The nanostructured materials offer various advantages as they provide more flexible space for ease reconstruction, as their nanosize expands the limits and results in confinement effect, enhanced mechanical stability, and large surface area, and make them suitable for photocatalytic activities. The advancement in synthesis techniques provides the freedom to alter its physical properties as per the demand. This article provides a 360° view point on the nanomaterials which are used for solar energy harnessing with respect to environmental and energy application. The discussion emphasizes on various synthesis methods of nanostructured materials, their mechanistic features, usage in demanding applications such as photosplitting of water for hydrogen production, artificial photosynthesis, and water and wastewater treatment with an endnote highlighting the future scope of nanomaterials for real-world applications.

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The wearable healthcare equipment is primarily designed to alert patients of any specific health conditions or to act as a useful tool for treatment or follow-up. With the growth of technologies and connectivity, the security of these devices has become a growing concern. The lack of security awareness amongst novice users and the risk of several intermediary attacks for accessing health information severely endangers the use of IoT-enabled healthcare systems. In this paper, a blockchain-based secure data storage system is proposed along with a user authentication and health status prediction system. Firstly, this work utilizes reversed public-private keys combined Rivest–Shamir–Adleman (RP2-RSA) algorithm for providing security. Secondly, feature selection is completed by employing the correlation factor-induced salp swarm optimization algorithm (CF-SSOA). Finally, health status classification is performed using advanced weight initialization adapted SignReLU activation function-based artificial neural network (ASR-ANN) which classifies the status as normal and abnormal. Meanwhile, the abnormal measures are stored in the corresponding patient blockchain. Here, blockchain technology is used to store medical data securely for further analysis. The proposed model has achieved an accuracy of 95.893% and is validated by comparing it with other baseline techniques. On the security front, the proposed RP2-RSA attains a 96.123% security level.

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The microbial fuel cell (MFC) a classification of fuel cell has attracted wide research attention for resolving the emerging energy and environmental crisis of present and future generation. Owing to its strong compliances towards sustainable development goal and safety it is seen as a promising substitution for the polluting technologies. Though this technology has seen tremendous growth in their own technological competence their commercialisation is unrealistic on instantaneous adaptation. The opinion covers the protagonist role of MFC in providing solution to the energy and environmental problems along with its limitations and its competence for future real time application.

Microbial fuel cell technology that works on the principle of resource recovery has gained wide popularity among the scientific world. These MFCs were seen as a solution provider for the present day's energy crisis through a non-traditional sustainable way. Although immense research has marked the development of this system since its innovation, the technol-ogy has not competed the commercial implication owing to various associated materialistic and operating limitations. The perspective provides an overview of the various limitations faced that constraints its real-time application along with perspective solutions.