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← ScienceWhich risk increases when attempting electrocatalysis using a nickel-molybdenum catalyst modified with hydrogen?
A)Molybdenum oxide passivation forms readily
B)Hydrogen-induced embrittlement of the electrodes✓
C)Nickel dissolution forms stable chelates
D)Catalyst surface area remains unchanged
💡 Explanation
The electrocatalysis faces risks for hydride embrittlement because hydrogen atoms diffuse into the metal lattice during the hydrogen evolution reaction via the Volmer mechanism, weakening its structural integrity, therefore electrode embrittlement, rather than options that refer to passivation or dissolving.
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