Quasi-solid-state Zn-air batteries with an atomically dispersed cobalt electrocatalyst and organohydrogel electrolyte

Abstract

Quasi-solid-state Zn-air batteries are usually limited to relatively low-rate ability (<10 mA cm−2), which is caused in part by sluggish oxygen electrocatalysis and unstable electrochemical interfaces. Here we present a high-rate and robust quasi-solid-state Zn-air battery enabled by atomically dispersed cobalt sites anchored on wrinkled nitrogen doped graphene as the air cathode and a polyacrylamide organohydrogel electrolyte with its hydrogen-bond network modified by the addition of dimethyl sulfoxide. This design enables a cycling current density of 100 mA cm−2 over 50 h at 25 °C. A low-temperature cycling stability of over 300 h (at 0.5 mA cm−2) with over 90% capacity retention at −60 °C and a broad temperature adaptability (−60 to 60 °C) are also demonstrated.

Understanding the Catalytic Kinetics of Polysulfide Redox Reactions on Transition Metal Compounds in Li–S Batteries

“…However, study on solid-state Li–S batteries is in its infancy, and challenges such as low ionic conductivity and high interfacial resistance need to be solved. Further consideration should be given to design high-performance catalysts and diversified battery configurations to endow the all solid-state batteries with good safety (crush and puncture tolerance) and environmental suitability (ultrahigh/low temperature resistance). , …”

Low-temperature resistant gel polymer electrolytes for zinc–air batteries

“…2. [15][16][17][18][19][20][21][22][23][24][25] Since the emergence of ZABs, batteries have been continuously developed towards exibility and low-temperature resistance. ZABs consist of a zinc anode, electrolyte and a porous air electrode with catalysts (Fig.…”

“…Besides, several studies have demonstrated that the introduction of organic solvents into electrolytes could inhibit the passivation of Zn surfaces and promote uniform Zn dissolution/deposition. [80][81][82] Inspired by these, we 25 introduced DMSO into PAM and obtained the low-temperature resistant PAM organohydrogel electrolyte. As shown in the inset of Fig.…”

Tuning the Electronic Structure of Cobalt–Ruthenium Phosphide Nanosheets for Efficient Overall Water Splitting

“…Hydrogen energy is crucial for the chemical production industry and energy structure transition. Electrocatalytic splitting of water is an economical, sustainable, environmentally friendly approach for hydrogen generation. , However, both hydrogen and oxygen evolution reactions (HER and OER) involved in the overall water splitting suffer from the high overpotential caused by the sluggish kinetics. , Due to the appropriate strength of the Pt–H bond facilitating the hydrogen adsorption and desorption processes, Pt and Pt-based materials deliver the highest activity in HER. , Regrettably, the high price and low enrichment in the earth’s crust greatly restrict its large-scale industrial application. At present, nonprecious transition-metal-based catalysts have been widely researched, such as transition metal oxide, , hydroxides, carbide, selenides, , sulfides, and nitrides .…”