@article{Wang2016, author = {Yan Wang and Wei Huang and Conghui Si and Jie Zhang and Xuejiao Yan and Chuanhong Jin and Yi Ding and Zhonghua Zhang}, title = {Self-supporting nanoporous gold-palladium overlayer bifunctional catalysts toward oxygen reduction and evolution reactions}, year = {2016}, journal = {Nano Research}, volume = {9}, number = {12}, pages = {3781-3794}, keywords = {density functional theory, oxygen reduction reaction, oxygen evolution reaction, nanoporous gold, Pd overlayer}, url = {https://www.sciopen.com/article/10.1007/s12274-016-1248-x}, doi = {10.1007/s12274-016-1248-x}, abstract = {The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are crucial processes for energy conversion/storage systems, such as fuel cells, metal–air batteries, and water splitting. However, both reactions are severely restricted by their sluggish kinetics, thus requiring highly active, cost-effective, and durable electrocatalysts. Herein, we develop novel bifunctional nanocatalysts through surface nanoengineering of dealloying-driven nanoporous gold (NPG). Pd overlayers were precisely deposited onto the NPG ligament surface by epitaxial layer-by-layer growth. More importantly, the obtained NPG-Pd overlayer nanocatalysts exhibit remarkably enhanced electrocatalytic activities toward both the ORR and OER in alkaline media, benchmarked against a stateof- the-art Pt/C catalyst. The improved electrocatalytic performance is rationalized by the unique three-dimensional nanoarchitecture of NPG, enhanced Pd utilization efficiency from precise control of the Pd overlayers, and change in electronic structure, as revealed by density functional theory calculations.} }