Sulfide@hydroxide core-shell nanostructure via a facile heating-electrodeposition method for enhanced electrochemical and photoelectrochemical water oxidation

• 作者: Yao Lu Huijuan Yu Cong Chen Ronglei Fan Mingrong Shen
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（7）
• 页码范围: 431-440
• 页数: 10页
• 语种: 英文

摘要

Designing low-cost,easy-fabricated,highly stable and active electrocatalysts for oxygen evolution reaction (OER) is crucial for electrochemical (EC) and solar-driven photoelectrochemical (PEC) water splitting.By using a facile heating-electrodeposition method,here we fabricated a porous but crystalline Fe-doped Ni3S2.A thin porous surface NiFe hydroxide layer (～10 nm) is then formed through OER-running.By virtue of the core Fe-doped Ni3S2 with good conductivity and the shell NiFe hydroxide surface with good electrocatalytic activity,the core-shell nanostructure on Ni foam exhibits excellent OER activity in 1 M NaOH,needing only 195 and 230 mV to deliver 10 and 100 mA/cm2,respectively,much more superior to those of 216 and 259 mV for the sample deposited under normal temperature.The enhanced photo-response of the sulfide@hydroxide core-shell structure was also demonstrated,due to the efficient transfer of photo-generated carriers on the core/shell interface.More interestingly,it shows a good compatibility with Si based photoanode,which exhibits an excellent PEC performance with an onset potential of 0.86 V vs.reversible hydrogen electrode,an applied bias photon-to-current efficiency of 5.5％ and a durability for over 120 h under AM 1.5 G 1 sun illumination,outperforming the state-of-the-art Si based photoanodes.