Hydrogenated TiO2@reduced graphene oxide sandwich-like nanosheets for high voltage supercapacitor applications

Pham, Viet Hung; Nguyen-Phan, Thuy-Duong; Tong, Xiao; Rajagopalan, Balasubramaniyan; Chung, Jin Suk; Dickerson, James H.

doi:10.1016/j.carbon.2017.10.026

Hydrogenated TiO₂@reduced graphene oxide sandwich-like nanosheets for high voltage supercapacitor applications

Journal Article · Mon Oct 09 00:00:00 EDT 2017 · Carbon

DOI:https://doi.org/10.1016/j.carbon.2017.10.026· OSTI ID:1433973

^[1]; Nguyen-Phan, Thuy-Duong ^[2]; Tong, Xiao ^[1]; Rajagopalan, Balasubramaniyan ^[3]; Chung, Jin Suk ^[3]; ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Chemistry
Univ. of Ulsan (Korea, Republic of). School of Chemical Engineering

Hydrogenated TiO₂ has recently attracted considerable attention as potential electrode materials for supercapacitors due to its abundance, low cost, high conductivity, remarkable rate capability, and outstanding long-term cycling stability. In this paper, we demonstrate the synthesis of hydrogenated TiO₂ nanoparticles anchored on reduced graphene oxide nanosheets (HTG) in the form of sandwich-like nanosheet composites. Further, we explored their implementation as electrode materials for high voltage, symmetric supercapacitors, operating in the voltage window of 0–1.8 V. The HTGs were prepared by a sol-gel method, followed by hydrogenation in the temperature range 300–500 °C. Of the prepared composites, HTG prepared at 400 °C exhibited the largest specific capacitance of 51 F g^-1 at the current density of 1.0 A g^-1 and excellent rate capability with 82.5% capacitance retention as the current density increased 40-fold, from 0.5 to 20.0 A g^-1. HTG's excellent rate capability was attributed to its sandwich-like nanostructure, in which ultrasmall hydrogenated TiO₂ nanoparticles densely anchored onto both surfaces of the two-dimensional reduced graphene oxide sheets. Moreover, HTG-based supercapacitors also exhibited long-term cycling stability with the retention over 80% of its initial capacitance after 10,000 cycles. Finally, these properties suggest that HTG is a promising electrode material for the scalable manufacture of high-performance supercapacitors.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1433973

Alternate ID(s):: OSTI ID: 1564389

Report Number(s):: BNL--203508-2018-JAAM

Journal Information:: Carbon, Journal Name: Carbon Vol. 126; ISSN 0008-6223

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Ti‐rich TiO ₂ Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices Qorbani, Mohammad; Khajehdehi, Omid; Sabbah, Amr ChemSusChem, Vol. 12, Issue 17 https://doi.org/10.1002/cssc.201901302	journal	July 2019
In situ preparation of P, O co-doped carbon spheres for high-energy density supercapacitor Ji, Yajun; Deng, Yalei; Wu, Hongmei Journal of Applied Electrochemistry, Vol. 49, Issue 6 https://doi.org/10.1007/s10800-019-01308-z	journal	April 2019
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