BiOCl has been used in the photoreduction of CO_(2),but exhibits limited photocatalytic activity.In this study,Bi was in situ reduced and deposited on the surface of(001)-dominated BiOCl nanosheets by NaBH 4 to form B...BiOCl has been used in the photoreduction of CO_(2),but exhibits limited photocatalytic activity.In this study,Bi was in situ reduced and deposited on the surface of(001)-dominated BiOCl nanosheets by NaBH 4 to form Bi/BiOCl nanosheets enriched with oxygen vacancies.The as-prepared Bi/BiOCl nanosheets having low thickness(ca.10 nm)showed much higher concentration of oxygen vacancies compared to Bi/BiOCl nanoplates having high thickness(ca.100 nm).Subsequently,the photocatalytic activity of the Bi/BiOCl nanosheets enriched with oxygen vacancies for CO_(2)reduction was dramatically enhanced and much higher than that of BiOCl nanoplates,nanosheets,and Bi/BiOCl nanoplates.It showed that the improved photocatalytic activity in the reduction of CO_(2)can be attributed to the enhanced separation effi ciency of photogenerated electron–hole pairs of the oxygen vacancies on BiOCl nanosheets and Bi metals.This work demonstrated that the in situ reduction of non-noble metals on the surface of BiOCl nanosheets that are enriched with oxygen vacancies is favorable for increasing photocatalytic CO_(2)reduction.展开更多
The conversion of methane to syngas(H_(2) and CO)is an important route to produce high value-added products.Oxidize methane into syngas in the absence of gaseous oxidants is an economical route.In this work,NiO-MgO co...The conversion of methane to syngas(H_(2) and CO)is an important route to produce high value-added products.Oxidize methane into syngas in the absence of gaseous oxidants is an economical route.In this work,NiO-MgO composite is successfully synthesized via an impregnation method.At 764 K,methane is directly converted to syngas on the NiO-MgO without gaseous oxidants.A synergistic effect of NiO and MgO was observed,in which NiO induced lattice oxygen of MgO mobility to oxidize methane and suppressed the formation of intermediates for side reaction.As a result,NiO-MgO exhibited enhancement of catalytic activity with the H2 production rate of 1241.0µmol g^(-1) min^(-1),which was 3.4 times higher than that of pure MgO.This work provides a direct guidance to understand of methane oxidation via lattice oxygen under low temperature(<773 K).展开更多
基金This research was financially supported by the Sichuan Provincial International Cooperation Project(No.2019YFH0164)Chengdu International Cooperation Project(No.2019-GH02-00056-HZ)the National Natural Science Foundation of China(No.U1862111).Ying Zhou thanks the Cheung Kong Scholars Program of China and JSPS Invitational Fellowships for Research in Japan.
文摘BiOCl has been used in the photoreduction of CO_(2),but exhibits limited photocatalytic activity.In this study,Bi was in situ reduced and deposited on the surface of(001)-dominated BiOCl nanosheets by NaBH 4 to form Bi/BiOCl nanosheets enriched with oxygen vacancies.The as-prepared Bi/BiOCl nanosheets having low thickness(ca.10 nm)showed much higher concentration of oxygen vacancies compared to Bi/BiOCl nanoplates having high thickness(ca.100 nm).Subsequently,the photocatalytic activity of the Bi/BiOCl nanosheets enriched with oxygen vacancies for CO_(2)reduction was dramatically enhanced and much higher than that of BiOCl nanoplates,nanosheets,and Bi/BiOCl nanoplates.It showed that the improved photocatalytic activity in the reduction of CO_(2)can be attributed to the enhanced separation effi ciency of photogenerated electron–hole pairs of the oxygen vacancies on BiOCl nanosheets and Bi metals.This work demonstrated that the in situ reduction of non-noble metals on the surface of BiOCl nanosheets that are enriched with oxygen vacancies is favorable for increasing photocatalytic CO_(2)reduction.
基金financially supported by the Sichuan Provincial International Cooperation Project,China(Nos.2019YFH0164 and 2021YFH0055).
文摘The conversion of methane to syngas(H_(2) and CO)is an important route to produce high value-added products.Oxidize methane into syngas in the absence of gaseous oxidants is an economical route.In this work,NiO-MgO composite is successfully synthesized via an impregnation method.At 764 K,methane is directly converted to syngas on the NiO-MgO without gaseous oxidants.A synergistic effect of NiO and MgO was observed,in which NiO induced lattice oxygen of MgO mobility to oxidize methane and suppressed the formation of intermediates for side reaction.As a result,NiO-MgO exhibited enhancement of catalytic activity with the H2 production rate of 1241.0µmol g^(-1) min^(-1),which was 3.4 times higher than that of pure MgO.This work provides a direct guidance to understand of methane oxidation via lattice oxygen under low temperature(<773 K).
