Water Splitting Exceeding 17% Solar-to-Hydrogen Conversion Efficiency Using Solution-Processed Ni-Based Electrocatalysts and Perovskite/Si Tandem Solar Cell

• DOI: 10.1021/acsami.9b09344
• Publication Date: 2019-08-22T15:55:58Z
• Authors: Hoonkee Park; Ik Jae Park; Mi Gyoung Lee; Ki Chang Kwon; Seung-Pyo Hong; Do Hong Kim; Sol A Lee; Tae Hyung Lee; Changyeon Kim; Cheon Woo Moon; Dae-Yong Son; Gwan Ho Jung; Hong Seok Yang; Jea Ryung Lee; Jinwoo Lee; Nam-Gyu Park; Soo Young Kim; Jin Young Kim; Ho Won Jang
• Keywords: Tandem; Perovskite solar cell

Various noble metal-free electrocatalysts have been explored to enhance the overall water splitting efficiency. Ni-based compounds attracted substantial attention for achieving efficient oxygen evolution reaction (OER) and hydrogen (HER) catalysts. Here, we show superior based on NiFe alloy electroformed by a roll-to-roll process. (oxy)hydroxide synthesized an anodization method OER catalyst shows overpotential of 250 mV at 10 mA cm–2, which is dramatically smaller than that bare with 380 cm–2. Electrodeposited NiMo films HER also exhibit small 100 cm–2 compared (550 cm–2). A combined spectroscopic electrochemical analysis reveals clear relationship between surface chemistry properties. These outstanding fully solution-processed catalysts facilitate superb properties due enlarged active surfaces highly catalytic We monolithic perovskite/Si tandem solar cell MAPb(I0.85Br0.15)3 direct conversion energy into energy, leading high solar-to-hydrogen efficiency 17.52%. Based cost-effective solution processes, our photovoltaic–electrocatalysis (PV-EC) system has advantages over latest high-performance systems.