Hydrogen energy is an important part of the future energy system. Hydrogen production by water electrolysis is one of the key technologies to reduce dependence on fossil fuels and reduce carbon emissions. As a promising non-precious metal catalyst, MoS2 has a unique electronic structure and chemical properties and has been widely used in the field of catalytic hydrogen production.
1T-MoS₂ loaded with high-density Pd single-atom catalyst to achieve efficient hydrogen evolution at all pH levels.
1T-MoS2 has attracted attention due to its high conductivity and catalytic activity, but it is still challenging to obtain high-purity 1T-MoS2. The 2024 journal Small reported that researchers developed a method for preparing 1T phase MoS2 by in-situ anchoring of SO42-. This work systematically studied the atomic-level dispersed structure of high-loaded precious metal Pd on 1T-MoS2 and explored its electrocatalytic hydrogen evolution effect at all pH levels. The researchers used wet chemical impregnation and pyrolysis to anchor SO42− into MoS2 to form 1T-MoS2 and then introduced Pd atoms by simple heat treatment to prepare Pd1/1T-MoS2/C catalyst. The results show that the thin layer 1T-MoS2 is uniformly dispersed on the KBC sheet, Pd is embedded in MoS2 in the form of single atoms, the metal phase is maintained, and the Pd content can reach 7.2 wt%. In the hydrogen evolution reaction (HER), the Pd1/1T-MoS2/C catalyst exhibits excellent catalytic performance. In alkaline electrolytes, the overpotential is as low as 53 mV (current density is 10 mA cm-2), which is close to commercial Pt/C and better than most reported HER catalysts. The Tafel slope is only 37 mV dec-1, and it has the smallest charge transfer resistance. Similarly, the catalyst still has excellent HER activity in acidic and neutral electrolytes.
Application of hydrogen in energy system
The results of precious metal experiments and theoretical calculations prove that Pd-S bonds are generated between Pd atoms and MoS2 and there is charge transfer. The introduction of Pd effectively regulates the electronic structure of the adjacent two-shell S sites in MoS2, making the hydrogen adsorption energy of the S active site close to zero and maintaining the structural stability of the 1T phase, thereby accelerating the HER kinetics. The research results have a driving role in the design and development of low-cost and stable catalysts, which will help reduce greenhouse gas emissions and promote the transformation of energy structure.
Document name: Stabilizing and Activating Active Sites: 1T-MoS2 Supported Pd Single Atoms for Efficient Hydrogen Evolution Reaction
Hydrogen energy is an important part of the future energy system
Chemical Engineering Journal: Pt atomic clusters/MoS2 nanosheets/Co-doped hollow carbon nanofibers high current density hydrogen production
In 2024, Chemical Engineering Journal reported that researchers prepared a highly efficient hybrid electrocatalyst based on Pt atomic clusters (AC)/MoS2 nanosheets/cobalt-doped hollow carbon nanofibers (Pt-MoS2-Co@CHNF) for large-scale hydrogen production.
The content of Pt ACs in the catalyst is 0.46 wt%, which is 43 times lower than commercial Pt/C (20 wt%). Thanks to the Co-doped hollow and layered structure, the prepared Pt-MoS2-Co@CHNF catalyst has a large specific surface area (44.5m2/g), which is conducive to the formation of more active sites and increases the adsorption and contact time between the electrolyte and the catalyst, thereby accelerating the overall alkaline HER.
Experimental results show that in 1 M KOH electrolyte, the Pt-MoS2-Co@CHNF catalyst has an overpotential as low as 91 mV at a current density of 10 mA cm−2 and an overpotential as low as 297 mV at 300 mA cm−2, with a Tafel slope of 78 mV dec-1. In addition, the electrocatalyst also has excellent durability, and the attenuation is negligible after continuous operation at a large current density of 200 mA cm−2 for 14 hours. Pt-MoS2-Co@CHNF has excellent activity and stability for HER, which is better than the previously reported state-of-the-art Co-based and MoS2-based catalysts.
Notably, Pt-MoS2-Co@CHNF as a self-supporting binder-free electrode achieves an ultrahigh current density of 500 mA cm−2 at a low overpotential of 301 mV, and the electrode is stable at 500 mA cm−2 for 24 h in 1 M KOH seawater electrolyte, which represents its great potential for large-scale seawater hydrogen production.
reference: Pt atomic clusters/MoS2 nanosheets/Co-doped hollow carbon nanofibers for high-current–density alkaline hydrogen production.
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