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Article Abstract
Efficient catalysts are highly desirable for the selective electrochemical CO reduction reaction (CORR). Ni single-atom catalysts are known as promising CORR catalysts, while Ni NPs are expected to catalyze the competing HER. In this work, we have modified the Ni NPs by encapsulating them into porous Ni-N-C nanosheets (Ni@Ni-N-C), to boost the synergy between Ni NPs and dispersed Ni-N species towards CORR. The CO faradaic efficiency (FE) reached 96.4% at -0.9 V and retained over 90% in a wide potential window. More importantly, FE values of over 94% have been obtained from -50 to -170 mA cm with a peak FE of 99% in a flow cell. Our work demonstrates that the surface modification of Ni NPs can inhibit the unexpected HER and activate the surface sites, offering a practical design strategy for CORR catalysts.
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