Browsing by Author "Shikha K. Singh"

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Correction: Enhanced activity and chlorine protection in prolonged seawater electrolysis using MoS2/sulfonated reduced graphene oxide (Sustainable Energy and Fuels (2025) 9 (4300-4319) DOI: 10.1039/D5SE00541H)
(Royal Society of Chemistry, 2025) Prerna Tripathi; Renna Shakir; Amit Kumar Verma; Jeyakumar Karthikeyan; Biswajit Ray; Akhoury Sudhir Kumar Sinha; Shikha K. Singh
The authors regret that the details of the affiliations were not correct in the original manuscript. The corrected affiliations for this paper are as shown herein. The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers. © 2025 The Royal Society of Chemistry.
Enhanced activity and chlorine protection in prolonged seawater electrolysis using MoS2/sulfonated reduced graphene oxide
(Royal Society of Chemistry, 2025) Prerna Tripathi; Renna Shakir; Amit Kumar Verma; Jeyakumar Karthikeyan; Biswajit Ray; Akhoury Sudhir Kumar Sinha; Shikha K. Singh
Electrolyzer technology necessitates the use of seawater instead of freshwater to achieve a comprehensive supply of clean and economical energy. However, the tendency of chloride ions (Cl−) to significantly erode the metal surface is a major challenge during seawater electrolysis. Therefore, designing an electrode that is resistant to chloride ions is of great importance to develop an efficient seawater electrolyser. In this work, we present a double layer anode consisting of a molybdenum sulfide electrocatalyst uniformly deposited over sulfonated graphene sheets coated over an Ni foam. The developed electrode (GNiMoOS) helps selectively convert H2O into H2 and O2 rather than chloride (Cl−) ions into ClO− in a seawater environment by resisting corrosion due to the Cl− ions in seawater. The chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) provides solid evidence that the GNiMoOS electrocatalyst blocks the chloride oxidation reaction owing to its distinct resistance to Cl−. In addition, density functional theory (DFT) calculations clearly validated the preference of sulfonic moieties towards OH− compared with Cl− ions, confirming the chlorine repelling properties of the GNiMoOS electrode. The successful in situ functionalisation of sulfonic moieties into the reduced graphene oxide (RGO) skeleton with simultaneous development of flower-like MoS2 was well confirmed using XPS, Raman, SEM, TEM, and FT-IR techniques. GNiMoOS delivered an impressive current density of 100 mA cm−2 for OER and HER at room temperature, requiring remarkably low overpotentials of just 180 mV and 201 mV, respectively. Industrial faradaic current densities (400-600 mA cm−2) were reported with the active electrode at combined overpotentials of ≤600 mV at room temperature. The unique morphology of MoS2 provides more active sites for the HER/OER, while sulfonated functional groups over graphene impart much-needed anticorrosion properties to the system. Moreover, the electrical coupling between MoS2 and RGO can make the electron transfer to RGO easier. Therefore, the synergistic interactions among MoS2, SO3H and RGO lead to improved catalytic activity and prolonged stability. © 2025 The Royal Society of Chemistry.
Micro-level assessment of agricultural vulnerability to climate variability in Mirzapur District, Uttar Pradesh
(Springer, 2025) Lucky Sharma; Shikha K. Singh; Priyanka Das; Priyanka Gupta; Nikhil Kumar Tiwary; Subham Oraon
The variation in climatic parameters like temperature, precipitation and humidity significantly influences agricultural ecosystem and human societies by affecting crop yield, cropping pattern and overall agricultural practices. Understanding agricultural vulnerability to these variations is crucial for preventing long-term consequences such as food security, changing human settlement patterns and economic instability. Thus, this study attempted to study micro level vulnerability in agriculture in Mirzapur district of Uttar Pradesh. The study aimed to introduce Agriculture Vulnerability Index (AVI) and evaluate the farmer perception about climate change and significant impact on agriculture utilising both primary and secondary data. The primary data was collected from 240 respondent using multistage random stratified sampling. The AVI was computed utilising Shannon Information Entropy method based on four indicators such as exposure to climatic variability, exposure, sensitivity, and adaptive capacity divided into 23 indicators. Ground Water Extraction (17.03%), Agricultural Wasteland (9.92%), Rural population (7.30%), and Barren land (6.21%) disproportionately influenced the agricultural vulnerability. The findings of the study revealed significant variation in agricultural vulnerability in which Hallia, Kon, Nagar, and Pahari block were found to be severely vulnerable to climatic variation. The farmers opinion revealed that the study area is experiencing erratic climatic variation like unseasonal rains and droughts causing serious distress to them. The agricultural landscape has undergone a notable transformation, characterized by a transition to a rice–wheat-gram cropping system, primarily facilitated by enhanced irrigation infrastructure as observed from primary survey. The farmers are compelled to revert to their old system of millet-gram-wheat cropping system due to increased ground water exploitation and present climatic variability. The research underscores the critical imperative of implementing agricultural diversification strategies, drought-resistant crop varieties, micro-irrigation, or policy incentives to mitigate climate vulnerability and improve food sustainability. The study reinforces the farmers opinion-based research to integrate indigenous knowledge system with conventional science-based knowledge to enhance resilience and ensure agricultural development at the micro level. © The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature 2025.