The photoreduction of carbon dioxide (CO2) into renewable synthetic fuels is an attractive approach for generating alternative energy feedstocks that may compete with and eventually displace fossil fuels. However, it is challenging to accurately trace the products of CO2 photoreduction on account of the poor conversion efficiency of these reactions and the imperceptible introduced carbon contamination. Isotope-tracing experiments have been used to solve this problem, but they frequently yield false-positive results because of improper experimental execution and, in some cases, insufficient rigor. Thus, it is imperative that accurate and effective strategies for evaluating various potential products of CO2 photoreduction are developed for the field. Herein, we experimentally demonstrate that the contemporary approach toward isotope-tracing experiments in CO2 photoreduction is not necessarily rigorous. Several examples of where pitfalls and misunderstandings arise, consequently making isotope product traceability difficult, are demonstrated. Further, we develop and describe standard guidelines for isotope-tracing experiments in CO2 photoreduction reactions and then verify the procedure using some reported photoreduction systems. 

/pdf/designing-reliable-and-accurate-isotope-tracer-experiments-2fxxdstm.pdf

Designing reliable and accurate isotope-tracer experiments for CO2 photoreduction

The imperative of solar-driven methodologies, harnessing the virtually boundless power of sunlight, cannot be overstated in our battle against climate change and the imperative to propel clean fuel production. Photocatalytic innovation, which employs catalysts to initiate eco-friendly chemical reactions, stands out as one of these effective techniques. Biochar, a carbon-rich material derived from organic substances, enhances photocatalytic activity through its porous structure and functional groups. Using biochar as a photocatalyst support reduces electron-hole pair recombination rates, narrows band gaps, improves charge separation, and enhances electron transport. This study explores four main objectives: 1) Current approaches in CO2 conversion and strategies, including the management perspective of light, the utilization of solar concentrators, and thermal methods for enhancing solar fuel generation via artificial photosynthesis. 2) Critical role of photocatalysis and analyzing the metals and nonmetals doping and the strategic deployment of carbon materials to increase the efficacy in solar fuel generation. 3) Methods and parameters that affect the synthesis of biochar. 4) The role of biochar as a support for improving photocatalytic activity in CO2 conversion and H2 production for solar fuel generation. This paper outlines a vision for advancing biochar-based photocatalysts, emphasizing the need to enhance their efficiency and stability. It also highlights the potential for innovative design concepts and the exploration of scalable production techniques. Ultimately, this vision aims to drive progress in solar fuel generation technology for practical applications. 

Enhancement strategies in CO2 conversion and management of biochar supported photocatalyst for effective generation of renewable and sustainable solar energy

Doping of Vanadium into Bismuth Oxide Nanoparticles for Electrocatalytic CO2 Reduction

Structure engineering of zirconium-based metal organic frameworks (MOFs) aims to develop efficient catalysts for transforming intermittent renewable energy into value-added chemical fuels. In order to have a deeper understanding of industrial scaling, it is vital to ascertain the favourable operational parameters that are necessary for projecting at the atomic level. The proposed paradigm provides a robust basis for the efficient design of MOFs based heterogeneous photocatalysts. In this study, set of defective MOF (D-NUiO66) was effectively produced using a modular acidic method. Afterwards, the D-NUiO66 was combined with CeO2 to form the D-CeNUiO66 heterojunction for the purpose of carbon dioxide reduction. The morphological aspect of the composite investigation suggested that D-CeNUiO66 had a mesoporous structure with favourable adsorption properties. The optimized D-CeNUiO66 photocatalyst showed the high activity for the reduction of CO2 to CO, with a rate of 38.6 µmolg-1h-1 and demonstrated remarkable repeatability in terms of CO production. The incorporation of defect sites in the D-NUiO66 enhanced the light response to visible light, resulting in reduced band gap of 2.9 eV. The photoelectrochemical tests indicated that the introduction of defects in the UiO66 and coupling CeO2 in the D-CeNUiO66 composite induced fast charge transfer, therefore suppressing the charge recombination rate. This study provides valuable insights into the use of defective engineering and heterojunction approaches to metal-organic frameworks for photocatalytic applications. 

Efficient structure tuning over the defective modulated zirconium metal organic framework with active coordinate surface for photocatalyst CO2 reduction

This review presents the results of research in the field of photocatalytic reduction of carbon dioxide (CO2) to methane and methanol as valuable chemicals and fuels. CO2 reduction is a promising technology, but it is an endothermic process with unfavourable thermodynamics. Other limitations include the inertness of the CO2 molecule, the slow multielectron process, and the lack of understanding of the reaction mechanism, leading to low selectivity and insufficient efficiency. Tailoring reaction parameters such as CO2 adsorption, choice of reducing agent, development of photocatalysts in terms of composition, structural properties and morphology, energy band gap, and the presence of surface functional groups can affect the reaction mechanism and selectivity for the desired product. Therefore, the main challenges in this research area are the development of an active and selective catalyst for the photoreduction of CO2 to useful products with high added value and the optimization and development of a suitable photoreactor that allows successful contact between all key participants in the photocatalytic process. This review is intended to provide guidance for the future development of advanced photocatalysts and photocatalytic systems for CO2 reduction and to enable further breakthroughs in this field.

/pdf/design-and-development-of-photocatalytic-systems-for-1ix7ozzd.pdf

Design and Development of Photocatalytic Systems for Reduction of CO2 into Valuable Chemicals and Fuels

Abstract Solar driven carbon dioxide (CO 2 ) recycling into hydrocarbon fuels using semiconductor photocatalysts offers an ideal energy conversion pathway to solve both the energy crisis and environmental degradation problems. However, the ubiquitous presence of carbonaceous contaminants in photocatalytic CO 2 reduction system and the inferior yields of hydrocarbon fuels raise serious concerns about the reliability of the reported experimental results. Here in this perspective, we focus on the accurate assessment of the CO 2 reduction products, systemically discuss the possible sources of errors in the product quantification, elaborate the common mistakes spread in the analysis of reaction products obtained in 13 CO 2 labelling experiments, and further propose reliable protocols for reporting the results of these isotopic tracing experiments. Moreover, the challenges and cautions in the precise measurement of O 2 evolution rate are also depicted, and the amplification of the concentration of O 2 in photoreactors well above the limit of detection is still demonstrated to be the most effective solution to this troublesome issue. We hope the viewpoints raised in this paper will help to assessment the reliability of the reported data in future, and also benefit the beginners that intend to dive in the photocatalytic CO 2 reduction area. Graphical abstract 

/pdf/current-dilemma-in-photocatalytic-co2-reduction-real-solar-1f3yz2i2.pdf

Current dilemma in photocatalytic CO2 reduction: real solar fuel production or false positive outcomings?

Reactor design for solar-driven photothermal catalytic CO2 reduction into fuels

Probabilistic Features of Photocatalytic CO2 Conversion

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Current dilemma in photocatalytic CO2 reduction: real solar fuel production or false positive outcomings?

Reactor design for solar-driven photothermal catalytic CO2 reduction into fuels

Probabilistic Features of Photocatalytic CO2 Conversion