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Positive self-reconstruction in an FeNiMo phosphide electrocatalyst for enhanced overall water splitting
- Source :
- Sustainable Energy & Fuels. 5:5789-5797
- Publication Year :
- 2021
- Publisher :
- Royal Society of Chemistry (RSC), 2021.
-
Abstract
- Searching for low-cost and highly active bifunctional electrocatalysts toward hydrogen/oxygen evolution reactions is a grand challenge for water splitting hydrogen production. Herein, we prepare a trimetallic nickel, iron, and molybdenum phosphide (FeNiMoP) grown on nickel foam (NF) via a facile two-step process and employ it as a bifunctional electrocatalyst for full water splitting. In virtue of the superior hydrogen/oxygen evolution activity, the cell with the bifunctional FeNiMoP as both anode and cathode exhibits an initial low cell voltage of 1.50 V at a current density of 10 mA cm−2 in 1.0 M KOH electrolyte solution. Impressively, the full cell voltage decreases to 1.44 V through favorable self-reconstruction on both the anode and cathode during the electrocatalytic overall water splitting process. On the anode side, the FeNiMoP is transformed into FeNiOOH while Mo and P elements are dissolved into the electrolyte. Such transformation leads to a continuously increasing active surface area, and the dissolved Mo forms MoO42− in the electrolyte which improves the OER performance. On the cathode side, the dissolution and re-deposition of Mo oxides on the surface of the electrode greatly increase the active surface sites towards the electrolytes, and the surface absorbed Mo oxides play key roles, leading to a positive effect on HER performance. The new synthesis strategy, taking advantage of favorable structural self-reconstruction in the catalysts can be extended to other catalytic systems.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Phosphide
Oxygen evolution
Energy Engineering and Power Technology
Electrolyte
Electrocatalyst
Cathode
law.invention
Anode
chemistry.chemical_compound
Fuel Technology
chemistry
Chemical engineering
law
Water splitting
Bifunctional
Subjects
Details
- ISSN :
- 23984902
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- Sustainable Energy & Fuels
- Accession number :
- edsair.doi...........c1ee9ade0eba5db4c4da34977f6a798c