Articles in 2020

CO₂ capture and its electrochemical conversion to valorized products are energy-intense processes. Now, researchers report that judicious control of the electrode interface and reactant transport unlock a lower energy pathway allowing direct conversion of CO₂ from the captured state to CO.

Performance breakthroughs in rechargeable batteries are regularly reported in academic publications. Here the authors closely examine literature data on aluminium batteries and offer a realistic perspective on the technology.

Electrochemical conversion of CO₂ into high-value products is attractive for lowering net carbon emissions. Lee et al. present the valorization of chemisorbed CO₂ to CO in an aqueous monoethanolamine electrolyte via tailoring of the electrochemical double layer, with 72% Faradaic efficiency at 50 mA cm^–2.

Electrochemical reduction of CO₂ is a route to synthesize carbon-based products using renewable energy, but achieving high selectivity to specific molecules remains demanding. Inspired by enzymes, a nanoparticle–ligand assembly is now reported that has a floating interlayer, which enhances CO₂ to CO conversion efficiency.

Energy research works with units and concepts forged in an age of fossil fuel, leading to problem formulations that reinforce current societal practices and patterns of consumption. Achieving low-carbon energy goals depends on shifting demand to match supply and reconceptualizing interactions between time and energy.

Mg-ion diffusion in cathodes and dissociation in electrolyte complexes are sluggish processes that hinder the development of Mg batteries. Now, a new design of both the cathode and the electrolyte drastically improves the kinetics of these processes, leading to a high-power Mg battery.

Owing to sluggish Mg-ion dissociation and diffusion, Mg-based batteries have low power densities. Here the authors carry out rational designs for both the cathode and the electrolyte to enable ultrafast kinetics of a Mg metal battery.

The complex, multi-component environments found in enzymes induce high catalytic specificity, but are difficult to achieve in synthetic catalysts. Now, researchers report a catalyst comprising a dynamic, ordered layer of ligands above a nanoparticle surface that creates a pocket to facilitate CO₂ electroreduction.

Electrocaloric cooling devices traditionally comprise sub-millimetre-thick ceramic working bodies surrounded by relatively massive apparatus. Now, cooling devices that are each based on a thin polymer layer have been stacked to yield a composite lightweight device that pumps heat across a wide temperature span.

Wind energy repowering decisions are multifaceted and depend on the physical, political and social landscape, as factors such as noise regulation, aesthetics and political bargaining can significantly influence project development. Policy should recognise that a technology perspective alone cannot inform implementation pathways and should be supplemented with an understanding of the political and social dimensions.

Renewable energy technologies do not always employ sustainable resources. The scarcity of cobalt supply must be addressed in transportation electrification.

The power conversion efficiency of organic solar cells has rapidly increased, yet significantly less attention has been paid to materials stability and device longevity. For organic solar cells to make an impact in the marketplace, researchers, funding agencies and journals should do more to address this crucial gap.

Given the benefits of improved health and reduced cooking time, women are assumed to unequivocally prefer clean cooking fuels. Now research indicates that women using firewood and those using cleaner alternatives both believe their cooking fuel supports their well-being in several ways, suggesting more complex trade-offs in fuel choices.

The concentration of rooftop solar photovoltaics among high-income households limits deployment and access to benefits. Here the authors find that some policy interventions and business models increased photovoltaic adoption equity in existing markets and shifted deployment to underserved communities.

There is consensus that using firewood negatively impacts women’s well-being, suggesting that clean alternatives will be preferred. However, this study finds that women have different views on how cooking with firewood and LPG support well-being depending on the fuel they currently use.

Two-dimensional Ruddlesden–Popper layered metal-halide perovskites show better performance over three-dimensional versions, but are typically based on quantum wells with random width distribution. Liang et al. show that introducing molten salt spacers gives phase-pure quantum wells and improved solar cell performance.

Households reduced their electricity use the most when they learnt both that they were using more energy than their neighbours and that energy conservation was socially approved. This suggests that efforts to use social information to nudge conservation should combine different types of social feedback to maximize impact.

Social norm interventions are widely used to foster residential resource conservation. Now researchers have shown that the effectiveness of providing information about others’ energy use alongside messages of social approval for energy savings behaviour depends on the strength and consistency of these messages.

Microwave heating has become a useful tool in catalysis to obtain chemical products under unconventional reaction conditions. Now, researchers have demonstrated low-temperature water splitting to produce hydrogen using microwave catalysis and revealed the important role of reduced oxides in the process.