Construction of a Nanocomposite Based on Rice Husk on Nickel Foam Substrate for Efficient Water Splitting in Alkaline Medium

Water splitting is a highly encouraging strategy for the sustainable generation of hydrogen as a clean energy carrier. However, conventional electrocatalysts exhibit high overpotentials and low efficiencies, significantly limiting their practical applicability. To address these challenges, the development of advanced electrocatalytic materials is essential for achieving efficient and cost‐effective hydrogen evolution. Herein, we report carbon‐based nanocomposites derived from rice husk and cesium tungstophosphoric acid (CTP) as the electrocatalyst. In this work, rice husk biochar‐cesium tungstophosphoric acid nanopowder‐chitosan on nickel foam substrate (abbreviated as RHB‐CTP‐CS/NF) was used as an efficient water‐splitting electrocatalyst. The overpotentials of RHB‐CTP‐CS/NF for the hydrogen and oxygen evolution reactions (HER and OER, respectively) are 96.5 and 117.8 mV at 10 mA cm −2 , respectively. To reach 10 mA cm −2 current density during the overall water‐splitting process, the RHB‐CTP‐CS/NF cell voltage is 1.60 V. In addition, the prepared electrocatalysts demonstrated excellent stability during 2000 cycles of CV.