Fabrication of C/Co-FeS2/CoS2 with Highly Efficient Hydrogen Evolution Reaction

The mainstream strategy for designing hydrogen electrocatalysts is to adjust their surface electronic structure; however, the conductivity of the electrocatalyst and the synergy with its substrate are still challenges to overcome. In this work, we report a carbon-doped Co-FeS2/CoS2 (C/Co-FeS2/CoS2) electrode, prepared via a hydrothermal process with carbon cloth (CC) as the substrate and carbon doping. The C/Co-FeS2/CoS2 electrode shows excellent catalytic activity in the hydrogen evolution reaction (HER) with an overpotential of 88 mV at a current density of −10 mA∙cm−2 in 0.5 M H2SO4 solution. The Tafel slope is 66 mV∙dec−1. Such superior performance is attributed to the high electrical conductivity of the electrocatalyst and its synergy with the substrate. Our study provides an efficient alternative in the field of electrocatalysis.

Download Full-text

Recasting Ni-foam into NiF2 nanorod arrays via a hydrothermal process for hydrogen evolution reaction application

Dalton Transactions ◽

10.1039/d1dt00654a ◽

2021 ◽

Author(s):

Nanasaheb M. Shinde ◽

Siddheshwar D. Raut ◽

Balaji G. Ghule ◽

Krishna Chaitanya Gunturu ◽

James J. Pak ◽

...

Keyword(s):

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Nickel Foam ◽

Hydrothermal Process ◽

Reduction Process ◽

Nanorod Arrays ◽

Ni Foam

A promising electrode for hydrogen evolution reaction (HER) has been prepared via a reduction process to form NiF2 nanorod arrays directly grown on a 3D nickel foam.

Download Full-text

Defect-Rich Heterogeneous MoS2/rGO/NiS Nanocomposite for Efficient pH-Universal Hydrogen Evolution

Nanomaterials ◽

10.3390/nano11030662 ◽

2021 ◽

Vol 11 (3) ◽

pp. 662 ◽

Cited By ~ 1

Author(s):

Guangsheng Liu ◽

Kunyapat Thummavichai ◽

Xuefeng Lv ◽

Wenting Chen ◽

Tingjun Lin ◽

...

Keyword(s):

Graphene Oxide ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Active Sites ◽

Reduced Graphene ◽

Heterogeneous Interfaces ◽

Wide Ph Range ◽

Ph Range ◽

A Current ◽

Poor Stability

Molybdenum disulfide (MoS2) has been universally demonstrated to be an effective electrocatalytic catalyst for hydrogen evolution reaction (HER). However, the low conductivity, few active sites and poor stability of MoS2-based electrocatalysts hinder its hydrogen evolution performance in a wide pH range. The introduction of other metal phases and carbon materials can create rich interfaces and defects to enhance the activity and stability of the catalyst. Herein, a new defect-rich heterogeneous ternary nanocomposite consisted of MoS2, NiS and reduced graphene oxide (rGO) are synthesized using ultrathin αNi(OH)2 nanowires as the nickel source. The MoS2/rGO/NiS-5 of optimal formulation in 0.5 M H2SO4, 1.0 M KOH and 1.0 M PBS only requires 152, 169 and 209 mV of overpotential to achieve a current density of 10 mA cm−2 (denoted as η10), respectively. The excellent HER performance of the MoS2/rGO/NiS-5 electrocatalyst can be ascribed to the synergistic effect of abundant heterogeneous interfaces in MoS2/rGO/NiS, expanded interlayer spacings, and the addition of high conductivity graphene oxide. The method reported here can provide a new idea for catalyst with Ni-Mo heterojunction, pH-universal and inexpensive hydrogen evolution reaction electrocatalyst.

Download Full-text