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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 62 8902 8077 619 575 247 12631

Ken-ichi Aika publications per year

The chart shows the history of publications by Ken-ichi Aika between 1968 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ken-ichi Aika published across 58 years, from 1968 to 2025, averaging 4.4 papers a year. Output peaked at 20 publications in 2001. 2 of the 255 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1968 to 2025. Vertical axis: number of publications, 0 to 20. Peak 20 publications in 2001. 1968: 1 publication 1969: 2 publications 1970: 2 publications 1971: 3 publications 1972: 2 publications 1973: 0 publications 1974: 2 publications 1975: 4 publications 1976: 2 publications 1977: 2 publications 1978: 1 publication 1979: 1 publication 1980: 0 publications 1981: 2 publications 1982: 3 publications 1983: 4 publications 1984: 6 publications 1985: 5 publications 1986: 10 publications 1987: 2 publications 1988: 9 publications 1989: 3 publications 1990: 7 publications 1991: 6 publications 1992: 9 publications 1993: 3 publications 1994: 5 publications 1995: 7 publications 1996: 9 publications 1997: 4 publications 1998: 12 publications 1999: 8 publications 2000: 11 publications 2001: 20 publications 2002: 16 publications 2003: 15 publications 2004: 18 publications 2005: 12 publications 2006: 7 publications 2007: 4 publications 2008: 1 publication 2009: 3 publications 2010: 2 publications 2011: 0 publications 2012: 0 publications 2013: 0 publications 2014: 0 publications 2015: 0 publications 2016: 0 publications 2017: 1 publication 2018: 1 publication 2019: 0 publications 2020: 0 publications 2021: 0 publications 2022: 4 publications 2023: 2 publications 2024: 0 publications 2025: 2 publications
1968 2025

255 publications in total across all disciplines

View publications per year as a table
Ken-ichi Aika: publications per year, 1968 to 2025
Year Publications
1968 1
1969 2
1970 2
1971 3
1972 2
1973 0
1974 2
1975 4
1976 2
1977 2
1978 1
1979 1
1980 0
1981 2
1982 3
1983 4
1984 6
1985 5
1986 10
1987 2
1988 9
1989 3
1990 7
1991 6
1992 9
1993 3
1994 5
1995 7
1996 9
1997 4
1998 12
1999 8
2000 11
2001 20
2002 16
2003 15
2004 18
2005 12
2006 7
2007 4
2008 1
2009 3
2010 2
2011 0
2012 0
2013 0
2014 0
2015 0
2016 0
2017 1
2018 1
2019 0
2020 0
2021 0
2022 4
2023 2
2024 0
2025 2
Total 255
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Ken-ichi Aika 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 Ken-ichi Aika 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, 241–260 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: 247 publications — 49th percentile

49% 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 1,100 247
261–280 979
281–300 939
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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Ken-ichi Aika 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 Ken-ichi Aika 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, 62–63 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: 62 D-Index — 52nd percentile

52% 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
60–61 882
62–63 834 62
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

Ken-ichi Aika is affiliated with the Tokyo Institute of Technology in Japan. Their research focuses primarily on areas within Materials Science, Chemical Engineering, and Chemistry, with notable contributions across subfields such as Materials Chemistry, Catalysis, Organic Chemistry, Inorganic Chemistry, and Ceramics and Composites.

The scientist's research encompasses several main topics, including:

  • Ammonia Synthesis and Nitrogen Reduction
  • Luminescence Properties of Advanced Materials
  • Nanomaterials for Catalytic Reactions
  • Hydrogen Storage and Materials
  • Inorganic Fluorides and Related Compounds
  • Solid-state Spectroscopy and Crystallography
  • Glass Properties and Applications

Ken-ichi Aika has contributed to publications in journals such as ACS Omega and ChemSusChem. Their recent papers include:

  • "Catalytic Behavior of K-doped Fe/MgO Catalysts for Ammonia Synthesis Under Mild Reaction Conditions," 2023, ChemSusChem
  • "Pressure Swing Absorption and Desorption of Ammonia in Calcium Halide Solid Mixtures," 2025, ACS Omega
  • "Correction to 'Pressure Swing Absorption and Desorption of Ammonia in Calcium Halide Solid Mixtures'," 2025, ACS Omega

The scientist frequently collaborates with other researchers. Notable co-authors include:

  • Manabu Tokushige
  • Ryota Fujisawa
  • Junichi Ryu
  • K. Era
  • Katsutoshi Sato

Aika's work integrates catalytic processes and materials chemistry topics, with significant exploration of ammonia synthesis and nitrogen reduction, which are critical areas in chemical engineering and sustainable chemistry.

Best Publications

  • Activation of nitrogen by alkali metal promoted transition metal I. Ammonia synthesis over ruthenium promoted by alkali metal

    Ken-ichi Aika;Humio Hori;Atsumu Ozaki

  • Titania-supported cobalt and nickel bimetallic catalysts for carbon dioxide reforming of methane

    Kazuhiro Takanabe;Katsutoshi Nagaoka;Kentaro Nariai;Ken Ichi Aika

  • Photocatalytic decomposition of water over NiOK4Nb6O17 catalyst

    Akihiko Kudo;Akira Tanaka;Kazunari Domen;Ken ichi Maruya

  • Preparation and characterization of chlorine-free ruthenium catalysts and the promoter effect in ammonia synthesis: 3. A magnesia-supported ruthenium catalyst

    Ken-ichi Aika;Tomiko Takano;Shuzo Murata

  • Sustainable hydrogen from bio-oil - Steam reforming of acetic acid as a model oxygenate

    Kazuhiro Takanabe;Ken-ichi Aika;Kulathuiyer Seshan;Leon Lefferts

  • Support and promoter effect of ruthenium catalyst: II. Ruthenium/alkaline earth catalyst for activation of dinitrogen

    K. Aika;A. Ohya;A. Ozaki;Y. Inoue

  • Preparation of Ru Nanoparticles Supported on γ-Al2O3 and Its Novel Catalytic Activity for Ammonia Synthesis

    Akane Miyazaki;Ioan Balint;Ken-ichi Aika;Yoshio Nakano

  • Carbon Deposition during Carbon Dioxide Reforming of Methane—Comparison between Pt/Al2O3 and Pt/ZrO2

    Katsutoshi Nagaoka;Kulathuiyer Seshan;Ken-ichi Aika;Johannes A. Lercher

  • Surface reactions of oxygen ions. I. Dehydrogenation of alkanes by oxygen(1-) ions on magnesium oxide

    Kenichi Aika;Jack H. Lunsford

  • The electronic structure of oxygen atom vacancy and hydroxyl impurity defects on titanium dioxide (110) surface.

    Taketoshi Minato;Yasuyuki Sainoo;Yousoo Kim;Hiroyuki S. Kato

  • Cobalt molybdenum bimetallic nitride catalysts for ammonia synthesis: Part 2. Kinetic study

    Ryoichi Kojima;Ken-ichi Aika

  • Support and promoter effect of ruthenium catalyst. III. Kinetics of ammonia synthesis over various Ru catalysts

    K. Aika;M. Kumasaka;T. Oma;O. Kato

  • Support and promoter effect of ruthenium catalyst: I. Characterization of alkali-promoted ruthenium/alumina catalysts for ammonia synthesis

    K. Aika;K. Shimazaki;Y. Hattori;A. Ohya

  • Cobalt molybdenum bimetallic nitride catalysts for ammonia synthesis: Part 1. Preparation and characterization

    Ryoichi Kojima;Ken-ichi Aika

  • Role of alkali promoter in ammonia synthesis over ruthenium catalysts—Effect on reaction mechanism

    Unknown

  • Molybdenum nitride and carbide catalysts for ammonia synthesis

    Ryoichi Kojima;Ken-ichi Aika

  • Modification of Co/TiO2 for dry reforming of methane at 2 MPa by Pt, Ru or Ni

    Katsutoshi Nagaoka;Kazuhiro Takanabe;Ken-ichi Aika

  • Steam reforming of acetic acid as a biomass derived oxygenate: Bifunctional pathway for hydrogen formation over Pt/ZrO2 catalysts

    K. Takanabe;Ken-ichi Aika;Koji Inazu;Toshihide Baba

  • Catalyst deactivation during steam reforming of acetic acid over Pt/ZrO2.

    Kazuhiro Takanabe;Ken-ichi Aika;K. Seshan;Leon Lefferts

  • Preparation and characterization of chlorine-free ruthenium catalysts and the promoter effect in ammonia synthesis: 2. A lanthanide oxide-promoted Ru/Al2O3 catalyst

    Shuzo Murata;Ken-ichi Aika

  • The Effect of Lanthanide Oxides as a Support for Ruthenium Catalysts in Ammonia Synthesis

    Yusuke Niwa;Ken-ichi Aika

Frequent Co-Authors

Takaharu Onishi
Takaharu Onishi University of Tokyo
Kazuhiro Takanabe
Kazuhiro Takanabe University of Tokyo
Kulathuiyer Seshan
Kulathuiyer Seshan University of Twente
Leonardus Lefferts
Leonardus Lefferts University of Twente
Johannes A. Lercher
Johannes A. Lercher Technical University of Munich
Kulathuiyer Seshan
Kulathuiyer Seshan University of Twente
Yasuo Wakatsuki
Yasuo Wakatsuki Bridgestone (Japan)
Jun Kubota
Jun Kubota Fukuoka University
Kazunari Domen
Kazunari Domen University of Tokyo
Jack H. Lunsford
Jack H. Lunsford Texas A&M University

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