Inducing the classic strong metal-support interaction(SMSI)is an effective approach to enhance the performance of supported metal catalysts by encapsulating the metal nanoparticles(NPs)with supports.Conventional therm...Inducing the classic strong metal-support interaction(SMSI)is an effective approach to enhance the performance of supported metal catalysts by encapsulating the metal nanoparticles(NPs)with supports.Conventional thermal reduction method for inducing SMSI processes is often accompanied by undesirable structural evolution of metal NPs.In this study,a mild electrochemical method has been developed as a new approach to induce SMSI,using the cable structured core@shell CNT@SnO_(2) loaded Pt NPs as a proof of concept.The induced SnO_(x) encapsulation layer on the surface of Pt NPs can protect Pt NPs from the poisoned of CO impurity in hydrogen oxidation reaction(HOR),and the HOR current density could still maintain 85% for 2000 s with 10,000 ppm CO in H_(2),while the commercial Pt/C is completely inactivated.In addition,the electrons transfer from SnO_(x) to Pt NPs improved the HOR activity of the E-Pt-CNT@SnO_(2),achieving the excellent exchange current density of 1.55 A·mgPt^(-1).In situ Raman spectra and theoretical calculations show that the key to the electrochemical-method-induced SMSI is the formation of defects and the migration of SnO_(x) caused by the electrochemical redox operation,and the weakening the SneO bond strength by Pt NPs.展开更多
A new alkaloid, methyl 6-（isoprenyl）-lH-indole-3-carboxylate （1）, was isolated from the solid culture broth of fungus Chaetomium globosum, together with five known compounds, including N-acetyl-L-tryptophan （2）,...A new alkaloid, methyl 6-（isoprenyl）-lH-indole-3-carboxylate （1）, was isolated from the solid culture broth of fungus Chaetomium globosum, together with five known compounds, including N-acetyl-L-tryptophan （2）, xylariol B （3）, 5-（methoxymethyl）- 1H-pyrrole-2-carbaldehyde （4）, ergosterol （5） and ergosta-4,6,8（14）,22-tetraen-3-one （6）. Their chemical structures were elucidated by spectroscopic data （UV, IR, HRESIMS, and NMR）. In addition, it is the first report of compounds 2 and 3 from the fungus Chaetomium globosum.展开更多
基金the“National Natural Science Foundation of China(No.22122202)”.
文摘Inducing the classic strong metal-support interaction(SMSI)is an effective approach to enhance the performance of supported metal catalysts by encapsulating the metal nanoparticles(NPs)with supports.Conventional thermal reduction method for inducing SMSI processes is often accompanied by undesirable structural evolution of metal NPs.In this study,a mild electrochemical method has been developed as a new approach to induce SMSI,using the cable structured core@shell CNT@SnO_(2) loaded Pt NPs as a proof of concept.The induced SnO_(x) encapsulation layer on the surface of Pt NPs can protect Pt NPs from the poisoned of CO impurity in hydrogen oxidation reaction(HOR),and the HOR current density could still maintain 85% for 2000 s with 10,000 ppm CO in H_(2),while the commercial Pt/C is completely inactivated.In addition,the electrons transfer from SnO_(x) to Pt NPs improved the HOR activity of the E-Pt-CNT@SnO_(2),achieving the excellent exchange current density of 1.55 A·mgPt^(-1).In situ Raman spectra and theoretical calculations show that the key to the electrochemical-method-induced SMSI is the formation of defects and the migration of SnO_(x) caused by the electrochemical redox operation,and the weakening the SneO bond strength by Pt NPs.
基金National Natural Science Foundation of China(Grant No.31570361)
文摘A new alkaloid, methyl 6-（isoprenyl）-lH-indole-3-carboxylate （1）, was isolated from the solid culture broth of fungus Chaetomium globosum, together with five known compounds, including N-acetyl-L-tryptophan （2）, xylariol B （3）, 5-（methoxymethyl）- 1H-pyrrole-2-carbaldehyde （4）, ergosterol （5） and ergosta-4,6,8（14）,22-tetraen-3-one （6）. Their chemical structures were elucidated by spectroscopic data （UV, IR, HRESIMS, and NMR）. In addition, it is the first report of compounds 2 and 3 from the fungus Chaetomium globosum.
