A bioinspired photothermic MOF-spindle-knot microfiber (BPMM) is designed by using polyisopropylacrylamide, α-polyvinylidene fluorideas-grownmetal?organicframework(MOF-303),andcarbonblack.A mechanismofwaterharvestingisrelatedtotheintegrativeeffectsofchemical
and structural, i.e., BPMMcomposedof periodic-distributedMOF-spindle
knotwithroughcurvaturegradient features,displayingthethree-dimensional
skeletonwithporous channel andhigh-hydrophilic sites andphotothermal
responsivehydrophilic?hydrophobicswitchesaswell,whichrunsasynergistic
effect toachieveanultrahighwateruptake-releaseandpropelwater-molecule
captureinhighefficiencyunderatmosphericlowhumidity.BPMMtakeson～
100%ofwater releaseunder 1 sun for as-uptakedwater and, accordingly,
achieves thewaterharvestingcapabilityof～0.16?0.62gg?1h?1 at～25°C
and～10?60%relativehumidity(RH),whichoutperforms2?8timeshigher
thanthatofnormalMOF-303orotherfibers.BPMMmaintains72cyclesday?1,achievingwaterharvestingcapabilityof～12.27g
g?1 in～10%RH, under1sun.Asoutdoorat～33.4°Cwith～42.7%RHand～0.66kWm?2,BPMMreacheswaterharvesting capabilityof～24.71gg?1day?1.Thisfindingprovidesaninsight intothedesignofsupermaterials,whichwouldbeextendedinto somerealms, e.g.,waterengineering, energysystem, sensordevices insituationswithwaterscarcity, etc.