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(a) Schematic illustration of water splitting powered by various green energy systems. (b) Schematic illustration, J-V curve and LSV curve of solar powered AWE system^[85]. Reproduced with permission of Ref. 85, copyright Wiley. (c) Comparison in the STH efficiency of solar powered AWE system. (d) Illustration of TE powered AWE system^[95]. Reproduced with permission of Ref. 95, copyright Elsevier. (e) Schematic of pyroelectric as an external source for AWE system^[96]. Reproduced with permission of Ref. 96, copyright Elsevier. (f) Schematic diagram of CRF-TENG wind energy harvester driven self-powered AWE system^[97]. Reproduced with permission of Ref. 97, copyright Elsevier. (g) Schematic illustration of self-powered AWE system using a water-flow-driven TENG^[98]. Reproduced with permission of Ref. 98, copyright Wiley. (color on line)
(a) Schematic illustration of reducing the voltage and improving the economic benefits for AWE. Electrochemical hydrogen evolution coupled with 5-hydroxymethylfurfural oxidation over (b) E-CoAl-LDH-NSA^[57] and (c) CoNiP-NIE^[80]. Reproduced with permissions of Refs. 57 and 80, copyright Elsevier. Electrochemical hydrogen evolution coupled with benzyl alcohol oxidation over (d) CNs@CoPt^[72] and (e) Au/CoOOH^[81]. Reproduced with permission of Ref. 72, copyright Elsevier. Reproduced with permission of Ref. 81, copyright Springer Nature Ltd. (f) Electrochemical hydrogen evolution coupled with lignin derivatives oxidation over MnCoOOH^[82]. Reproduced with permission of Ref. 82, copyright Wiley. (color on line)
(a) Graph showing the contributions to cell voltage from the components of the cell resistance. (b) Schematic illustration of various current collectors. (c) Various strategies to boost performance via structure design. (d) Schematic illustration of bubbles releasing at the surface of traditional coating electrode and integrated electrode. The configuration of (e) traditional AWE cell, (f) zero-gap AWE cell and (g) AWE cell with GDL. (color on line)
(a) Timeline of recent developments for water electrolysis. (b) Illustration and HER performance of (Ni, Fe)S₂@MoS₂^[53]. Reproduced with permission of Ref. 53, copyright Elsevier. (c) Illustration and HER performance of FeCoP^[54]. Reproduced with permission of Ref. 54, copyright Elsevier. (d) Schematic presentation of LDHs-derived materials. (color on line)
Summary of AWE performance from recently reported work
Schematic diagrams of (a) AWE, (b) PEMWE and (c) SOWE. Comprehensive comparisons of AWE, PEMWE and SOWE in terms of (d) hydrogen production rate, (e) current density, (f) efficiency, (g) lifetime, (h) cell temperature, (i) energy consumption, (j) cold start-up time and (k) investment costs. (color on line)
(a) A schematic illustration of the hydrogen value chain from supply to end-use. (b) Statistics on the numbers of publications related to water electrolysis in the last few decades. (c) The cost and CO₂ emission values for various hydrogen production techniques. (d) Comparison of stability for the reported hydrogen evolution reaction (HER) electrocatalysts in acid (purple), neutral (green) and alkaline (orange) media. (color on line)
Electrochemical HER performance in 1.0 mol·L^-1 KOH. (a) LSV curves, (b) Tafel plots, (c) histograms of overpotential and Tafel slope, (d) Nyquist plots and (e) current density difference plots against scan rate of the CoRu@N-CNTs, CoRu@NC, Ru@NC, Co@N-CNTs and the commercial benchmark 20% Pt/C. (f) Long-term chronoamperometric test of the CoRu@N-CNTs, the inset showing the LSV curves of the CoRu@N-CNTs before (solid) and after (dashed) 2000 CV cycles. (g) Performance comparison of the CoRu@N-CNTs with the recently-reported Co/Ru-based HER electrocatalysts in 1.0 mol·L^-1 KOH.
High-resolution XPS spectra for (a) Co 2p of the CoRu@N-CNTs, CoRu@NC and Co@N-CNTs; (b) Ru 3p of the CoRu@N-CNTs, CoRu@NC and Ru@NC; (c) N 1s of the CoRu@N-CNTs, CoRu@NC, Ru@NC and Co@N-CNTs.
(a) XRD patterns and (b) Raman spectra of the CoRu@N-CNTs, CoRu@NC, Ru@NC and Co@N-CNTs.
Structure characterization of CoRu@N-CNTs. (a) SEM, (b) TEM, (c), (d) and (e) HRTEM images and (f) the corresponding elemental mapping images of Co, Ru, O, C and N for CoRu@N-CNTs. Scale bars in (a) 1 μm, (b) 200 nm, (c) 10 nm, (d) 2 nm, (e) 2 nm and (f) 100 nm.
Schematic illustration for the synthesis process of CoRu@N-CNTs.
The volumetric strain profiles of positive and negative electrodes surfaces
The von Mises stresses (A) and available lithium ions concentrations (B) of positive and negative electrodes upon different cycles under 3C rate.
DIS at different moments under 5C rate. (A) Radial component of induced stress (B) Tangential component (C) Von Mises stress.
Heat flux on the positive electrode under different C rates at the end of different cycles. (A) 100 cycles (B) 500 cycles.
Heat flux on the negative electrode under different C rates at the end of different cycles. (A) 100 cycles (B) 500 cycles.
Different parts of heat generation rate in LIB under different C rates. (A) Reversible heat. (B) Irreversible heat.
Variations of temperature (A) and total heat generation rate (B) with time under 1C, 2C and 3C rates.
Capacity loss of the battery at different cycles under 1C, 2C and 3C.

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