Journal
ACS CATALYSIS
Volume 9, Issue 9, Pages 8520-8528Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b01616
Keywords
borohydride oxidation reaction (BOR); direct borohydride fuel cell (DBFC); nickel; platinum; palladium; density functional theory (DFT)
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Funding
- French National Research Agency (ANR) [ANR-16-CE05-0009-01]
- Russian Science Foundation [18-73-00143]
- Centre of Excellence of Multifunctional Architectured Materials CEMAM [ANR-10-LABX-44-01]
- Russian Science Foundation [18-73-00143] Funding Source: Russian Science Foundation
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Developing cost-effective electrocatalysts for the multielectron borohydride oxidation reaction (BOR) is mandatory to deploy direct borohydride fuel cell (DBFC) systems to power portable and mobile devices. Currently, DBFCs rely on noble metal electrocatalysts and are not capable of fully profiting from the high theoretical DBFC voltage due to the competing hydrogen evolution reaction. Here, highly efficient noble metal-free BOR electrocatalysts based on carbon-supported Ni nanoparticles considerably outperform Pt/C at overpotentials as low as 0.2 V, both in half-cell and in unit fuel cell configurations. Precise control of the oxidation state of surface Ni determines the electrocatalytic activity. Density functional theory (DFT) calculations ascribe the significant activity of Ni compared to Pt, Pd, or Au to a better balance in the adsorption energies of H-ad, OHad, and B-containing reactive intermediates. These findings suggest design principles for efficient noble metal-free BOR electrocatalysts for DBFCs.
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