Mesoporous Thin-Film NiS2 as an Idealized Pre-Electrocatalyst for a Hydrogen Evolution Reaction

被引:67
作者
Karakaya, Cuneyt [1 ,2 ,3 ]
Solati, Navid [1 ,2 ]
Savaci, Umut [4 ]
Kele, Emre [4 ]
Turan, Servet [4 ]
Celebi, Serdar [3 ]
Kaya, Sarp [1 ,2 ,5 ]
机构
[1] Koc Univ, Mat Sci & Engn, TR-34450 Istanbul, Turkey
[2] Koc Univ, Tupras Energy Ctr KUTEM, TR-34450 Istanbul, Turkey
[3] Turkish Petr Refineries Co Tupras R&D, TR-41790 Kocaeli, Turkey
[4] Eskisehir Tech Univ ESTU, Dept Mat Sci & Engn, TR-26555 Eskisehir, Turkey
[5] Koc Univ, Dept Chem, TR-34450 Istanbul, Turkey
关键词
NiS2; HER; mesoporous thin films; water splitting; stability; BIFUNCTIONAL ELECTROCATALYST; ULTRATHIN NANOSHEETS; CARBON NANOTUBES; EFFICIENT; SULFIDE; PHOSPHIDE; CATALYST; NITRIDES; NI3S2; SITES;
D O I
10.1021/acscatal.0c03094
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Developing active, durable, and inexpensive electrocatalysts is critical for hydrogen production to meet ever-growing sustainable energy needs. Nickel sulfides offer significant potential as electrocatalysts for a hydrogen evolution reaction (HER); however, the active phase governing the electrochemical conversion is still under debate. We show that mesoporous thin-film NiS2 synthesized by a novel soft-templating method without post-sulfurization exhibits superior HER activity in alkaline media after a preconditioning step that results in sulfur leaching, amorphization of the surface, and collapse of the mesoporous structure. A comparative analysis with crystalline NiS2 reveals that partial hydroxylation of the under-coordinated Ni sites is responsible for the superior HER activity.
引用
收藏
页码:15114 / 15122
页数:9
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