diminishing groundwater resources, mitigated river flows, dwindling lakes, and heavily polluted water. The challenge of providing sufficient and safe freshwater is limited by population growth, climatic changes, industrialization, and contamination of available freshwater sources. [1][2][3][4][5][6] In its latest annual risk report, the world economic forum ranks water crisis as a major global risk in terms of its potential impact. Many problems associated with the scarcity of water not only are restricted to around four billion people lacking access to safe and pure drinking water at least one month of the year, [3,7] high mortality rates, instigation of civil or international conflicts [8,9] but also pose a severe threat to industries, affecting operations and supply chain. [2] The most common reason attributed to this is that only about 3% of the earth's water resources is fresh and the rest is saline and unpalatable. Of the fresh water sources, 2.5% is locked up in the form of glaciers in the Arctic and Antarctic regions and are unavailable for use. Thus humanity, for its sustenance, must rely only on the 0.5% of the total water resources which is stored as underground aquifers, flowing rivers, natural lakes, and manmade storage facilities.Several alternative approaches of water harvesting have been developed lately. These include water harvesting from ambient humid atmospheres using hydrophobic surfaces for easy water condensation, [10] purification of water accompanying the production of shale gas, [11] water harvesting from fog [12,13] using special structures, dewing, [14,15] disinfection and decontamination of polluted water sources, [7,16,17] and desalination of seawater. Inspired by the unique water harvesting abilities of cacti [18] and some of the beetles of the Namib desert, [19] synthesis of biomimetic structures using copper [20,21] and branched ZnO nanowires [18] have been employed for water collection. Fog collectors, employing the principle of forcing fog droplets through a mesh for water collection have been employed recently in many African and European countries to harvest fresh water from moving clouds. [13] However these alternative sources contribute only to a very small fraction of the actual demand for fresh water, which widely varies demographically and totals to a staggering value of ten billion tons per day. [22] Water scarcity is a ubiquitous problem with its magnitude expected to rise in the near future, and efforts to seek alternative water sources are on the rise. Harvesting water from air has intrigued enormous research interest among many groups with Scientific American listing this technology as the second most impactful technology that can bring about a massive change in people's lives. Though desalination offers a huge prospect in mitigating water crisis, its practicality is limited by exorbitant energy requirement. Alternatively, the air above sea water is moisture rich, with the quantity of vapor increasing at the rate of 0.41 kg m −2 . Herein, a method to sustainably h...