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Synergistic Doping and Intercalation: Realizing Deep Phase Modulation on MoS 2 Arrays for High‐Efficiency Hydrogen Evolution Reaction
Author(s) -
Deng Shengjue,
Luo Mi,
Ai Changzhi,
Zhang Yan,
Liu Bo,
Huang Lei,
Jiang Zheng,
Zhang Qinghua,
Gu Lin,
Lin Shiwei,
Wang Xiuli,
Yu Lei,
Wen Jianguo,
Wang Jiaao,
Pan Guoxiang,
Xia Xinhui,
Tu Jiangping
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201909698
Subject(s) - tafel equation , overpotential , intercalation (chemistry) , materials science , doping , hydrogen , phase (matter) , catalysis , analytical chemistry (journal) , chemistry , electrode , inorganic chemistry , optoelectronics , electrochemistry , organic chemistry , biochemistry , chromatography
A synergistic N doping plus PO 4 3− intercalation strategy is used to induce high conversion (ca. 41 %) of 2H‐MoS 2 into 1T‐MoS 2 , which is much higher than single N doping (ca. 28 %) or single PO 4 3− intercalation (ca. 10 %). A scattering mechanism is proposed to illustrate the synergistic phase transformation from the 2H to the 1T phase, which was confirmed by synchrotron radiation and spherical aberration TEM. To further enhance reaction kinetics, the designed (N,PO 4 3− )‐MoS 2 nanosheets are combined with conductive vertical graphene (VG) skeleton forming binder‐free arrays for high‐efficiency hydrogen evolution reaction (HER). Owing to the decreased band gap, lower d‐band center, and smaller hydrogen adsorption/desorption energy, the designed (N,PO 4 3− )‐MoS 2 /VG electrode shows excellent HER performance with a lower Tafel slope and overpotential than N‐MoS 2 /VG, PO 4 3− ‐MoS 2 /VG counterparts, and other Mo‐base catalysts in the literature.