Graphdiyne Oxide-Enabled Solid-State Proton Battery Exhibiting Superior Rate Capability

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Proton batteries offer high safety, power density, and stability for energy storage.
• Developing solid-state electrolytes with high proton conductivity is a key challenge.

Purpose of the Study:

• To introduce graphdiyne oxide (GDYO) as a novel solid-state electrolyte for proton batteries.
• To enhance proton conductivity in solid-state electrolytes using a GDYO and phosphoric acid composite.

Main Methods:

• Fabrication of a graphdiyne oxide and phosphoric acid composite (GDYO@H3PO4).
• Characterization using Fourier-transform infrared (FTIR) and solid-state fluorescence spectroscopy.
• Assembly and testing of a hydrous vanadium hexacyanoferrate//MoO3 (VHCF//MoO3) full solid-state proton battery.

Main Results:

• The GDYO@H3PO4 electrolyte exhibits an interconnected hydrogen bonding network, facilitating proton transport.
• The assembled proton battery shows excellent rate capability, retaining 53.6% capacity at 50C.
• Remarkable cycling stability was achieved: 102.2 mAh g⁻¹ capacity with 90.2% retention after 4500 cycles.

Conclusions:

• GDYO@H3PO4 is a promising solid-state electrolyte for high-performance proton batteries.
• This approach offers a new strategy for developing stable and efficient solid-state batteries.
• GDYO shows potential as a platform for designing advanced electrocatalysts in solid-state batteries.