W-induced morphological modification of NiFe layered double hydroxides as efficient electrocatalysts for overall water splitting
Journal Article
·
· Electrochimica Acta
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Layered double hydroxides (LDHs) are one of the most efficient electrocatalysts for water splitting due to their nanosheet features and compositional flexibilities. This work explored the impact of W precursor concentration (0 ~ 10 mM) on LDH morphologies and performance in hydrogen production. Using an electrodeposition W-doping process, W-induced NiFe LDHs (NiFeW-LDHs) were in-situ grown on carbon fiber papers for water splitting. A performance peak was found at a W doping of 5 mM with well-aligned nanosheets, which not only boosted the charge transfer ability and gas evolution but also offered more than a four-fold electrochemical surface area increase compared to film-like NiFe hydroxides. The NiFeW-LDHs exhibited remarkable performance compared to NiFe hydroxides, showing decreased overpotentials of 31 mV and 114 mV for the oxygen evolution reactions (OERs) and hydrogen evolution reactions (HERs) at 10 mA/cm2 and -10 mA/cm2, respectively, in alkaline media. The performance enhancement at 5 mM W-doping was linked to the well-aligned NiFeW-LDH nanosheets; smaller, less-textured nanosheets were observed with lower or higher W precursor concentrations (2.5 mM or >7.5 mM), leading to inferior OER and HER performances. Hence, an appropriate W doping is crucial to generating the morphologies that contribute to the higher performance of NiFeW-LDHs.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office
- Grant/Contract Number:
- AC05-00OR22725; EE0008423; EE0008426; FE0011585
- OSTI ID:
- 1821979
- Alternate ID(s):
- OSTI ID: 1819964
- Journal Information:
- Electrochimica Acta, Journal Name: Electrochimica Acta Journal Issue: 1 Vol. 395; ISSN 0013-4686
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Constructing Ultrathin W-Doped NiFe Nanosheets via Facile Electrosynthesis as Bifunctional Electrocatalysts for Efficient Water Splitting
Integrating Rh Species with NiFe-Layered Double Hydroxide for Overall Water Splitting
Cobalt Intercalated Layered NiFe Double Hydroxides for the Oxygen Evolution Reaction
Journal Article
·
Sun Apr 25 20:00:00 EDT 2021
· ACS Applied Materials and Interfaces
·
OSTI ID:1817450
Integrating Rh Species with NiFe-Layered Double Hydroxide for Overall Water Splitting
Journal Article
·
Tue Nov 26 19:00:00 EST 2019
· Nano Letters
·
OSTI ID:1603279
Cobalt Intercalated Layered NiFe Double Hydroxides for the Oxygen Evolution Reaction
Journal Article
·
Wed Sep 06 20:00:00 EDT 2017
· Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
·
OSTI ID:1418038