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

Abstract

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 scalablemore » manufacture of high-performance supercapacitors.« less

Authors:

Pham, Viet Hung  ^[1];

• Search DOE PAGES for author "Pham, Viet Hung"
• Search DOE PAGES for ORCID "0000-0002-2189-7828"

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

• Search DOE PAGES for author "Dickerson, James H."
• Search DOE PAGES for ORCID "0000-0001-9636-6303"

---

+ Show Author Affiliations

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

Publication Date:

Mon Oct 09 00:00:00 EDT 2017

Research Org.:

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

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1433973

Alternate Identifier(s):

OSTI ID: 1564389

Report Number(s):

BNL-203508-2018-JAAM
Journal ID: ISSN 0008-6223

Grant/Contract Number:  

SC0012704

Resource Type:

Accepted Manuscript

Journal Name:

Carbon

Additional Journal Information:

Journal Volume: 126; Journal ID: ISSN 0008-6223

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

25 ENERGY STORAGE; graphene; TiO2; supercapacitor; energy storage