Plasma-activated Co3(PO4)2 nanosheet arrays with Co3+-Rich surfaces for overall water splitting

Plasma-activated Co3(PO4)2 nanosheet arrays are developed as a highly active bifunctional catalyst for HER and OER in alkaline solutions with overpotentials of 50 and 240 mV, respectively, to reach 10 mA cm−2, which are among the best reported for precious-metal-free electrocatalysts. The superior electrocatalytic performance corresponds to the large active surface area and the high content of Co3+.267