Self-Supported Hierarchical IrO2@NiO Nanoflake Arrays as an Efficient and Durable Catalyst for Electrochemical Oxygen Evolution

Liu, Jinlong1,3; Wang, Zhenyu4; Su, Kanda1; Xv, Deyao1; Zhao, Dan1; Li, Junhua5; Tong, Haixia6; Qian, Dong1; Yang, Chunming2; Lu, Zhouguang4

2019-07-24

10.1021/acsami.9b05785

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

1944-8252

Although traditional Ir02 nanoparticles loaded on a carbon support (IrO2pC) have been taken as a benchmark catalyst for the oxygen evolution reaction (OER), their catalytic efficiency, operation stability, and Ir02 utilization are far from satisfactory due to the inferior powdery structure and inevitable corrosion of both Ir02 and C under the oxidizing potentials. Here, a rational design of a self-supported hierarchical nanocomposite, composed of Ir02@Ni0 nanoparticle-built porous nanoflake arrays vertically growing on nickel foam, is proposed, which is demonstrated as a versatile strategy to achieve improved OER activity, remarkable long-term stability, and significantly reduced loading of Ir02 (0.62 atom %). Impressively, the resultant catalyst drives a steady OER current density of 10 mA cm-2, requiring 278 mV overpotential in 1.0 M KOH electrolyte for 25 h and outmaneuvring commercial IrO2pC with much higher mass loading. Further electrochemical investigation and mechanism analysis disclose that the greatly improved electrocatalytic activity stems from the advantageous hierarchical structure and the synergistic effect between Ir02 and underlying potential-induced NiOOH, whereas the outstanding durability is attributed to the unique role of NiO in preventing Ir02 dissolution.

iridium dioxide nickel oxide nanoflake array electrocatalyst oxygen evolution

SCI ; EI

英语

通讯

Changsha Municipal Science and Technology project fund[kq1706062]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000477787200023

AMER CHEMICAL SOC

20193307322801

Corrosion ; Electrocatalysts ; Electrolytes ; Foams ; Nanoparticles ; Nickel oxide ; Oxygen ; Potassium hydroxide

Nanotechnology:761 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Solid State Physics:933

Web of Science

1.Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China
2.Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China
3.Univ Cambridge, Dept Engn, Cambridge CB3 OFA, England
4.South Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518005, Peoples R China
5.Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China
6.Changsha Univ Sci & Technol, Inst Chem & Biol Engn, Changsha 410114, Hunan, Peoples R China

Liu, Jinlong,Wang, Zhenyu,Su, Kanda,et al. Self-Supported Hierarchical IrO2@NiO Nanoflake Arrays as an Efficient and Durable Catalyst for Electrochemical Oxygen Evolution[J]. ACS Applied Materials & Interfaces,2019,11(29):25854-25862.

Liu, Jinlong.,Wang, Zhenyu.,Su, Kanda.,Xv, Deyao.,Zhao, Dan.,...&Lu, Zhouguang.(2019).Self-Supported Hierarchical IrO2@NiO Nanoflake Arrays as an Efficient and Durable Catalyst for Electrochemical Oxygen Evolution.ACS Applied Materials & Interfaces,11(29),25854-25862.

Liu, Jinlong,et al."Self-Supported Hierarchical IrO2@NiO Nanoflake Arrays as an Efficient and Durable Catalyst for Electrochemical Oxygen Evolution".ACS Applied Materials & Interfaces 11.29(2019):25854-25862.