# Most-cited Energy papers of 2019, with free PDFs

The 25 most-cited Energy research papers published in 2019, ranked by citations in OpenAlex, with their original abstracts and free PDFs where available.

1. [Progress and Perspectives of Electrochemical CO2 Reduction on Copper in Aqueous Electrolyte](https://nerdi.pages.dev/paper/W2947264857) · 5,193 citations
2. [Recent Advances in Electrocatalytic Hydrogen Evolution Using Nanoparticles](https://nerdi.pages.dev/paper/W2982516344) · 3,152 citations
3. [What would it take for renewably powered electrosynthesis to displace petrochemical processes?](https://nerdi.pages.dev/paper/W2941803205) · 3,044 citations · Free PDF
4. [Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies](https://nerdi.pages.dev/paper/W2967197658) · 2,835 citations
5. [Cocatalysts for Selective Photoreduction of CO 2 into Solar Fuels](https://nerdi.pages.dev/paper/W2913379862) · 2,320 citations
6. [Hydrogen production by PEM water electrolysis – A review](https://nerdi.pages.dev/paper/W2947992368) · 2,158 citations
7. [Fundamentals of TiO 2 Photocatalysis: Concepts, Mechanisms, and Challenges](https://nerdi.pages.dev/paper/W2969329578) · 1,908 citations
8. [Self‐Supported Transition‐Metal‐Based Electrocatalysts for Hydrogen and Oxygen Evolution](https://nerdi.pages.dev/paper/W2925416586) · 1,753 citations
9. [Recent progress made in the mechanism comprehension and design of electrocatalysts for alkaline water splitting](https://nerdi.pages.dev/paper/W2954281353) · 1,710 citations
10. [Atomically dispersed Fe 3+ sites catalyze efficient CO 2 electroreduction to CO](https://nerdi.pages.dev/paper/W2949697738) · 1,616 citations
11. [Production of Hydrogen Peroxide by Photocatalytic Processes](https://nerdi.pages.dev/paper/W2979216702) · 1,597 citations
12. [Engineering bunched Pt-Ni alloy nanocages for efficient oxygen reduction in practical fuel cells](https://nerdi.pages.dev/paper/W2987957259) · 1,542 citations
13. [Nanoarchitectonics for Transition‐Metal‐Sulfide‐Based Electrocatalysts for Water Splitting](https://nerdi.pages.dev/paper/W2915561739) · 1,408 citations
14. [Recommended Practices and Benchmark Activity for Hydrogen and Oxygen Electrocatalysis in Water Splitting and Fuel Cells](https://nerdi.pages.dev/paper/W2910274140) · 1,366 citations
15. [Large-scale storage of hydrogen](https://nerdi.pages.dev/paper/W2929651773) · 1,358 citations
16. [Non-noble metal-nitride based electrocatalysts for high-performance alkaline seawater electrolysis](https://nerdi.pages.dev/paper/W2989011156) · 1,339 citations · Free PDF
17. [Electrochemical CO 2 Reduction into Chemical Feedstocks: From Mechanistic Electrocatalysis Models to System Design](https://nerdi.pages.dev/paper/W2944826525) · 1,334 citations · Free PDF
18. [Toward practical solar hydrogen production – an artificial photosynthetic leaf-to-farm challenge](https://nerdi.pages.dev/paper/W2921275266) · 1,327 citations
19. [Direct Electrolytic Splitting of Seawater: Opportunities and Challenges](https://nerdi.pages.dev/paper/W2923120862) · 1,264 citations
20. [Dual Cocatalysts in TiO2 Photocatalysis](https://nerdi.pages.dev/paper/W2947943028) · 1,257 citations
21. [Recent advances in metal sulfides: from controlled fabrication to electrocatalytic, photocatalytic and photoelectrochemical water splitting and beyond](https://nerdi.pages.dev/paper/W2951722599) · 1,211 citations
22. [Direct electrosynthesis of pure aqueous H 2 O 2 solutions up to 20% by weight using a solid electrolyte](https://nerdi.pages.dev/paper/W2979563681) · 1,210 citations
23. [Robust noble metal-based electrocatalysts for oxygen evolution reaction](https://nerdi.pages.dev/paper/W2945411159) · 1,168 citations
24. [CO 2 reduction on gas-diffusion electrodes and why catalytic performance must be assessed at commercially-relevant conditions](https://nerdi.pages.dev/paper/W2909300313) · 1,135 citations
25. [Architecting highly hydratable polymer networks to tune the water state for solar water purification](https://nerdi.pages.dev/paper/W2953719859) · 1,097 citations

Canonical page: https://nerdi.pages.dev/papers/energy/most-cited-2019