Direct solar-driven electrochemical dissociation of H2S to H2 with 12 % solar-to-hydrogen conversion efficiency in diaphragm electrolytic reactor

Solar-driven electrochemical dissociation of hydrogen sulfide (H 2 S) to hydrogen and sulfur products in photovoltaic-electrochemical (PV-EC) devices becomes an effective strategy for acid gas purification and energy-saving hydrogen production . However, available H 2 S splitting electrochemical devices suffer from inferior energy conversion efficiency and fussy multi-step sulfur recovery problems. Herein, we propose an integrated solar-driven PV-EC system with diaphragm electrolytic reactor to solve these challenges. The optimized system integrated commercial silicon solar delivers a high solar-to-hydrogen energy conversion efficiency of up to 12 %, with approximately 99 % H 2 faradaic efficiency and demonstrates at least 50 hours of stability. More importantly, the S 2- /HS - can be transformed into add-valued Na 2 S 2 O 3 by one-step method in Na 2 SO 3 media, which avoids complex sulfur recovery. This work presents an alternative method of low-energy consumption for producing H 2 and high-value sulfur-related chemicals by H 2 S splitting through a PV-EC system.