Facile synthesis of free-standing nickel chalcogenide electrodes for overall water splitting

• 来源期刊: 能源化学
• 年，卷（期）: 2017,（6）
• 页码范围: 1217-1222
• 页数: 6页
• 语种: 英文

摘要

Developing high-performance noble metal-free and free-standing catalytic electrodes are crucial for overall water splitting.Here,nickel sulfide (Ni3S2) and nickel selenide (NiSe) are synthesized on nickel foam (NF) with a one-pot solvothermal method and directly used as free-standing electrodes for efficiently catalyzing hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution.In virtue of abundant active sites,the Ni3S2/NF and the NiSe/NF electrodes can deliver a current density of 10mA cm-2 at only 123mY,137mY for HER and 222mV,271mV for OER.Both of the hierarchical Ni3S2/NF and NiSe/NF electrodes can serve as anodes and cathodes in electrocatalytic overall watersplitting and can achieve a current density of 10mA cm-2 with an applied voltage of ～1.59V and 1.69V,respectively.The performance of as-obtained Ni3S2/NF||Ni3S2/NF is even close to that of the noble metalbased Pt/C/NF||IrO2/NF system.