Professor Ren is mainly working on wireless sensing, wearable sensors for asthma sensing, piezoelectric blood viscosity sensors, MEMS microbial fuel cells and supercapacitors, oxide based electronics, micromirrors, DC-DC boost converters, etc.

He published more than 30 peer-reviewed journal papers in Nano Energy, Biosensors and Bioelectronics, Journal of Power Sources, Nanoscale, IEEE Transactions on Electron Devices, IEEE Transactions on Power Electronics, Environmental Science and Technology, ChemSusChem, Scientific Reports, Applied Physics Letters, International Journal of Hydrogen Energy, Microfluidics and Nanofluidics, Journal of Micromechanics and Microengineering, etc. Of them, 16 papers are first authored or corresponding authored, one first-authored journal paper has an impact factor >17 and four first-authored journal paper has an impact factor >7.7. He also published 6 first-authored conference papers in top international conference in MEMS area (4 IEEE MEMS and 2 IEEE Solid-State Sensors and Actuators Workshop). He is the recipient of the Best Poster Award Finalist in IEEE MEMS 2013. He also published 5 first-authored book chapters in Wiley-VCH, Elsevier, CRC Press, Springer. He is a reviewer for journals including Advanced Energy Materials, Nano Energy, Biosensors Bioelectronics, Small, Nanoscale, IEEE Journal of Emerging and Selected Topics on Power Electronics, ACS Applied Materials and Interfaces, Sensors and Actuators, ChemSusChem.

He achieved a world record current and power density in all microbial fuel cells since 2014 (among more than 3000 journal papers). In 2016 he further improved the world record current and power density by 3 fold. During the same period, he presented the first microbial supercapacitor in the world and improved the current and power density by one order of magnitude.

He published more than 30 peer-reviewed journal papers in Nano Energy, Biosensors and Bioelectronics, Journal of Power Sources, Nanoscale, IEEE Transactions on Electron Devices, IEEE Transactions on Power Electronics, Environmental Science and Technology, ChemSusChem, Scientific Reports, Applied Physics Letters, International Journal of Hydrogen Energy, Microfluidics and Nanofluidics, Journal of Micromechanics and Microengineering, etc. Of them, 16 papers are first authored or corresponding authored, one first-authored journal paper has an impact factor >17 and four first-authored journal paper has an impact factor >7.7. He also published 6 first-authored conference papers in top international conference in MEMS area (4 IEEE MEMS and 2 IEEE Solid-State Sensors and Actuators Workshop). He is the recipient of the Best Poster Award Finalist in IEEE MEMS 2013. He also published 5 first-authored book chapters in Wiley-VCH, Elsevier, CRC Press, Springer. He is a reviewer for journals including Advanced Energy Materials, Nano Energy, Biosensors Bioelectronics, Small, Nanoscale, IEEE Journal of Emerging and Selected Topics on Power Electronics, ACS Applied Materials and Interfaces, Sensors and Actuators, ChemSusChem.

He achieved a world record current and power density in all microbial fuel cells since 2014 (among more than 3000 journal papers). In 2016 he further improved the world record current and power density by 3 fold. During the same period, he presented the first microbial supercapacitor in the world and improved the current and power density by one order of magnitude.