Efficient hydrogen production by water electrolysis is significant for the development of renewable energy. To date, the cost and scarcity of noble‐metal catalysts are limiting their scale‐up applications. To overcome the current challenge, high‐performance novel electrocatalysts are required to speed up the commercialization of electrolysis technology. Notably, the sluggish electrode reactions, namely, the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), especially the latter, have been the main rate‐limiting factor for water splitting. Phosphate, as a new series of OER electrocatalysts, has attracted enormous attentions, owing to its unique lattice structure geometry. The phosphate group not only benefits the adsorption of water molecule but also facilitates the oxyhydrate of metal site and dissociation of water. This Minireview provides a brief summary of the recent progresses of phosphate‐based electrocatalysts, discusses the relationship between crystal structure and catalytic activity, and presents the challenges of phosphate electrocatalysts.

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Conductive hydrogel have attracted widespread attention in wearable electronic devices and human motion detection. However, designing self-healing hydrogel with high conductivity and excellent mechanical properties remains a challenge. In this...

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Flexible piezoresistive sensors with high sensitivity, low cost, and wide response ranges are urgently required due to the rapid development of wearable electronics. Here, carbon nanotubes (CNTs)/graphene/waterborne polyurethane (WPU)/cellulose nanocrystal (CNC) composite aerogels (CNTs/graphene/WC) were fabricated by facile solution mixing and freeze-drying technology for high-performance pressure sensors. WPU and CNC were constructed as a 3D structure skeleton, and the synergistic effect of CNTs and graphene was beneficial to enhancing the sensing performance. The obtained pressure sensor exhibits a highly porous network structure, remarkable mechanical properties (76.16 kPa), high sensitivity (0.25 kPa–1), an ultralow detection limit (0.112 kPa), and high stability (>800 cycles). More importantly, the piezoresistive sensor could be successfully used to detect various human motions such as finger bending, squatting–rising, walking, and running and effectively extract real-time information by the electrical signals. In addition, the CNTs/graphene/WC composite aerogel exhibits excellent thermal insulation performance, which can withstand 160 °C for a long time without any damage to the structure. The CNTs/graphene/WC composite aerogel, because of its thermal insulation property, endows the sensor with the potential for application in high-temperature environments. The results indicate that CNTs/graphene/WC composite aerogels possess high sensing performance and outstanding thermal insulation, which means that the aerogels could be used as flexible, wearable electronics.