文献类型：期刊文献

英文题名：Ni-Co Codoping Breaks the Limitation of Single-Metal-Doped IrO2 with Higher Oxygen Evolution Reaction Performance and Less Iridium

作者：Zaman, Waqas Qamar[1];Wang, Zhiqiang[2,3];Sun, Wei[1];Zhou, Zhenhua[1];Tariq, Muhammad[1];Cao, Limei[1];Gong, Xue-Qing[2,3];Yang, Ji[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Ctr Computat Chem, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Res Inst Ind Catalysis, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2017

卷号：2

期号：12

起止页码：2786

外文期刊名：ACS ENERGY LETTERS

收录：;EI(收录号：20183905864999);WOS:【SCI-EXPANDED(收录号:WOS:000417888400021)】；

基金：This work is financially supported by the National Natural Science Foundation of China (51778229). We thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.

语种：英文

外文关键词：Cobalt alloys - Binary alloys - Density functional theory - Doping (additives) - Cobalt - Nickel - Iridium - Oxygen - Iridium alloys - Lattice mismatch

摘要：Synthesizing solid solutions of IrO2 via doping is known to be a viable approach for effectively using iridium metal by enhancing its intrinsic properties. However, such composites at certain fractional values of dopants realize the substitution limit because of lattice mismatch. Here, on the basis of density functional theory studies and experimentation, we demonstrate codoping as an effective approach to overcome this result with an outstanding oxygen evolution reaction (OER) activity. Nickel and cobalt as the case dopants for the host structure IrO2 atomically substituted 5090 of the precious metal. As a new structural insight, the decreased crystal energy was determined to be the key factor for considerable insertion of dopants. Furthermore, the synthesized codoped IrO2 reflected an overpotential of only 285 mV at a current density of 10 mA.cm(-2), which is appreciably lower than the 320 and 330 mV for individually doping cobalt and nickel, respectively. Our presented approach suggests further OER optimization methods with extensive reduction of precious metals.