题目： | Approaching the Volcano Top: Iridium/silicon Nanocomposites as Efficient Electrocatalysts for the Hydrogen Evolution Reaction |
作者： | Minqi Sheng 1§, Binbin Jiang 1§ , Bin Wu 1 , Fan Liao 1 , Xing Fan1 , Haiping Lin 1*,Youyong Li 1 , Yeshayahu Lifshitz 2 , Shuit-Tong Lee1, Mingwang Shao 1* |
单位： | 1Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nanoscience and Technology, Soochow University, 199 Ren-AiRoad, Suzhou 215123, China. 2Materials Science and Engineering Department, Technion, Israel Institute of Technology, Haifa 3200003, Israel |
摘要： | Electrolysis of water to generate hydrogen is an important issue for the industrial production of green and sustainable energy. The best electrocatalyst currently available for the hydrogen evolution reaction (HER) is platinum. We herein show that iridium can be manipulated to achieve a record high HER activity surpassing platinum in every aspect: a lower overpotential at any given current density, a higher current density, and mass activity for all bias potentials applied and a catalyst cost reduction of 50% for the same hydrogen generation rate. The superior HER activity was achieved by a binary Ir/Si nanowire catalyst design in which (as density functional theory calculations show) two distinct strategies act in synergy: (i) decreasing the size of the iridium nanoparticles to 2.2 nm and (ii) dividing the H2-generation process to three steps occurring on two different catalysts: H adsorption on iridium, H diffusion to silicon, and H2 desorption from silicon. |
影响因子： | 13.709 |
分区情况： | 一区 |
链接： | https://pubs.acs.org/doi/10.1021/acsnano.8b07572 责任编辑：朱文昌 |