Recently,　the　growing　demand　for　a　renewable　and　sustainable　fuel　alternative　is　contingent　on　fuel　cell　technologies.　Even　though　it　is　regarded　as　an　environmentally　sustainable　method　of　generating　fuel　for　immediate　concerns,　it　must　be　enhanced　to　make　it　extraordinarily　affordable,　and　environmentally　sustainable.　Hydrogen　(H-2)　synthesis　by　electrochemical　water　splitting　(ECWS)　is　considered　one　of　the　foremost　potential　prospective　methods　for　renewable　energy　output　and　H-2　society　implementation.　Existing　massive　H-2　output　is　mostly　reliant　on　the　steaming　reformation　of　carbon　fuels　that　yield　CO2　together　with　H-2　and　is　a　finite　resource.　ECWS　is　a　viable,　efficient,　and　contamination-free　method　for　H-2　evolution.　Consequently,　developing　reliable　and　cost-effective　technology　for　ECWS　was　a　top　priority　for　scientists　around　the　globe.　Utilizing　renewable　technologies　to　decrease　total　fuel　utilization　is　crucial　for　H-2　evolution.　Capturing　and　transforming　the　fuel　from　the　ambient　through　various　renewable　solutions　for　water　splitting　(WS)　could　effectively　reduce　the　need　for　additional　electricity.　ECWS　is　among　the　foremost　potential　prospective　methods　for　renewable　energy　output　and　the　achievement　of　a　H-2-based　economy.　For　the　overall　water　splitting　(OWS),　several　transition-metal-based　polyfunctional　metal　catalysts　for　both　cathode　and　anode　have　been　synthesized.　Furthermore,　the　essential　to　the　widespread　adoption　of　such　technology　is　the　development　of　reduced-price,　super　functional　electrocatalysts　to　substitute　those,　depending　on　metals.　Many　metal-premised　electrocatalysts　for　both　the　anode　and　cathode　have　been　designed　for　the　WS　process.　The　attributes　of　H-2　and　oxygen　(O-2)　dynamics　interactions　on　the　electrodes　of　water　electrolysis　cells　and　the　fundamental　techniques　for　evaluating　the　achievement　of　electrocatalysts　are　outlined　in　this　paper.　Special　emphasis　is　paid　to　their　fabrication,　electrocatalytic　performance,　durability,　and　measures　for　enhancing　their　efficiency.　In　addition,　prospective　ideas　on　metal-based　WS　electrocatalysts　based　on　existing　problems　are　presented.　It　is　anticipated　that　this　review　will　offer　a　straight　direction　toward　the　engineering　and　construction　of　novel　polyfunctional　electrocatalysts　encompassing　superior　efficiency　in　a　suitable　WS　technique.