World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 70 5980 5425 434 391 172 14908
Biology and Biochemistry 64 9735 8986 710 671 144 13720

Thomas Happe publications per year

The chart shows the history of publications by Thomas Happe between 1993 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Thomas Happe published across 33 years, from 1993 to 2025, averaging 5.9 papers a year. Output peaked at 21 publications in 2018. 19 of the 194 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1993 to 2025. Vertical axis: number of publications, 0 to 21. Peak 21 publications in 2018. 1993: 1 publication 1994: 1 publication 1995: 0 publications 1996: 0 publications 1997: 0 publications 1998: 0 publications 1999: 0 publications 2000: 1 publication 2001: 3 publications 2002: 9 publications 2003: 1 publication 2004: 5 publications 2005: 4 publications 2006: 0 publications 2007: 2 publications 2008: 4 publications 2009: 9 publications 2010: 7 publications 2011: 9 publications 2012: 10 publications 2013: 6 publications 2014: 6 publications 2015: 9 publications 2016: 5 publications 2017: 15 publications 2018: 21 publications 2019: 12 publications 2020: 10 publications 2021: 7 publications 2022: 6 publications 2023: 12 publications 2024: 9 publications 2025: 10 publications
1993 2025

194 publications in total across all disciplines

View publications per year as a table
Thomas Happe: publications per year, 1993 to 2025
Year Publications
1993 1
1994 1
1995 0
1996 0
1997 0
1998 0
1999 0
2000 1
2001 3
2002 9
2003 1
2004 5
2005 4
2006 0
2007 2
2008 4
2009 9
2010 7
2011 9
2012 10
2013 6
2014 6
2015 9
2016 5
2017 15
2018 21
2019 12
2020 10
2021 7
2022 6
2023 12
2024 9
2025 10
Total 194
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Thomas Happe 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 Thomas Happe 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, 161–180 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: 172 publications — 22nd percentile

22% 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 1,350 172
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
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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Thomas Happe 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 Thomas Happe 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, 70–71 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: 70 D-Index — 68th percentile

68% 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 70
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

Thomas Happe is affiliated with Ruhr University Bochum in Germany. Their research primarily focuses on topics related to energy and biochemistry, genetics, and molecular biology. The scientist's work extensively covers subfields such as renewable energy, sustainability and the environment, molecular biology, catalysis, electrical and electronic engineering, and materials chemistry.

The main topics addressed in Thomas Happe's research include:

  • Metalloenzymes and iron-sulfur proteins
  • Electrocatalysts for energy conversion
  • Ammonia synthesis and nitrogen reduction
  • Photosynthetic processes and mechanisms
  • Hydrogen storage and materials
  • Advanced battery technologies research
  • Metal-catalyzed oxygenation mechanisms

Recent papers from Thomas Happe demonstrate a focus on hydrogenase enzymes and proton-coupled electron transfer, as well as molecular mechanisms related to photosynthesis and catalyst stabilization. Selected publications include:

  • "A safety cap protects hydrogenase from oxygen attack," 2021, Nature Communications
  • "The roles of long-range proton-coupled electron transfer in the directionality and efficiency of [FeFe]-hydrogenases," 2020, Proceedings of the National Academy of Sciences
  • "Shedding Light on Proton and Electron Dynamics in [FeFe] Hydrogenases," 2020, Journal of the American Chemical Society
  • "Modelling Photosynthesis with ZnII-Protoporphyrin All-DNA G-Quadruplex/Aptamer Scaffolds," 2020, Angewandte Chemie International Edition
  • "Cyanide Binding to [FeFe]-Hydrogenase Stabilizes the Alternative Configuration of the Proton Transfer Pathway," 2022, Angewandte Chemie International Edition

Frequent coauthors in Thomas Happe's research include Vera Engelbrecht, Jifu Duan, Ulf-Peter Apfel, Anja Hemschemeier, and Martin Winkler. The collaboration network suggests a strong interdisciplinary approach involving multiple specialists.

Thomas Happe's work has appeared in several prominent publication venues. These include:

  • Angewandte Chemie International Edition
  • Angewandte Chemie
  • Journal of the American Chemical Society
  • Proceedings of the National Academy of Sciences
  • Chemical Science

The research outputs from Thomas Happe contribute to understanding energy conversion processes, particularly via bioinspired catalysts and metalloenzymes, and emphasize molecular mechanisms underpinning sustainability and renewable energy technologies.

Best Publications

  • Hydrogen Production. Green Algae as a Source of Energy

    Anastasios Melis;Thomas Happe

  • Biomimetic assembly and activation of [FeFe]-hydrogenases

    Gustav Berggren;Gustav Berggren;Gustav Berggren;A. Adamska;C. Lambertz;T. R. Simmons

  • Biochemical and morphological characterization of sulfur-deprived and H2-producing Chlamydomonas reinhardtii (green alga).

    Liping Zhang;Thomas Happe;Anastasios Melis

  • Isolation, characterization and N‐terminal amino acid sequence of hydrogenase from the green alga Chlamydomonas reinhardtii

    Thomas Happe;J. Dirk Naber

  • How oxygen attacks [FeFe] hydrogenases from photosynthetic organisms.

    Sven T. Stripp;Gabrielle Goldet;Caterina Brandmayr;Oliver Sanganas

  • Spontaneous activation of [FeFe]-hydrogenases by an inorganic [2Fe] active site mimic

    Julian Esselborn;Camilla Lambertz;Agnieszka Adamska-Venkatesh;Trevor Simmons

  • A Novel Type of Iron Hydrogenase in the Green AlgaScenedesmus obliquus Is Linked to the Photosynthetic Electron Transport Chain

    Lore Florin;Anestis Tsokoglou;Thomas Happe

  • Differential regulation of the Fe-hydrogenase during anaerobic adaptation in the green alga Chlamydomonas reinhardtii.

    Thomas Happe;Annette Kaminski

  • Expression of two [Fe]-hydrogenases in Chlamydomonas reinhardtii under anaerobic conditions.

    Marc Forestier;Paul King;Liping Zhang;Matthew Posewitz

  • The surprising diversity of clostridial hydrogenases: a comparative genomic perspective

    Magdalena Calusinska;Thomas Happe;Bernard Joris;Annick Wilmotte

  • Hydrogen production by Chlamydomonas reinhardtii : an elaborate interplay of electron sources and sinks

    Anja Hemschemeier;Swanny Fouchard;Laurent Cournac;Gilles Peltier

  • Identification and Characterization of the “Super-Reduced” State of the H-Cluster in [FeFe] Hydrogenase: A New Building Block for the Catalytic Cycle?†

    Agnieszka Adamska;Alexey Silakov;Camilla Lambertz;Olaf Rüdiger

  • Induction, localization and metal content of hydrogenase in the green alga Chlamydomonas reinhardtii

    Thomas Happe;Britta Mosler;J. Dirk Naber

  • Transcriptional and mutational analysis of the uptake hydrogenase of the filamentous cyanobacterium Anabaena variabilis ATCC 29413.

    Thomas Happe;Kathrin Schütz;Herbert Böhme

  • Analytical approaches to photobiological hydrogen production in unicellular green algae.

    Anja Hemschemeier;Anastasios Melis;Thomas Happe

  • Cyanobacterial H2 production - a comparative analysis

    Kathrin Schütz;Thomas Happe;Olga Troshina;Olga Troshina;Peter Lindblad

  • Hydrogenases in green algae: do they save the algae's life and solve our energy problems?

    Thomas Happe;Anja Hemschemeier;Martin Winkler;Annette Kaminski

  • Electrochemical kinetic investigations of the reactions of [FeFe]-hydrogenases with carbon monoxide and oxygen: comparing the importance of gas tunnels and active-site electronic/redox effects.

    Gabrielle Goldet;Caterina Brandmayr;Sven T Stripp;Thomas Happe

  • Control of Hydrogen Photoproduction by the Proton Gradient Generated by Cyclic Electron Flow in Chlamydomonas reinhardtii

    Dimitri Tolleter;Dimitri Tolleter;Dimitri Tolleter;Bart Ghysels;Bart Ghysels;Bart Ghysels;Jean Alric;Dimitris Petroutsos

  • Autotrophic and Mixotrophic Hydrogen Photoproduction in Sulfur-Deprived Chlamydomonas Cells

    Swanny Fouchard;Anja Hemschemeier;Amandine Caruana;Jérémy Pruvost

Frequent Co-Authors

Wolfgang Lubitz
Wolfgang Lubitz Max Planck Society
Michael Haumann
Michael Haumann Freie Universität Berlin
Fraser A. Armstrong
Fraser A. Armstrong University of Oxford
Anastasios Melis
Anastasios Melis University of California, Berkeley
Gilles Peltier
Gilles Peltier CEA Cadarache
Laurent Cournac
Laurent Cournac Aix-Marseille University
Joachim Heberle
Joachim Heberle Freie Universität Berlin
Marc Fontecave
Marc Fontecave Collège de France
Michael Hippler
Michael Hippler University of Münster
Donald A. Bryant
Donald A. Bryant Pennsylvania State University

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