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Nanomaterials 2020, 10, 1407 17 of 26 highly produced the CO intermediate. Moreover, the selectivity that the hybrid material showed toward formate formation was not as high compared to Sn or Bi metals [159,160]. Nanomaterials 2020, 10, x FOR PEER REVIEW 20 of 32 Figure 6. Schematic representation of the preparation of the Pd@TiO /ox-CNHs heterostructure. 2 Figure 6. Schematic representation of the preparation of the Pd@TiO2/ox-CNHs heterostructure. The electrocatalytic properties, characteristics, and performance of CNH-based materials towards The electrocatalytic properties, characteristics, and performance of CNH-based materials water splitting and CO2RR is summarized in Table 3. towards water splitting and CO2RR is summarized in Table 3. Table 3. Electrocatalytic properties, characteristics, and performance of CNH-based materials towards Table 3. Electrocatalytic properties, characteristics, and performance of CNH-based materials water splitting and CO2RR. towards water splitting and CO2RR. Electrocatalyst Reaction/Conditions Reaction Performance Ref. Electrocatalyst Reaction/Conditions ReactionPerformance Ref. CNHs H2 SO4 Onset potential: ~0.53 V vs. RHE Onset potential: −0.016 V vs. RHE MoS2/CNHs PotentiaPloatten10tiamlAatc1m0 m: A0.3c2m0 V: −v0s.2.4R6HVE CNHs HER/LSV in 0.5 M HER/LSV in 0.5 M H2SO4 Onset potential: ~0.53 V vs. RHE [137] [137] [139] [139] [140] [140] [150] [158] [150] CNH/PAMAM-Pt CNH/PAMAM- Pt PDA-Pd/CNHs PDA-Pd/CNHs MoS2 /CNHs Current density at 50 mV: 2.5 mA cm N-CNH-Ni-MOF −1 Tafel slope: 85.3 mV decade HER/LSV in 0.5 M H2SO4 HER/LSV in 0.5 M H2SO4 HER/LSV in 0.5 M H2SO4 HER/LSV in 0.5 M H2SO4 OER/LSV in 1.0 M KOH CO RR/CV in 0.1 M 2 Onset potential: −0.016 V vs. RHE Current density at 50 mV: 2.5 mA cm−2 −2 Tafel slope: 42 mV decade−1 Tafel slope: 42 mV decade−1 Durability: Same HER activity after 500 cycles Durability: Same HER activity after 500 Onset potential: ~−0.01 V vs. RHE Potential at 10 mA cm2: ~−0.12 vs. RHE cycles −1 Tafel slope: 61 mV decade Onset potential: ~−0.01 V vs. RHE Onset potential: ~−0.22 V vs. RHE Potential at 10 mA cm : ~−0.12 vs. RHE Potential at 10 mA cm22: −0.246 V vs. RHE vs. RHE −1 Tafel slope: 61 mV decade Tafel slope: 86 mV decade−1 Onset potential: ~−0.22 V vs. RHE Onset potential: 0.07 V vs. RHE 22 vs. RHE vs. RHE Durability: Same electrocatalytic activity after Tafel slope: 86 mV decade−1 15 h OnseOtnpsoetepnotitaeln: t−ia0l.:005.0V7vVs.vRs.HREHE Pd@TiO2/ox-CNHs N-CNH-Ni-MOF 3. Conclusions phosphate buffer solution Tafel slope: 149 mV decade−1 Potential at 10 mA cm2: 0.320 V vs. RHE OER/LSV in 1.0 M KOH Durability: Same electrocatalytic activity after Ta4f8elhslofpel:e8ct5r.o3lmysVis decade−1 There has been tremendous progress in recent yearOs ntsoewt paordtesntihale: −e0x.0p5loVravtsi.oRnHoEf innovating electrocatalystsforenergy-relatedapplicationsandparticularly,infuelcells.Inthis−c1ontext,CNHs Pd@TiO2/ox- CO2RR/CV in 0.1 M phosphate Tafel slope: 149 mV decade CNHs buffer solution Durability: Same electrocatalytic activity from their unconventional structure. The fact that their production is economical and can be done on a have their own state of play as novel electrocatalysts, since they possess intriguing properties deriving large scale renders them advantageous materials that can be utilized in energy-related applications, while in many cases, they are chosen over carbon nanotubes and even graphene. Although CNHs There has been tremendous progress in recent years towards the exploration of innovating electrocatalysts for energy-related applications and particularly, in fuel cells. In this context, CNHs have their own state of play as novel electrocatalysts, since they possess intriguing properties deriving from their unconventional structure. The fact that their production is economical and can be 3. Conclusions have been in the spotlight for quite some time, this interesting nanomaterial is kind of mistreated Durability: Same electrocatalytic activity after 15 h after 48 h of electrolysis [158]PDF Image | Carbon Nanohorn-Based Electrocatalysts for Energy Conversion
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