Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 298, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120630
Keywords
Transition metal sulfides; Cobalt single atoms; Heteroatom doping; Carbon nanotubes; Hydrogen evolution reaction
Funding
- National Natural Science Foundation of China [21971129, 21961022, 21661023, 21802076, 21962013]
- 111 Project [D20033]
- Natural Science Foundation of Inner Mongolia Autonomous Region of China [2018BS05007]
- Program of Higher-level Talents of IMU [21300-5185111, 21300-5195109]
- Cooperation Project of State Key Laboratory of Baiyun Obo Rare Earth Resource [2017Z1950]
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The multicomponent 3D monolithic electrode showed excellent electrocatalytic performance for hydrogen evolution reaction due to the abundant active sites, outstanding conductivity, and favorable hydrogen adsorption free energy. It outperformed most previously reported molybdenum/cobalt sulfide-based electrocatalysts in acidic and alkaline solutions. Additionally, the electrode demonstrated good durability and stability under prolonged cycling and electrolysis.
A multicomponent 3D monolithic electrode was designed that consists of Co single atoms anchored/nitrogen, sulfur co-doped carbon nanotubes (CoSAs-NS-CNTs) on carbon cloth (CC) with ultra-thin MoS2 nanosheets externally decorated and ultra-small CoS2 nanodots internally confined (MoS2/CoSAs-NS-CNTs@CoS2/CC) to form a hybrid heterojunction electrode with double interfaces as vectorial electron transport pathways for promoting electrocatalytic performance. The integration of well-distributed MoS2 nanosheets and CoS2 nanodots linked with Co single atoms anchored/N, S co-doped CNTs endows abundant multiple active sites, outstanding conductivity, and the downshifted d-band center with a thermodynamically favorable hydrogen adsorption free energy (Delta G(H*)) for effectively catalyzing hydrogen evolution reaction (HER). As a result, the optimal MoS2/CoSAs-NS-CNTs@CoS2/CC electrode exhibits outstanding HER performance with overpotentials of 72 and 56 mV at 10 mA cm(-2) and small Tafel slopes of 59.4 and 43.2 mV dec(-1) in acidic and alkaline solutions, respectively, outperforming most of the previously reported molybdenum/cobalt sulfide-based electrocatalysts. Moreover, the electrode also displays good durability and stability reflected from the small decrease on activity after 5000 CV cycles and nearly no decay in current density after electrolysis for 20 h.
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