用均匀沉淀法制备了片状复合氧化镍 NiMO（M = Li，Sr，Y，Fe，La）催化剂，并研究了其对乙烷氧化脱氢制乙烯的催化性能.采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、程序升温还原（H2-TPR）和程序升温脱附（O2-TPD）等方法对镍基...用均匀沉淀法制备了片状复合氧化镍 NiMO（M = Li，Sr，Y，Fe，La）催化剂，并研究了其对乙烷氧化脱氢制乙烯的催化性能.采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、程序升温还原（H2-TPR）和程序升温脱附（O2-TPD）等方法对镍基催化剂进行了表征. X 射线衍射和扫描电子显微镜检测结果表明：助剂的加入对催化剂的形貌影响不大，仍为片状结构；平均粒径为5~10 nm.程序升温还原和脱附表征结果表明：助剂 Li，Sr并未进入 NiO 晶格；而助剂 Y，Fe，La 与 Ni 之间具有相互作用，因而影响催化剂的理化性质和催化活性.其中， Fe 掺杂的片状氧化镍催化剂对乙烯的选择性和收率均有所改善，340℃时 NiFeO 催化剂上的乙烯收率可达18.2%.展开更多
NiFe(oxy)hydroxides nanosheets were synthesized on nickel foams via co-precipitation and electrochemical activation. It is found that the phosphate precursors(Na_(3)PO_(4), Na_(2)HPO_(4)and NaH_(2)PO_(4)) have diverse...NiFe(oxy)hydroxides nanosheets were synthesized on nickel foams via co-precipitation and electrochemical activation. It is found that the phosphate precursors(Na_(3)PO_(4), Na_(2)HPO_(4)and NaH_(2)PO_(4)) have diverse effects on the morphology and thus the oxygen evolution reaction activity of the formed final catalysts. The resulting NiFe(oxy)hydroxides nanosheets prepared with Na_(2)HPO_(4)demonstrate a low overpotential of 205 m V to achieve a current density of 50 mA/cm^(2) with a Tafel slope down to 30 mV/dec in 1 mol/L KOH, and remain stable for 20 h during stability test.展开更多
文摘用均匀沉淀法制备了片状复合氧化镍 NiMO（M = Li，Sr，Y，Fe，La）催化剂，并研究了其对乙烷氧化脱氢制乙烯的催化性能.采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、程序升温还原（H2-TPR）和程序升温脱附（O2-TPD）等方法对镍基催化剂进行了表征. X 射线衍射和扫描电子显微镜检测结果表明：助剂的加入对催化剂的形貌影响不大，仍为片状结构；平均粒径为5~10 nm.程序升温还原和脱附表征结果表明：助剂 Li，Sr并未进入 NiO 晶格；而助剂 Y，Fe，La 与 Ni 之间具有相互作用，因而影响催化剂的理化性质和催化活性.其中， Fe 掺杂的片状氧化镍催化剂对乙烯的选择性和收率均有所改善，340℃时 NiFeO 催化剂上的乙烯收率可达18.2%.
基金supported by the National Natural Science Foundation of China (Nos. 11904411, 52072308)the Fundamental Research Funds for the Central Universities, China (Nos. 3102021MS0404, 3102019JC001)。
文摘NiFe(oxy)hydroxides nanosheets were synthesized on nickel foams via co-precipitation and electrochemical activation. It is found that the phosphate precursors(Na_(3)PO_(4), Na_(2)HPO_(4)and NaH_(2)PO_(4)) have diverse effects on the morphology and thus the oxygen evolution reaction activity of the formed final catalysts. The resulting NiFe(oxy)hydroxides nanosheets prepared with Na_(2)HPO_(4)demonstrate a low overpotential of 205 m V to achieve a current density of 50 mA/cm^(2) with a Tafel slope down to 30 mV/dec in 1 mol/L KOH, and remain stable for 20 h during stability test.
