TY - JOUR
T1 - Hierarchical Cu nanoparticle-aggregated cages with high catalytic activity for reduction of 4-nitrophenol and carbon dioxide
AU - Jiang, Jianwei
AU - Gunasekar, Gunniya Hariyanandam
AU - Park, Sanghyuk
AU - Kim, Sang Ho
AU - Yoon, Sungho
AU - Piao, Longhai
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/4
Y1 - 2018/4
N2 - Hierarchical ∼10 nm Cu nanoparticle (NP)-aggregated sub-micro cage catalysts (diameter: ∼800 nm) with a hollow interior and porous shell were prepared from SiO2 encapsulated Cu2O nanoparticle aggregates (NPAs) using a facile and scalable method. The Cu cages were analyzed by field emission-scanning electron microscopy (FE-SEM), energy-dispersed X-ray (EDX), transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction (SAED), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). Owing to the small primary Cu NPs and characteristic porous shell and hollow interior, the Cu cages showed an extraordinarily high catalytic activity in the reduction of 4-nitrophenol by NaBH4 in aqueous solution. The activity factor (K = 520 s−1 g−1) is approximately 2.8 times greater than the previous highest K value of unsupported Cu catalysts. In addition, the excellent catalytic activity of the Cu cages in hydrogenation of CO2 to formate, with a TON value of 58 at 200 °C, was comparable to that of various noble metal-supported heterogeneous catalysts and surpassed the vast majority of homogeneous first-row transition metal catalysts.
AB - Hierarchical ∼10 nm Cu nanoparticle (NP)-aggregated sub-micro cage catalysts (diameter: ∼800 nm) with a hollow interior and porous shell were prepared from SiO2 encapsulated Cu2O nanoparticle aggregates (NPAs) using a facile and scalable method. The Cu cages were analyzed by field emission-scanning electron microscopy (FE-SEM), energy-dispersed X-ray (EDX), transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction (SAED), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). Owing to the small primary Cu NPs and characteristic porous shell and hollow interior, the Cu cages showed an extraordinarily high catalytic activity in the reduction of 4-nitrophenol by NaBH4 in aqueous solution. The activity factor (K = 520 s−1 g−1) is approximately 2.8 times greater than the previous highest K value of unsupported Cu catalysts. In addition, the excellent catalytic activity of the Cu cages in hydrogenation of CO2 to formate, with a TON value of 58 at 200 °C, was comparable to that of various noble metal-supported heterogeneous catalysts and surpassed the vast majority of homogeneous first-row transition metal catalysts.
KW - 4-Nitrophenol reduction
KW - CO hydrogenation
KW - Heterogeneous catalyst
KW - Hierarchical Cu nanoparticle-aggregated cages
KW - Porous Cu catalyst
UR - http://www.scopus.com/inward/record.url?scp=85038828579&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2017.12.018
DO - 10.1016/j.materresbull.2017.12.018
M3 - Article
AN - SCOPUS:85038828579
SN - 0025-5408
VL - 100
SP - 184
EP - 190
JO - Materials Research Bulletin
JF - Materials Research Bulletin
ER -