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Electronic Supplementary Material Atomically ultrathin RhCo alloy nanosheets aggregates for efficient water electrolysis in broad pH range Yue Zhao,‡ a Juan Bai,‡ a Xin-Ru Wu, a Pei Chen, a Pu-Jun Jin, a Hong-Chang Yao, b and Yu Chen *a a a. Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an 710119, PR China b College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China * Corresponding author E-mail: [email protected] (Y. Chen). Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2019

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Page 1: Electronic Supplementary Material water electrolysis in ... · Fig. S3 CV curves of RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 50 mV s−1. Fig. S4 CV curves of

Electronic Supplementary Material

Atomically ultrathin RhCo alloy nanosheets aggregates for efficient

water electrolysis in broad pH range

Yue Zhao,‡a Juan Bai,‡a Xin-Ru Wu,a Pei Chen,a Pu-Jun Jin,a Hong-Chang Yao,b and

Yu Chen*a

a a. Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory

of Applied Surface and Colloid Chemistry (Ministry of Education), Shaanxi Key

Laboratory for Advanced Energy Devices, School of Materials Science and

Engineering, Shaanxi Normal University, Xi’an 710119, PR China

b College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou

450001, PR China

* Corresponding author

E-mail: [email protected] (Y. Chen).

Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A.This journal is © The Royal Society of Chemistry 2019

Page 2: Electronic Supplementary Material water electrolysis in ... · Fig. S3 CV curves of RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 50 mV s−1. Fig. S4 CV curves of

Fig. S1 EDX spectra of RhCo-ANAs obtained at (A) 160 oC, (B) 200 oC, and 240 oC, respectively.

Fig. S2 XPS survey spectrum of RhCo-ANAs.

0.0 0.2 0.4 0.6 0.8 1.0 1.2-20

-10

0

10

Pt-NPs RhCo-ANAs

j mA

/cm

-2

Potential / V(vs.RHE)Fig. S3 CV curves of RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 50 mV s−1.

Fig. S4 CV curves of (A) RhCo-ANAs and (B) Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 50 mV s−1 before and after 5 000 scan cycles.

Page 3: Electronic Supplementary Material water electrolysis in ... · Fig. S3 CV curves of RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 50 mV s−1. Fig. S4 CV curves of

Fig. S5 SEM image of RhCo-ANAs after 5 000 scan cycles.

Fig. S6 (A) HER polarization curves of RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 5 mV s−1. (B) Tafel plots of the HER at RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution.

Fig. S7 (A) HER polarization curves of RhCo-ANAs and Pt-NPs in Ar-saturated 1.0 M KOH solution at 5 mV s−1. (B) Tafel plots of HER at RhCo-ANAs and Pt-NPs in Ar-saturated 1.0 M KOH solution.

Fig. S8 (A) OER polarization curves of RhCo-ANAs and RuO2-NPs in Ar-saturated 0.5 M H2SO4 solution at 5 mV s−1 and (B) Tafel plots of RhCo-ANAs and RuO2-NPs.

Page 4: Electronic Supplementary Material water electrolysis in ... · Fig. S3 CV curves of RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 50 mV s−1. Fig. S4 CV curves of

Fig. S9 (A) OER polarization curves of RhCo-ANAs and RuO2-NPs in Ar-saturated 1.0 M KOH solution at 5 mV s−1 and (B) Tafel plots of RhCo-ANAs and RuO2-NPs.

Fig. S10. (A) SEM and (B) TEM images of spherical RhCo nanoparticles. (C) HER polarization curves of RhCo-ANAs and spherical RhCo nanoparticles in Ar-saturated 1.0 M PBS solution at 5 mV s−1. (D) OER polarization curves of RhCo-ANAs and spherical RhCo nanoparticles in Ar-saturated 1.0 M PBS solution at 5 mV s−1. Herein, spherical RhCo nanoparticles are obtained by using RhCl3 and CoCl2 as reaction precursors and HCHO as reducing agent at 240 oC for 6 h.

Page 5: Electronic Supplementary Material water electrolysis in ... · Fig. S3 CV curves of RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 50 mV s−1. Fig. S4 CV curves of

Fig. S11 (A) SEM and (B) TEM images of Rh-ANAs. (C) HER polarization curves of RhCo-ANAs and monometallic Rh-ANAs in Ar-saturated 1.0 M PBS solution at 5 mV s−1. (D) OER polarization curves of RhCo-ANAs and monometallic Rh-ANAs in Ar-saturated 1.0 M PBS solution at 5 mV s−1. Herein, Rh-ANAs was obtained by selecting reaction temperature at 160 oC (Fig. S1A)

Fig. S12 EDX spectrum of RhCo-ANAs/CF.

Fig. S13 SEM images of RhCo-ANAs/CF after the stability test (A) SEM images of RhCo-ANAs/CF, (B) magnified SEM images of RhCo-ANAs/CF.

Page 6: Electronic Supplementary Material water electrolysis in ... · Fig. S3 CV curves of RhCo-ANAs and Pt-NPs in Ar-saturated 0.5 M H2SO4 solution at 50 mV s−1. Fig. S4 CV curves of

6000 12000 18000 24000 3000010

20

30

50th

j mA

cm

-2

Time / s

11th

Fig. S14 Chronoamperometric curves of symmetric RhCo-ANAs/CF||RhCo-ANAs/CF electrolyzer in 1.0 M PBS solution in periodically switching cathode and anode mode. Applied voltage: 1.65 V; Switching time interval: 10 min.

Fig. S15 The photograph of (A) sponge scouring pad and (B) CF with flexible property.


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