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나노 구조 물리 연구단
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Synergistic Effects of Nitrogen Doping on MXene for Enhancement of Hydrogen Evolution Reaction

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Title
Synergistic Effects of Nitrogen Doping on MXene for Enhancement of Hydrogen Evolution Reaction
Author(s)
Thi Anh Le; Quoc Viet Bui; Ngoc Quang Tran; Yunhee Cho; Yeseul Hong; Yoshiyuki Kawazoe; Hyoyoung Lee
Publication Date
2019-10
Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING, v.7, no.19, pp.16879 - 16888
Publisher
AMER CHEMICAL SOC
Abstract
© 2019 American Chemical Society.Earth-abundant, nonprecious, and efficient electrocatalysts for effective hydrogen evolution reaction (HER) are crucial for future large-scale green energy production. Low-cost two-dimensional MXenes have been widely studied in energy-storage devices owing to their unique chemical and physical properties and have recently attracted scientists in the electrocatalysis field. Nevertheless, their electrocatalytic activity still remains unsatisfactory. Herein, we present a facile and general strategy using ammonia heat treatment to enhance the hydrogen evolution catalysis of Ti3C2Tx MXenes by modification with a nitrogen heteroatom. Importantly, our approach is focused on revealing: (1) the contribution of all possible incorporated N species including Ti-N, N-H, and N in O-Ti-N, rather than considering only that of Ti-Nx motifs as previously reported for N-doped MXene electrocatalysts, and their role in inducing a change in the electronic configuration of the as-prepared catalysts, which then leads to increased electrical conductivity and improved intrinsic catalytic reactivity; and (2) the importance of controlling the proper amount of N obtained at a suitable calcined temperature to assist the shift of the Gibbs free energy for hydrogen adsorption (Î"Had*) approaching 0 eV (ideal value), as proved by the density functional theory. Moreover, experimental findings indicate that nitrogen-doped Ti3C2Tx annealed at 600 °C shows superior improved HER electrocatalytic performance compared to pristine Ti3C2Tx, with an onset potential of -30 mV and an overpotential as low as 198 at 10 mA cm-2, as well as a much smaller Tafel slope of 92 mV dec-
URI
https://pr.ibs.re.kr/handle/8788114/6415
ISSN
2168-0485
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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