ZI Yunlong 訾雲龍
Assistant Professor
TEL: 852 - 3943 3093

Dr. Yunlong Zi received his B.Eng. degree from the Department of Materials Science and Engineering at Tsinghua University in 2009. He received his Ph.D. degree from the Department of Physics and Astronomy at Purdue University in 2014. After his graduate study, he worked as a Postdoctoral Fellow in the School of Materials Science and Engineering at Georgia Institute of Technology. Dr. Zi joined the Department of Mechanical and Automation Engineering at the Chinese University of Hong Kong as an Assistant Professor in November, 2017. He served as session chairs for Materials Research Society 2017 Spring Meeting. His current research interests include mechanical energy harvesting, high-voltage applications of triboelectric nanogenerators, self-powered system, novel energy harvesting technologies.

Research Interests
  • Triboelectric Nanogenerators
  • Charging and Discharging Effects of Triboelectric Charges
  • Self-powered Systems
Current Projects
  • Multi-Scale Studies of the In-Situ Discharge Behaviors in Triboelectric Nanogenerators, Role: PI, General Research Fund, HK$839,640, 01/2021-12/2023
  • Boosting Dynamic Performance of the Triboelectric Nanogenerator, Role: PI, Early Career Scheme, Research Grant Council, HK$461,565, 09/2019-08/2022
  • High-Performance Triboelectric Nanogenerators for Vibration Energy Harvesting, Role: PI, Innovation & Technology Support Program Tier 3, Innovation & Technology Fund, HK$1,382,495.50, 01/2019-06/2020
  • Development of High-Performance Triboelectric Nanogenerators for Renewable Blue Energy Harvesting, Role: PI, Shun Hing Institute of Advanced Engineering, HK$756,000, 07/2018-06/2020
  • Self-Powered Wireless Sensor for Automatic Equipment, Role: PI, Tencent Technology (Shenzhen) Co. Ltd University Collaboration Program, HK$450,000, 07/2020-06/2021
Teaching by Years
MAEG3010 Mechanics of Materials
EEEN4010 Kinetic Energy Harvesting Devices and Systems
ENGG1310 Engineering Physics: Electromagnetics, Optics and Modern Physics
EEEN4010 Kinetic Energy Harvesting Devices and Systems
ENGG1310 Engineering Physics: Electromagnetics, Optics and Modern Physics
EEEN4010 Kinetic Energy Harvesting Devices and Systems
UGEB1307 Energy and Green Society
MAEG3100 Energy Systems

Journal Papers (in the recent five years)

  1. J. Wang, C. Meng, Q. Gu, M.C. Tseng, S.T. Tang, H.S. Kwok, J. Cheng, Y. Zi #, Normally Transparent Tribo-Induced Smart Window, ACS Nano, 14 (3), 3630-3639 (2020)
  2. X. Xia, J. Fu, Y. Zi #, A Universal Standardized Method for Output Capability Assessment of Nanogenerators, Nature Communications, 10:4428 (2019)
  3. J. Fu, X. Xia, G. Xu, X. Li, Y. Zi #, On the Maximal Output Energy Density of Nanogenerators, ACS Nano, 13 (11), 13257-13263 (2019)
  4. J. Wang, H. Wang, X. Li, Y. Zi #, Self-Powered Electrowetting Optical Switch Driven by a Triboelectric Nanogenerator for Wireless Sensing, Nano Energy, 66, 104140 (2019)
  5. G. Xu, X. Li, X. Xia, J. Fu, W. Ding, Y. Zi#, On the Force and the Energy Conversion in Triboelectric Nanogenerators, Nano Energy, 59, 154-161 (2019)
  6. A. Li*, Y. Zi*, H. Guo, Z.L. Wang, F.M. Fernández, Triboelectric Nanogenerators for Sensitive Nano-Coulomb Molecular Mass Spectrometry, Nature Nanotechnology, 12 (5), 481-487 (2017) (*equal-author contributors)
  7. Triboelectric Nanogenerators (Book), by Z.L. Wang, L. Lin, J. Chen, S. Niu, Y. Zi, Springer, 2016, ISBN 3319400398, 9783319400396
  8. Y. Zi, J. Wang, S. Wang, S. Li, Z. Wen, H. Guo, Z.L. Wang, Effective Energy Storage from a Triboelectric Nanogenerator, Nature Communications, 7:10987, (2016)
  9. Y. Zi, S. Niu, J. Wang, Z. Wen, W. Tang, Z.L. Wang, Standards and Figure-of-Merits for Quantifying the Performance of Triboelectric Nanogenerators, Nature Communications, 6:8376, (2015)
  10. Y. Zi, L. Lin, J. Wang, S. Wang, J. Chen, X. Fan, P.K. Yang, F. Yi, Z.L. Wang, Triboelectric-Pyroelectric-Piezoelectric Hybrid Cell for High-Efficient Energy-Harvesting and Self-Powered Sensing, Advanced Materials, 27, 2340-2347 (2015)

Honours and Awards

  1. Croucher Innovation Award Nomination (2019) – among only 3 candidates nominated by CUHK.
  2. Emerging Investigator, Journal of Materials Chemistry C (2018)
  3. Young Scientist Award Finalist, Microsystems & Nanoengineering Summit (2018)
  4. Materials Research Society (MRS) Postdoctoral Award (2017) – the first winner from Georgia Tech.
  5. One of “5 students who are Transformation Makers” of Purdue University (2013) – Highlighted in Purdue homepage (04/25/2013) and banners at campus. (05/2013-09/2015)


  1. Triboelectric Nanogenerators, by Z.L. Wang, L. Lin, J. Chen, S. Niu, Y. Zi, Springer, 2016, ISBN 3319400398, 9783319400396.