In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 44 ( 2022), p. 23760-23769
Abstract:
The electrochemical nitrate reduction reaction (eNO 3 RRs) can produce value-added chemicals such as ammonia (NH 3 ) via multiple steps. Here, we demonstrate that bimetallic Cu–Pd–O x alloy electrocatalysts can promote selective NH 3 production from the eNO 3 RR, especially at low overpotential, by accelerating the rate-determining hydrogenation of NO 2 − , a critical intermediate, on the Cu catalyst. The synergistic effect of Cu and Pd affords 14 times higher NH 3 yield (1.41 mg h −1 cm −2 ) at −0.2 V RHE with an optimum composition (Cu 0.65 Pd 0.35 O x ) than that obtained using bare CuO x . The operando near edge X-ray absorption fine structure (NEXAFS) and simulation results support that the high hydrogen affinity of Pd facilitates sequential hydrogenation on metallic Cu active sites, consequently increasing the NH 3 selectivity and production rate. Our study sheds light on the mechanism of the catalytic eNO 3 RR and presents a design strategy for more advanced eNO 3 RR electrocatalysts.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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