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In Operando Stacking of Reduced Graphene Oxide for Active Hydrogen Evolution

Title
In Operando Stacking of Reduced Graphene Oxide for Active Hydrogen Evolution
Authors
Ling, NingWang, ZhenKim, SeraOh, Sang HoPark, Jong HyeokShin, HyunjungCho, SuyeonYang, Heejun
Ewha Authors
조수연
SCOPUS Author ID
조수연scopus
Issue Date
2019
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link

1944-8252JCR Link
Citation
ACS APPLIED MATERIALS & INTERFACES vol. 11, no. 46, pp. 43460 - 43465
Keywords
hydrogen evolution reactionhydrogen bubble templatereduced graphene oxidemetal-free catalystin operando stacking
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Document Type
Article
Abstract
Despite the remarkable electronic and mechanical properties of graphene, improving the catalytic activity of the atomically flat, inert, and stable carbon network remains a challenging issue in both fundamental and application studies. In particular, the adsorption of most molecules and ions, including hydrogen (H-2 or H+), on graphene is not favorable, underlining the challenge for an efficient electrochemical catalytic reaction on graphene. Various defects, edges, and functionalization have been suggested to resolve the catalytic issue in graphene, but cost-effectiveness and active catalysis with graphene have not been achieved yet. Here, we introduce dynamic stacking of reduced graphene oxide (rGO) with spontaneously generated hydrogen bubbles to form an efficient electrochemical catalyst with a graphene derivative; the in operando stacking of rGO, without using a high-temperature-based heteroatom doping process or plasma treatment, creates a large catalytic surface area with optimized edges and acidic groups in the rGO. Thus, the uniquely formed stable carbon network achieves active hydrogen evolution with a Tafel slope of 39 mV.dec(-1) and a double layer capacitance of 12.41 mF.cm(-2), which breaks the conventional limit of graphene-based catalysis, suggesting a promising strategy for metal-free catalyst engineering and hydrogen production.
DOI
10.1021/acsami.9b11619
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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