapacitor electrodes</atitle><jtitle>Electrochimica acta</jtitle><date>2018-11-20</date><risdate>2018</risdate><volume>291</volume><spage>225</spage><epage>233</epage><pages>225-233</pages><issn>0013-4686</issn><eissn>1873-3859</eissn><abstract>We report on facile preparation of Tellurium (Te)-reduced graphene oxide (rGO) electrodes for evaluation of electrochemical parameters. Initially, Te (0.5–11w/w %) was, in-situ, incorporated while reduction of graphene oxide. In material analysis, 1% Te optimised C/O ratio by rearrangement of C(O)O, separating oxygen from graphene plane, and self-oxidation. TeO bridging acted as an ideal strain buffer that modified nature of conjugation, folding, and exfoliated rGO sheets advantageous for pseudo-capacitive action. Electrochemical analysis, showed substantial increase in specific capacitance, Csp(@5 mV/s), for 1% Te-rGO, to 460 F/g from base rGO (270 F/g) with increase in charge-discharge time (CD@0.5A/g) 15 (rGO) to 100 s (Te-rGO). For two electrodes, CV (285 F/g @ 5 mV/s) and CD (260 F/g @0.25A/g) data was in well agreement with greatest CD ∼ 250 s for (1%). The CD time was retarded by a factor of six in both electrode studies, at 1%. The estimated energy, ED(Wh/kg), and power density, PD (W/kg), indicated that, both electrodes were at the interface of battery and electrode double layer capacitor (EDLC) region on Ragone plane. However, 1%Te-rGO at low PD(250) and high ED (8) have battery-like behaviour, whereas, at high PD (1002) and low ED(5) showed pseudo-capacitive action. Investigations on Nyquist, ac complex capacitance (Bode), and phase plots quantified contribution of impedances offered by surface, interface (electrolyte/active electrode/collector), charge transfer, and ions. Te-rGO showed excellent cycle stability 100% even after 2500 cycles @ 1A/g. By and large, 1% Te showed superior pseudo capacitive performance compared over high Te % and base rGO.
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subjects | Alternative energy Batteries Battery-like behaviour Capacitance Charge transfer Conjugation Electrochemical analysis Electrodes Graphene Ion migration Limiting capacitance Oxidation Pseudo-capacitance action Renewable energy Specific capacitance Te-rGO Tellurium |
title | High performance tellurium-reduced graphene oxide pseudocapacitor electrodes |
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