Non-noble transition metal oxides(TMOs)are promising catalysts with improved catalytic activity and stability in oxygen evolution reaction(OER).However,the structural complexity of TMO-based electrocatalysts renders t...Non-noble transition metal oxides(TMOs)are promising catalysts with improved catalytic activity and stability in oxygen evolution reaction(OER).However,the structural complexity of TMO-based electrocatalysts renders the determination of the active sites and OER mechanisms challenging.Here,we demonstrate that the OER activity of Co-doped one-dimensional W_(18)O_(49)(Co-W_(18)O_(49))is intrinsically dominated by the surface structure and electronic properties of the octahedral sites and Co-O-W bonds.Compared with RuO_(2) and W_(18)O_(49) heterogeneous electrocatalysts,Co-W_(18)O_(49) exhibits higher turnover frequency,attaining 1.97 s−1 at 500 mV overpotential.The results indicate that Co substitution contributes to the localized charge distribution of the active octahedral sites constructed by the Co-O-W bonds under OER conditions.Here,we determine the mechanism of TMOs for the OER,which may be applied to various other TMOs for OER electrocatalyst design.展开更多
基金support from the Natural Science Foundation of China as a general project(Grant Nos.21874099,22006029,22076082,and 22176140)Frontiers Science Center for New Organic Matter(Grant No.63181206)the Tianjin Commission of Science and Technology as a Key Technology Research and Develop-ment project(Grant Nos.19YFZCSF00740 and 20YFZCSN01070).
文摘Non-noble transition metal oxides(TMOs)are promising catalysts with improved catalytic activity and stability in oxygen evolution reaction(OER).However,the structural complexity of TMO-based electrocatalysts renders the determination of the active sites and OER mechanisms challenging.Here,we demonstrate that the OER activity of Co-doped one-dimensional W_(18)O_(49)(Co-W_(18)O_(49))is intrinsically dominated by the surface structure and electronic properties of the octahedral sites and Co-O-W bonds.Compared with RuO_(2) and W_(18)O_(49) heterogeneous electrocatalysts,Co-W_(18)O_(49) exhibits higher turnover frequency,attaining 1.97 s−1 at 500 mV overpotential.The results indicate that Co substitution contributes to the localized charge distribution of the active octahedral sites constructed by the Co-O-W bonds under OER conditions.Here,we determine the mechanism of TMOs for the OER,which may be applied to various other TMOs for OER electrocatalyst design.
