摘要
Crystal planes of a catalyst play crucial role in determining the electrocatalytic performance for CO_2 reduction.The catalyst SnO_2 can convert CO_2 molecules into valuable formic acid(HCOOH).Incorporating heteroatom N into SnO_2 further improves its catalytic activity.To understand the mechanism and realize a highly efficient CO_2-to-HCOOH conversion,we used density functional theory(DFT)to calculate the free energy of CO_2 reduction reactions(CO_2RR)on different crystal planes of N-doped SnO_2(N-SnO_2).The results indicate that N-SnO_2 lowered the activation energy of intermediates leading to a better catalytic performance than pure SnO_2.We also discovered that the N-Sn O_2 (211)plane possesses the most suitable free energy during the reduction process,exhibiting the best catalytic ability for the CO_2-to-HCOOH conversion.The intermediate of CO_2RR on N-SnO_2 is HCOO~*or COOH~* instead of OCHO~*.These results may provide useful insights into the mechanism of CO_2RR,and promote the development of heteroatomdoped catalyst for efficient CO_2RR.
Crystal planes of a catalyst play crucial role in determining the electrocatalytic performance for CO_2 reduction.The catalyst SnO_2 can convert CO_2 molecules into valuable formic acid(HCOOH).Incorporating heteroatom N into SnO_2 further improves its catalytic activity.To understand the mechanism and realize a highly efficient CO_2-to-HCOOH conversion,we used density functional theory(DFT)to calculate the free energy of CO_2 reduction reactions(CO_2RR)on different crystal planes of N-doped SnO_2(N-SnO_2).The results indicate that N-SnO_2 lowered the activation energy of intermediates leading to a better catalytic performance than pure SnO_2.We also discovered that the N-Sn O_2 (211)plane possesses the most suitable free energy during the reduction process,exhibiting the best catalytic ability for the CO_2-to-HCOOH conversion.The intermediate of CO_2RR on N-SnO_2 is HCOO~*or COOH~* instead of OCHO~*.These results may provide useful insights into the mechanism of CO_2RR,and promote the development of heteroatomdoped catalyst for efficient CO_2RR.
引文
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