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

Journal Article · · Advanced Materials
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

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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐AC02‐05CH11231
OSTI ID:
1479570
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Vol. 30 Journal Issue: 50; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 92 works
Citation information provided by
Web of Science

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