Boosting Electrocatalytic HER Activity of 3D Interconnected CoSP via Metal Doping: Active and Stable Electrocatalysts for pH-Universal Hydrogen Generation

被引：48

作者：

Bui, Viet Q. ^{[1
,2
]}

Kumar, Ashwani ^{[1
,2
]}

Bui, Huong T. D. ^{[1
,2
]}

Lee, Jinsun ^{[1
,2
]}

Hwang, Yosep ^{[1
,2
]}

Le, Hung M. ^{[3
]}

Kawazoe, Yoshiyuki ^{[4
]}

Lee, Hyoyoung ^{[1
,2
,5
]}

机构：

[1] Sungkyunkwan Univ, Inst Basic Sci IBS, Ctr Integrated Nanostruct Phys CINAP, Suwon 16419, South Korea

[2] Sungkyunkwan Univ SKKU, Dept Chem, Suwon 16419, South Korea

[3] Washington State Univ, Dept Chem, Pullman, WA 99164 USA

[4] Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808579, Japan

[5] Sungkyunkwan Univ SKKU, Dept Biophys, Suwon 16419, South Korea

来源：

CHEMISTRY OF MATERIALS | 2020年 / 32卷 / 22期

关键词：

Cobalt compounds - Electrocatalysts - Pyrites - Alkalinity - Hydrogen production - Negative ions - Positive ions - Binding energy;

D O I：

10.1021/acs.chemmater.0c03052

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：

Recently, many research studies have been focused on anion or cation substitution into the lattice of pyrite-type cobalt disulfide (CoS2) for enhancing the hydrogen evolution reaction (HER) performance. Nonetheless, finding the correct pair of anion-cation dual substitution with added synergistic effect for boosting pH-universal HER activity remains an ongoing challenge. Additionally, a generalized activity descriptor and the HER mechanism in alkaline media remain elusive. Herein, to elucidate the HER mechanism and obtain the suitable anion-cation pair, we investigated the codoping of metal cations (Ti/V/Cr/Mn/Fe) and phosphorus anions into the CoS2 moiety. Our theoretical prediction revealed that Ti and P codoping into CoS2 exhibits superior HER performance at both pH 0 and 14, which is ascribed to the weak hydrogen binding energy in acid and fast water dissociation kinetics in alkaline media, thereby promoting HER. Remarkably, a follow-up experiment confirmed that Ti-CoSP showed astonishing HER activity inducing low overpotentials of 44 and 132 mV at -10 mA cm(-2) in acidic and alkaline media, respectively, with superior stability for 40 h.

引用

页码：9591 / 9601

页数：11

共 51 条

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