Preface

Abstract

2021 The 4th International Symposium on Hydrogen Energy and Energy Technologies (HEET 2021) 19–20 November 2021, Osaka, Japan (virtual conference (ZOOM)) We are glad to introduce you that the 2021 The 4th International Symposium on Hydrogen Energy and Energy Technologies (HEET 2021) was successfully held on November 19-20,2021. In light of worldwide travel restriction and the impact of COVID-19, HEET 2021 was carried out in the form of virtual conference (ZOOM) to avoid personnel gatherings.The vision of the HEET 2021 is a premier interdisciplinary platform for researchers, practitioners and educators to present and discuss the most recent innovations, trends, and concerns as well as practical challenges encountered and solutions adopted in the fields of Hydrogen Energy & Energy Technologies.During the conference, the conference model was divided into four sessions, including oral presentations, keynote speeches, poster presentation and online Q&A discussion. We have 8 keynote speeches, 1 invited talk, 21 oral presentation and 6 poster presentations both from local and international presenters. The international presenters come from 14 countries and regions namely Iran, Japan, China, France, Slovenia, U.K, Russia, Singapore, Argentina, USA, Chile, Turkey, India, Taiwan. The time spent delivering the talks by each keynote speaker was 30 minutes, the oral presentation speaker was 15 minutes following by a Question Answer (Q & A) Session 5 minutes for each.We are thankful to all the authors who submitted papers and the delegates for their participation and their interest in HEET as a platform to share their ideas and innovation.Also, we are also thankful to all the committee members for providing continuous guidance and support and Efforts taken by peer reviewers contributed to improve the quality of papers provided constructive critical comments, improvements and corrections to the authors are gratefully appreciated for their contribution to the success of the conference.List of Technical Program Committees are available in this pdf.