期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 46, 页码 55040-55050出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c16284
关键词
POMs; electrocatalytic nitrogen reduction reaction; bimetallic hybrid material; iron foam; electrocatalyst
资金
- Major Research Plan National Natural Science Foundation of China [92061102]
- National Science Foundation of China [22171059]
- Outstanding Youth Project of Natural Science Foundation in Heilongjiang Province [YQ2020B005]
- Opening Foundation of Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University, Ministry of Education)
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT2018213]
Efficient FeS2-MoS2 bimetallic hybrid materials were synthesized as electrocatalysts for electrochemical nitrogen reduction reaction, showing unique 3D porous structure and remarkable NH3 production rate.
Highly efficient catalysts with enough selectivity and stability are essential for electrochemical nitrogen reduction reaction (e-NRR) that has been considered as a green and sustainable route for synthesis of NH3. In this work, a series of three-dimensional (3D) porous iron foam (abbreviated as IF) self-supported FeS2-MoS2 bimetallic hybrid materials, denoted as FeS2-MoS2@IFx, x = 100, 200, 300, and 400, were designed and synthesized and then directly used as the electrode for the NRR. Interestingly, the IF serving as a slow-releasing iron source together with polyoxomolybdates (NH4)(6)Mo7O24 center dot 4H(2)O as a Mo source were sulfurized in the presence of thiourea to form self-supported FeS2-MoS2 on IF (abbreviated as FeS2-MoS2@IF200) as an efficient electrocatalyst. Further material characterizations of FeS2-MoS2@IF200 show that flower cluster-like FeS2-MoS2 grows on the 3D skeleton of IF, consisting of interconnected and staggered nanosheets with mesoporous structures. The unique 3D porous structure of FeS2-MoS2@IF together with synergy and interface interactions of bimetallic sulfides would make FeS2-MoS2@IF possess favorable electron transfer tunnels and expose abundant intrinsic active sites in the e-NRR. It is confirmed that synthesized FeS2-MoS2@IF200 shows a remarkable NH3 production rate of 7.1 x10(-10) mol s(-1) cm(-2) at -0.5 V versus the reversible hydrogen electrode (vs RHE) and an optimal faradaic efficiency of 4.6% at -0.3 V (vs RHE) with outstanding electrochemical and structural stability.
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