The cover is an artist’s depiction of efficient N₂ electroreduction to ammonia by F‐doped porous carbon framework catalysts. F atoms (yellow spheres) bonding to carbon atoms (grey spheres) create Lewis acid sites to enhance the repulsive interaction with protons for suppressing H₂ evolution, thus enhancing the selectivity of N₂ electroreduction into NH₃ (purple represents for N and pink represents for H).

The cover is a family of pyrochlore oxides R₂Ir₂O₇ (R = rare earth ions) as acidic oxygen-evolving catalysts with superior specific activities. For R₂Ir₂O₇, the lattice expansion with R ionic radius (the blue sphere) is generally attributed to the increase in Ir–O–Ir bond angle via chemical pressure effect, which is thought to be responsible for the high OER activity.

The cover is an artist's depiction of single-atom catalysts. The curved surface represents the MoS₂ surface decorated with different types of Pt single atoms.

The cover is an artist’s depiction of efficient N₂ electrochemical reduction to ammonia by Ru single-atom catalysts. The wine red sphere (Ru atoms) was uniformly distributed on nitrogen-doped carbon (blue represents for N and gray represents for C). With the help of electricity, the nitrogen was successfully reduced into ammonia (white represents for H).

The cover is an artist's depiction of CO₂ hydrogenation to methanol via synergy between neighbouring Pt monomers. The curved surface represents the MoS₂ surface decorated with different types of neighbouring Pt monomer. The yellow sphere (S atom) between neighbouring white spheres (Pt atoms) is shining, as a reflection of a synergetic interaction.

It shows the dependence of hydrogen production on metal-insulator phase transition, where the red fish as a representative of metallic support exhales more hydrogen bubbles than the dark one for insulator. The catalytic performance in ammonia borane hydrolysis was directly correlated with the highest occupied state of Rh single atoms, which was determined by the band structure of supports.

This cover was designed by Lin Lin for an article published in Angew. Chem. Int. Ed. (Volume 55, Issue 33. August 8, 2016). It shows the lightning conductors with a sharp tip to attract lightning, reflecting the sharp-tip effect in the macroscopic world. Pt₃Co octapods were the most efficient catalysts for CO₂ hydrogenation owing to the presence of multiple sharp tips (the“sharp-tip effect”) and charge transfer between Pt and Co, which leads to the accumulation of negative charge in the vertices.

It shows how N dopants are tailored in the form of both substitutional and pyrrolic N in graphene quantum dots (N-GQDs), showing controllable chemical properties. The substitutional N leads to significantly modified photoluminescence properties of the versatile N-GQDs, which also exhibit highly efficient photocurrent conversion abilities when supported by anatase nanofibers.

It shows the synthesis of nanocellulose fibers (NCFs) from biomass resources. The NCF aerogels exhibit excellent properties for water uptake, removal of dye pollutants, use as thermal insulation materials, and high sound-adsorption capability at high frequencies.

It shows the gold nanospheres with diameters precisely controlled in the range of 5–30 nm were synthesized using a successive, seed-mediated growth. The gold nanospheres were found to self-assemble into dimers, larger aggregates, and wavy nanowires when they were diluted to different volumes with deionized water.