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
Materials Science 49 10576 10215 654 623 287 8332
Chemistry 48 15280 13773 1198 1087 207 7925

Hajime Arai publications per year

The chart shows the history of publications by Hajime Arai between 1969 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Hajime Arai published across 57 years, from 1969 to 2025, averaging 5.4 papers a year. Output peaked at 30 publications in 2014. 38 of the 309 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 1969 to 2025. Vertical axis: number of publications, 0 to 30. Peak 30 publications in 2014. 1969: 1 publication 1970: 0 publications 1971: 0 publications 1972: 0 publications 1973: 0 publications 1974: 0 publications 1975: 0 publications 1976: 0 publications 1977: 1 publication 1978: 0 publications 1979: 0 publications 1980: 0 publications 1981: 0 publications 1982: 0 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 0 publications 1987: 0 publications 1988: 0 publications 1989: 2 publications 1990: 0 publications 1991: 0 publications 1992: 1 publication 1993: 0 publications 1994: 0 publications 1995: 4 publications 1996: 2 publications 1997: 5 publications 1998: 6 publications 1999: 3 publications 2000: 2 publications 2001: 3 publications 2002: 5 publications 2003: 7 publications 2004: 4 publications 2005: 1 publication 2006: 1 publication 2007: 7 publications 2008: 10 publications 2009: 14 publications 2010: 5 publications 2011: 29 publications 2012: 16 publications 2013: 19 publications 2014: 30 publications 2015: 17 publications 2016: 25 publications 2017: 10 publications 2018: 4 publications 2019: 3 publications 2020: 7 publications 2021: 6 publications 2022: 6 publications 2023: 15 publications 2024: 27 publications 2025: 11 publications
1969 2025

309 publications in total across all disciplines

View publications per year as a table
Hajime Arai: publications per year, 1969 to 2025
Year Publications
1969 1
1970 0
1971 0
1972 0
1973 0
1974 0
1975 0
1976 0
1977 1
1978 0
1979 0
1980 0
1981 0
1982 0
1983 0
1984 0
1985 0
1986 0
1987 0
1988 0
1989 2
1990 0
1991 0
1992 1
1993 0
1994 0
1995 4
1996 2
1997 5
1998 6
1999 3
2000 2
2001 3
2002 5
2003 7
2004 4
2005 1
2006 1
2007 7
2008 10
2009 14
2010 5
2011 29
2012 16
2013 19
2014 30
2015 17
2016 25
2017 10
2018 4
2019 3
2020 7
2021 6
2022 6
2023 15
2024 27
2025 11
Total 309
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Hajime Arai publication distribution in Materials Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Materials Science in 2026. The highlighted bar marks where Hajime Arai sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 57 bars. Horizontal axis: publications, 50–69 to 1,163+. Vertical axis: number of scientists, 0 to 891. Most scientists, 891, have 190–209 publications. The last bar groups every scientist with 1,163 publications or more. The highlighted bar, 270–289 publications, is where this scientist sits. 50–69 publications: 28 scientists 70–89 publications: 152 scientists 90–109 publications: 356 scientists 110–129 publications: 487 scientists 130–149 publications: 723 scientists 150–169 publications: 835 scientists 170–189 publications: 850 scientists 190–209 publications: 891 scientists 210–229 publications: 862 scientists 230–249 publications: 766 scientists 250–269 publications: 726 scientists 270–289 publications: 665 scientists 290–309 publications: 593 scientists 310–329 publications: 537 scientists 330–349 publications: 477 scientists 350–369 publications: 440 scientists 370–389 publications: 356 scientists 390–409 publications: 321 scientists 410–429 publications: 256 scientists 430–449 publications: 246 scientists 450–469 publications: 216 scientists 470–489 publications: 212 scientists 490–509 publications: 174 scientists 510–529 publications: 194 scientists 530–549 publications: 162 scientists 550–569 publications: 131 scientists 570–589 publications: 111 scientists 590–609 publications: 103 scientists 610–629 publications: 99 scientists 630–649 publications: 77 scientists 650–669 publications: 92 scientists 670–689 publications: 56 scientists 690–709 publications: 53 scientists 710–729 publications: 53 scientists 730–749 publications: 38 scientists 750–769 publications: 52 scientists 770–789 publications: 43 scientists 790–809 publications: 38 scientists 810–829 publications: 34 scientists 830–849 publications: 25 scientists 850–869 publications: 18 scientists 870–889 publications: 20 scientists 890–909 publications: 24 scientists 910–929 publications: 27 scientists 930–949 publications: 20 scientists 950–969 publications: 17 scientists 970–989 publications: 10 scientists 990–1,009 publications: 16 scientists 1,010–1,029 publications: 13 scientists 1,030–1,049 publications: 12 scientists 1,050–1,069 publications: 9 scientists 1,070–1,089 publications: 8 scientists 1,090–1,109 publications: 7 scientists 1,110–1,129 publications: 9 scientists 1,130–1,149 publications: 2 scientists 1,150–1,162 publications: 5 scientists 1,163+ publications: 100 scientists
50–69 publications 1,163+

This scientist: 287 publications — 57th percentile

57% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,163 publications or more.

View publications distribution as a table
Number of Materials Science scientists by publication count, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
Publications Scientists This scientist
50–69 28
70–89 152
90–109 356
110–129 487
130–149 723
150–169 835
170–189 850
190–209 891
210–229 862
230–249 766
250–269 726
270–289 665 287
290–309 593
310–329 537
330–349 477
350–369 440
370–389 356
390–409 321
410–429 256
430–449 246
450–469 216
470–489 212
490–509 174
510–529 194
530–549 162
550–569 131
570–589 111
590–609 103
610–629 99
630–649 77
650–669 92
670–689 56
690–709 53
710–729 53
730–749 38
750–769 52
770–789 43
790–809 38
810–829 34
830–849 25
850–869 18
870–889 20
890–909 24
910–929 27
930–949 20
950–969 17
970–989 10
990–1,009 16
1,010–1,029 13
1,030–1,049 12
1,050–1,069 9
1,070–1,089 8
1,090–1,109 7
1,110–1,129 9
1,130–1,149 2
1,150–1,162 5
1,163+ 100
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Hajime Arai D-index placement in Materials Science in 2026

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

No. of scientists
200 400 600
Bar chart with 64 bars. Horizontal axis: D-Index, 40–41 to 165+. Vertical axis: number of scientists, 0 to 667. Most scientists, 667, have 52–53 D-Index. The last bar groups every scientist with 165 D-Index or more. The highlighted bar, 48–49 D-Index, is where this scientist sits. 40–41 D-Index: 211 scientists 42–43 D-Index: 450 scientists 44–45 D-Index: 612 scientists 46–47 D-Index: 612 scientists 48–49 D-Index: 598 scientists 50–51 D-Index: 657 scientists 52–53 D-Index: 667 scientists 54–55 D-Index: 621 scientists 56–57 D-Index: 597 scientists 58–59 D-Index: 610 scientists 60–61 D-Index: 587 scientists 62–63 D-Index: 606 scientists 64–65 D-Index: 533 scientists 66–67 D-Index: 490 scientists 68–69 D-Index: 469 scientists 70–71 D-Index: 378 scientists 72–73 D-Index: 421 scientists 74–75 D-Index: 359 scientists 76–77 D-Index: 323 scientists 78–79 D-Index: 299 scientists 80–81 D-Index: 230 scientists 82–83 D-Index: 210 scientists 84–85 D-Index: 195 scientists 86–87 D-Index: 203 scientists 88–89 D-Index: 175 scientists 90–91 D-Index: 175 scientists 92–93 D-Index: 142 scientists 94–95 D-Index: 121 scientists 96–97 D-Index: 117 scientists 98–99 D-Index: 107 scientists 100–101 D-Index: 88 scientists 102–103 D-Index: 85 scientists 104–105 D-Index: 68 scientists 106–107 D-Index: 62 scientists 108–109 D-Index: 57 scientists 110–111 D-Index: 45 scientists 112–113 D-Index: 49 scientists 114–115 D-Index: 50 scientists 116–117 D-Index: 34 scientists 118–119 D-Index: 38 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 29 scientists 124–125 D-Index: 28 scientists 126–127 D-Index: 24 scientists 128–129 D-Index: 33 scientists 130–131 D-Index: 28 scientists 132–133 D-Index: 21 scientists 134–135 D-Index: 20 scientists 136–137 D-Index: 23 scientists 138–139 D-Index: 17 scientists 140–141 D-Index: 12 scientists 142–143 D-Index: 17 scientists 144–145 D-Index: 21 scientists 146–147 D-Index: 13 scientists 148–149 D-Index: 11 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 13 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 4 scientists 162–163 D-Index: 4 scientists 164 D-Index: 3 scientists 165+ D-Index: 98 scientists
40–41 D-Index 165+

This scientist: 49 D-Index — 19th percentile

19% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 165 D-Index or more.

View D-Index distribution as a table
Number of Materials Science scientists by D-index, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
D-Index Scientists This scientist
40–41 211
42–43 450
44–45 612
46–47 612
48–49 598 49
50–51 657
52–53 667
54–55 621
56–57 597
58–59 610
60–61 587
62–63 606
64–65 533
66–67 490
68–69 469
70–71 378
72–73 421
74–75 359
76–77 323
78–79 299
80–81 230
82–83 210
84–85 195
86–87 203
88–89 175
90–91 175
92–93 142
94–95 121
96–97 117
98–99 107
100–101 88
102–103 85
104–105 68
106–107 62
108–109 57
110–111 45
112–113 49
114–115 50
116–117 34
118–119 38
120–121 37
122–123 29
124–125 28
126–127 24
128–129 33
130–131 28
132–133 21
134–135 20
136–137 23
138–139 17
140–141 12
142–143 17
144–145 21
146–147 13
148–149 11
150–151 14
152–153 13
154–155 9
156–157 10
158–159 7
160–161 4
162–163 4
164 3
165+ 98
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Overview

Hajime Arai is affiliated with the Tokyo Institute of Technology in Japan. Their research primarily focuses on the engineering field, with notable specialization in electrical and electronic engineering, automotive engineering, renewable energy, sustainability and the environment, materials chemistry, and electronic, optical, and magnetic materials.

The main topics covered in Arai's research include advancements in battery materials, advanced battery materials and technologies, advanced battery technologies research, electrocatalysts for energy conversion, fuel cells and related materials, and supercapacitor materials and fabrication.

Frequent collaborators in their work include Atsunori Ikezawa, Takeyoshi Okajima, Ryoji Kanno, Kota Suzuki, and Masaaki Hirayama.

Hajime Arai has contributed to a number of scientific publications, with a focus on journals and venues such as ECS Meeting Abstracts, Journal of Power Sources, Journal of Materials Chemistry A, ACS Applied Energy Materials, and Electrochemistry. The following recent papers illustrate the scope and focus of their work:

  • Performance of Li4Ti5O12-based reference electrode for the electrochemical analysis of all-solid-state lithium-ion batteries, 2020, Electrochemistry Communications
  • Bifunctional electrocatalysts of lanthanum-based perovskite oxide with Sb-doped SnO2 for oxygen reduction and evolution reactions, 2020, Journal of Power Sources
  • Effects of aluminum substitution in nickel-rich layered LiNixAl1−xO2 (x = 0.92, 0.95) positive electrode materials for Li-ion batteries on high-rate cycle performance, 2021, Journal of Materials Chemistry A
  • Single-Crystal-like Durable LiNiO2 Positive Electrode Materials for Lithium-Ion Batteries, 2022, ACS Applied Materials & Interfaces
  • AC impedance analysis of NCM523 composite electrodes in all-solid-state three electrode cells and their degradation behavior, 2023, Journal of Power Sources

Best Publications

  • Characterization and cathode performance of Li1 − xNi1 + xO2 prepared with the excess lithium method

    H. Arai;S. Okada;H. Ohtsuka;M. Ichimura

  • Synthesis, redox potential evaluation and electrochemical characteristics of NASICON-related-3D framework compounds

    K. S. Nanjundaswamy;A. K. Padhi;John B Goodenough;S. Okada

  • Thermal behavior of Li1-yNiO2 and the decomposition mechanism

    Hajime Arai;Shigeto Okada;Yoji Sakurai;Jun Ichi Yamaki

  • Cathode performance and voltage estimation of metal trihalides

    Hajime Arai;Shigeto Okada;Yoji Sakurai;Jun Ichi Yamaki

  • Electrochemical and thermal behavior of LiNi1-zMzO2 (M = Co, Mn, Ti)

    Hajime Arai;Shigeto Okada;Yoji Sakurai;Jun Ichi Yamaki

  • Direct observation of reversible oxygen anion redox reaction in Li-rich manganese oxide, Li2MnO3, studied by soft X-ray absorption spectroscopy

    Masatsugu Oishi;Keisuke Yamanaka;Iwao Watanabe;Iwao Watanabe;Keiji Shimoda

  • Direct Observation of a Metastable Crystal Phase of LixFePO4 under Electrochemical Phase Transition

    Yuki Orikasa;Takehiro Maeda;Yukinori Koyama;Haruno Murayama

  • Reversibility of LiNiO2 cathode

    Hajime Arai;Shigeto Okada;Yoji Sakurai;Jun Ichi Yamaki

  • First In Situ Observation of the LiCoO2 Electrode/Electrolyte Interface by Total‐Reflection X‐ray Absorption Spectroscopy

    Daiko Takamatsu;Yukinori Koyama;Yuki Orikasa;Shinichiro Mori

  • Charge compensation mechanisms in Li1.16Ni0.15Co0.19Mn0.50O2 positive electrode material for Li-ion batteries analyzed by a combination of hard and soft X-ray absorption near edge structure

    Masatsugu Oishi;Takahiro Fujimoto;Yu Takanashi;Yuki Orikasa

  • Ionic Conduction in Lithium Ion Battery Composite Electrode Governs Cross-sectional Reaction Distribution

    Yuki Orikasa;Yuma Gogyo;Hisao Yamashige;Misaki Katayama

  • Transient phase change in two phase reaction between LiFePO4 and FePO4 under battery operation

    Yuki Orikasa;Takehiro Maeda;Yukinori Koyama;Haruno Murayama

  • Defect Chemistry in Layered LiMO2 (M = Co, Ni, Mn, and Li1/3Mn2/3) by First-Principles Calculations

    Yukinori Koyama;Hajime Arai;Isao Tanaka;Yoshiharu Uchimoto

  • AC Impedance Analysis of Bifunctional Air Electrodes for Metal‐Air Batteries

    Hajime Arai;Stefan Müller;Otto Haas

  • Low temperature synthesis and electrochemical characteristics of LiFeO2 cathodes

    Yoji Sakurai;Hajime Arai;Shigeto Okada;Jun Ichi Yamaki

  • Real-time observations of lithium battery reactions—operando neutron diffraction analysis during practical operation

    Sou Taminato;Masao Yonemura;Shinya Shiotani;Takashi Kamiyama

  • Structural and electronic features of binary Li(2)S-P(2)S(5) glasses.

    Koji Ohara;Akio Mitsui;Akio Mitsui;Masahiro Mori;Yohei Onodera

  • Thermal Reactions Between Delithiated Lithium Nickelate and Electrolyte Solutions

    Unknown

  • Preparation of electrochemically active α-LiFeO2 at low temperature

    Yoji Sakurai;Hajime Arai;Jun-ichi Yamaki

  • Depth-resolved X-ray absorption spectroscopic study on nanoscale observation of the electrode–solid electrolyte interface for all solid state lithium ion batteries

    Toyoki Okumura;Takayuki Nakatsutsumi;Toshiaki Ina;Yuki Orikasa

  • Amorphous Metal Polysulfides: Electrode Materials with Unique Insertion/Extraction Reactions

    Atsushi Sakuda;Koji Ohara;Katsutoshi Fukuda;Koji Nakanishi

  • Direct observation of layered-to-spinel phase transformation in Li2MnO3 and the spinel structure stabilised after the activation process

    Keiji Shimoda;Masatsugu Oishi;Toshiyuki Matsunaga;Miwa Murakami

Frequent Co-Authors

Yoshiharu Uchimoto
Yoshiharu Uchimoto Kyoto University
Zempachi Ogumi
Zempachi Ogumi Kyoto University
Yuki Orikasa
Yuki Orikasa Ritsumeikan University
Eiichiro Matsubara
Eiichiro Matsubara Kyoto University
Katsutoshi Fukuda
Katsutoshi Fukuda Kyoto University
Toshiaki Ohta
Toshiaki Ohta Ritsumeikan University
Ryoji Kanno
Ryoji Kanno Tokyo Institute of Technology
Isao Tanaka
Isao Tanaka Kyoto University
Masaaki Hirayama
Masaaki Hirayama Tokyo Institute of Technology
Shigeto Okada
Shigeto Okada Kyushu University

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