The DOI matches its Crossref record; 5 of the 5 references it cites were found in a registry or an index.
Facile Synthesis of Three‐Dimensional Pt‐TiO 2 Nano‐networks: A Highly Active Catalyst for the Hydrolytic Dehydrogenation of Ammonia–Borane
Open accessAbstract
Three‐dimensional (3D) porous metal and metal oxide nanostructures have received considerable interest because organization of inorganic materials into 3D nanomaterials holds extraordinary properties such as low density, high porosity, and high surface area. Supramolecular self‐assembled peptide nanostructures were exploited as an organic template for catalytic 3D Pt‐TiO 2 nano‐network fabrication. A 3D peptide nanofiber aerogel was conformally coated with TiO 2 by atomic layer deposition (ALD) with angstrom‐level thickness precision. The 3D peptide‐TiO 2 nano‐network was further decorated with highly monodisperse Pt nanoparticles by using ozone‐assisted ALD. The 3D TiO 2 nano‐network decorated with Pt nanoparticles shows superior catalytic activity in hydrolysis of ammonia–borane, generating three equivalents of H 2 .
Overview
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“Moreover, the technological challenge of powders such as poor recoverability and reproducibility significantly restricts the industrial applicability of MOFs.46−50”
From Bimetallic (Co/Ni) MOF-Derived CoNiP Hierarchically Porous Carbon Monolithic Aerogel for the Hydrolysis of Ammonia Borane (2024) · cites this paper as [48]
Citations
Cites
Zhu, C., Du, D., Eychmüller, A., & Lin, Y. (2015) · Chemical Reviews · doi:10.1021/acs.chemrev.5b00255 · Cited by 672
Applications of nano-catalyst in new era
Chaturvedi, S., Dave, P. N., & Shah, N. K. (2012) · Journal of Saudi Chemical Society · doi:10.1016/j.jscs.2011.01.015 · Cited by 534
Noble Metal Aerogels─Synthesis, Characterization, and Application as Electrocatalysts
Liu, W., Herrmann, A.-K., Bigall, N. C., Rodriguez, P., Wen, D., Oezaslan, M., Schmidt, T. J., Gaponik, N., & Eychmüller, A. (2015) · Accounts of Chemical Research · doi:10.1021/ar500237c · Cited by 376
Bimetallic Aerogels: High‐Performance Electrocatalysts for the Oxygen Reduction Reaction
Liu, W., Rodriguez, P., Borchardt, L., Foelske, A., Yuan, J., Herrmann, A., Geiger, D., Zheng, Z., Kaskel, S., Gaponik, N., et al. (2013) · Angewandte Chemie International Edition · doi:10.1002/anie.201303109 · Cited by 277
Wen, D., Herrmann, A.-K., Borchardt, L., Simon, F., Liu, W., Kaskel, S., & Eychmüller, A. (2014) · Journal of the American Chemical Society · doi:10.1021/ja412062e · Cited by 146
Flagged first, then by citations
Research works printed but not linked: 31
- 10.1002/adma.201502078 · DOI
- 10.1021/nn200108s · DOI
- 10.1002/anie.201108575 · DOI · Paper page
- 10.1002/ange.201108575 · DOI
- 10.1002/ange.201303109 · DOI
- 10.1021/acsami.5b10725 · DOI
- 10.1039/b915923c · DOI
- 10.1002/adhm.201300491 · DOI
- 10.1038/srep02306 · DOI
- 10.1039/c2cc36228g · DOI
- 10.1021/cm402221y · DOI
- 10.1021/nl801299z · DOI
- 10.1021/nl101567m · DOI
- 10.1021/nl501205j · DOI
- 10.1038/nature01210 · DOI
- 10.1016/j.apcata.2009.08.031 · DOI
- 10.1021/cr100088b · DOI
- 10.1021/acs.bioconjchem.5b00443 · DOI
- 10.1039/C4OB02217C · DOI
- 10.1021/jp403455a · DOI
- 10.1016/j.susc.2003.08.029 · DOI
- 10.1016/j.electacta.2013.05.002 · DOI
- 10.1021/jp8060043 · DOI
- 10.1021/ja509778y · DOI
- 10.1021/am3019146 · DOI
- W. Chen D. Li Z. Wang G. Qian Z. Sui X. Duan X. Zhou I. Yeboah D. Chen AIChE J.2016 DOI:10.1002/aic.15389. · DOI
- 10.1039/c1nr10201j · DOI
- 10.1021/ja3043905 · DOI
- 10.1039/c3cc48027e · DOI
- 10.1126/science.1212906 · DOI
- 10.1039/c4ee00379a · DOI
Cited by
Sorted by citations
Items 101–170 of 170
Chen, M., Zhang, D.-X., Li, D., Ke, S., Ma, X., Chang, G.-G., Chen, J., & Yang, X.-Y. (2020) · New Journal of Chemistry · doi:10.1039/c9nj05484g · Cited by 19
Wang, C., Wang, H., Wang, Z., Li, X., Chi, Y., Wang, M., Gao, D., & Zhao, Z. (2018) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2018.02.172 · Cited by 22
Deka, J., Budi, C. S., Lin, C.-H., Saikia, D., Yang, Y.-C., & Kao, H. (2018) · Chemistry · doi:10.1002/chem.201802146 · Cited by 18
Zhao, B., Feng, K., Wang, Y., Lv, X.-X., Zheng, H., Ma, Y.-Y., Yan, W.-S., Sun, X.-H., & Zhong, J. (2017) · doi:10.1039/c7cy01742a · Cited by 18
Protection and confinement effect of carbon on Co/CoxOy nano-catalyst for efficient NaBH4 hydrolysis
Ming-bin, L., Guan, S., An, L., Zhang, H., Chen, Y., Shi, J., Fan, Y., & Liu, B. (2022) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2022.04.139 · Cited by 21
Zhao, L., Pei, Q., Yu, Y., Jing, Z., Wang, J., & He, T. (2020) · ChemCatChem · doi:10.1002/cctc.202000715 · Cited by 23
Özkâr, S. (2022) · International Journal of Energy Research · doi:10.1002/er.7616 · Cited by 20
Self-citationCong, W., Li, Q., Bing, L., Wang, F., Han, D., & Wang, G. (2021) · Journal of the Taiwan Institute of Chemical Engineers · doi:10.1016/j.jtice.2021.08.018 · Cited by 18
Khalily, M. A., Patil, B., Yılmaz, E., & Uyar, T. (2018) · Nanoscale Advances · doi:10.1039/c8na00330k · Cited by 28
Self-citationPlasma assisted deposition of single and multistacked TiO2 hierarchical nanotube photoanodes.
Filippin, A. N., Sanchez-Valencia, J., Idígoras, J., Rojas, T. C., Barranco, Á., Anta, J., & Borrás, A. (2017) · Nanoscale · doi:10.1039/c7nr00923b · Cited by 16
Ammonia Borane and Its Applications in the Advanced Energy Technology
Li, H.-J., Yan, Y.-F., Feng, S., Chen, Y.-R., & Fan, H. (2021) · doi:10.1115/1.4049929 · Cited by 15
Li, H.-N., Zhu, M.-Y., Chen, W., Xu, L., & Wang, K. (2017) · Journal of Colloid and Interface Science · doi:10.1016/j.jcis.2017.07.103 · Cited by 15
Ni, Y., Han, Z., Li, W.-J., Tan, J., Chai, Y.-C., Wu, G.-J., & Li, L.-D. (2025) · Chemical Engineering Journal · doi:10.1016/j.cej.2025.167130 · Cited by 14
Akbayrak, S., Çakmak, G., Öztürk, T., & Özkâr, S. (2024) · Journal of Alloys and Compounds · doi:10.1016/j.jallcom.2024.175199 · Cited by 15
Self-citationAdvances in Manufacturing Composite Carbon Nanofiber-Based Aerogels
Gan, Y., & Gan, J. B. (2020) · Journal of Composites Science · doi:10.3390/jcs4020073 · Cited by 14
Li, X., Liu, Y., Xu, P., Du, X., Mi, G., Mao, B., & Zhang, J. (2022) · Energy & Fuels · doi:10.1021/acs.energyfuels.1c04255 · Cited by 16
H2 Evolution Upon Hydrolysis of Ammonia-Borane Catalyzed by Porphyrin Stabilized Nanocatalysts
Zhang, N.-N., Liu, G.-J., Sun, Y.-L., Wang, Y.-L., Yan, J.-Y., & Liu, X. (2021) · Catalysis Letters · doi:10.1007/s10562-020-03501-8 · Cited by 13
Li, H., Wen, P.-C., Hoxie, A., Dun, C., Adhikari, S., Li, Q., Lu, C., Itanze, D. S., Jiang, L., Carroll, D., et al. (2018) · ACS Applied Materials and Interfaces · doi:10.1021/acsami.7b19229 · Cited by 13
Akbayrak, S., & Özkar, S. (2025) · Journal of Alloys and Compounds · doi:10.1016/j.jallcom.2025.179220 · Cited by 12
Self-citationHuang, L., Liu, X.-R., Wu, H., Wang, X.-X., Wu, H.-M., Li, R.-G., Shi, L.-Y., & Li, C. (2020) · doi:10.1039/c9ta14181b · Cited by 12
Self-Supported Pt@Ni2P for Controllable Hydrogen Release from Ammonia-Borane Hydrolysis
Asim, M., Maryam, B., Liu, X.-H., Pan, L., Shi, C.-X., & Zou, J.-J. (2023) · Industrial & Engineering Chemistry Research · doi:10.1021/acs.iecr.3c01055 · Cited by 11
Cong, W., Zhang, H., Bing, L.-C., Wang, F., Han, D.-Z., & Wang, G.-J. (2023) · Journal of Alloys and Compounds · doi:10.1016/j.jallcom.2023.170314 · Cited by 11
Kaur, A., Bajaj, B., & Sud, D. (2022) · Journal of the Iranian Chemical Society · doi:10.1007/s13738-022-02616-6 · Cited by 11
Jiang, R., Wang, W., Zheng, X., Li, Q., Xu, Z.-M., & Peng, J. (2020) · doi:10.1016/j.ijhydene.2020.11.086 · Cited by 11
Ranjith, K., Celebioglu, A., & Uyar, T. (2018) · Nanotechnology · doi:10.1088/1361-6528/aab9da · Cited by 11
Zhang, J., Xu, H., Gan, J., Xing, S., Zhao, X., & Qin, Y. (2026) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2026.126623 · Cited by 7
On downscaling of the tantalum oxides from three to zero dimensions
Jabeen, A., Alkhedher, M., Majid, A., & al Hassan, N. (2022) · Materials Science in Semiconductor Processing · doi:10.1016/j.mssp.2022.107014 · Cited by 10
Xiong, Y.-L., Yang, L., Xiao, P., & Yang, Y.-N. (2018) · Journal of Materials Science · doi:10.1007/s10853-018-2079-9 · Cited by 10
Co@SiO2/C catalyst shielded by hierarchical shell for robust hydrogen production
Sun, L., Liu, M., Zhang, T., Huang, Y., Song, H., Yang, J., Dou, J., 李大成, Gao, X., Zhang, Q., et al. (2023) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2023.123537 · Cited by 14
Xiang, J., Sun, Z., Chen, F., Zhang, H., Song, Y., We, H., Liang, H., Hou, Y., Song, Y., Liu, P., et al. (2025) · Journal of Alloys and Compounds · doi:10.1016/j.jallcom.2025.181652 · Cited by 11
Engineering Ru atomic structures toward enhanced kinetics of hydrogen generation
Fu, W., Wang, Q., Chen, W., Qian, G., Zhang, J., Chen, D., Yuan, W., Zhou, X., & Duan, X. (2021) · Chemical Engineering Science · doi:10.1016/j.ces.2021.116507 · Cited by 11
Akbayrak, S., & Özkar, S. (2017) · doi:10.1002/9781119283676.ch5 · Cited by 9
Self-citationWei, Y.-W., Yang, G., Xu, X.-X., Liu, Y.-Y., Li, B.-J., Wang, Y.-Z., & Zhao, Y.-X. (2023) · RSC Advances · doi:10.1039/d3ra00358b · Cited by 8
Fang, C., Liu, L., Weng, J.-N., Zhang, S.-Y., Zhang, X., Ren, Z., Shen, Y., Meng, F.-C., Zheng, B., Li, S., et al. (2020) · Angewandte Chemie · doi:10.1002/ange.202011866 · Cited by 8
Low-temperature synthesis of crystalline vanadium oxide films using oxygen plasmas
Mohammad, A., Joshi, K. D., Rana, D.-S., Ilhom, S., Wells, B., Willis, B., Sinković, B., Okyay, A., & Biyikli, N. (2023) · Journal of Vacuum Science & Technology A · doi:10.1116/6.0002383 · Cited by 7
Self-citationChen, W.-Y., Fu, W.-Z., Chen, B., Peng, C., Qian, G., Chen, D., Duan, X.-Z., & Zhou, X. (2020) · doi:10.1016/j.jcat.2020.03.023 · Cited by 7
Khalily, M. A., Patil, B., Yılmaz, E., & Uyar, T. (2019) · ChemNanoMat · doi:10.1002/cnma.201900483 · Cited by 9
Self-citationYue, Z., Cheng, Y., Jiang, Q., Bai, X., Fang, X., Zhao, X., Yao, Y., Dong, D., Che, Y., & Chang, G. (2024) · Industrial & Engineering Chemistry Research · doi:10.1021/acs.iecr.4c02523 · Cited by 6
Xiong, M., Li, Y., Sun, L., Hu, Q., Lv, Z., Xing, S.-F., Yun, H., Zhang, S.-C., & Gao, Z. (2025) · Surfaces and Interfaces · doi:10.1016/j.surfin.2025.106242 · Cited by 6
Alharbi, A. A., Wills, C., Dixon, C., Arca, E., Chamberlain, T. W., Griffiths, A., Collins, S. M., Wu, K., Yan, H., Bourne, R. A., et al. (2024) · Catalysis Letters · doi:10.1007/s10562-024-04725-8 · Cited by 9
“…the same trend in rates in that the hydrolysis of AB is typically much faster than DMAB with both ruthenium and platinum nanoparticles [97, 105, 212– Finally, as NaBH 4 is also a promising hydrogen storage material, the efficacy of 2a and 2b as catalysts for the hydrolytic liberation of…”
Tercan, M. (2023) · ChemistrySelect · doi:10.1002/slct.202302035 · Cited by 6
One-pot synthesis of VO x /Al 2 O 3 as efficient catalysts for propane dehydrogenation
Wang, G.-J., Xu, H., Lu, K., Ding, Z., & Bing, L.-C. (2020) · Turkish journal of chemistry · doi:10.3906/kim-1907-53 · Cited by 6
“Chu and Luo reported PtSn/Mg-SBA-15 catalysts that achieved high catalytic performance for PDH [22].”
BackgroundMohammad, A., Ilhom, S., Shukla, D., & Biyikli, N. (2022) · Journal of Vacuum Science & Technology A · doi:10.1116/6.0001772 · Cited by 5
Self-citationJu, Y., Cho, T., Lee, K., Kim, J., Yoon, C. W., & Kim, J. (2022) · International Journal of Energy Research · doi:10.1002/er.7846 · Cited by 5
“1 molH2molPt 1 min 1 was lower than that obtained using Pt-based catalysts (including Pt/CNT and Pt@MIL-101) reported previously for AB hydrolysis, which was most likely due to the favorable support effects of CNT and MIL-101 in the previous Pt-based catalysts.(21,24,25) This also suggests that the active supports as…”
MethodShang, Y.-P., Feng, K., Wang, Y., Sun, X.-H., & Zhong, J. (2019) · RSC Advances · doi:10.1039/c9ra01743g · Cited by 5
Zhang, H., Niu, Q., Mou, Y., Bian, Z., Zhang, T., Chu, C., Han, D.-Z., Wang, F., Wang, G.-J., & Bing, L.-C. (2025) · Journal of Environmental Chemical Engineering · doi:10.1016/j.jece.2025.115936 · Cited by 4
Demirci, S., Polat, O., & Sahiner, N. (2025) · Micromachines · doi:10.3390/mi16020172 · Cited by 4
Gazil, O., Rault, L., Iglicki, D., Collière, V., Karacaoglan, G., Poinsot, D., Bouzid, M., Hierso, J.-C., Kahn, M. L., Virgilio, N., et al. (2024) · Langmuir · doi:10.1021/acs.langmuir.4c01307 · Cited by 4
Wang, H., Zhou, T., Xu, S., Deng, K., Yu, H., Xu, Y. P., Li, X., Wang, Z., & Wang, L. (2022) · Nanotechnology · doi:10.1088/1361-6528/ad18ea · Cited by 4
Kaur, A., & Sud, D. (2023) · International Journal of Environmental Science and Technology · doi:10.1007/s13762-023-05358-x · Cited by 4
“The bottom-up synthetic approach involves the self-assembly of small atoms/molecules by employing physical or chemical forces (Khalily et al. 2016; Roy et al. 2015).”
Wang, D., Hu, Y., Li, Y., Jia, X., Fang, Y., Zhang, Z., & Zhang, X. (2023) · ACS Omega · doi:10.1021/acsomega.2c06432 · Cited by 7
Özkâr, S., MacHale, L. T., & Finke, R. G. (2023) · The Journal of Physical Chemistry C · doi:10.1021/acs.jpcc.3c04417 · Cited by 3
Self-citationTunable hydrogen release from amine-boranes via their insertion into functional polystyrenes.
Ledoux, A., Brunet, J., Raynaud, J., & Lacôte, E. (2019) · Angewandte Chemie · doi:10.1002/anie.201904898 · Cited by 3
Liang, S., Liu, W., Zhu, J., Song, D., Cao, D., Zhang, Y., & Yu, J. (2026) · Coordination Chemistry Reviews · doi:10.1016/j.ccr.2026.218017 · Cited by 5
Yoon, S. J., Lee, S. J., & Jeon, I. (2025) · Journal of Power Sources · doi:10.1016/j.jpowsour.2025.237915 · Cited by 4
Majid, A., & Bibi, M. (2018) · doi:10.1007/978-3-319-68753-7_2 · Cited by 3
TiO2-Engineered MOFs Activate Electron-Rich Ni Sites for Efficient and Durable Hydrogen Production.
Liang, T., Gao, Z., Yao, Q., Wang, K., Feng, G., & Lu, Z.-H. (2026) · ChemSusChem · doi:10.1002/cssc.70524 · Cited by 2
Dias, G. D. C., Barreto, E. F. L., Ferreira, M., de Souza, N. C. S., de Urzedo, A. P. F. M., Silva, T. A., Bernardes-Silva, A., de Lima, G. M., Astruc, D., & Moreira, R. (2026) · Energy & Fuels · doi:10.1021/acs.energyfuels.5c05836 · Cited by 2
İzgi, M. S., Onat, E., Enisoğlu, M., Çelik, F., Karabulut, E., Şahi̇n, Ö., & Demirci, S. (2025) · Journal of Molecular Structure · doi:10.1016/j.molstruc.2025.144871 · Cited by 2
Mohammad, A., Joshi, K. D., Rana, D., Ilhom, S., Wells, B., Sinkovic, B., Okyay, A., & Biyikli, N. (2024) · Journal of Vacuum Science & Technology A · doi:10.1116/6.0002988 · Cited by 2
Self-citationGhosh, A., Banerjee, S., Debnath, T., & Das, A. K. (2022) · Physical Chemistry, Chemical Physics - PCCP · doi:10.1039/d1cp05770g · Cited by 2
Dong, G.-N., Liu, X., Liang, J.-Y., Wang, X.-L., Geng, Y., Luo, L., Wang, J.-L., & Ma, M. (2025) · Electrochimica Acta · doi:10.1016/j.electacta.2025.147783 · Cited by 1
Da, Y.-Q., Ma, X.-D., He, T.-S., Yang, R.-H., Li, Y., Yang, Q., & Du, J. (2025) · Journal of Building Engineering · doi:10.1016/j.jobe.2025.111973 · Cited by 1
Li, R., Zuo, Y., Xu, L.-C., Hua, J., Feng, J., Xu, L.-X., Ye, M., & Chao, W. (2024) · Journal of Fuel Chemistry and Technology · doi:10.1016/s1872-5813(24)60462-7 · Cited by 1
Xu, K., & Wang, Q. (2022) · Nanotechnology · doi:10.1088/1361-6528/ac5541 · Cited by 1
“For example, Khalily et al reported that the Pt – TiO 2 aerogels show high performance in H 2 generation via ammonia-borane hydrolysis due to the metal-semiconductor heterojunction enhanced charge separation and the rich pores-enabled rapid diffusion of reactants in the aerogels [ 15 ] .”
Preparation and High Temperature Inorganic Transformation of Flexible Silicone Aerogels
Luo, Y., Shuhai, X. I. A., Niu, B., ZHANG, Y., & Long, D. (2022) · Journal of Inorganic Materials · doi:10.15541/jim20220129 · Cited by 2
Pt-Vulcan Nanocomposites: Efficient Catalyst for the Methanolysis of Ammonia-Borane
Demirci, E. Ş., Çakmak, K., & Sevim, M. (2026) · Catalysts · doi:10.3390/catal16080726
İzgi, M. S., Şahi̇n, Ö., Onat, E., Enisoğlu, M., Çelik, F., & Karabulut, E. (2026) · ChemNanoMat · doi:10.1002/cnma.70334
Li, W., Yi, W.-J., Liao, R., Chen, H., & Yue, X. (2025) · Sustainable Energy & Fuels · doi:10.1039/d5se01247c
Design of amphiphilic peptide nanofibers
Guler, M. O. (2020) · Elsevier eBooks · doi:10.1016/b978-0-08-102850-6.00008-5
Self-citation
Metadata
- Authors
- Khalily, M. A., Eren, H., Akbayrak, S., Susapto, H. H., Biyikli, N., Özkar, S., & Guler, M. O.
- Affiliations
- Bilkent University (TR)
- Middle East Technical University (TR)
- Institute of Materials Science and Nanotechnology National Nanotechnology Research Center (UNAM) Bilkent University Ankara 06800 Turkey
- Department of Chemistry Middle East Technical University Ankara 06800 Turkey
- Corresponding author
- Guler, Mustafa O.
- Venue
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Published
- 2016-09-06
- Volume
- 55
- Issue
- 40
- Pages
- 12257-12261
- ISSN
- 1433-7851 (ISSN-L)
- 1521-3773
- OpenAlex
- W2511519823
- Cited by
- 181
- References
- 36
- Citations by year
- 2026: 8 · 2025: 12 · 2024: 11 · 2023: 17 · 2022: 15 · 2021: 22 · 2020: 21 · 2019: 25 · 2018: 23 · 2017: 25 · 2016: 2
- FWCI
- 11.14
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- Locations
- Angewandte Chemie International Edition (publishedVersion)
- PubMed (publishedVersion)
- Bilkent University Institutional Repository (Bilkent University) (submittedVersion)
- OpenMETU (Middle East Technical University) (submittedVersion, cc-by-nc-nd)
- Funders
- TUBITAK (112M578)
- Turkish Academy of Sciences
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Hydrogen Storage and Materials
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Organic Frameworks: Synthesis and Applications
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Keywords
- three-dimensional nanostructures, ammonia borane hydrolysis, dehydrogenation, hydrogen storage, peptide nanofibers, atomic layer deposition, platinum nanoparticles, supramolecular self-assembly, metal oxide nanostructures
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review