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Title: Laser-sculptured ultrathin transition metal carbide layers for energy storage and energy harvesting applications

Journal Article · · Nature Communications
 [1];  [2];  [2];  [3];  [4]; ORCiD logo [5];  [5];  [6]; ORCiD logo [7]; ORCiD logo [2];  [5]; ORCiD logo [8];  [5];  [5]; ORCiD logo [5];  [7];  [9]; ORCiD logo [2];  [5]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of California, Berkeley, CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of Houston, TX (United States)
  4. Shenzhen Univ. (China)
  5. Univ. of California, Berkeley, CA (United States)
  6. D-MAVT, ETHZ, Zürich (Switzerland)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Harvard Univ., Cambridge, MA (United States)
  9. Aviation and Missile Center, Redstone Arsenal, AL (United States)

Ultrathin transition metal carbides with high capacity, high surface area, and high conductivity are a promising family of materials for applications from energy storage to catalysis. However, large-scale, cost-effective, and precursor-free methods to prepare ultrathin carbides are lacking. Here, we demonstrate a direct pattern method to manufacture ultrathin carbides (MoCx, WCx, and CoCx) on versatile substrates using a CO2 laser. The laser-sculptured polycrystalline carbides (macroporous, ~10-20 nm wall thickness, ~10 nm crystallinity) show high energy storage capability, hierarchical porous structure, and higher thermal resilience than MXenes and other laser-ablated carbon materials. A flexible supercapacitor made of MoCx demonstrates a wide temperature range (-50 to 300 °C). Furthermore, the sculptured microstructures endow the carbide network with enhanced visible light absorption, providing high solar energy harvesting efficiency (~72%) for steam generation. The laser-based, scalable, resilient, and low-cost manufacturing process presents an approach for construction of carbides and their subsequent applications.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1559234
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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La 3+ :Ni–Cl oxyhydroxide gels with enhanced electroactivity as positive materials for hybrid supercapacitors journal January 2020