biostudies-literatureLv SNSFCNatural Science Foundation of Shandong ProvinceNational Natural Science Foundation of ChinaShenzhen Science and Technology ProgramMajor Basic and Applied Basic Research Projects of Guangdong ProvinceNatural Science Foundation of Jiangsu Provincee2300780https://www.ebi.ac.uk/biostudies/studies/S-EPMC10214239biostudies-literatureUnknown10(15)Gallium nitride (GaN) single crystal, as the representative of wide-band semiconductors, has great prospects for high-temperature energy storage, of its splendid power output, robust temperature stability, and superior carrier mobility. Nonetheless, it is an essential challenge for GaN-based devices to improve energy storage. Herein, an innovative strategy is proposed by constructing GaN/Nickel cobalt oxygen (NiCoO₂  ）heterostructure for enhanced supercapacitors (SCs). Benefiting from the synergy effect between the porous GaN network as a highly conductive skeleton and the NiCoO₂ with massive active sites. The GaN/NiCoO₂ heterostructure-based SCs with ion liquids electrolyte are assembled and delivered an impressive energy density of 15.2 µWh cm<sup>-2</supAdvanced science (Weinheim, Baden-Wurttemberg, Germany)Gallium Nitride Based Electrode for High-Temperature Supercapacitors.PMC10214239ZR2021MB034BK20210115JCYJ202103241416070192021A151511055952002226ZR2020QE06452202265Liang CWang SLv SWang GZhong YZhang LYu JXu XLi LXie SfalseGallium Nitride Based Electrode for High-Temperature Supercapacitors.Gallium nitride (GaN) single crystal, as the representative of wide-band semiconductors, has great prospects for high-temperature energy storage, of its splendid power output, robust temperature stability, and superior carrier mobility. Nonetheless, it is an essential challenge for GaN-based devices to improve energy storage. Herein, an innovative strategy is proposed by constructing GaN/Nickel cobalt oxygen (NiCoO₂  ）heterostructure for enhanced supercapacitors (SCs). Benefiting from the synergy effect between the porous GaN network as a highly conductive skeleton and the NiCoO₂ with massive active sites. The GaN/NiCoO₂ heterostructure-based SCs with ion liquids electrolyte are assembled and delivered an impressive energy density of 15.2 µWh cm<sup>-2</sup2023-01-01T00:00:00Z2023 May2025-04-22T12:03:40.758Z2025-04-06T00:09:20.207ZS-EPMC102142393696508110.1002/advs.202300780