Homogeneously dispersed multimetal oxygen-evolving catalysts

Autor(es):Mostrar menos -

Zhang, Bo ^{[1, 2]} ; Zheng, Xueli ^{[1, 3]} ; Voznyy, Oleksandr ^[1] ; Comin, Riccardo ^[1] ; Bajdich, Michal ^{[4, 5]} ; Garcia-Melchor, Max ^{[4, 5]} ; Han, Lili ^[6] ; Xu, Jixian ^[1] ; Liu, Min ^[1] ; Zheng, Lirong ^[7] ; de Arquer, F. Pelayo Garcia ^[1] ; Dinh, Cao Thang ^[1] ; Fan, Fengjia ^[1] ; Yuan, Mingjian ^[1] ; Yassitepe, Emre ^[1] ; Chen, Ning ^[8] ; Regier, Tom ^[8] ; Liu, Pengfei ^[9] ; Li, Yuhang ^[9] ; De Luna, Phil ^[1] ; Janmohamed, Alyf ^[1] ; Xin, Huolin L. ^[6] ; Yang, Huagui ^[9] ; Vojvodic, Aleksandra ^{[4, 5]} ; Sargent, Edward H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Toronto, Dept Elect & Comp Engn, 35 St George St, Toronto, ON M5S 1A4 - Canada

^[2] E China Univ Sci & Technol, Dept Phys, 130 Meilong Rd, Shanghai 200237 - Peoples R China

^[3] Tianjin Univ, Sch Mat Sci & Engn, Tianjin Key Lab Composite & Funct Mat, Tianjin 300072 - Peoples R China

^[4] Stanford Univ, Dept Chem Engn, SUNCAT Ctr Interface Sci & Catalysis, Stanford, CA 94305 - USA

^[5] SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 - USA

^[6] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 - USA

^[7] Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Inst High Energy Phys, Beijing 100049 - Peoples R China

^[8] Canadian Light Source CLS, 44 Innovation Blvd, Saskatoon, SK S7N 2V3 - Canada

^[9] E China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, 130 Meilong Rd, Shanghai 200237 - Peoples R China

• Tipo de documento: Artigo Científico
• Fonte: Science; v. 352, n. 6283, p. 333-337, APR 15 2016.
• Citações Web of Science: 551

Resumo

Earth-abundant first-row (3d) transition metal-based catalysts have been developed for the oxygen-evolution reaction (OER); however, they operate at overpotentials substantially above thermodynamic requirements. Density functional theory suggested that non-3d high-valency metals such as tungsten can modulate 3d metal oxides, providing nearoptimal adsorption energies for OER intermediates. We developed a room-temperature synthesis to produce gelled oxyhydroxides materials with an atomically homogeneous metal distribution. These gelled FeCoW oxyhydroxides exhibit the lowest overpotential (191 millivolts) reported at 10 milliamperes per square centimeter in alkaline electrolyte. The catalyst shows no evidence of degradation after more than 500 hours of operation. X-ray absorption and computational studies reveal a synergistic interplay between tungsten, iron, and cobalt in producing a favorable local coordination environment and electronic structure that enhance the energetics for OER. (AU)

• Processo FAPESP: 14/18327-9 - Quantum dots coloidais com defeitos superficiais passivados para aplicações em células solares de filmes finos de heterojunção P-N
• Beneficiário: Emre Yassitepe
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado