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Title: Synergy of Nb doping and surface alloy enhanced on water–alkali electrocatalytic hydrogen generation performance in Ti‐based MXene
Authors: Du, Cheng‐Feng
Sun, Xiaoli
Yu, Hong
Liang, Qinghua
Dinh, Khang Ngoc
Zheng, Yun
Luo, Yubo
Wang, Zhiguo
Yan, Qingyu
Keywords: Doping
DFT Calculation
Issue Date: 2019
Source: Du, C.-F., Sun, X., Yu, H., Liang, Q., Dinh, K. N., Zheng, Y., . . . Yan, Q. (2019). Synergy of Nb doping and surface alloy enhanced on water–alkali electrocatalytic hydrogen generation performance in Ti‐based MXene. Advanced Science, 6(11), 1900116-. doi:10.1002/advs.201900116
Series/Report no.: Advanced Science
Abstract: Presented are the theoretical calculation and experimental studies of a Ti3C2Tx MXene‐based nanohybrid with simultaneous Nb doping and surface transition metal alloy modification. Guided by the density functional theory calculation, the Nb doping can move up the Fermi energy level to the conduction band, thus enhancing the electronic conductivity. Meanwhile, the surface modification by Ni/Co alloy can moderate the surface M–H affinity, which will further enhance the hydrogen evolution reaction (HER) activity. A series of Ni/Co alloy attached on Nb‐doped Ti3C2Tx MXene nanohybrids (denoted as NiCo@NTM) are successfully prepared. As expected, the Ni0.9Co0.1@ NTM nanohybrids present an extraordinary HER activity in alkaline solution, which only needs an overpotential (η) of 43.4 mV to reach the current density of 10 mA cm−2 in 1 m KOH solution and shows good stability. The performance of the Ni0.9Co0.1@ NTM nanohybrids is comparable to the commercial 10% Pt/C electrode (34.4 mV@10 mA cm−2) and is better than most state‐of‐the‐art Pt‐free HER catalysts. Inspired by the facile synthesis process and chemical versatility of both MXene and transition metal alloys, the nanohybrids reported here are promising non‐noble metal electrocatalysts for water–alkali electrolysis.
DOI: 10.1002/advs.201900116
Rights: © 2019 The Author(s). Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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