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Volume 3, Issue 1, Pages (July 2017)

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1 Volume 3, Issue 1, Pages 122-133 (July 2017)
In Situ Electrochemical Production of Ultrathin Nickel Nanosheets for Hydrogen Evolution Electrocatalysis  Chengyi Hu, Qiuyu Ma, Sung-Fu Hung, Zhe-Ning Chen, Daohui Ou, Bin Ren, Hao Ming Chen, Gang Fu, Nanfeng Zheng  Chem  Volume 3, Issue 1, Pages (July 2017) DOI: /j.chempr Copyright © 2017 Elsevier Inc. Terms and Conditions

2 Chem 2017 3, DOI: ( /j.chempr ) Copyright © 2017 Elsevier Inc. Terms and Conditions

3 Figure 1 Structural and Compositional Characterizations of Ni-BDT NSs
(A–C) SEM image (A), TEM image (B), and EDS and elemental mapping images (C) of Ni-BDT. (D) Raman spectra of BDT and Ni-BDT. Inset: chemical structure of BDT. (E and F) Ni K-edge XANES (E) and EXAFS (F) spectra of Ni-BDT and Ni(OH)2. Chem 2017 3, DOI: ( /j.chempr ) Copyright © 2017 Elsevier Inc. Terms and Conditions

4 Figure 2 In Situ Electrochemical Activation and HER Performance of Ni-BDT NSs (A) Chronopotentiometry at a constant cathodic current density of 20 mA cm−2 of Ni-BDT. Inset: linear sweep voltammetry (LSV) of Ni-BDT at the first and thousandth cycles. (B) LSV of Ni(OH)2, Ni-BDT, Ni-BDT-A, and Pt/C on a carbon cloth electrode in 1 M KOH (iR corrected). (C) Tafel plots of the polarization curves in (B). (D) Double-layer capacitance of Ni(OH)2, Ni-BDT, and Ni-BDT-A. Chem 2017 3, DOI: ( /j.chempr ) Copyright © 2017 Elsevier Inc. Terms and Conditions

5 Figure 3 Structural and Compositional Characterizations of Ni-BDT NSs after Electrochemical Activation (A–C) SEM image (A), TEM image (B), and EDS and elemental mapping images (C) of Ni-BDT-A. (D) XPS spectra of the Ni 2p3/2 region of Ni-BDT, Ni-BDT-A, and Ni-BDT-A sputtered by Ar ions. Chem 2017 3, DOI: ( /j.chempr ) Copyright © 2017 Elsevier Inc. Terms and Conditions

6 Figure 4 Identification of the HER Active Site by Electrochemical In Situ XAS (A and B) XANES (A) and EXAFS (B) spectra of Ni foil and Ni-BDT before and after electrochemical activation. (C) Schematic illustration of the synthesis of Ni-BDT and in situ electrochemical production of Ni NSs with Sadδ−. Chem 2017 3, DOI: ( /j.chempr ) Copyright © 2017 Elsevier Inc. Terms and Conditions


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