Abstract
A new class of aerogels based exclusively on metal chalcogenide frameworks has been developed, opening up a series of novel properties and applications. Further expanding the application of such chalcogels in electrocatalytic CO2 reduction is of significance for mitigating the rise of atmospheric CO2 concentration. Herein, the tin sulfide chalcogel was employed as a pre-catalyst for the construction of efficient electrocatalysts for CO2 reduction. SnS0.09 and SnS0.55 supported on carbon cloth (SnS0.09/CC and SnS0.55/CC) were obtained with different amounts of sulfur by cyclic voltammetry activation of the tin sulfide chalcogel at different potential intervals. Compared to SnS0.09/CC, SnS0.55/CC with higher S content exhibited higher formate Faraday efficiency of 93.1% at -1.1 V vs. RHE, and the partial current density of formate was 28.4 mA/cm2. The difference in performance between SnS0.09/CC and SnS0.55/CC could be attributed to the varying sulfur which could favor the formation of formate.
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