---
_id: '62810'
abstract:
- lang: eng
  text: Cobalt iron containing layered double hydroxides (LDHs) and spinels are promising
    catalysts for the electrochemical oxygen evolution reaction (OER). Towards development
    of better performing catalysts, the precise tuning of mesostructural features
    such as pore size is desirable, but often hard to achieve. Herein, a computer‐controlled
    microemulsion‐assisted co‐precipitation (MACP) method at constant pH is established
    and compared to conventional co‐precipitation. With MACP, the particle growth
    is limited and through variation of the constant pH during synthesis the pore
    size of the as‐prepared catalysts is controlled, generating materials for the
    systematic investigation of confinement effects during OER. At a threshold pore
    size, overpotential increased significantly. Electrochemical impedance spectroscopy
    (EIS) indicated a change in OER mechanism, involving the oxygen release step.
    It is assumed that in smaller pores the critical radius for gas bubble formation
    is not met and therefore a smaller charge‐transfer resistance is observed for
    medium frequencies.
article_number: e202202015
article_type: original
author:
- first_name: Anna
  full_name: Rabe, Anna
  last_name: Rabe
- first_name: Maximilian
  full_name: Jaugstetter, Maximilian
  last_name: Jaugstetter
- first_name: Felix
  full_name: Hiege, Felix
  last_name: Hiege
- first_name: Nicolas
  full_name: Cosanne, Nicolas
  last_name: Cosanne
- first_name: Klaus Friedel
  full_name: Ortega, Klaus Friedel
  last_name: Ortega
- first_name: Julia
  full_name: Linnemann, Julia
  id: '116779'
  last_name: Linnemann
  orcid: 0000-0001-6883-5424
- first_name: Kristina
  full_name: Tschulik, Kristina
  last_name: Tschulik
- first_name: Malte
  full_name: Behrens, Malte
  last_name: Behrens
citation:
  ama: Rabe A, Jaugstetter M, Hiege F, et al. Tailoring Pore Size and Catalytic Activity
    in Cobalt Iron Layered Double Hydroxides and Spinels by Microemulsion‐Assisted
    pH‐Controlled Co‐Precipitation. <i>ChemSusChem</i>. 2023;16(10). doi:<a href="https://doi.org/10.1002/cssc.202202015">10.1002/cssc.202202015</a>
  apa: Rabe, A., Jaugstetter, M., Hiege, F., Cosanne, N., Ortega, K. F., Linnemann,
    J., Tschulik, K., &#38; Behrens, M. (2023). Tailoring Pore Size and Catalytic
    Activity in Cobalt Iron Layered Double Hydroxides and Spinels by Microemulsion‐Assisted
    pH‐Controlled Co‐Precipitation. <i>ChemSusChem</i>, <i>16</i>(10), Article e202202015.
    <a href="https://doi.org/10.1002/cssc.202202015">https://doi.org/10.1002/cssc.202202015</a>
  bibtex: '@article{Rabe_Jaugstetter_Hiege_Cosanne_Ortega_Linnemann_Tschulik_Behrens_2023,
    title={Tailoring Pore Size and Catalytic Activity in Cobalt Iron Layered Double
    Hydroxides and Spinels by Microemulsion‐Assisted pH‐Controlled Co‐Precipitation},
    volume={16}, DOI={<a href="https://doi.org/10.1002/cssc.202202015">10.1002/cssc.202202015</a>},
    number={10e202202015}, journal={ChemSusChem}, publisher={Wiley}, author={Rabe,
    Anna and Jaugstetter, Maximilian and Hiege, Felix and Cosanne, Nicolas and Ortega,
    Klaus Friedel and Linnemann, Julia and Tschulik, Kristina and Behrens, Malte},
    year={2023} }'
  chicago: Rabe, Anna, Maximilian Jaugstetter, Felix Hiege, Nicolas Cosanne, Klaus
    Friedel Ortega, Julia Linnemann, Kristina Tschulik, and Malte Behrens. “Tailoring
    Pore Size and Catalytic Activity in Cobalt Iron Layered Double Hydroxides and
    Spinels by Microemulsion‐Assisted PH‐Controlled Co‐Precipitation.” <i>ChemSusChem</i>
    16, no. 10 (2023). <a href="https://doi.org/10.1002/cssc.202202015">https://doi.org/10.1002/cssc.202202015</a>.
  ieee: 'A. Rabe <i>et al.</i>, “Tailoring Pore Size and Catalytic Activity in Cobalt
    Iron Layered Double Hydroxides and Spinels by Microemulsion‐Assisted pH‐Controlled
    Co‐Precipitation,” <i>ChemSusChem</i>, vol. 16, no. 10, Art. no. e202202015, 2023,
    doi: <a href="https://doi.org/10.1002/cssc.202202015">10.1002/cssc.202202015</a>.'
  mla: Rabe, Anna, et al. “Tailoring Pore Size and Catalytic Activity in Cobalt Iron
    Layered Double Hydroxides and Spinels by Microemulsion‐Assisted PH‐Controlled
    Co‐Precipitation.” <i>ChemSusChem</i>, vol. 16, no. 10, e202202015, Wiley, 2023,
    doi:<a href="https://doi.org/10.1002/cssc.202202015">10.1002/cssc.202202015</a>.
  short: A. Rabe, M. Jaugstetter, F. Hiege, N. Cosanne, K.F. Ortega, J. Linnemann,
    K. Tschulik, M. Behrens, ChemSusChem 16 (2023).
date_created: 2025-12-03T15:51:54Z
date_updated: 2025-12-03T16:28:26Z
department:
- _id: '985'
doi: 10.1002/cssc.202202015
extern: '1'
intvolume: '        16'
issue: '10'
keyword:
- electrocatalysis
- oxygen evolution reaction
- cobalt spinel
- cobalt hydroxide
- LDH
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
publication: ChemSusChem
publication_identifier:
  issn:
  - 1864-5631
  - 1864-564X
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: Tailoring Pore Size and Catalytic Activity in Cobalt Iron Layered Double Hydroxides
  and Spinels by Microemulsion‐Assisted pH‐Controlled Co‐Precipitation
type: journal_article
user_id: '116779'
volume: 16
year: '2023'
...
---
_id: '62808'
abstract:
- lang: eng
  text: Conventional alkaline solutions used for capacitive performance of electrodeposited
    cobalt hydroxides have a number of disadvantages as they are corrosive, environmentally
    unfriendly and provide a small working potential range. In this study, the capacitive
    properties of electrodeposited cobalt hydroxide/oxide were investigated in 1 M
    Na2SO4 solution with pH 5.5 by means of cyclic voltammetry, galvanostatic charging/discharging
    experiments and electrochemical impedance spectroscopy. The capacitance of the
    cobalt hydroxide/oxide was demonstrated to have high values of 141 F g−1 at scan
    rate 8 mV s−1 in this 1 M Na2SO4 solution. The anodic potential range is extended
    by 0.8–1.3 V vs. Ag/AgCl. A good cyclic stability and reversibility were observed.
article_type: original
author:
- first_name: Fedor S.
  full_name: Fedorov, Fedor S.
  last_name: Fedorov
- first_name: Julia
  full_name: Linnemann, Julia
  id: '116779'
  last_name: Linnemann
  orcid: 0000-0001-6883-5424
- first_name: Kristina
  full_name: Tschulik, Kristina
  last_name: Tschulik
- first_name: Lars
  full_name: Giebeler, Lars
  last_name: Giebeler
- first_name: Margitta
  full_name: Uhlemann, Margitta
  last_name: Uhlemann
- first_name: Annett
  full_name: Gebert, Annett
  last_name: Gebert
citation:
  ama: Fedorov FS, Linnemann J, Tschulik K, Giebeler L, Uhlemann M, Gebert A. Capacitance
    performance of cobalt hydroxide-based capacitors with utilization of near-neutral
    electrolytes. <i>Electrochimica Acta</i>. 2012;90:166-170. doi:<a href="https://doi.org/10.1016/j.electacta.2012.11.123">10.1016/j.electacta.2012.11.123</a>
  apa: Fedorov, F. S., Linnemann, J., Tschulik, K., Giebeler, L., Uhlemann, M., &#38;
    Gebert, A. (2012). Capacitance performance of cobalt hydroxide-based capacitors
    with utilization of near-neutral electrolytes. <i>Electrochimica Acta</i>, <i>90</i>,
    166–170. <a href="https://doi.org/10.1016/j.electacta.2012.11.123">https://doi.org/10.1016/j.electacta.2012.11.123</a>
  bibtex: '@article{Fedorov_Linnemann_Tschulik_Giebeler_Uhlemann_Gebert_2012, title={Capacitance
    performance of cobalt hydroxide-based capacitors with utilization of near-neutral
    electrolytes}, volume={90}, DOI={<a href="https://doi.org/10.1016/j.electacta.2012.11.123">10.1016/j.electacta.2012.11.123</a>},
    journal={Electrochimica Acta}, publisher={Elsevier BV}, author={Fedorov, Fedor
    S. and Linnemann, Julia and Tschulik, Kristina and Giebeler, Lars and Uhlemann,
    Margitta and Gebert, Annett}, year={2012}, pages={166–170} }'
  chicago: 'Fedorov, Fedor S., Julia Linnemann, Kristina Tschulik, Lars Giebeler,
    Margitta Uhlemann, and Annett Gebert. “Capacitance Performance of Cobalt Hydroxide-Based
    Capacitors with Utilization of near-Neutral Electrolytes.” <i>Electrochimica Acta</i>
    90 (2012): 166–70. <a href="https://doi.org/10.1016/j.electacta.2012.11.123">https://doi.org/10.1016/j.electacta.2012.11.123</a>.'
  ieee: 'F. S. Fedorov, J. Linnemann, K. Tschulik, L. Giebeler, M. Uhlemann, and A.
    Gebert, “Capacitance performance of cobalt hydroxide-based capacitors with utilization
    of near-neutral electrolytes,” <i>Electrochimica Acta</i>, vol. 90, pp. 166–170,
    2012, doi: <a href="https://doi.org/10.1016/j.electacta.2012.11.123">10.1016/j.electacta.2012.11.123</a>.'
  mla: Fedorov, Fedor S., et al. “Capacitance Performance of Cobalt Hydroxide-Based
    Capacitors with Utilization of near-Neutral Electrolytes.” <i>Electrochimica Acta</i>,
    vol. 90, Elsevier BV, 2012, pp. 166–70, doi:<a href="https://doi.org/10.1016/j.electacta.2012.11.123">10.1016/j.electacta.2012.11.123</a>.
  short: F.S. Fedorov, J. Linnemann, K. Tschulik, L. Giebeler, M. Uhlemann, A. Gebert,
    Electrochimica Acta 90 (2012) 166–170.
date_created: 2025-12-03T15:47:09Z
date_updated: 2025-12-03T16:35:20Z
department:
- _id: '985'
doi: 10.1016/j.electacta.2012.11.123
extern: '1'
intvolume: '        90'
keyword:
- electrodeposition
- cobalt hydroxide
- supercapacitors
language:
- iso: eng
page: 166-170
publication: Electrochimica Acta
publication_identifier:
  issn:
  - 0013-4686
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Capacitance performance of cobalt hydroxide-based capacitors with utilization
  of near-neutral electrolytes
type: journal_article
user_id: '116779'
volume: 90
year: '2012'
...