Lokanath Neratur Krishnappagowda

Bio: Lokanath Neratur Krishnappagowda is an academic researcher from University of Mysore. The author has contributed to research in topics: Photocatalysis & Hydrogen bond. The author has an hindex of 5, co-authored 17 publications receiving 60 citations.

Rational design of 2D TiO2-MoO3 Step-scheme heterostructure for boosted photocatalytic overall water splitting

Abstract: Designing of step-scheme (S-scheme) heterostructure photocatalyst is a promising strategy for the high utilization of photogenerated charge carriers. Herein, a novel S-scheme two-dimensional (2D) TiO2-MoO3 heterojunction photocatalyst is fabricated by...

Emerging S‐Scheme Photocatalyst

Abstract: Photocatalysis is a green technology to use ubiquitous and intermittent sunlight. The emerging S-scheme heterojunction has demonstrated its superiority in photocatalysis. This article covers the state-of-the-art progress and provides new insights into its general designing criteria. It starts with the challenges confronted by single photocatalyst from the perspective of energy dissipation by borrowing the common behaviors in the dye molecule. Subsequently, other problems faced by single photocatalyst are summarized. Then a viable solution for these problems is the construction of heterojunctions. To overcome the problems and mistakes of type-II and Z-scheme heterojunctions, S-scheme heterojunction is proposed and the underlying reaction mechanism is summarized. Afterward, the design principles for S-scheme heterojunction are proposed and four types of S-scheme heterojunctions are suggested. Following this, direct characterization techniques for testifying the charge transfer in S-scheme heterojunction are presented. Finally, different photocatalytic applications of S-scheme heterojunctions are summarized. Specifically, this work endeavors to clarify the critical understanding on curved Fermi level in S-scheme heterojunction interface, which can help strengthen and advance the fundamental theories of photocatalysis. Moreover, the current challenges and prospects of the S-scheme heterojunction photocatalyst are critically discussed.

Challenges of Z-scheme photocatalytic mechanisms

Abstract: Z-scheme photocatalytic systems have been extensively studied since they are supposed to promote carrier separation while boosting redox abilities. Herein, we analyze the challenges of photocatalytic mechanisms in liquid-phase and all-solid-state Z-scheme systems from various perspectives, including thermodynamics, charge-transfer dynamics, applicability, and practical synthesis. Notably, in this opinion, we analyze the challenges for electron transfer in liquid-phase Z-scheme systems, where photocatalyst nanoparticles (NPs) and redox couples are constantly under dynamic motion and the transfer of free electrons via water media is prohibited. These problems ultimately led to the flourishing of step-scheme (S-scheme) heterojunctions.

Review on g-C3N4-based S-scheme Heterojunction Photocatalysts

Abstract: • Review of recent advances in g-C 3 N 4 -based S-scheme heterojunction photocatalysts. • The basic theory and preparation strategy of g-C 3 N 4 -based S-scheme heterojunctions are discussed. • The potential applications of g-C 3 N 4 S-scheme heterojunctions are reviewed. • The possible tendency of g-C 3 N 4 -based S-scheme heterojunctions is proposed. With the rapid development of economy and modern industry, serious environmental pollution and energy shortage have become major urgent challenges to the human society. Photocatalysis is a promising technology to provide green energy. As a typical metal-free polymer photocatalyst, g-C 3 N 4 has attracted more and more attention due to its excellent performance. Unfortunately, the fast recombination of photo-induced charges, limited light response range as well as weak oxidation ability are still the key drawback that restrict the photocatalytic performance of g-C 3 N 4 . These problems can be effectively addressed by constructing g-C 3 N 4 -based heterojunctions with two or more semiconductor materials, during which the respective advantages can be integrated. Up to now, the various oxidation semiconductor photocatalysts have been tried to construct the novel S-scheme heterojunction photocatalysts with g-C 3 N 4 . Thus, this review provides a comprehensive introduction of g-C 3 N 4 -based S-scheme heterojunctions, including the main characteristics of the S-scheme heterojunction, photocatalytic mechanisms, design rules and preparation methods of g-C 3 N 4 -based S-scheme heterojunction photocatalysts. Moreover, this review summarizes recently reported works on the potential applications of g-C 3 N 4 -based S-scheme photocatalysts in various important photocatalytic reactions, including photocatalytic hydrogen production, photocatalytic degradation of contaminants, photo-reduction of CO 2 into fuels, and photocatalytic sterilization. Finally, based on the current research progress, we propose some shortages in the preparation methods and applications of g-C 3 N 4 -based S-scheme heterojunctions, which are to be further investigated and resolved in this promising and creative research field.