posted on 2019-05-31, 00:00authored byTengfei Li, Hongmei Wei, Tianmo Liu, Gengfeng Zheng, Subiao Liu, Jing-Li Luo
Tunable In(OH)3-coupled Cu2O-derived hybrid catalysts are facilely
synthesized to boost the selectivity and efficiency of the electrochemical
CO2 reduction reaction (CO2RR). The maximum
faradaic efficiency (FE) of 90.37% for CO production is achieved at
−0.8 V versus reversible hydrogen electrode. The mechanistic
discussion suggests that the composition-dependent synergistic effect
results in the enhanced selectivity for CO on the hybrid catalyst.
By increasing the concentration of the electrolyte, a dramatically
enhanced current density of 40.17 mA cm–2 was achieved
at −1.0 V in 0.7 M KHCO3. Furthermore, a KHCO3 electrolyte with high concentration promotes the selectivity
of CO2RR over the low overpotential range. At a low overpotential
of 290 mV, the increased FE for CO of 74.05% is obtained in 0.7 M
KHCO3 as compared to that of 57.04% in 0.1 M KHCO3. Combining with the synergistic effect of the catalyst and the concentration
effect of the electrolyte, the hybrid catalyst achieves high efficiency,
high selectivity, and high stability for CO2RR.