Science AI Journal
Energy · Research topic

Open research questions in Electrocatalysts for Energy Conversion

82 unresolved questions extracted from the limitations and future-work sections of 1,302 Electrocatalysts for Energy Conversion papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Although substantial progress has been achieved in improving the activity and stability of OER electrocatalysts, the interfacial origins of catalytic performance remain insufficiently understood.

    Applications of Nanoscale Electrochemical Characterization Techniques in the Oxygen Evolution Reaction · 2026 · DOI

  • Coupling the cathodic 2e- ORR with the anodic 2e- WOR to realize concerted H2O2 generation via paired electrosynthesis represents a sustainable electrochemical route that simultaneously improves electronic utilization and energy efficiency. Using O2 and H2O as feedstocks, H2O2 can be produced concurrently at both electrodes, which in principle drives the cell-level FE toward the ~200% upper limit and avoids the energy waste associated with employing the low-value OER as a sacrificial anodic process. In recent years, systematic progress has been achieved across both bifunctional electrode catalysts and electrolyzer configurations. Nevertheless, there is a broad consensus that 2e- ORR//WOR concerted H2O2 production remains largely at the laboratory proof-of-concept stage, and several critical gaps must still be closed before engineering-scale implementation. Firstly, prioritizing the 2e- WOR pathway as the key breakthrough involves enhancing its selectivity, activity, and high-current compatibility. Relative to 2e- ORR, the efficiency and selectivity of 2e- WOR are more likely to constitute the bottleneck at the full-cell level, and deficiencies on the anodic side can directly cap the overall performance of paired systems. Future efforts should therefore advance in parallel along (i) suppression of competing reaction pathways; and (ii) regulation of key intermediate adsorption/turnover, with particular emphasis on maintaining 2e- WOR selectivity at high current densities through material design and scalable electrode engineering. Additionally, a critical future direction lies in resolving the incompatibility of disparate electrolytes. This can be achieved through the rational design of membranes and robust solid-state electrolytes, which are pivotal for minimizing cross-contamination and enabling the continuous production of high-purity H2O2. Prior studies have underscored the need for ion-transport membranes, while also noting that electrocatalytically produced H2O2 is frequently contaminated with electrolytes, which limits downstream utilization. Consequently, solid-state electrolytes and pure-water Lu et al. Energy Mater. 2026, 6, 600079 Page 23 of 30 Figure 10. Paired electrosynthesis of H2O2: from lab to application operation are promising directions. In light of progress in polymer solid electrolytes and MEA concepts for H2O2 electrosynthesis, it is plausible that new electrolyzer paradigms will emerge for distributed production, featuring low electrolyte carryover or even electrolyte-free operation. And, the interplay between mechanism and characterization provides operando evidence, establishing a direct link between the 2e- ORR//WOR synergy and the mitigation of side reactions. On the WOR side, bicarbonate/carbonate electrolytes may involve mediator pathways such as carbonate radicals and percarbonate species.

    Coupling oxygen reduction and water oxidation for concerted H<sub>2</sub>O<sub>2</sub> production: a sustainable paired-electrosynthesis strategy · 2026 · DOI

  • Recently, integrating rare-earth metal oxides with two-dimensional (2D) MXenes has emerged as an efficient strategy for assembling advanced hybrid composites for the hydrogen evolution reaction (HER), but the influence of synthesis strategies on their resulting properties remains unclear.

    Effect of In-situ/Ex-situ Hydrothermal Routes on Electrocatalytic Hydrogen Evolution Performance of CeO2/N-Ti3C2Tx Composites · 2026 · DOI

  • While significant efforts have been dedicated to phase regulation of active metals, the role of crystal phase of catalyst supports in steering the hydrogen migration during hydrogen evolution reaction (HER) remains underexplored.

    Crystal Phase Engineering Accelerates Hydrogen Reverse Spillover for Efficient Alkaline Hydrogen Production · 2026 · DOI

  • However, the activity and stability of Ni‐based electrocatalysts for the anodic urea oxidation reaction (UOR) are limited by the lack of active NiOOH and strong intermediates adsorption.

    Enriched and Sustained Oxygen Vacancies in Amorphous NiWO <sub>x</sub> Enhance and Stabilize Urea Electrooxidation · 2026 · DOI

  • Based on the findings of this study, the following recommendations are proposed: i. Reduced graphene oxide (rGO) and nitrogen-doped reduced graphene oxide (N-rGO) should be further explored as promising support materials for palladium electrocatalysts in direct methanol fuel cell (DMFC) applications due to their enhanced electrocatalytic activity, improved conductivity, and better stability compared to conventional carbon supports. ii. Further studies should investigate the long-term durability and stability of Pd/rGO and Pd/N-rGO catalysts under extended operational conditions to evaluate their practical applicability in commercial DMFC systems. https://akasa.com.ng Vol.

    <b>Effect of reduction reaction on graphene-based support materials for palladium catalyst in direct methanol fuel cell</b><b></b> · 2026 · DOI

  • An important limitation identified in the literature is the absence of unified reporting criteria: key exper- imental parameters, such as electrolyte composition, operating temperature, reference current density, and the conditions of durability tests, are often described inconsistently or exhibit wide variability, which restricts comparability and complicates extrapolation to larger scales. In addition, cross-study comparison remains limited by the heterogeneity in the definition and evaluation of long-term performance, the incomplete information available for assessing the energy associated with the treatment, and the non-uniform reporting of surface-related parameters.

    Activation protocols for stainless steel in alkaline water electrolysis: trends and limitations · 2026 · DOI

  • Despite the significant advancements, a number of the critical challenges must be addressed to enable the practical deployment of the electrocatalyst for large-scale water splitting. A major limitation lies in achieving the stable operations at industrially relevant current densities (>500 mA cm−2) while retaining low overpotentials. Despite the exceptionally high-current-density stability of the LDH-based systems, their performance is largely restricted to that of the alkaline environments. This emphasizes the urgent need for the pH-universal catalysts that are capable of stable operation in both of the acidic and alkaline solutions for sustainable hydrogen production. The performance analysis across the various materials classes further suggested that interface engineering and the hybrid system design represent key directions for the future research and development (Chauhan et al., 2025). Conductive, self-supported architectures such as metal foambased systems due to their low-density, high porosity and high volumetric surface area, increase the active site accessibility, promote efficient charge structural robustness under the extended electrocatalytic cycles (Novais et al., 2025). Integrating such platforms with the functional materials (such as MOFs, COFs, LDHs, graphene, etc.) offers an intriguing opportunity complementary characteristics including the customizable electronic structures and enhance catalytic kinetics. transfer and combine improve their to the electrocatalytic operations remains Additionally, the dynamic evolution of the catalyst surfaces insufficiently during the pre-catalysts undergo undergoes understood. Many of irreversible surface reconstruction into the amorphous (oxy) hydroxides under the high anodic potentials (particularly in OER) that serve as the active species.

    Advanced materials for high-performance electrochemical water-splitting: a review of recent breakthroughs, and future prospects · 2026 · DOI

  • The adsorption strength of ADASCs toward key intermediates (e.g., *OOH, *O, *OH) tends to deviate due to insufficient precision in d-band center modulation.

    Engineering of Asymmetric Dual-Atom Sites for Effective Oxygen Electrocatalysis · 2026 · DOI

  • The geographic paradox where 60% of high renewable energy potential regions (Australia, Spain, North Africa) face water stress requires location-specific techno-economic analysis comparing Proton Exchange Membrane (PEM) electrolyzer water purity requirements (>18 M Ohms-cm resistivity, <10 ppb silica) against freshwater availability and desalination coupling economics.

    A critical review of the production pathways and storage limitations and economic feasibility of green hydrogen fuel · 2026 · DOI

  • The Water-Energy-Hydrogen Nexus coupling of seawater desalination (Reverse Osmosis and Electrode ionization) with coastal electrolysis centers has been proposed but lacks field validation data on actual levelized cost of hydrogen (LCOH) increases, energy consumption (3.5-4.2 kWh/m³), and long-term electrolyzer performance under desalted seawater conditions.

    A critical review of the production pathways and storage limitations and economic feasibility of green hydrogen fuel · 2026 · DOI

  • Solid Oxide Electrolysis (SOEC) and Anion Exchange Membrane Electrolysis (AEMEL) technologies must achieve the $1.50-2.00/kg price parity target by 2030 through integration of industrial waste heat and non-precious metal catalysts, but techno-economic optimization pathways remain unvalidated at commercial scale.

    A critical review of the production pathways and storage limitations and economic feasibility of green hydrogen fuel · 2026 · DOI

  • Standardized high-pressure pipeline infrastructure specifications for hydrogen transport have not been established to mitigate long-term hydrogen embrittlement degradation. Technical standards and materials testing protocols are needed to reduce pipeline failure risks in large-scale green hydrogen distribution networks.

    A critical review of the production pathways and storage limitations and economic feasibility of green hydrogen fuel · 2026 · DOI

  • High-enthalpy adsorbents for room-temperature hydrogen storage without the weight penalty of glass microspheres have not been engineered or validated at scale. Development and testing of novel adsorbent materials that enable practical hydrogen storage without cryogenic cooling requirements is a critical gap in green hydrogen storage technology.

    A critical review of the production pathways and storage limitations and economic feasibility of green hydrogen fuel · 2026 · DOI

  • Oxygen-tolerant hydrogenases for biological hydrogen production pathways have not been developed to close the existing 80% yield gap in current algal-based green hydrogen systems. Research is needed to engineer hydrogenase variants that can operate efficiently in the presence of oxygen to improve the practical viability of biological hydrogen generation.

    A critical review of the production pathways and storage limitations and economic feasibility of green hydrogen fuel · 2026 · DOI

  • Subsequent research in electrochemical sensing could benefit from standardised calibration procedures to improve the comparability and reproducibility of data across different laboratories. Detailed composite design, the optimisation of modifier type, morphology, and loading, is essential for achieving maximum sensitivity and stability. Synthesis of experimental efforts with density func- tional theory simulations provides a useful understanding of electrode-analyte interactions, allowing rational design of sensing platforms. Lastly, ongoing reporting of critical parameters like electroactive surface area, diffusion coefficients, and Randles-Ševčík analysis will enhance the dependability of comparative evaluations and progress the field toward normalized evaluation tools.

    Transition metal oxide-modified carbon electrodes: A comprehensive review on surface area modulation and Randles-Ševčik electrochemical insights · 2026 · DOI

  • The methodology section describes detailed characterization techniques (operando FTIR, EIS, NMR, ion chromatography) but does not discuss long-term stability testing or durability assessment of the catalysts.

    Decoupling charge‒discharge electrolysis for hydrogen evolution and organic oxidation reactions · 2026 · DOI

  • The coupled ORR//MOR system employed PtRu/C as the counter electrode; exploration of alternative non-precious metal counter electrodes for cost-effectiveness at industrial scale is needed.

    Active site design enables industrial scale H2O2 electrosynthesis with metal-free catalysts · 2026 · DOI

  • The AIMD simulations were limited to 5 ps at 298.15 K; longer simulation times at varied temperatures relevant to industrial operation would strengthen stability assessments.

    Active site design enables industrial scale H2O2 electrosynthesis with metal-free catalysts · 2026 · DOI

  • DFT calculations were performed on simplified graphene-based models with periodic boundary conditions; the applicability of these theoretical predictions to real catalyst materials with surface defects, dopant non-uniformity, and amorphous regions needs validation.

    Active site design enables industrial scale H2O2 electrosynthesis with metal-free catalysts · 2026 · DOI

  • Stability testing involved electrode replacement at 5, 10, or 25-hour intervals, but long-term durability performance beyond these timeframes and under continuous industrial operation conditions remains unexplored.

    Active site design enables industrial scale H2O2 electrosynthesis with metal-free catalysts · 2026 · DOI

  • • Future work should focus on high-current testing, scalable synthesis, structural and interfacial engineering, heteroatom doping, and operando characterization, with hybrid or hierarchical electrodes combining atomic-level activity and macroscopic durability for practical alkaline HER.

    Non-noble metal catalysts for the alkaline hydrogen evolution reaction: a review · 2026 · DOI

  • Despite significant progress in efficient nickel‐based catalysts, the fundamental issues regarding product selectivity control and dissociation mechanism during the UOR process have not been clarified.

    Electron Delocalized Ni Active Sites in Spinel Catalysts Enable Efficient Urea Oxidation · 2024 · DOI

  • However, several critical aspects of M–N–C SACs in ORR remain poorly understood, including their pH-dependent activity, selectivity for 2- or 4-electron transfer pathways, and the identification of the rate-determining steps.

    Unraveling the pH-Dependent Oxygen Reduction Performance on Single-Atom Catalysts: From Single- to Dual-Sabatier Optima · 2024 · DOI

  • offer advancements Over recent decades, there has been significant progress in the development of catalyst dynamic transformation, encompassing the exploration of the origins, underlying principles, identification methods, and targeted tailoring of the dynamic transformations. These substantial potential for engineering the dynamic transformation to design efficient and durable photo/electrocatalysts. This comprehensive overview systematically explored such issues and identified several approaches and important triggering factors for the dynamic transformation and its applications in photo/electrocatalysis. It should be noted that reconstruction of catalysts is induced by single atom dopants, defects (vacancies, dopants, grain boundaries, etc.), heterostructures, leaching and crystallinity, which correspond to scales ranging from the atomistic This journal is © The Royal Society of Chemistry 2024Energy Environ. Sci., 2024, 17, 6435–6481 | 6473Open Access Article. Published on 26 July 2024. Downloaded on 6/14/2026 9:09:12 AM.

    Dynamic transformation of active sites in energy and environmental catalysis · 2024 · DOI

Most-cited papers in Electrocatalysts for Energy Conversion

Most recent work

Find a gap in your own Electrocatalysts for Energy Conversion sub-topic

This page shows what the Electrocatalysts for Energy Conversion literature already flags as unresolved. To narrow it to your specific question, run the guided finder — it searches the gap library on demand and checks candidates against 250M+ OpenAlex works.

Open the Research Gap Finder →

Related topics in Energy

Advanced Photocatalysis Techniques
45 open questions
CO2 Reduction Techniques and Catalysts
31 open questions
Global Energy Security and Policy
27 open questions
Algal biology and biofuel production
27 open questions
82 open questions have been extracted from the limitations and future-work passages of 1,302 Electrocatalysts for Energy Conversion papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

Tools for your next paper

Gaps & Literature SearchFind open questions in any field — 120,000+ open gaps mined from our own library.Pre-CheckIs your paper ready? A Tier 1–5 acceptance probability in seconds.Journal FinderA ranked shortlist of target journals from a 17,500-venue index.Duplicate Publication CheckerCheck prior-publication & salami-slicing risk across 8 sources.Citation GeneratorFreeA DOI or title → APA, MLA, Vancouver, Chicago, BibTeX, RIS. No signup.Graphical Abstract MakerFreeTurn your findings into a colorblind-safe graphical abstract.

Compare the category — Honest roundups of the AI research tools, ours listed alongside the alternatives.

Command palette

Jump anywhere, run any action.