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Yoshitsugu Kojima

Yoshitsugu Kojima

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 58 10435 9432 759 696 299 22950

Yoshitsugu Kojima publications per year

The chart shows the history of publications by Yoshitsugu Kojima between 1969 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Yoshitsugu Kojima published across 57 years, from 1969 to 2025, averaging 5.7 papers a year. Output peaked at 26 publications in 2017. 5 of the 327 publications appeared in the last two years.

No. of publications
5 10 15 20 25
Bar chart. Horizontal axis: year, 1969 to 2025. Vertical axis: number of publications, 0 to 26. Peak 26 publications in 2017. 1969: 4 publications 1970: 3 publications 1971: 0 publications 1972: 0 publications 1973: 0 publications 1974: 0 publications 1975: 0 publications 1976: 0 publications 1977: 0 publications 1978: 0 publications 1979: 1 publication 1980: 0 publications 1981: 0 publications 1982: 0 publications 1983: 1 publication 1984: 1 publication 1985: 1 publication 1986: 1 publication 1987: 0 publications 1988: 9 publications 1989: 1 publication 1990: 2 publications 1991: 1 publication 1992: 1 publication 1993: 10 publications 1994: 7 publications 1995: 9 publications 1996: 3 publications 1997: 11 publications 1998: 6 publications 1999: 4 publications 2000: 3 publications 2001: 7 publications 2002: 10 publications 2003: 3 publications 2004: 13 publications 2005: 7 publications 2006: 10 publications 2007: 10 publications 2008: 7 publications 2009: 12 publications 2010: 15 publications 2011: 19 publications 2012: 9 publications 2013: 22 publications 2014: 9 publications 2015: 13 publications 2016: 7 publications 2017: 26 publications 2018: 8 publications 2019: 7 publications 2020: 10 publications 2021: 10 publications 2022: 7 publications 2023: 2 publications 2024: 2 publications 2025: 3 publications
1969 2025

327 publications in total across all disciplines

View publications per year as a table
Yoshitsugu Kojima: publications per year, 1969 to 2025
Year Publications
1969 4
1970 3
1971 0
1972 0
1973 0
1974 0
1975 0
1976 0
1977 0
1978 0
1979 1
1980 0
1981 0
1982 0
1983 1
1984 1
1985 1
1986 1
1987 0
1988 9
1989 1
1990 2
1991 1
1992 1
1993 10
1994 7
1995 9
1996 3
1997 11
1998 6
1999 4
2000 3
2001 7
2002 10
2003 3
2004 13
2005 7
2006 10
2007 10
2008 7
2009 12
2010 15
2011 19
2012 9
2013 22
2014 9
2015 13
2016 7
2017 26
2018 8
2019 7
2020 10
2021 10
2022 7
2023 2
2024 2
2025 3
Total 327
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Yoshitsugu Kojima publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Yoshitsugu Kojima sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 281–300 publications, is where this scientist sits. 61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61–80 publications 1,295+

This scientist: 299 publications — 63rd percentile

63% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
261–280 979
281–300 939 299
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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Yoshitsugu Kojima D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Yoshitsugu Kojima sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 58–59 D-Index, is where this scientist sits. 40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40–41 D-Index 159+

This scientist: 58 D-Index — 42nd percentile

42% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933
56–57 1,051
58–59 930 58
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

Yoshitsugu Kojima is affiliated with Hiroshima University in Japan and has established a body of research primarily focused on hydrogen storage and ammonia-related energy carriers. Their work spans various interconnected fields within materials science and chemical engineering.

The research contributions include significant publications in the areas of hydrogen storage materials and ammonia synthesis, emphasizing catalytic processes and chemical characterization. Kojima's expertise lies notably in materials chemistry and catalysis, as well as industrial and manufacturing engineering and atomic and molecular physics.

Frequent publication venues for their work include:

  • International Journal of Hydrogen Energy
  • Chemical Communications
  • Energies
  • ACS Omega
  • RSC Advances

Important research topics covered by Kojima's publications are:

  • Hydrogen Storage and Materials
  • Ammonia Synthesis and Nitrogen Reduction
  • Catalytic Processes in Materials Science
  • Chemical Synthesis and Characterization
  • Hybrid Renewable Energy Systems
  • Advanced Chemical Physics Studies
  • Chemical Looping and Thermochemical Processes

Collaborations have been an integral part of Kojima's research endeavors. Frequent coauthors include Masakuni Yamaguchi, Hiroki Miyaoka, Takayuki Ichikawa, Tomoyuki Ichikawa, and Fangqin Guo.

Notable recent publications by Yoshitsugu Kojima comprise:

  • "Ammonia as a hydrogen energy carrier," 2022, International Journal of Hydrogen Energy
  • "Safety of ammonia as a hydrogen energy carrier," 2023, International Journal of Hydrogen Energy
  • "Ammonia storage materials for nitrogen recycling hydrogen and energy carriers," 2020, International Journal of Hydrogen Energy
  • "Investigation on standard entropy change of metal hydrides and work function of metals," 2020, International Journal of Hydrogen Energy

These works reflect a focus on the development of materials and processes relevant to ammonia's role in hydrogen energy systems and nitrogen recycling.

The main fields of study for Kojima are:

  • Materials Science
  • Chemical Engineering

Within these larger fields, their subfields of specialization include:

  • Materials Chemistry
  • Catalysis
  • Industrial and Manufacturing Engineering
  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology

Best Publications

  • Synthesis of nylon 6-clay hybrid

    Arimitsu Usuki;Yoshitsugu Kojima;Masaya Kawasumi;Akane Okada

  • Mechanical properties of nylon 6-clay hybrid

    Yoshitsugu Kojima;Arimitsu Usuki;Masaya Kawasumi;Akane Okada

  • Swelling behavior of montmorillonite cation exchanged for ω-amino acids by ∊-caprolactam

    Arimitsu Usuki;Masaya Kawasumi;Yoshitsugu Kojima;Akane Okada

  • Synthesis of nylon 6-clay hybrid by montmorillonite intercalated with ε-caprolactam

    Yoshitsugu Kojima;Arimitsu Usuki;Masaya Kawasumi;Akane Okada

  • Materials for hydrogen-based energy storage – past, recent progress and future outlook

    Michael Hirscher;Volodymyr A. Yartys;Marcello Baricco;Jose Bellosta von Colbe

  • Hydrogen generation using sodium borohydride solution and metal catalyst coated on metal oxide

    Yoshitsugu Kojima;Ken-ichirou Suzuki;Kazuhiro Fukumoto;Megumi Sasaki

  • One‐pot synthesis of nylon 6–clay hybrid

    Yoshitsugu Kojima;Arimitsu Usuki;Masaya Kawasumi;Akane Okada

  • Sorption of water in nylon 6-clay hybrid

    Yoshitsugu Kojima;Arimitsu Usuki;Masaya Kawasumi;Akane Okada

  • Interaction of nylon 6‐clay surface and mechanical properties of nylon 6‐clay hybrid

    Arimitsu Usuki;Akihiko Koiwai;Yoshitsugu Kojima;Masaya Kawasumi

  • Hydrogen storage materials for hydrogen and energy carriers

    Yoshitsugu Kojima

  • Nylon 6–Clay Hybrid

    Akane Okada;Masaya Kawasumi;Arimitsu Usuki;Yoshitsugu Kojima

  • Gas permeabilities in rubber-clay hybrid

    Y. Kojima;K. Fukumori;A. Usuki;A. Okada

  • Recycling process of sodium metaborate to sodium borohydride

    Yoshitsugu Kojima;Tetsuya Haga

  • Fine structure of nylon-6 : clay hybrid

    Yoshitsugu Kojima;Arimitsu Usuki;Masaya Kawasumi;Akane Okada

  • Verfahren zur herstellung eines verbundmaterials

    Masaya Kawasumi;Masao Kohzaki;Yoshitsugu Kojima;Akane Okada

  • Reversible ammonia-based and liquid organic hydrogen carriers for high-density hydrogen storage: Recent progress

    Joshua W. Makepeace;Teng He;Claudia Weidenthaler;Torben R. Jensen

  • Development of vanadium based hydrogen storage material: A review

    Sanjay Kumar;Sanjay Kumar;Ankur Jain;T. Ichikawa;Y. Kojima

  • Development of 10 kW-scale hydrogen generator using chemical hydride

    Yoshitsugu Kojima;Ken-ichirou Suzuki;Kazuhiro Fukumoto;Yasuaki Kawai

  • Novel preferred orientation in injection‐molded nylon 6‐clay hybrid

    Yoshitsugu Kojima;Arimitsu Usuki;Masaya Kawasumi;Akane Okada

  • Compressed hydrogen generation using chemical hydride

    Yoshitsugu Kojima;Yasuaki Kawai;Haruyuki Nakanishi;Shinichi Matsumoto

  • IR characterizations of lithium imide and amide

    Yoshitsugu Kojima;Yasuaki Kawai

Frequent Co-Authors

Takayuki Ichikawa
Takayuki Ichikawa Hiroshima University
Akane Okada
Akane Okada Toyota Motor Corporation (Japan)
Arimitsu Usuki
Arimitsu Usuki Toyota Motor Corporation (Japan)
Hironobu Fujii
Hironobu Fujii Hiroshima University
Bjørn C. Hauback
Bjørn C. Hauback University of Oslo
William I. F. David
William I. F. David University of Oxford
Shin-ichi Orimo
Shin-ichi Orimo Tohoku University
Yoshiaki Fukushima
Yoshiaki Fukushima Advanced Institute of Materials Science
Yuko Nakamori
Yuko Nakamori Tohoku University
Emilio Artacho
Emilio Artacho University of Cambridge

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