CoSe₂ Nanoparticles Grown on Carbon Fiber Paper: An Efficient and Stable Electrocatalyst for Hydrogen Evolution Reaction

Development of a non-noble-metal hydrogen-producing catalyst is essential to the development of solar water-splitting devices. Improving both the activity and the stability of the catalyst remains a key challenge. In this Communication, we describe a two-step reaction for preparing three-dimensional electrodes composed of CoSe₂ nanoparticles grown on carbon fiber paper. The electrode exhibits excellent catalytic activity for a hydrogen evolution reaction in an acidic electrolyte (100 mA/cm² at an overpotential of ∼180 mV). Stability tests though long-term potential cycles and extended electrolysis confirm the exceptional durability of the catalyst. This development offers an attractive catalyst material for large-scale water-splitting technology

Electrochemical Tuning of MoS₂ Nanoparticles on Three-Dimensional Substrate for Efficient Hydrogen Evolution

Molybdenum disulfide (MoS₂) with the two-dimensional layered structure has been widely studied as an advanced catalyst for hydrogen evolution reaction (HER). Intercalating guest species into the van der Waals gaps of MoS₂ has been demonstrated as an effective approach to tune the electronic structure and consequently improve the HER catalytic activity. In this work, by constructing nanostructured MoS₂ particles with largely exposed edge sites on the three-dimensional substrate and subsequently conducting Li electrochemical intercalation and exfoliation processes, an ultrahigh HER performance with 200 mA/cm² cathodic current density at only 200 mV overpotential is achieved. We propose that both the high surface area nanostructure and the 2H semiconducting to 1T metallic phase transition of MoS₂ are responsible for the outstanding catalytic activity. Electrochemical stability test further confirms the long-term operation of the catalyst

Clinical characteristics of ICP and control groups.

<p>The data are expressed as the mean ± S.D., *<i>p</i><0.05 vs. control group, **<i>p</i><0.01 vs. control group. Χ²-test was used to evaluate the comparisons of the rates, *<i>p</i><0.05 vs. control group, **<i>p</i><0.01 vs. control group.</p

Expression of PPARγ and NF-κB protein in placentas from control group and ICP groups.

<p>(A) Western blotting analysis of placental PPARγ and NF-κB protein expression in control, mild ICP and sever ICP groups. (B) Graphical summary of data on the expression of PPARγ protein. (C) Graphical summary of data on the expression of NF-κB protein. The data are expressed as the mean ± S.D., **<i>p</i><0.01 vs. control group.</p

Expression of PPARγ andNF-κB mRNA in cultured HTR-8/SVneo cell.

<p>(A) RT-PCR analysis of placental PPARγ and NF-κB mRNA expression in control, mild ICP and sever ICP group. (B) Graphical summary of data on the expression of PPARγ mRNA. (C) Graphical summary of data on the expression of NF-κB mRNA. The data are expressed as the mean ± S.D., ^##<i>p</i><0.01vs. control group, **<i>p</i><0.01 vs. TCA 10 µM/L group.</p

Expression of PPARγ and NF-κB protein in cultured HTR-8/SVneo cell.

<p>(A) Western blotting analysis of placental PPARγ and NF-κB protein expression in control, mild ICP and sever ICP group. (B) Graphical summary of data on the expression of PPARγ mRNA. (C) Graphical summary of data on the expression of NF-κB protein. The data are expressed as the mean ± S.D., ^##<i>p</i><0.01vs. control group, **<i>p</i><0.01 vs. TCA10 µM/L group.</p

Expression of PPARγ and NF-κB mRNA in placentas from control group and ICP groups.

<p>(A) RT-PCR analysis of placental PPARγ and NF-κB mRNAexpression in control, mild ICP and sever ICP groups. (B) Graphical summary of data on the expression of PPARγ mRNA. (C) Graphical summary of data on the expression of NF-κB mRNA. The data are expressed as the mean ± S.D., **<i>p</i><0.01 vs. control group.</p

Serum biochemical characteristics of ICP and control groups.

<p>The data are expressed as the mean ± S.D., **p<0.01 vs. control group.</p

Serum biochemical characteristics of ICP and control groups.

<p>The data are expressed as the mean ± S.D., **<i>p</i><0.01 vs. control group.</p

PPARγ and NF-κB staining were found in the membrane and cytoplasm of placental trophoblast cell.

<p>×400 (A–C) PPARγ protein expressed in the placenta of control patients, mild ICP patients and severe ICP patients. (D–F) NF-κB protein expressed in the placenta of control patients mild ICP patients and severe ICP patients. PPARγ and NF-κB proteins expression were significantly different in control group and ICP groups.</p