Ternary　carbonate　nanofluids　have　proven　to　be　a　promising　high　temperature　thermal　energy　storage　and　transfer　medium　for　solar　thermal　power.　For　the　ternary　carbonate　K2CO3　Li2CO3　Na2CO3　(4　:　4　:　2,　mass　ratio)　with　SiO2　nanoparticles　prepared　using　a　two　step　solution　method,　the　enhancement　of　the　specific　heat　capacity　was　up　to　113.7%　at　540　degrees　C　compared　to　the　ternary　carbonate　prepared　by　a　direct　mixing　method.　The　present　work　aims　to　give　insights　into　the　marked　enhancement　of　specific　heat　capacity.　The　effect　of　evaporation　temperature　on　the　nanostructures　formed　in　ternary　carbonate　nanofluids　is　discussed　for　the　enhancement　of　specific　heat　capacity.　More　importantly,　based　on　an　analysis　of　inductively　coupled　plasma　atomic　emission　spectrometry,　it　is　revealed　that　the　composition　ratio　of　the　ternary　carbonate,　which　can　influence　its　specific　heat　capacity,　was　changed　during　the　evaporation　process　in　an　electrothermal　drier.　Besides　a　difference　in　the　solubility　of　the　carbonates　in　water,　it　is　demonstrated　that　the　heating　mode　can　affect　the　composition　ratio　of　mixed　molten　salts.