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Title: Self‐Assembly of Large‐Area 2D Polycrystalline Transition Metal Carbides for Hydrogen Electrocatalysis

Abstract

Abstract Low‐dimensional (0/1/2 dimension) transition metal carbides (TMCs) possess intriguing electrical, mechanical, and electrochemical properties, and they serve as convenient supports for transition metal catalysts. Large‐area single‐crystalline 2D TMC sheets are generally prepared by exfoliating MXene sheets from MAX phases. Here, a versatile bottom‐up method is reported for preparing ultrathin TMC sheets (≈10 nm in thickness and >100 μm in lateral size) with metal nanoparticle decoration. A gelatin hydrogel is employed as a scaffold to coordinate metal ions (Mo 5+ , W 6+ , Co 2+ ), resulting in ultrathin‐film morphologies of diverse TMC sheets. Carbonization of the scaffold at 600 °C presents a facile route to the corresponding MoC x , WC x , CoC x , and to metal‐rich hybrids (Mo 2− x W x C and W/Mo 2 C–Co). Among these materials, the Mo 2 C–Co hybrid provides excellent hydrogen evolution reaction (HER) efficiency (Tafel slope of 39 mV dec −1 and 48 mVj = 10 mA cm‐2 in overpotential in 0.5 m H 2 SO 4 ). Such performance makes Mo 2 C–Co a viable noble‐metal‐free catalyst for the HER, and is competitive with the standard platinum on carbon support. This template‐assisted, self‐assembling, scalable, and low‐costmore » manufacturing process presents a new tactic to construct low‐dimensional TMCs with applications in various clean‐energy‐related fields.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [5];  [5];  [6];  [3];  [7];  [2]; ORCiD logo [8]
  1. Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 USA, Mechanical Engineering University of California Berkley Berkeley CA 94704 USA
  2. State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China
  3. Tsinghua–Berkeley Shenzhen Institute Shenzhen 518055 China
  4. The Molecular Foundry Lawrence Berkeley National Lab Berkeley CA 94704 USA
  5. Mechanical Engineering University of California Berkley Berkeley CA 94704 USA
  6. Advanced Light Source Lawrence Berkeley National Lab Berkeley CA 94704 USA
  7. U.S. Army RDECOM AMRDEC Redstone Arsenal AL 35898 USA
  8. Mechanical Engineering University of California Berkley Berkeley CA 94704 USA, Tsinghua–Berkeley Shenzhen Institute Shenzhen 518055 China
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1479570
Grant/Contract Number:  
DE‐AC02‐05CH11231
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Name: Advanced Materials Journal Volume: 30 Journal Issue: 50; Journal ID: ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Zang, Xining, Chen, Wenshu, Zou, Xiaolong, Hohman, J. Nathan, Yang, Lujie, Li, Buxuan, Wei, Minsong, Zhu, Chenhui, Liang, Jiaming, Sanghadasa, Mohan, Gu, Jiajun, and Lin, Liwei. Self‐Assembly of Large‐Area 2D Polycrystalline Transition Metal Carbides for Hydrogen Electrocatalysis. Germany: N. p., 2018. Web. doi:10.1002/adma.201805188.
Zang, Xining, Chen, Wenshu, Zou, Xiaolong, Hohman, J. Nathan, Yang, Lujie, Li, Buxuan, Wei, Minsong, Zhu, Chenhui, Liang, Jiaming, Sanghadasa, Mohan, Gu, Jiajun, & Lin, Liwei. Self‐Assembly of Large‐Area 2D Polycrystalline Transition Metal Carbides for Hydrogen Electrocatalysis. Germany. https://doi.org/10.1002/adma.201805188
Zang, Xining, Chen, Wenshu, Zou, Xiaolong, Hohman, J. Nathan, Yang, Lujie, Li, Buxuan, Wei, Minsong, Zhu, Chenhui, Liang, Jiaming, Sanghadasa, Mohan, Gu, Jiajun, and Lin, Liwei. Tue . "Self‐Assembly of Large‐Area 2D Polycrystalline Transition Metal Carbides for Hydrogen Electrocatalysis". Germany. https://doi.org/10.1002/adma.201805188.
@article{osti_1479570,
title = {Self‐Assembly of Large‐Area 2D Polycrystalline Transition Metal Carbides for Hydrogen Electrocatalysis},
author = {Zang, Xining and Chen, Wenshu and Zou, Xiaolong and Hohman, J. Nathan and Yang, Lujie and Li, Buxuan and Wei, Minsong and Zhu, Chenhui and Liang, Jiaming and Sanghadasa, Mohan and Gu, Jiajun and Lin, Liwei},
abstractNote = {Abstract Low‐dimensional (0/1/2 dimension) transition metal carbides (TMCs) possess intriguing electrical, mechanical, and electrochemical properties, and they serve as convenient supports for transition metal catalysts. Large‐area single‐crystalline 2D TMC sheets are generally prepared by exfoliating MXene sheets from MAX phases. Here, a versatile bottom‐up method is reported for preparing ultrathin TMC sheets (≈10 nm in thickness and >100 μm in lateral size) with metal nanoparticle decoration. A gelatin hydrogel is employed as a scaffold to coordinate metal ions (Mo 5+ , W 6+ , Co 2+ ), resulting in ultrathin‐film morphologies of diverse TMC sheets. Carbonization of the scaffold at 600 °C presents a facile route to the corresponding MoC x , WC x , CoC x , and to metal‐rich hybrids (Mo 2− x W x C and W/Mo 2 C–Co). Among these materials, the Mo 2 C–Co hybrid provides excellent hydrogen evolution reaction (HER) efficiency (Tafel slope of 39 mV dec −1 and 48 mVj = 10 mA cm‐2 in overpotential in 0.5 m H 2 SO 4 ). Such performance makes Mo 2 C–Co a viable noble‐metal‐free catalyst for the HER, and is competitive with the standard platinum on carbon support. This template‐assisted, self‐assembling, scalable, and low‐cost manufacturing process presents a new tactic to construct low‐dimensional TMCs with applications in various clean‐energy‐related fields.},
doi = {10.1002/adma.201805188},
journal = {Advanced Materials},
number = 50,
volume = 30,
place = {Germany},
year = {Tue Oct 09 00:00:00 EDT 2018},
month = {Tue Oct 09 00:00:00 EDT 2018}
}

Journal Article:
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https://doi.org/10.1002/adma.201805188

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