Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization.

Developing highly efficient and durable hydrogen evolution reaction (HER) electrocatalysts is crucial for addressing the energy and environmental challenges. Among the 2D-layered chalcogenides, MoSe2 possesses superior features for HER catalysis. The van der Waals attractions and high surface energy, however, stack the MoSe2 layers, resulting in a loss of edge active catalytic sites. In addition, MoSe2 suffers from low intrinsic conductivity and weak electrical contact with active sites. To overcome the issues, this work presents a novel approach, wherein the in situ incorporated diethylene glycol solvent into the interlayers of MoSe2 during synthesis when treated thermally in an inert atmosphere at 600 °C transformed into graphene (Gr). This widened the interlayer spacing of MoSe2, thereby exposing more HER active edge sites with high conductivity offered by the incorporated Gr. The resulting MoSe2-Gr composite exhibited a significantly enhanced HER catalytic activity compared to the pristine MoSe2 in an acidic medium and demonstrated a superior HER catalytic activity compared to the state-of-the-art Pt/C catalyst, particularly at a high current density beyond ca. 55 mA cm-2. Additionally, the MoSe2-Gr catalyst demonstrated long-term electrochemical stability during HER. This work, thus, presents a facile and novel approach for obtaining an efficient MoSe2 electrocatalyst applicable in green hydrogen production.

Socioeconomic inequalities in post-natal health checks for the newborn in Vietnam.

BACKGROUND: The newborn and child death associated with inadequate post-natal health checks continued to be a significant issue across the world. This study aimed to assess the socioeconomic inequalities in post-natal health checks for the newborn in Vietnam in 2014. METHODS: We used the secondary data from the Multiple Indicator Cluster Survey in 2014. We included women aged 15-49 years who had a live birth within two years of the time of the interview. We estimated the concentration index to measure socioeconomic inequalities post-natal health checks for the newborn. We conducted multiple logistic regression analysis to identify factors associated with post-natal health checks for the newborn. RESULTS: Overall, the proportion of post-natal health checks for the newborn in Vietnam was 89.1%. The concentration index of post-natal health checks for the newborn was positive at 0.06. It indicated that the newborns in the rich households were more likely to get post-natal health checks as compared to in the poor households. The common factors significantly associated with the higher percentage of post-natal health checks for the newborn were women belonging to the Kinh and Hoa ethnic, higher education, and wealthier groups. CONCLUSION: Socioeconomic inequalities in post-natal health checks for the newborn in Vietnam were not strong, but it still existed. Thus, we recommended that policy efforts to increase access to post-natal health services for poor women. In addition, there is a need to improve access to post-natal health services for women belonging to minor ethnic group and low education.

Comparison of Doppler-Guided Transanal Hemorrhoidal Dearterialization for Grade III and IV Hemorrhoids in Vietnam.

INTRODUCTION: This study aimed to assess the short- and long-term outcomes of Doppler-guided transanal hemorrhoidal dearterialization (THD) for grade III and IV hemorrhoidal disease in Vietnam. METHODS: In a prospective observational design, patients treated for grade III and IV hemorrhoidal disease with the THD method at the National Hospital of Traditional Medicine (Hanoi, Vietnam) were included between June 2012 and December 2013. Patients were evaluated postoperatively at the time they were discharged from the hospital (short-term outcome) and 6 months after surgery (long-term outcome). RESULTS: A total of 128 patients were enrolled in the study, 94 were classified with grade III disease and 34 with grade IV. Grade IV hemorrhoidal patients reported on average 18.2 years of disease symptom duration, while grade III hemorrhoidal patients reported 11.2 years. All patients with grade III and grade IV hemorrhoidal disease had good outcomes at discharge day and reported to return to work in a median of 6 days after THD. At long-term follow-up, the results were good for 80.9% of patients from grade III hemorrhoidal disease and 61.8% of patients from grade IV hemorrhoidal disease. Patient satisfaction with the procedure and outcomes was 93.6% for grade III and 85.3% for grade IV hemorrhoidal patients. CONCLUSIONS: The THD technique was shown to be safe for both grade III and IV hemorrhoidal patients. The THD technique showed better results with grade III hemorrhoidal patients as compared to grade IV hemorrhoidal patients.