Keiichi Okajima

931 total citations
61 papers, 767 citations indexed

About

Keiichi Okajima is a scholar working on Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment and Automotive Engineering. According to data from OpenAlex, Keiichi Okajima has authored 61 papers receiving a total of 767 indexed citations (citations by other indexed papers that have themselves been cited), including 38 papers in Electrical and Electronic Engineering, 35 papers in Renewable Energy, Sustainability and the Environment and 10 papers in Automotive Engineering. Recurrent topics in Keiichi Okajima's work include Fuel Cells and Related Materials (22 papers), Electrocatalysts for Energy Conversion (16 papers) and Photovoltaic System Optimization Techniques (12 papers). Keiichi Okajima is often cited by papers focused on Fuel Cells and Related Materials (22 papers), Electrocatalysts for Energy Conversion (16 papers) and Photovoltaic System Optimization Techniques (12 papers). Keiichi Okajima collaborates with scholars based in Japan, Poland and Bulgaria. Keiichi Okajima's co-authors include Masao Sudoh, Yutaro Akimoto, Yohji Uchiyama, Yoshihiro Hishikawa, Masahiro Yoshita, Atsushi Ikeda, Koji Makino, Takafumi Ishii, Takashi Oozeki and Jun Okano and has published in prestigious journals such as SHILAP Revista de lepidopterología, Journal of Power Sources and Journal of The Electrochemical Society.

In The Last Decade

Keiichi Okajima

59 papers receiving 746 citations

Peers

Keiichi Okajima

EEE

RESE

EOMM

K. Lobato Portugal

Yiwen Yang China

Mohamedazeem M. Mohideen China

T. N. V. Krishna South Korea

Yogi Goswami United States

Lisheng Wang China

Huiming Yin China

Yingguang Zhang China

You Wang China

Juhyun Song United States

K. Lobato Portugal

Keiichi Okajima

438 ×0.9

EEE

546 ×1.6

RESE

106 ×0.5

EOMM

91 ×0.7

259 ×2.1

Citations per year, relative to Keiichi Okajima Keiichi Okajima (= 1×) peers K. Lobato

Countries citing papers authored by Keiichi Okajima

Since Specialization

Citations

This map shows the geographic impact of Keiichi Okajima's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Keiichi Okajima with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Keiichi Okajima more than expected).

Fields of papers citing papers by Keiichi Okajima

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Keiichi Okajima. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Keiichi Okajima. The network helps show where Keiichi Okajima may publish in the future.

Co-authorship network of co-authors of Keiichi Okajima

This figure shows the co-authorship network connecting the top 25 collaborators of Keiichi Okajima. A scholar is included among the top collaborators of Keiichi Okajima based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Keiichi Okajima. Keiichi Okajima is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Akimoto, Yutaro, et al.. (2025). Evaluation of lithium-ion batteries with different structures using magnetic field measurement for onboard battery identification. Green Energy and Intelligent Transportation. 4(4). 100257–100257. 1 indexed citations

Akimoto, Yutaro, et al.. (2025). Energy consumption assessment of silicate rock comminution options for enhanced weathering. Journal of Environmental Management. 393. 127073–127073.

Akimoto, Yutaro, et al.. (2025). Assessment methodology for the resilience of energy systems in positive energy buildings. e-Prime - Advances in Electrical Engineering Electronics and Energy. 11. 100908–100908.

Akimoto, Yutaro, et al.. (2024). Regional Analysis and Evaluation Method for Assessing Potential for Installation of Renewable Energy and Electric Vehicles. World Electric Vehicle Journal. 15(10). 477–477. 1 indexed citations

Akimoto, Yutaro, et al.. (2023). In-situ on-board evaluation and control of proton exchange membrane fuel cells using magnetic sensors. Applied Energy. 351. 121873–121873. 6 indexed citations

Akimoto, Yutaro, et al.. (2023). Preventive control method for stable operation of proton exchange membrane fuel-cell stacks. AIMS energy. 11(1). 64–78. 1 indexed citations

Akimoto, Yutaro, et al.. (2022). Techno-Economic Analysis of Solar Thermal Hydrogen Production in the United Arab Emirates. SHILAP Revista de lepidopterología. 3(4). 389–401. 14 indexed citations

Akimoto, Yutaro, et al.. (2021). Evaluation of Impurity Concentration Process and Mitigation Operation in Fuel Cell System for Using Biogas. SHILAP Revista de lepidopterología. 2(2). 115–128. 4 indexed citations

Hishikawa, Yoshihiro, et al.. (2021). Precise performance diagnosis of photovoltaic string by operation voltage and current: Experimental verification. Solar Energy. 230. 704–713. 1 indexed citations

10.

Hishikawa, Yoshihiro, et al.. (2020). Detection of shading effect by using the current and voltage at maximum power point of crystalline silicon PV modules. Solar Energy. 211. 1365–1372. 19 indexed citations

11.

Okajima, Keiichi, et al.. (2019). Extracting issues significant to valuing electricity from small photovoltaic systems using quantitative content analysis. The Electricity Journal. 32(10). 106673–106673. 2 indexed citations

12.

Akimoto, Yutaro, Keiichi Okajima, & Yohji Uchiyama. (2015). Evaluation of Current Distribution in a PEMFC using a Magnetic Sensor Probe. Energy Procedia. 75. 2015–2020. 5 indexed citations

13.

Mizumoto, Yuki, Yohji Uchiyama, & Keiichi Okajima. (2013). Economic and Environmental Analysis of PV Systems by Means of Hybrid Input-Output Approach. 34(5). 296. 1 indexed citations

14.

Okajima, Keiichi, et al.. (2011). Minimizing mismatch loss in BIPV system by reconnection. 2406–2411. 7 indexed citations

15.

Okajima, Keiichi, Hiroshi Ueno, & Yohji Uchiyama. (2010). Energy Chain Multi-Layered Evaluation of Advanced Thermal Power Generation Technologies in China and India. Journal of Life Cycle Assessment Japan. 6(4). 295–302. 1 indexed citations

16.

Okajima, Keiichi & Yohji Uchiyama. (2009). Life Cycle Analysis of Photovoltaic Modules with Recycling Processes. Journal of Life Cycle Assessment Japan. 5(4). 521–528. 2 indexed citations

17.

Makino, Koji, et al.. (2007). Performance of sputter-deposited platinum cathodes with Nafion and carbon loading for direct methanol fuel cells. Journal of Power Sources. 166(1). 30–34. 16 indexed citations

18.

Okajima, Keiichi, et al.. (2006). Energy and Environmental Analysis of Batteries for Electric Load Leveling Using LCA Method. Journal of Life Cycle Assessment Japan. 2(4). 379–385. 8 indexed citations

19.

Okajima, Keiichi, et al.. (2005). Degradation Evaluation of Gas-Diffusion Electrodes for Oxygen-Depolarization in Chlor-Alkali Membrane Cell. Journal of The Electrochemical Society. 152(8). D117–D117. 22 indexed citations

20.

Okajima, Keiichi, et al.. (2001). Evaluation of Metal-loaded Activated Carbon Electrode for Electrochemical Capacitor Prepared by Plasma CVD Method. Electrochemistry. 69(6). 428–430. 6 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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