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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 85 2637 2376 145 138 289 30296

Kazuhiro Sayama publications per year

The chart shows the history of publications by Kazuhiro Sayama between 1989 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kazuhiro Sayama published across 38 years, from 1989 to 2026, averaging 8.5 papers a year. Output peaked at 18 publications in 1998. 5 of the 323 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1989 to 2026. Vertical axis: number of publications, 0 to 18. Peak 18 publications in 1998. 1989: 1 publication 1990: 3 publications 1991: 3 publications 1992: 8 publications 1993: 5 publications 1994: 2 publications 1995: 4 publications 1996: 5 publications 1997: 9 publications 1998: 18 publications 1999: 12 publications 2000: 13 publications 2001: 13 publications 2002: 14 publications 2003: 17 publications 2004: 8 publications 2005: 9 publications 2006: 12 publications 2007: 8 publications 2008: 9 publications 2009: 8 publications 2010: 11 publications 2011: 6 publications 2012: 10 publications 2013: 10 publications 2014: 11 publications 2015: 6 publications 2016: 12 publications 2017: 6 publications 2018: 8 publications 2019: 9 publications 2020: 8 publications 2021: 12 publications 2022: 13 publications 2023: 6 publications 2024: 9 publications 2025: 3 publications 2026: 2 publications
1989 2026

323 publications in total across all disciplines

View publications per year as a table
Kazuhiro Sayama: publications per year, 1989 to 2026
Year Publications
1989 1
1990 3
1991 3
1992 8
1993 5
1994 2
1995 4
1996 5
1997 9
1998 18
1999 12
2000 13
2001 13
2002 14
2003 17
2004 8
2005 9
2006 12
2007 8
2008 9
2009 8
2010 11
2011 6
2012 10
2013 10
2014 11
2015 6
2016 12
2017 6
2018 8
2019 9
2020 8
2021 12
2022 13
2023 6
2024 9
2025 3
2026 2
Total 323
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Kazuhiro Sayama 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 Kazuhiro Sayama 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: 289 publications — 60th percentile

60% 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
281–300 939 289
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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Kazuhiro Sayama 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 Kazuhiro Sayama 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, 84–85 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: 85 D-Index — 85th percentile

85% 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
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 85
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

Kazuhiro Sayama is affiliated with the National Institute of Advanced Industrial Science and Technology in Japan. Their research primarily focuses on the fields of Energy and Materials Science, with significant contributions to Renewable Energy, Sustainability and the Environment, as well as Materials Chemistry.

The scientist has published extensively on topics including Advanced Photocatalysis Techniques, TiO2 Photocatalysis and Solar Cells, Copper-based nanomaterials and applications, Catalytic Processes in Materials Science, Gas Sensing Nanomaterials and Sensors, Perovskite Materials and Applications, and Electrocatalysts for Energy Conversion.

Frequently published venues for their work include:

  • ACS Applied Energy Materials
  • ACS Sustainable Chemistry & Engineering
  • ACS Applied Materials & Interfaces
  • Journal of the Ceramic Society of Japan
  • Sustainable Energy & Fuels

Notable recent papers authored or coauthored by Kazuhiro Sayama include:

  • Electrochemical and Photoelectrochemical Water Oxidation for Hydrogen Peroxide Production, 2020, Angewandte Chemie International Edition
  • Efficiency Accreditation and Testing Protocols for Particulate Photocatalysts toward Solar Fuel Production, 2021, Joule
  • Photocatalytic H2O2 production from O2 under visible light irradiation over phosphate ion-coated Pd nanoparticles-supported BiVO4, 2020, Applied Catalysis B: Environmental
  • An Artificial Z-Scheme Constructed from Dye-Sensitized Metal Oxide Nanosheets for Visible Light-Driven Overall Water Splitting, 2020, Journal of the American Chemical Society
  • Photoelectrochemical Oxidation of Glycerol to Dihydroxyacetone Over an Acid-Resistant Ta:BiVO4 Photoanode, 2022, ACS Sustainable Chemistry & Engineering

Kazuhiro Sayama has collaborated frequently with coauthors such as:

  • Yugo Miseki
  • Masanori Kodera
  • Kazuhiko Maeda
  • Hitoshi Kusama
  • Sayuri Okunaka

Their work mainly investigates photocatalysis and photoelectrochemical processes applied to energy conversion and environmental applications. This includes research on photocatalytic water splitting, solar fuel production, hydrogen peroxide synthesis, and related catalytic and electrocatalytic systems.

Best Publications

  • Direct splitting of water under visible light irradiation with an oxide semiconductor photocatalyst

    Zhigang ZoU;Ji nhua Ye;Kazuhiro Sayama;Hironori Arakawa

  • Molecular Design of Coumarin Dyes for Efficient Dye-Sensitized Solar Cells

    Kohjiro Hara;Tadatake Sato;Ryuzi Katoh;Akihiro Furube

  • Design of new coumarin dyes having thiophene moieties for highly efficient organic-dye-sensitized solar cells

    Kohjiro Hara;Mitsuhiko Kurashige;Yasufumi Dan-oh;Chiaki Kasada

  • Highly efficient photon-to-electron conversion with mercurochrome-sensitized nanoporous oxide semiconductor solar cells

    Kohjiro Hara;Takaro Horiguchi;Tohru Kinoshita;Kazuhiro Sayama

  • A coumarin-derivative dye sensitized nanocrystalline TiO2 solar cell having a high solar-energy conversion efficiency up to 5.6%

    Kohjiro Hara;Kazuhiro Sayama;Yasuyo Ohga;Akira Shinpo

  • Photoelectrochemical Properties of a Porous Nb2O5 Electrode Sensitized by a Ruthenium Dye

    Kazuhiro Sayama;Hideki Sugihara;Hironori Arakawa

  • Photoelectrochemical Decomposition of Water into H2 and O2 on Porous BiVO4 Thin-Film Electrodes under Visible Light and Significant Effect of Ag Ion Treatment

    Kazuhiro Sayama;Atsushi Nomura;Takeo Arai;Tsuyoshi Sugita

  • Stoichiometric water splitting into H2 and O2 using a mixture of two different photocatalysts and an IO3-/I- shuttle redox mediator under visible light irradiation.

    Kazuhiro Sayama;Kazuaki Mukasa;Ryu Abe;Yoshimoto Abe

  • Effect of additives on the photovoltaic performance of coumarin-dye-sensitized nanocrystalline TiO2 solar cells.

    Kohjiro Hara;Yasufumi Dan-oh;Chiaki Kasada;Yasuyo Ohga

  • Photoelectrochemical Properties of J Aggregates of Benzothiazole Merocyanine Dyes on a Nanostructured TiO2 Film

    Kazuhiro Sayama;Shingo Tsukagoshi;Kohjiro Hara;Yasuyo Ohga

  • A new photocatalytic water splitting system under visible light irradiation mimicking a Z-scheme mechanism in photosynthesis

    Kazuhiro Sayama;Kazuaki Mukasa;Ryu Abe;Yoshimoto Abe

  • Photocatalytic decomposition of water and photocatalytic reduction of carbon dioxide over zirconia catalyst

    Unknown

  • A new type of water splitting system composed of two different TiO2 photocatalysts (anatase, rutile) and a IO3−/I− shuttle redox mediator

    Ryu Abe;Ryu Abe;Kazuhiro Sayama;Kazunari Domen;Hironori Arakawa

  • Development of new photocatalytic water splitting into H2 and O2 using two different semiconductor photocatalysts and a shuttle redox mediator IO3-/I-.

    Ryu Abe;Kazuhiro Sayama;Hideki Sugihara

  • Photosensitization of a porous TiO2 electrode with merocyanine dyes containing a carboxyl group and a long alkyl chain

    Kazuhiro Sayama;Kohjiro Hara;Nahoko Mori;Makoto Satsuki

  • Efficient sensitization of nanocrystalline TiO2 films with cyanine and merocyanine organic dyes

    Kazuhiro Sayama;Shingo Tsukagoshi;Tohru Mori;Kohjiro Hara

  • Novel polyene dyes for highly efficient dye-sensitized solar cells.

    Kohjiro Hara;Mitsuhiko Kurashige;Shunichiro Ito;Akira Shinpo

  • Photocatalytic Activity of R3MO7 and R2Ti2O7 (R = Y, Gd, La; M = Nb, Ta) for Water Splitting into H2 and O2

    Ryu Abe;Masanobu Higashi;Kazuhiro Sayama;Yoshimoto Abe

  • Photoelectrochemical decomposition of water on nanocrystalline BiVO4 film electrodes under visible light.

    Kazuhiro Sayama;Atsushi Nomura;Zhigang Zou;Ryu Abe

  • Nickel-loaded K4Nb6O17 photocatalyst in the decomposition of H2O into H2 and O2: Structure and reaction mechanism

    Akihiko Kudo;K. Sayama;A. Tanaka;K. Asakura

  • Steady hydrogen evolution from water on Eosin Y-fixed TiO2 photocatalyst using a silane-coupling reagent under visible light irradiation

    Ryu Abe;Koujirou Hara;Kazuhiro Sayama;Kazunari Domen

Frequent Co-Authors

Hideki Sugihara
Hideki Sugihara National Institute of Advanced Industrial Science and Technology
Hironori Arakawa
Hironori Arakawa Tokyo University of Science
Kohjiro Hara
Kohjiro Hara National Institute of Advanced Industrial Science and Technology
Ryu Abe
Ryu Abe Kyoto University
Masatoshi Yanagida
Masatoshi Yanagida National Institute for Materials Science
Kazunari Domen
Kazunari Domen University of Tokyo
Takaharu Onishi
Takaharu Onishi University of Tokyo
Mohammad Khaja Nazeeruddin
Mohammad Khaja Nazeeruddin École Polytechnique Fédérale de Lausanne
Zhigang Zou
Zhigang Zou Nanjing University
Jinhua Ye
Jinhua Ye National Institute for Materials Science

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