Synthesis of porous LaNiO₃ thin films by chemical solution deposition for enhanced oxygen evolution reaction

Herein, a facile chemical solution deposition (CSD) strategy is adopted to synthesize LaNiO₃ (LNO) thin films with an obvious porous structure (P-LNO). It is demonstrated that the porous structure can greatly promote the OER performance of LNO, requiring an overpotential of 367 mV to achieve 10 mA cm^-2, which is much lower than that of a normal LNO thin film (478 mV). As revealed by the following experimental results, the presence of the porous structure offers more exposed active sites and promotes electron transfer between catalysts and electrolyte, giving rise to an enhanced OER performance of the P-LNO film.